diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-15 11:12:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-15 11:12:21 -0800 |
| commit | 8fa590bf344816c925810331eea8387627bbeb40 (patch) | |
| tree | 86f3fe04b175e172ef2cd9089ba1b8a0f71434f1 | |
| parent | 057b40f43ce429a02e793adf3cfbf2446a19a38e (diff) | |
| parent | 549a715b98a13c6d05452be3ad37e980087bb081 (diff) | |
| download | linux-8fa590bf344816c925810331eea8387627bbeb40.tar.gz linux-8fa590bf344816c925810331eea8387627bbeb40.tar.bz2 linux-8fa590bf344816c925810331eea8387627bbeb40.zip | |
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm updates from Paolo Bonzini:
"ARM64:
- Enable the per-vcpu dirty-ring tracking mechanism, together with an
option to keep the good old dirty log around for pages that are
dirtied by something other than a vcpu.
- Switch to the relaxed parallel fault handling, using RCU to delay
page table reclaim and giving better performance under load.
- Relax the MTE ABI, allowing a VMM to use the MAP_SHARED mapping
option, which multi-process VMMs such as crosvm rely on (see merge
commit 382b5b87a97d: "Fix a number of issues with MTE, such as
races on the tags being initialised vs the PG_mte_tagged flag as
well as the lack of support for VM_SHARED when KVM is involved.
Patches from Catalin Marinas and Peter Collingbourne").
- Merge the pKVM shadow vcpu state tracking that allows the
hypervisor to have its own view of a vcpu, keeping that state
private.
- Add support for the PMUv3p5 architecture revision, bringing support
for 64bit counters on systems that support it, and fix the
no-quite-compliant CHAIN-ed counter support for the machines that
actually exist out there.
- Fix a handful of minor issues around 52bit VA/PA support (64kB
pages only) as a prefix of the oncoming support for 4kB and 16kB
pages.
- Pick a small set of documentation and spelling fixes, because no
good merge window would be complete without those.
s390:
- Second batch of the lazy destroy patches
- First batch of KVM changes for kernel virtual != physical address
support
- Removal of a unused function
x86:
- Allow compiling out SMM support
- Cleanup and documentation of SMM state save area format
- Preserve interrupt shadow in SMM state save area
- Respond to generic signals during slow page faults
- Fixes and optimizations for the non-executable huge page errata
fix.
- Reprogram all performance counters on PMU filter change
- Cleanups to Hyper-V emulation and tests
- Process Hyper-V TLB flushes from a nested guest (i.e. from a L2
guest running on top of a L1 Hyper-V hypervisor)
- Advertise several new Intel features
- x86 Xen-for-KVM:
- Allow the Xen runstate information to cross a page boundary
- Allow XEN_RUNSTATE_UPDATE flag behaviour to be configured
- Add support for 32-bit guests in SCHEDOP_poll
- Notable x86 fixes and cleanups:
- One-off fixes for various emulation flows (SGX, VMXON, NRIPS=0).
- Reinstate IBPB on emulated VM-Exit that was incorrectly dropped
a few years back when eliminating unnecessary barriers when
switching between vmcs01 and vmcs02.
- Clean up vmread_error_trampoline() to make it more obvious that
params must be passed on the stack, even for x86-64.
- Let userspace set all supported bits in MSR_IA32_FEAT_CTL
irrespective of the current guest CPUID.
- Fudge around a race with TSC refinement that results in KVM
incorrectly thinking a guest needs TSC scaling when running on a
CPU with a constant TSC, but no hardware-enumerated TSC
frequency.
- Advertise (on AMD) that the SMM_CTL MSR is not supported
- Remove unnecessary exports
Generic:
- Support for responding to signals during page faults; introduces
new FOLL_INTERRUPTIBLE flag that was reviewed by mm folks
Selftests:
- Fix an inverted check in the access tracking perf test, and restore
support for asserting that there aren't too many idle pages when
running on bare metal.
- Fix build errors that occur in certain setups (unsure exactly what
is unique about the problematic setup) due to glibc overriding
static_assert() to a variant that requires a custom message.
- Introduce actual atomics for clear/set_bit() in selftests
- Add support for pinning vCPUs in dirty_log_perf_test.
- Rename the so called "perf_util" framework to "memstress".
- Add a lightweight psuedo RNG for guest use, and use it to randomize
the access pattern and write vs. read percentage in the memstress
tests.
- Add a common ucall implementation; code dedup and pre-work for
running SEV (and beyond) guests in selftests.
- Provide a common constructor and arch hook, which will eventually
be used by x86 to automatically select the right hypercall (AMD vs.
Intel).
- A bunch of added/enabled/fixed selftests for ARM64, covering
memslots, breakpoints, stage-2 faults and access tracking.
- x86-specific selftest changes:
- Clean up x86's page table management.
- Clean up and enhance the "smaller maxphyaddr" test, and add a
related test to cover generic emulation failure.
- Clean up the nEPT support checks.
- Add X86_PROPERTY_* framework to retrieve multi-bit CPUID values.
- Fix an ordering issue in the AMX test introduced by recent
conversions to use kvm_cpu_has(), and harden the code to guard
against similar bugs in the future. Anything that tiggers
caching of KVM's supported CPUID, kvm_cpu_has() in this case,
effectively hides opt-in XSAVE features if the caching occurs
before the test opts in via prctl().
Documentation:
- Remove deleted ioctls from documentation
- Clean up the docs for the x86 MSR filter.
- Various fixes"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (361 commits)
KVM: x86: Add proper ReST tables for userspace MSR exits/flags
KVM: selftests: Allocate ucall pool from MEM_REGION_DATA
KVM: arm64: selftests: Align VA space allocator with TTBR0
KVM: arm64: Fix benign bug with incorrect use of VA_BITS
KVM: arm64: PMU: Fix period computation for 64bit counters with 32bit overflow
KVM: x86: Advertise that the SMM_CTL MSR is not supported
KVM: x86: remove unnecessary exports
KVM: selftests: Fix spelling mistake "probabalistic" -> "probabilistic"
tools: KVM: selftests: Convert clear/set_bit() to actual atomics
tools: Drop "atomic_" prefix from atomic test_and_set_bit()
tools: Drop conflicting non-atomic test_and_{clear,set}_bit() helpers
KVM: selftests: Use non-atomic clear/set bit helpers in KVM tests
perf tools: Use dedicated non-atomic clear/set bit helpers
tools: Take @bit as an "unsigned long" in {clear,set}_bit() helpers
KVM: arm64: selftests: Enable single-step without a "full" ucall()
KVM: x86: fix APICv/x2AVIC disabled when vm reboot by itself
KVM: Remove stale comment about KVM_REQ_UNHALT
KVM: Add missing arch for KVM_CREATE_DEVICE and KVM_{SET,GET}_DEVICE_ATTR
KVM: Reference to kvm_userspace_memory_region in doc and comments
KVM: Delete all references to removed KVM_SET_MEMORY_ALIAS ioctl
...
257 files changed, 12068 insertions, 4988 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 896914e3a847..0dd5d8733dd5 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -272,18 +272,6 @@ the VCPU file descriptor can be mmap-ed, including: KVM_CAP_DIRTY_LOG_RING, see section 8.3. -4.6 KVM_SET_MEMORY_REGION -------------------------- - -:Capability: basic -:Architectures: all -:Type: vm ioctl -:Parameters: struct kvm_memory_region (in) -:Returns: 0 on success, -1 on error - -This ioctl is obsolete and has been removed. - - 4.7 KVM_CREATE_VCPU ------------------- @@ -368,17 +356,6 @@ see the description of the capability. Note that the Xen shared info page, if configured, shall always be assumed to be dirty. KVM will not explicitly mark it such. -4.9 KVM_SET_MEMORY_ALIAS ------------------------- - -:Capability: basic -:Architectures: x86 -:Type: vm ioctl -:Parameters: struct kvm_memory_alias (in) -:Returns: 0 (success), -1 (error) - -This ioctl is obsolete and has been removed. - 4.10 KVM_RUN ------------ @@ -1332,7 +1309,7 @@ yet and must be cleared on entry. __u64 userspace_addr; /* start of the userspace allocated memory */ }; - /* for kvm_memory_region::flags */ + /* for kvm_userspace_memory_region::flags */ #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) #define KVM_MEM_READONLY (1UL << 1) @@ -1377,10 +1354,6 @@ the memory region are automatically reflected into the guest. For example, an mmap() that affects the region will be made visible immediately. Another example is madvise(MADV_DROP). -It is recommended to use this API instead of the KVM_SET_MEMORY_REGION ioctl. -The KVM_SET_MEMORY_REGION does not allow fine grained control over memory -allocation and is deprecated. - 4.36 KVM_SET_TSS_ADDR --------------------- @@ -3293,6 +3266,7 @@ valid entries found. ---------------------- :Capability: KVM_CAP_DEVICE_CTRL +:Architectures: all :Type: vm ioctl :Parameters: struct kvm_create_device (in/out) :Returns: 0 on success, -1 on error @@ -3333,6 +3307,7 @@ number. :Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, KVM_CAP_VCPU_ATTRIBUTES for vcpu device KVM_CAP_SYS_ATTRIBUTES for system (/dev/kvm) device (no set) +:Architectures: x86, arm64, s390 :Type: device ioctl, vm ioctl, vcpu ioctl :Parameters: struct kvm_device_attr :Returns: 0 on success, -1 on error @@ -4104,80 +4079,71 @@ flags values for ``struct kvm_msr_filter_range``: ``KVM_MSR_FILTER_READ`` Filter read accesses to MSRs using the given bitmap. A 0 in the bitmap - indicates that a read should immediately fail, while a 1 indicates that - a read for a particular MSR should be handled regardless of the default + indicates that read accesses should be denied, while a 1 indicates that + a read for a particular MSR should be allowed regardless of the default filter action. ``KVM_MSR_FILTER_WRITE`` Filter write accesses to MSRs using the given bitmap. A 0 in the bitmap - indicates that a write should immediately fail, while a 1 indicates that - a write for a particular MSR should be handled regardless of the default + indicates that write accesses should be denied, while a 1 indicates that + a write for a particular MSR should be allowed regardless of the default filter action. -``KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE`` - - Filter both read and write accesses to MSRs using the given bitmap. A 0 - in the bitmap indicates that both reads and writes should immediately fail, - while a 1 indicates that reads and writes for a particular MSR are not - filtered by this range. - flags values for ``struct kvm_msr_filter``: ``KVM_MSR_FILTER_DEFAULT_ALLOW`` If no filter range matches an MSR index that is getting accessed, KVM will - fall back to allowing access to the MSR. + allow accesses to all MSRs by default. ``KVM_MSR_FILTER_DEFAULT_DENY`` If no filter range matches an MSR index that is getting accessed, KVM will - fall back to rejecting access to the MSR. In this mode, all MSRs that should - be processed by KVM need to explicitly be marked as allowed in the bitmaps. + deny accesses to all MSRs by default. + +This ioctl allows userspace to define up to 16 bitmaps of MSR ranges to deny +guest MSR accesses that would normally be allowed by KVM. If an MSR is not +covered by a specific range, the "default" filtering behavior applies. Each +bitmap range covers MSRs from [base .. base+nmsrs). -This ioctl allows user space to define up to 16 bitmaps of MSR ranges to -specify whether a certain MSR access should be explicitly filtered for or not. +If an MSR access is denied by userspace, the resulting KVM behavior depends on +whether or not KVM_CAP_X86_USER_SPACE_MSR's KVM_MSR_EXIT_REASON_FILTER is +enabled. If KVM_MSR_EXIT_REASON_FILTER is enabled, KVM will exit to userspace +on denied accesses, i.e. userspace effectively intercepts the MSR access. If +KVM_MSR_EXIT_REASON_FILTER is not enabled, KVM will inject a #GP into the guest +on denied accesses. -If this ioctl has never been invoked, MSR accesses are not guarded and the -default KVM in-kernel emulation behavior is fully preserved. +If an MSR access is allowed by userspace, KVM will emulate and/or virtualize +the access in accordance with the vCPU model. Note, KVM may still ultimately +inject a #GP if an access is allowed by userspace, e.g. if KVM doesn't support +the MSR, or to follow architectural behavior for the MSR. + +By default, KVM operates in KVM_MSR_FILTER_DEFAULT_ALLOW mode with no MSR range +filters. Calling this ioctl with an empty set of ranges (all nmsrs == 0) disables MSR filtering. In that mode, ``KVM_MSR_FILTER_DEFAULT_DENY`` is invalid and causes an error. -As soon as the filtering is in place, every MSR access is processed through -the filtering except for accesses to the x2APIC MSRs (from 0x800 to 0x8ff); -x2APIC MSRs are always allowed, independent of the ``default_allow`` setting, -and their behavior depends on the ``X2APIC_ENABLE`` bit of the APIC base -register. - .. warning:: - MSR accesses coming from nested vmentry/vmexit are not filtered. + MSR accesses as part of nested VM-Enter/VM-Exit are not filtered. This includes both writes to individual VMCS fields and reads/writes through the MSR lists pointed to by the VMCS. -If a bit is within one of the defined ranges, read and write accesses are -guarded by the bitmap's value for the MSR index if the kind of access -is included in the ``struct kvm_msr_filter_range`` flags. If no range -cover this particular access, the behavior is determined by the flags -field in the kvm_msr_filter struct: ``KVM_MSR_FILTER_DEFAULT_ALLOW`` -and ``KVM_MSR_FILTER_DEFAULT_DENY``. - -Each bitmap range specifies a range of MSRs to potentially allow access on. -The range goes from MSR index [base .. base+nmsrs]. The flags field -indicates whether reads, writes or both reads and writes are filtered -by setting a 1 bit in the bitmap for the corresponding MSR index. - -If an MSR access is not permitted through the filtering, it generates a -#GP inside the guest. When combined with KVM_CAP_X86_USER_SPACE_MSR, that -allows user space to deflect and potentially handle various MSR accesses -into user space. + x2APIC MSR accesses cannot be filtered (KVM silently ignores filters that + cover any x2APIC MSRs). Note, invoking this ioctl while a vCPU is running is inherently racy. However, KVM does guarantee that vCPUs will see either the previous filter or the new filter, e.g. MSRs with identical settings in both the old and new filter will have deterministic behavior. +Similarly, if userspace wishes to intercept on denied accesses, +KVM_MSR_EXIT_REASON_FILTER must be enabled before activating any filters, and +left enabled until after all filters are deactivated. Failure to do so may +result in KVM injecting a #GP instead of exiting to userspace. + 4.98 KVM_CREATE_SPAPR_TCE_64 ---------------------------- @@ -5163,10 +5129,13 @@ KVM_PV_ENABLE ===== ============================= KVM_PV_DISABLE - Deregister the VM from the Ultravisor and reclaim the memory that - had been donated to the Ultravisor, making it usable by the kernel - again. All registered VCPUs are converted back to non-protected - ones. + Deregister the VM from the Ultravisor and reclaim the memory that had + been donated to the Ultravisor, making it usable by the kernel again. + All registered VCPUs are converted back to non-protected ones. If a + previous protected VM had been prepared for asynchonous teardown with + KVM_PV_ASYNC_CLEANUP_PREPARE and not subsequently torn down with + KVM_PV_ASYNC_CLEANUP_PERFORM, it will be torn down in this call + together with the current protected VM. KVM_PV_VM_SET_SEC_PARMS Pass the image header from VM memory to the Ultravisor in @@ -5289,6 +5258,36 @@ KVM_PV_DUMP authentication tag all of which are needed to decrypt the dump at a later time. +KVM_PV_ASYNC_CLEANUP_PREPARE + :Capability: KVM_CAP_S390_PROTECTED_ASYNC_DISABLE + + Prepare the current protected VM for asynchronous teardown. Most + resources used by the current protected VM will be set aside for a + subsequent asynchronous teardown. The current protected VM will then + resume execution immediately as non-protected. There can be at most + one protected VM prepared for asynchronous teardown at any time. If + a protected VM had already been prepared for teardown without + subsequently calling KVM_PV_ASYNC_CLEANUP_PERFORM, this call will + fail. In that case, the userspace process should issue a normal + KVM_PV_DISABLE. The resources set aside with this call will need to + be cleaned up with a subsequent call to KVM_PV_ASYNC_CLEANUP_PERFORM + or KVM_PV_DISABLE, otherwise they will be cleaned up when KVM + terminates. KVM_PV_ASYNC_CLEANUP_PREPARE can be called again as soon + as cleanup starts, i.e. before KVM_PV_ASYNC_CLEANUP_PERFORM finishes. + +KVM_PV_ASYNC_CLEANUP_PERFORM + :Capability: KVM_CAP_S390_PROTECTED_ASYNC_DISABLE + + Tear down the protected VM previously prepared for teardown with + KVM_PV_ASYNC_CLEANUP_PREPARE. The resources that had been set aside + will be freed during the execution of this command. This PV command + should ideally be issued by userspace from a separate thread. If a + fatal signal is received (or the process terminates naturally), the + command will terminate immediately without completing, and the normal + KVM shutdown procedure will take care of cleaning up all remaining + protected VMs, including the ones whose teardown was interrupted by + process termination. + 4.126 KVM_XEN_HVM_SET_ATTR -------------------------- @@ -5306,6 +5305,7 @@ KVM_PV_DUMP union { __u8 long_mode; __u8 vector; + __u8 runstate_update_flag; struct { __u64 gfn; } shared_info; @@ -5383,6 +5383,14 @@ KVM_XEN_ATTR_TYPE_XEN_VERSION event channel delivery, so responding within the kernel without exiting to userspace is beneficial. +KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG + This attribute is available when the KVM_CAP_XEN_HVM ioctl indicates + support for KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG. It enables the + XEN_RUNSTATE_UPDATE flag which allows guest vCPUs to safely read + other vCPUs' vcpu_runstate_info. Xen guests enable this feature via + the VM_ASST_TYPE_runstate_update_flag of the HYPERVISOR_vm_assist + hypercall. + 4.127 KVM_XEN_HVM_GET_ATTR -------------------------- @@ -6440,31 +6448,35 @@ if it decides to decode and emulate the instruction. Used on x86 systems. When the VM capability KVM_CAP_X86_USER_SPACE_MSR is enabled, MSR accesses to registers that would invoke a #GP by KVM kernel code -will instead trigger a KVM_EXIT_X86_RDMSR exit for reads and KVM_EXIT_X86_WRMSR +may instead trigger a KVM_EXIT_X86_RDMSR exit for reads and KVM_EXIT_X86_WRMSR exit for writes. -The "reason" field specifies why the MSR trap occurred. User space will only -receive MSR exit traps when a particular reason was requested during through +The "reason" field specifies why the MSR interception occurred. Userspace will +only receive MSR exits when a particular reason was requested during through ENABLE_CAP. Currently valid exit reasons are: - KVM_MSR_EXIT_REASON_UNKNOWN - access to MSR that is unknown to KVM - KVM_MSR_EXIT_REASON_INVAL - access to invalid MSRs or reserved bits - KVM_MSR_EXIT_REASON_FILTER - access blocked by KVM_X86_SET_MSR_FILTER +============================ ======================================== + KVM_MSR_EXIT_REASON_UNKNOWN access to MSR that is unknown to KVM + KVM_MSR_EXIT_REASON_INVAL access to invalid MSRs or reserved bits + KVM_MSR_EXIT_REASON_FILTER access blocked by KVM_X86_SET_MSR_FILTER +============================ ======================================== -For KVM_EXIT_X86_RDMSR, the "index" field tells user space which MSR the guest -wants to read. To respond to this request with a successful read, user space +For KVM_EXIT_X86_RDMSR, the "index" field tells userspace which MSR the guest +wants to read. To respond to this request with a successful read, userspace writes the respective data into the "data" field and must continue guest execution to ensure the read data is transferred into guest register state. -If the RDMSR request was unsuccessful, user space indicates that with a "1" in +If the RDMSR request was unsuccessful, userspace indicates that with a "1" in the "error" field. This will inject a #GP into the guest when the VCPU is executed again. -For KVM_EXIT_X86_WRMSR, the "index" field tells user space which MSR the guest -wants to write. Once finished processing the event, user space must continue -vCPU execution. If the MSR write was unsuccessful, user space also sets the +For KVM_EXIT_X86_WRMSR, the "index" field tells userspace which MSR the guest +wants to write. Once finished processing the event, userspace must continue +vCPU execution. If the MSR write was unsuccessful, userspace also sets the "error" field to "1". +See KVM_X86_SET_MSR_FILTER for details on the interaction with MSR filtering. + :: @@ -7229,19 +7241,29 @@ polling. :Parameters: args[0] contains the mask of KVM_MSR_EXIT_REASON_* events to report :Returns: 0 on success; -1 on error -This capability enables trapping of #GP invoking RDMSR and WRMSR instructions -into user space. +This capability allows userspace to intercept RDMSR and WRMSR instructions if +access to an MSR is denied. By default, KVM injects #GP on denied accesses. When a guest requests to read or write an MSR, KVM may not implement all MSRs that are relevant to a respective system. It also does not differentiate by CPU type. -To allow more fine grained control over MSR handling, user space may enable +To allow more fine grained control over MSR handling, userspace may enable this capability. With it enabled, MSR accesses that match the mask specified in -args[0] and trigger a #GP event inside the guest by KVM will instead trigger -KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR exit notifications which user space -can then handle to implement model specific MSR handling and/or user notifications -to inform a user that an MSR was not handled. +args[0] and would trigger a #GP inside the guest will instead trigger +KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR exit notifications. Userspace +can then implement model specific MSR handling and/or user notifications +to inform a user that an MSR was not emulated/virtualized by KVM. + +The valid mask flags are: + +============================ =============================================== + KVM_MSR_EXIT_REASON_UNKNOWN intercept accesses to unknown (to KVM) MSRs + KVM_MSR_EXIT_REASON_INVAL intercept accesses that are architecturally + invalid according to the vCPU model and/or mode + KVM_MSR_EXIT_REASON_FILTER intercept accesses that are denied by userspace + via KVM_X86_SET_MSR_FILTER +============================ =============================================== 7.22 KVM_CAP_X86_BUS_LOCK_EXIT ------------------------------- @@ -7384,8 +7406,9 @@ hibernation of the host; however the VMM needs to manually save/restore the tags as appropriate if the VM is migrated. When this capability is enabled all memory in memslots must be mapped as -not-shareable (no MAP_SHARED), attempts to create a memslot with a -MAP_SHARED mmap will result in an -EINVAL return. +``MAP_ANONYMOUS`` or with a RAM-based file mapping (``tmpfs``, ``memfd``), +attempts to create a memslot with an invalid mmap will result in an +-EINVAL return. When enabled the VMM may make use of the ``KVM_ARM_MTE_COPY_TAGS`` ioctl to perform a bulk copy of tags to/from the guest. @@ -7901,7 +7924,7 @@ KVM_EXIT_X86_WRMSR exit notifications. This capability indicates that KVM supports that accesses to user defined MSRs may be rejected. With this capability exposed, KVM exports new VM ioctl KVM_X86_SET_MSR_FILTER which user space can call to specify bitmaps of MSR -ranges that KVM should reject access to. +ranges that KVM should deny access to. In combination with KVM_CAP_X86_USER_SPACE_MSR, this allows user space to trap and emulate MSRs that are outside of the scope of KVM as well as @@ -7920,7 +7943,7 @@ regardless of what has actually been exposed through the CPUID leaf. 8.29 KVM_CAP_DIRTY_LOG_RING/KVM_CAP_DIRTY_LOG_RING_ACQ_REL ---------------------------------------------------------- -:Architectures: x86 +:Architectures: x86, arm64 :Parameters: args[0] - size of the dirty log ring KVM is capable of tracking dirty memory using ring buffers that are @@ -8002,13 +8025,6 @@ flushing is done by the KVM_GET_DIRTY_LOG ioctl). To achieve that, one needs to kick the vcpu out of KVM_RUN using a signal. The resulting vmexit ensures that all dirty GFNs are flushed to the dirty rings. -NOTE: the capability KVM_CAP_DIRTY_LOG_RING and the corresponding -ioctl KVM_RESET_DIRTY_RINGS are mutual exclusive to the existing ioctls -KVM_GET_DIRTY_LOG and KVM_CLEAR_DIRTY_LOG. After enabling -KVM_CAP_DIRTY_LOG_RING with an acceptable dirty ring size, the virtual -machine will switch to ring-buffer dirty page tracking and further -KVM_GET_DIRTY_LOG or KVM_CLEAR_DIRTY_LOG ioctls will fail. - NOTE: KVM_CAP_DIRTY_LOG_RING_ACQ_REL is the only capability that should be exposed by weakly ordered architecture, in order to indicate the additional memory ordering requirements imposed on userspace when @@ -8017,6 +8033,33 @@ Architecture with TSO-like ordering (such as x86) are allowed to expose both KVM_CAP_DIRTY_LOG_RING and KVM_CAP_DIRTY_LOG_RING_ACQ_REL to userspace. +After enabling the dirty rings, the userspace needs to detect the +capability of KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP to see whether the +ring structures can be backed by per-slot bitmaps. With this capability +advertised, it means the architecture can dirty guest pages without +vcpu/ring context, so that some of the dirty information will still be +maintained in the bitmap structure. KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP +can't be enabled if the capability of KVM_CAP_DIRTY_LOG_RING_ACQ_REL +hasn't been enabled, or any memslot has been existing. + +Note that the bitmap here is only a backup of the ring structure. The +use of the ring and bitmap combination is only beneficial if there is +only a very small amount of memory that is dirtied out of vcpu/ring +context. Otherwise, the stand-alone per-slot bitmap mechanism needs to +be considered. + +To collect dirty bits in the backup bitmap, userspace can use the same +KVM_GET_DIRTY_LOG ioctl. KVM_CLEAR_DIRTY_LOG isn't needed as long as all +the generation of the dirty bits is done in a single pass. Collecting +the dirty bitmap should be the very last thing that the VMM does before +considering the state as complete. VMM needs to ensure that the dirty +state is final and avoid missing dirty pages from another ioctl ordered +after the bitmap collection. + +NOTE: One example of using the backup bitmap is saving arm64 vgic/its +tables through KVM_DEV_ARM_{VGIC_GRP_CTRL, ITS_SAVE_TABLES} command on +KVM device "kvm-arm-vgic-its" when dirty ring is enabled. + 8.30 KVM_CAP_XEN_HVM -------------------- @@ -8025,12 +8068,13 @@ to userspace. This capability indicates the features that Xen supports for hosting Xen PVHVM guests. Valid flags are:: - #define KVM_XEN_HVM_CONFIG_HYPERCALL_MSR (1 << 0) - #define KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL (1 << 1) - #define KVM_XEN_HVM_CONFIG_SHARED_INFO (1 << 2) - #define KVM_XEN_HVM_CONFIG_RUNSTATE (1 << 3) - #define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4) - #define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5) + #define KVM_XEN_HVM_CONFIG_HYPERCALL_MSR (1 << 0) + #define KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL (1 << 1) + #define KVM_XEN_HVM_CONFIG_SHARED_INFO (1 << 2) + #define KVM_XEN_HVM_CONFIG_RUNSTATE (1 << 3) + #define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4) + #define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5) + #define KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG (1 << 6) The KVM_XEN_HVM_CONFIG_HYPERCALL_MSR flag indicates that the KVM_XEN_HVM_CONFIG ioctl is available, for the guest to set its hypercall page. @@ -8062,6 +8106,18 @@ KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID/TIMER/UPCALL_VECTOR vCPU attributes. related to event channel delivery, timers, and the XENVER_version interception. +The KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG flag indicates that KVM supports +the KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG attribute in the KVM_XEN_SET_ATTR +and KVM_XEN_GET_ATTR ioctls. This controls whether KVM will set the +XEN_RUNSTATE_UPDATE flag in guest memory mapped vcpu_runstate_info during +updates of the runstate information. Note that versions of KVM which support +the RUNSTATE feature above, but not thie RUNSTATE_UPDATE_FLAG feature, will +always set the XEN_RUNSTATE_UPDATE flag when updating the guest structure, +which is perhaps counterintuitive. When this flag is advertised, KVM will +behave more correctly, not using the XEN_RUNSTATE_UPDATE flag until/unless +specifically enabled (by the guest making the hypercall, causing the VMM +to enable the KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG attribute). + 8.31 KVM_CAP_PPC_MULTITCE ------------------------- diff --git a/Documentation/virt/kvm/arm/pvtime.rst b/Documentation/virt/kvm/arm/pvtime.rst index 392521af7c90..e88b34e586be 100644 --- a/Documentation/virt/kvm/arm/pvtime.rst +++ b/Documentation/virt/kvm/arm/pvtime.rst @@ -23,21 +23,23 @@ the PV_TIME_FEATURES hypercall should be probed using the SMCCC 1.1 ARCH_FEATURES mechanism before calling it. PV_TIME_FEATURES - ============= ======== ========== + + ============= ======== ================================================= Function ID: (uint32) 0xC5000020 PV_call_id: (uint32) The function to query for support. Currently only PV_TIME_ST is supported. Return value: (int64) NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant PV-time feature is supported by the hypervisor. - ============= ======== ========== + ============= ======== ================================================= PV_TIME_ST - ============= ======== ========== + + ============= ======== ============================================== Function ID: (uint32) 0xC5000021 Return value: (int64) IPA of the stolen time data structure for this VCPU. On failure: NOT_SUPPORTED (-1) - ============= ======== ========== + ============= ======== ============================================== The IPA returned by PV_TIME_ST should be mapped by the guest as normal memory with inner and outer write back caching attributes, in the inner shareable @@ -76,5 +78,5 @@ It is advisable that one or more 64k pages are set aside for the purpose of these structures and not used for other purposes, this enables the guest to map the region using 64k pages and avoids conflicting attributes with other memory. -For the user space interface see Documentation/virt/kvm/devices/vcpu.rst -section "3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL". +For the user space interface see +:ref:`Documentation/virt/kvm/devices/vcpu.rst <kvm_arm_vcpu_pvtime_ctrl>`.
\ No newline at end of file diff --git a/Documentation/virt/kvm/devices/arm-vgic-its.rst b/Documentation/virt/kvm/devices/arm-vgic-its.rst index d257eddbae29..e053124f77c4 100644 --- a/Documentation/virt/kvm/devices/arm-vgic-its.rst +++ b/Documentation/virt/kvm/devices/arm-vgic-its.rst @@ -52,7 +52,10 @@ KVM_DEV_ARM_VGIC_GRP_CTRL KVM_DEV_ARM_ITS_SAVE_TABLES save the ITS table data into guest RAM, at the location provisioned - by the guest in corresponding registers/table entries. + by the guest in corresponding registers/table entries. Should userspace + require a form of dirty tracking to identify which pages are modified + by the saving process, it should use a bitmap even if using another + mechanism to track the memory dirtied by the vCPUs. The layout of the tables in guest memory defines an ABI. The entries are laid out in little endian format as described in the last paragraph. diff --git a/Documentation/virt/kvm/devices/vcpu.rst b/Documentation/virt/kvm/devices/vcpu.rst index 716aa3edae14..31f14ec4a65b 100644 --- a/Documentation/virt/kvm/devices/vcpu.rst +++ b/Documentation/virt/kvm/devices/vcpu.rst @@ -171,6 +171,8 @@ configured values on other VCPUs. Userspace should configure the interrupt numbers on at least one VCPU after creating all VCPUs and before running any VCPUs. +.. _kvm_arm_vcpu_pvtime_ctrl: + 3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL ================================== diff --git a/MAINTAINERS b/MAINTAINERS index b454c20a5c88..096ae475e21c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11438,6 +11438,16 @@ F: arch/x86/kvm/svm/hyperv.* F: arch/x86/kvm/svm/svm_onhyperv.* F: arch/x86/kvm/vmx/evmcs.* +KVM X86 Xen (KVM/Xen) +M: David Woodhouse <dwmw2@infradead.org> +M: Paul Durrant <paul@xen.org> +M: Sean Christopherson <seanjc@google.com> +M: Paolo Bonzini <pbonzini@redhat.com> +L: kvm@vger.kernel.org +S: Supported +T: git git://git.kernel.org/pub/scm/virt/kvm/kvm.git +F: arch/x86/kvm/xen.* + KERNFS M: Greg Kroah-Hartman <gregkh@linuxfoundation.org> M: Tejun Heo <tj@kernel.org> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7cb7d635fbcc..cf6d1cd8b6dc 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1988,6 +1988,7 @@ config ARM64_MTE depends on ARM64_PAN select ARCH_HAS_SUBPAGE_FAULTS select ARCH_USES_HIGH_VMA_FLAGS + select ARCH_USES_PG_ARCH_X help Memory Tagging (part of the ARMv8.5 Extensions) provides architectural support for run-time, always-on detection of diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 8aa8492dafc0..0df3fc3a0173 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -135,7 +135,7 @@ * 40 bits wide (T0SZ = 24). Systems with a PARange smaller than 40 bits are * not known to exist and will break with this configuration. * - * The VTCR_EL2 is configured per VM and is initialised in kvm_arm_setup_stage2(). + * The VTCR_EL2 is configured per VM and is initialised in kvm_init_stage2_mmu. * * Note that when using 4K pages, we concatenate two first level page tables * together. With 16K pages, we concatenate 16 first level page tables. @@ -340,9 +340,13 @@ * We have * PAR [PA_Shift - 1 : 12] = PA [PA_Shift - 1 : 12] * HPFAR [PA_Shift - 9 : 4] = FIPA [PA_Shift - 1 : 12] + * + * Always assume 52 bit PA since at this point, we don't know how many PA bits + * the page table has been set up for. This should be safe since unused address + * bits in PAR are res0. */ #define PAR_TO_HPFAR(par) \ - (((par) & GENMASK_ULL(PHYS_MASK_SHIFT - 1, 12)) >> 8) + (((par) & GENMASK_ULL(52 - 1, 12)) >> 8) #define ECN(x) { ESR_ELx_EC_##x, #x } diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 53035763e48e..43c3bc0f9544 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -76,6 +76,9 @@ enum __kvm_host_smccc_func { __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs, __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs, __KVM_HOST_SMCCC_FUNC___pkvm_vcpu_init_traps, + __KVM_HOST_SMCCC_FUNC___pkvm_init_vm, + __KVM_HOST_SMCCC_FUNC___pkvm_init_vcpu, + __KVM_HOST_SMCCC_FUNC___pkvm_teardown_vm, }; #define DECLARE_KVM_VHE_SYM(sym) extern char sym[] @@ -106,7 +109,7 @@ enum __kvm_host_smccc_func { #define per_cpu_ptr_nvhe_sym(sym, cpu) \ ({ \ unsigned long base, off; \ - base = kvm_arm_hyp_percpu_base[cpu]; \ + base = kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; \ off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ @@ -211,7 +214,7 @@ DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) -extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; +extern unsigned long kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[]; DECLARE_KVM_NVHE_SYM(__per_cpu_start); DECLARE_KVM_NVHE_SYM(__per_cpu_end); diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index fd34ab155d0b..35a159d131b5 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -73,6 +73,63 @@ u32 __attribute_const__ kvm_target_cpu(void); int kvm_reset_vcpu(struct kvm_vcpu *vcpu); void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu); +struct kvm_hyp_memcache { + phys_addr_t head; + unsigned long nr_pages; +}; + +static inline void push_hyp_memcache(struct kvm_hyp_memcache *mc, + phys_addr_t *p, + phys_addr_t (*to_pa)(void *virt)) +{ + *p = mc->head; + mc->head = to_pa(p); + mc->nr_pages++; +} + +static inline void *pop_hyp_memcache(struct kvm_hyp_memcache *mc, + void *(*to_va)(phys_addr_t phys)) +{ + phys_addr_t *p = to_va(mc->head); + + if (!mc->nr_pages) + return NULL; + + mc->head = *p; + mc->nr_pages--; + + return p; +} + +static inline int __topup_hyp_memcache(struct kvm_hyp_memcache *mc, + unsigned long min_pages, + void *(*alloc_fn)(void *arg), + phys_addr_t (*to_pa)(void *virt), + void *arg) +{ + while (mc->nr_pages < min_pages) { + phys_addr_t *p = alloc_fn(arg); + + if (!p) + return -ENOMEM; + push_hyp_memcache(mc, p, to_pa); + } + + return 0; +} + +static inline void __free_hyp_memcache(struct kvm_hyp_memcache *mc, + void (*free_fn)(void *virt, void *arg), + void *(*to_va)(phys_addr_t phys), + void *arg) +{ + while (mc->nr_pages) + free_fn(pop_hyp_memcache(mc, to_va), arg); +} + +void free_hyp_memcache(struct kvm_hyp_memcache *mc); +int topup_hyp_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages); + struct kvm_vmid { atomic64_t id; }; @@ -115,6 +172,13 @@ struct kvm_smccc_features { unsigned long vendor_hyp_bmap; }; +typedef unsigned int pkvm_handle_t; + +struct kvm_protected_vm { + pkvm_handle_t handle; + struct kvm_hyp_memcache teardown_mc; +}; + struct kvm_arch { struct kvm_s2_mmu mmu; @@ -163,9 +227,19 @@ struct kvm_arch { u8 pfr0_csv2; u8 pfr0_csv3; + struct { + u8 imp:4; + u8 unimp:4; + } dfr0_pmuver; /* Hypercall features firmware registers' descriptor */ struct kvm_smccc_features smccc_feat; + + /* + * For an untrusted host VM, 'pkvm.handle' is used to lookup + * the associated pKVM instance in the hypervisor. + */ + struct kvm_protected_vm pkvm; }; struct kvm_vcpu_fault_info { @@ -925,8 +999,6 @@ int kvm_set_ipa_limit(void); #define __KVM_HAVE_ARCH_VM_ALLOC struct kvm *kvm_arch_alloc_vm(void); -int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type); - static inline bool kvm_vm_is_protected(struct kvm *kvm) { return false; diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h index aa7fa2a08f06..6797eafe7890 100644 --- a/arch/arm64/include/asm/kvm_hyp.h +++ b/arch/arm64/include/asm/kvm_hyp.h @@ -123,4 +123,7 @@ extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val); extern u64 kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val); +extern unsigned long kvm_nvhe_sym(__icache_flags); +extern unsigned int kvm_nvhe_sym(kvm_arm_vmid_bits); + #endif /* __ARM64_KVM_HYP_H__ */ diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index 7784081088e7..e4a7e6369499 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -166,7 +166,7 @@ int create_hyp_exec_mappings(phys_addr_t phys_addr, size_t size, void free_hyp_pgds(void); void stage2_unmap_vm(struct kvm *kvm); -int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu); +int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu, unsigned long type); void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu); int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, phys_addr_t pa, unsigned long size, bool writable); diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index 3252eb50ecfe..63f81b27a4e3 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -42,6 +42,8 @@ typedef u64 kvm_pte_t; #define KVM_PTE_ADDR_MASK GENMASK(47, PAGE_SHIFT) #define KVM_PTE_ADDR_51_48 GENMASK(15, 12) +#define KVM_PHYS_INVALID (-1ULL) + static inline bool kvm_pte_valid(kvm_pte_t pte) { return pte & KVM_PTE_VALID; @@ -57,6 +59,18 @@ static inline u64 kvm_pte_to_phys(kvm_pte_t pte) return pa; } +static inline kvm_pte_t kvm_phys_to_pte(u64 pa) +{ + kvm_pte_t pte = pa & KVM_PTE_ADDR_MASK; + + if (PAGE_SHIFT == 16) { + pa &= GENMASK(51, 48); + pte |= FIELD_PREP(KVM_PTE_ADDR_51_48, pa >> 48); + } + + return pte; +} + static inline u64 kvm_granule_shift(u32 level) { /* Assumes KVM_PGTABLE_MAX_LEVELS is 4 */ @@ -85,6 +99,8 @@ static inline bool kvm_level_supports_block_mapping(u32 level) * allocation is physically contiguous. * @free_pages_exact: Free an exact number of memory pages previously * allocated by zalloc_pages_exact. + * @free_removed_table: Free a removed paging structure by unlinking and + * dropping references. * @get_page: Increment the refcount on a page. * @put_page: Decrement the refcount on a page. When the * refcount reaches 0 the page is automatically @@ -103,6 +119,7 @@ struct kvm_pgtable_mm_ops { void* (*zalloc_page)(void *arg); void* (*zalloc_pages_exact)(size_t size); void (*free_pages_exact)(void *addr, size_t size); + void (*free_removed_table)(void *addr, u32 level); void (*get_page)(void *addr); void (*put_page)(void *addr); int (*page_count)(void *addr); @@ -162,29 +179,6 @@ typedef bool (*kvm_pgtable_force_pte_cb_t)(u64 addr, u64 end, enum kvm_pgtable_prot prot); /** - * struct kvm_pgtable - KVM page-table. - * @ia_bits: Maximum input address size, in bits. - * @start_level: Level at which the page-table walk starts. - * @pgd: Pointer to the first top-level entry of the page-table. - * @mm_ops: Memory management callbacks. - * @mmu: Stage-2 KVM MMU struct. Unused for stage-1 page-tables. - * @flags: Stage-2 page-table flags. - * @force_pte_cb: Function that returns true if page level mappings must - * be used instead of block mappings. - */ -struct kvm_pgtable { - u32 ia_bits; - u32 start_level; - kvm_pte_t *pgd; - struct kvm_pgtable_mm_ops *mm_ops; - - /* Stage-2 only */ - struct kvm_s2_mmu *mmu; - enum kvm_pgtable_stage2_flags flags; - kvm_pgtable_force_pte_cb_t force_pte_cb; -}; - -/** * enum kvm_pgtable_walk_flags - Flags to control a depth-first page-table walk. * @KVM_PGTABLE_WALK_LEAF: Visit leaf entries, including invalid * entries. @@ -192,17 +186,34 @@ struct kvm_pgtable { * children. * @KVM_PGTABLE_WALK_TABLE_POST: Visit table entries after their * children. + * @KVM_PGTABLE_WALK_SHARED: Indicates the page-tables may be shared + * with other software walkers. */ enum kvm_pgtable_walk_flags { KVM_PGTABLE_WALK_LEAF = BIT(0), KVM_PGTABLE_WALK_TABLE_PRE = BIT(1), KVM_PGTABLE_WALK_TABLE_POST = BIT(2), + KVM_PGTABLE_WALK_SHARED = BIT(3), +}; + +struct kvm_pgtable_visit_ctx { + kvm_pte_t *ptep; + kvm_pte_t old; + void *arg; + struct kvm_pgtable_mm_ops *mm_ops; + u64 addr; + u64 end; + u32 level; + enum kvm_pgtable_walk_flags flags; }; -typedef int (*kvm_pgtable_visitor_fn_t)(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg); +typedef int (*kvm_pgtable_visitor_fn_t)(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit); + +static inline bool kvm_pgtable_walk_shared(const struct kvm_pgtable_visit_ctx *ctx) +{ + return ctx->flags & KVM_PGTABLE_WALK_SHARED; +} /** * struct kvm_pgtable_walker - Hook into a page-table walk. @@ -217,6 +228,94 @@ struct kvm_pgtable_walker { const enum kvm_pgtable_walk_flags flags; }; +/* + * RCU cannot be used in a non-kernel context such as the hyp. As such, page + * table walkers used in hyp do not call into RCU and instead use other + * synchronization mechanisms (such as a spinlock). + */ +#if defined(__KVM_NVHE_HYPERVISOR__) || defined(__KVM_VHE_HYPERVISOR__) + +typedef kvm_pte_t *kvm_pteref_t; + +static inline kvm_pte_t *kvm_dereference_pteref(struct kvm_pgtable_walker *walker, + kvm_pteref_t pteref) +{ + return pteref; +} + +static inline int kvm_pgtable_walk_begin(struct kvm_pgtable_walker *walker) +{ + /* + * Due to the lack of RCU (or a similar protection scheme), only + * non-shared table walkers are allowed in the hypervisor. + */ + if (walker->flags & KVM_PGTABLE_WALK_SHARED) + return -EPERM; + + return 0; +} + +static inline void kvm_pgtable_walk_end(struct kvm_pgtable_walker *walker) {} + +static inline bool kvm_pgtable_walk_lock_held(void) +{ + return true; +} + +#else + +typedef kvm_pte_t __rcu *kvm_pteref_t; + +static inline kvm_pte_t *kvm_dereference_pteref(struct kvm_pgtable_walker *walker, + kvm_pteref_t pteref) +{ + return rcu_dereference_check(pteref, !(walker->flags & KVM_PGTABLE_WALK_SHARED)); +} + +static inline int kvm_pgtable_walk_begin(struct kvm_pgtable_walker *walker) +{ + if (walker->flags & KVM_PGTABLE_WALK_SHARED) + rcu_read_lock(); + + return 0; +} + +static inline void kvm_pgtable_walk_end(struct kvm_pgtable_walker *walker) +{ + if (walker->flags & KVM_PGTABLE_WALK_SHARED) + rcu_read_unlock(); +} + +static inline bool kvm_pgtable_walk_lock_held(void) +{ + return rcu_read_lock_held(); +} + +#endif + +/** + * struct kvm_pgtable - KVM page-table. + * @ia_bits: Maximum input address size, in bits. + * @start_level: Level at which the page-table walk starts. + * @pgd: Pointer to the first top-level entry of the page-table. + * @mm_ops: Memory management callbacks. + * @mmu: Stage-2 KVM MMU struct. Unused for stage-1 page-tables. + * @flags: Stage-2 page-table flags. + * @force_pte_cb: Function that returns true if page level mappings must + * be used instead of block mappings. + */ +struct kvm_pgtable { + u32 ia_bits; + u32 start_level; + kvm_pteref_t pgd; + struct kvm_pgtable_mm_ops *mm_ops; + + /* Stage-2 only */ + struct kvm_s2_mmu *mmu; + enum kvm_pgtable_stage2_flags flags; + kvm_pgtable_force_pte_cb_t force_pte_cb; +}; + /** * kvm_pgtable_hyp_init() - Initialise a hypervisor stage-1 page-table. * @pgt: Uninitialised page-table structure to initialise. @@ -297,6 +396,14 @@ u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size); u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift); /** + * kvm_pgtable_stage2_pgd_size() - Helper to compute size of a stage-2 PGD + * @vtcr: Content of the VTCR register. + * + * Return: the size (in bytes) of the stage-2 PGD + */ +size_t kvm_pgtable_stage2_pgd_size(u64 vtcr); + +/** * __kvm_pgtable_stage2_init() - Initialise a guest stage-2 page-table. * @pgt: Uninitialised page-table structure to initialise. * @mmu: S2 MMU context for this S2 translation @@ -325,6 +432,17 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt); /** + * kvm_pgtable_stage2_free_removed() - Free a removed stage-2 paging structure. + * @mm_ops: Memory management callbacks. + * @pgtable: Unlinked stage-2 paging structure to be freed. + * @level: Level of the stage-2 paging structure to be freed. + * + * The page-table is assumed to be unreachable by any hardware walkers prior to + * freeing and therefore no TLB invalidation is performed. + */ +void kvm_pgtable_stage2_free_removed(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level); + +/** * kvm_pgtable_stage2_map() - Install a mapping in a guest stage-2 page-table. * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init*(). * @addr: Intermediate physical address at which to place the mapping. @@ -333,6 +451,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt); * @prot: Permissions and attributes for the mapping. * @mc: Cache of pre-allocated and zeroed memory from which to allocate * page-table pages. + * @flags: Flags to control the page-table walk (ex. a shared walk) * * The offset of @addr within a page is ignored, @size is rounded-up to * the next page boundary and @phys is rounded-down to the previous page @@ -354,7 +473,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt); */ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys, enum kvm_pgtable_prot prot, - void *mc); + void *mc, enum kvm_pgtable_walk_flags flags); /** * kvm_pgtable_stage2_set_owner() - Unmap and annotate pages in the IPA space to diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 9f4ad2a8df59..01129b0d4c68 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -9,11 +9,49 @@ #include <linux/memblock.h> #include <asm/kvm_pgtable.h> +/* Maximum number of VMs that can co-exist under pKVM. */ +#define KVM_MAX_PVMS 255 + #define HYP_MEMBLOCK_REGIONS 128 +int pkvm_init_host_vm(struct kvm *kvm); +int pkvm_create_hyp_vm(struct kvm *kvm); +void pkvm_destroy_hyp_vm(struct kvm *kvm); + extern struct memblock_region kvm_nvhe_sym(hyp_memory)[]; extern unsigned int kvm_nvhe_sym(hyp_memblock_nr); +static inline unsigned long +hyp_vmemmap_memblock_size(struct memblock_region *reg, size_t vmemmap_entry_size) +{ + unsigned long nr_pages = reg->size >> PAGE_SHIFT; + unsigned long start, end; + + start = (reg->base >> PAGE_SHIFT) * vmemmap_entry_size; + end = start + nr_pages * vmemmap_entry_size; + start = ALIGN_DOWN(start, PAGE_SIZE); + end = ALIGN(end, PAGE_SIZE); + + return end - start; +} + +static inline unsigned long hyp_vmemmap_pages(size_t vmemmap_entry_size) +{ + unsigned long res = 0, i; + + for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) { + res += hyp_vmemmap_memblock_size(&kvm_nvhe_sym(hyp_memory)[i], + vmemmap_entry_size); + } + + return res >> PAGE_SHIFT; +} + +static inline unsigned long hyp_vm_table_pages(void) +{ + return PAGE_ALIGN(KVM_MAX_PVMS * sizeof(void *)) >> PAGE_SHIFT; +} + static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages) { unsigned long total = 0, i; diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h index 760c62f8e22f..20dd06d70af5 100644 --- a/arch/arm64/include/asm/mte.h +++ b/arch/arm64/include/asm/mte.h @@ -25,7 +25,7 @@ unsigned long mte_copy_tags_to_user(void __user *to, void *from, unsigned long n); int mte_save_tags(struct page *page); void mte_save_page_tags(const void *page_addr, void *tag_storage); -bool mte_restore_tags(swp_entry_t entry, struct page *page); +void mte_restore_tags(swp_entry_t entry, struct page *page); void mte_restore_page_tags(void *page_addr, const void *tag_storage); void mte_invalidate_tags(int type, pgoff_t offset); void mte_invalidate_tags_area(int type); @@ -36,6 +36,58 @@ void mte_free_tag_storage(char *storage); /* track which pages have valid allocation tags */ #define PG_mte_tagged PG_arch_2 +/* simple lock to avoid multiple threads tagging the same page */ +#define PG_mte_lock PG_arch_3 + +static inline void set_page_mte_tagged(struct page *page) +{ + /* + * Ensure that the tags written prior to this function are visible + * before the page flags update. + */ + smp_wmb(); + set_bit(PG_mte_tagged, &page->flags); +} + +static inline bool page_mte_tagged(struct page *page) +{ + bool ret = test_bit(PG_mte_tagged, &page->flags); + + /* + * If the page is tagged, ensure ordering with a likely subsequent + * read of the tags. + */ + if (ret) + smp_rmb(); + return ret; +} + +/* + * Lock the page for tagging and return 'true' if the page can be tagged, + * 'false' if already tagged. PG_mte_tagged is never cleared and therefore the + * locking only happens once for page initialisation. + * + * The page MTE lock state: + * + * Locked: PG_mte_lock && !PG_mte_tagged + * Unlocked: !PG_mte_lock || PG_mte_tagged + * + * Acquire semantics only if the page is tagged (returning 'false'). + */ +static inline bool try_page_mte_tagging(struct page *page) +{ + if (!test_and_set_bit(PG_mte_lock, &page->flags)) + return true; + + /* + * The tags are either being initialised or may have been initialised + * already. Check if the PG_mte_tagged flag has been set or wait + * otherwise. + */ + smp_cond_load_acquire(&page->flags, VAL & (1UL << PG_mte_tagged)); + + return false; +} void mte_zero_clear_page_tags(void *addr); void mte_sync_tags(pte_t old_pte, pte_t pte); @@ -56,6 +108,17 @@ size_t mte_probe_user_range(const char __user *uaddr, size_t size); /* unused if !CONFIG_ARM64_MTE, silence the compiler */ #define PG_mte_tagged 0 +static inline void set_page_mte_tagged(struct page *page) +{ +} +static inline bool page_mte_tagged(struct page *page) +{ + return false; +} +static inline bool try_page_mte_tagging(struct page *page) +{ + return false; +} static inline void mte_zero_clear_page_tags(void *addr) { } diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index b3faf7582a53..6914add66bcf 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1046,8 +1046,8 @@ static inline void arch_swap_invalidate_area(int type) #define __HAVE_ARCH_SWAP_RESTORE static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio) { - if (system_supports_mte() && mte_restore_tags(entry, &folio->page)) - set_bit(PG_mte_tagged, &folio->flags); + if (system_supports_mte()) + mte_restore_tags(entry, &folio->page); } #endif /* CONFIG_ARM64_MTE */ diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h index 316917b98707..a7a857f1784d 100644 --- a/arch/arm64/include/uapi/asm/kvm.h +++ b/arch/arm64/include/uapi/asm/kvm.h @@ -43,6 +43,7 @@ #define __KVM_HAVE_VCPU_EVENTS #define KVM_COALESCED_MMIO_PAGE_OFFSET 1 +#define KVM_DIRTY_LOG_PAGE_OFFSET 64 #define KVM_REG_SIZE(id) \ (1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT)) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 7e76e1fda2a1..a77315b338e6 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2076,8 +2076,10 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) * Clear the tags in the zero page. This needs to be done via the * linear map which has the Tagged attribute. */ - if (!test_and_set_bit(PG_mte_tagged, &ZERO_PAGE(0)->flags)) + if (try_page_mte_tagging(ZERO_PAGE(0))) { mte_clear_page_tags(lm_alias(empty_zero_page)); + set_page_mte_tagged(ZERO_PAGE(0)); + } kasan_init_hw_tags_cpu(); } diff --git a/arch/arm64/kernel/elfcore.c b/arch/arm64/kernel/elfcore.c index 27ef7ad3ffd2..353009d7f307 100644 --- a/arch/arm64/kernel/elfcore.c +++ b/arch/arm64/kernel/elfcore.c @@ -47,7 +47,7 @@ static int mte_dump_tag_range(struct coredump_params *cprm, * Pages mapped in user space as !pte_access_permitted() (e.g. * PROT_EXEC only) may not have the PG_mte_tagged flag set. */ - if (!test_bit(PG_mte_tagged, &page->flags)) { + if (!page_mte_tagged(page)) { put_page(page); dump_skip(cprm, MTE_PAGE_TAG_STORAGE); continue; diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c index af5df48ba915..788597a6b6a2 100644 --- a/arch/arm64/kernel/hibernate.c +++ b/arch/arm64/kernel/hibernate.c @@ -271,7 +271,7 @@ static int swsusp_mte_save_tags(void) if (!page) continue; - if (!test_bit(PG_mte_tagged, &page->flags)) + if (!page_mte_tagged(page)) continue; ret = save_tags(page, pfn); diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index f31130ba0233..d0e9bb5c91fc 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -63,12 +63,6 @@ KVM_NVHE_ALIAS(nvhe_hyp_panic_handler); /* Vectors installed by hyp-init on reset HVC. */ KVM_NVHE_ALIAS(__hyp_stub_vectors); -/* Kernel symbol used by icache_is_vpipt(). */ -KVM_NVHE_ALIAS(__icache_flags); - -/* VMID bits set by the KVM VMID allocator */ -KVM_NVHE_ALIAS(kvm_arm_vmid_bits); - /* Static keys which are set if a vGIC trap should be handled in hyp. */ KVM_NVHE_ALIAS(vgic_v2_cpuif_trap); KVM_NVHE_ALIAS(vgic_v3_cpuif_trap); @@ -84,9 +78,6 @@ KVM_NVHE_ALIAS(gic_nonsecure_priorities); KVM_NVHE_ALIAS(__start___kvm_ex_table); KVM_NVHE_ALIAS(__stop___kvm_ex_table); -/* Array containing bases of nVHE per-CPU memory regions. */ -KVM_NVHE_ALIAS(kvm_arm_hyp_percpu_base); - /* PMU available static key */ #ifdef CONFIG_HW_PERF_EVENTS KVM_NVHE_ALIAS(kvm_arm_pmu_available); @@ -103,12 +94,6 @@ KVM_NVHE_ALIAS_HYP(__memcpy, __pi_memcpy); KVM_NVHE_ALIAS_HYP(__memset, __pi_memset); #endif -/* Kernel memory sections */ -KVM_NVHE_ALIAS(__start_rodata); -KVM_NVHE_ALIAS(__end_rodata); -KVM_NVHE_ALIAS(__bss_start); -KVM_NVHE_ALIAS(__bss_stop); - /* Hyp memory sections */ KVM_NVHE_ALIAS(__hyp_idmap_text_start); KVM_NVHE_ALIAS(__hyp_idmap_text_end); diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index 7467217c1eaf..f5bcb0dc6267 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -41,19 +41,17 @@ static void mte_sync_page_tags(struct page *page, pte_t old_pte, if (check_swap && is_swap_pte(old_pte)) { swp_entry_t entry = pte_to_swp_entry(old_pte); - if (!non_swap_entry(entry) && mte_restore_tags(entry, page)) - return; + if (!non_swap_entry(entry)) + mte_restore_tags(entry, page); } if (!pte_is_tagged) return; - /* - * Test PG_mte_tagged again in case it was racing with another - * set_pte_at(). - */ - if (!test_and_set_bit(PG_mte_tagged, &page->flags)) + if (try_page_mte_tagging(page)) { mte_clear_page_tags(page_address(page)); + set_page_mte_tagged(page); + } } void mte_sync_tags(pte_t old_pte, pte_t pte) @@ -69,9 +67,11 @@ void mte_sync_tags(pte_t old_pte, pte_t pte) /* if PG_mte_tagged is set, tags have already been initialised */ for (i = 0; i < nr_pages; i++, page++) { - if (!test_bit(PG_mte_tagged, &page->flags)) + if (!page_mte_tagged(page)) { mte_sync_page_tags(page, old_pte, check_swap, pte_is_tagged); + set_page_mte_tagged(page); + } } /* ensure the tags are visible before the PTE is set */ @@ -96,8 +96,7 @@ int memcmp_pages(struct page *page1, struct page *page2) * pages is tagged, set_pte_at() may zero or change the tags of the * other page via mte_sync_tags(). */ - if (test_bit(PG_mte_tagged, &page1->flags) || - test_bit(PG_mte_tagged, &page2->flags)) + if (page_mte_tagged(page1) || page_mte_tagged(page2)) return addr1 != addr2; return ret; @@ -454,7 +453,7 @@ static int __access_remote_tags(struct mm_struct *mm, unsigned long addr, put_page(page); break; } - WARN_ON_ONCE(!test_bit(PG_mte_tagged, &page->flags)); + WARN_ON_ONCE(!page_mte_tagged(page)); /* limit access to the end of the page */ offset = offset_in_page(addr); diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 815cc118c675..05da3c8f7e88 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -32,6 +32,8 @@ menuconfig KVM select KVM_VFIO select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD + select HAVE_KVM_DIRTY_RING_ACQ_REL + select NEED_KVM_DIRTY_RING_WITH_BITMAP select HAVE_KVM_MSI select HAVE_KVM_IRQCHIP select HAVE_KVM_IRQ_ROUTING diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 94d33e296e10..9c5573bc4614 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -37,6 +37,7 @@ #include <asm/kvm_arm.h> #include <asm/kvm_asm.h> #include <asm/kvm_mmu.h> +#include <asm/kvm_pkvm.h> #include <asm/kvm_emulate.h> #include <asm/sections.h> @@ -50,7 +51,6 @@ DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized); DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector); DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); -unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params); static bool vgic_present; @@ -138,24 +138,24 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) { int ret; - ret = kvm_arm_setup_stage2(kvm, type); - if (ret) - return ret; - - ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu); + ret = kvm_share_hyp(kvm, kvm + 1); if (ret) return ret; - ret = kvm_share_hyp(kvm, kvm + 1); + ret = pkvm_init_host_vm(kvm); if (ret) - goto out_free_stage2_pgd; + goto err_unshare_kvm; if (!zalloc_cpumask_var(&kvm->arch.supported_cpus, GFP_KERNEL)) { ret = -ENOMEM; - goto out_free_stage2_pgd; + goto err_unshare_kvm; } cpumask_copy(kvm->arch.supported_cpus, cpu_possible_mask); + ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu, type); + if (ret) + goto err_free_cpumask; + kvm_vgic_early_init(kvm); /* The maximum number of VCPUs is limited by the host's GIC model */ @@ -164,9 +164,18 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) set_default_spectre(kvm); kvm_arm_init_hypercalls(kvm); - return ret; -out_free_stage2_pgd: - kvm_free_stage2_pgd(&kvm->arch.mmu); + /* + * Initialise the default PMUver before there is a chance to + * create an actual PMU. + */ + kvm->arch.dfr0_pmuver.imp = kvm_arm_pmu_get_pmuver_limit(); + + return 0; + +err_free_cpumask: + free_cpumask_var(kvm->arch.supported_cpus); +err_unshare_kvm: + kvm_unshare_hyp(kvm, kvm + 1); return ret; } @@ -187,6 +196,9 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kvm_vgic_destroy(kvm); + if (is_protected_kvm_enabled()) + pkvm_destroy_hyp_vm(kvm); + kvm_destroy_vcpus(kvm); kvm_unshare_hyp(kvm, kvm + 1); @@ -569,6 +581,12 @@ int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu) if (ret) return ret; + if (is_protected_kvm_enabled()) { + ret = pkvm_create_hyp_vm(kvm); + if (ret) + return ret; + } + if (!irqchip_in_kernel(kvm)) { /* * Tell the rest of the code that there are userspace irqchip @@ -746,6 +764,9 @@ static int check_vcpu_requests(struct kvm_vcpu *vcpu) if (kvm_check_request(KVM_REQ_SUSPEND, vcpu)) return kvm_vcpu_suspend(vcpu); + + if (kvm_dirty_ring_check_request(vcpu)) + return 0; } return 1; @@ -1518,7 +1539,7 @@ static int kvm_init_vector_slots(void) return 0; } -static void cpu_prepare_hyp_mode(int cpu) +static void cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits) { struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu); unsigned long tcr; @@ -1534,23 +1555,9 @@ static void cpu_prepare_hyp_mode(int cpu) params->mair_el2 = read_sysreg(mair_el1); - /* - * The ID map may be configured to use an extended virtual address - * range. This is only the case if system RAM is out of range for the - * currently configured page size and VA_BITS, in which case we will - * also need the extended virtual range for the HYP ID map, or we won't - * be able to enable the EL2 MMU. - * - * However, at EL2, there is only one TTBR register, and we can't switch - * between translation tables *and* update TCR_EL2.T0SZ at the same - * time. Bottom line: we need to use the extended range with *both* our - * translation tables. - * - * So use the same T0SZ value we use for the ID map. - */ tcr = (read_sysreg(tcr_el1) & TCR_EL2_MASK) | TCR_EL2_RES1; tcr &= ~TCR_T0SZ_MASK; - tcr |= (idmap_t0sz & GENMASK(TCR_TxSZ_WIDTH - 1, 0)) << TCR_T0SZ_OFFSET; + tcr |= TCR_T0SZ(hyp_va_bits); params->tcr_el2 = tcr; params->pgd_pa = kvm_mmu_get_httbr(); @@ -1844,13 +1851,13 @@ static void teardown_hyp_mode(void) free_hyp_pgds(); for_each_possible_cpu(cpu) { free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); - free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order()); + free_pages(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu], nvhe_percpu_order()); } } static int do_pkvm_init(u32 hyp_va_bits) { - void *per_cpu_base = kvm_ksym_ref(kvm_arm_hyp_percpu_base); + void *per_cpu_base = kvm_ksym_ref(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)); int ret; preempt_disable(); @@ -1870,11 +1877,8 @@ static int do_pkvm_init(u32 hyp_va_bits) return ret; } -static int kvm_hyp_init_protection(u32 hyp_va_bits) +static void kvm_hyp_init_symbols(void) { - void *addr = phys_to_virt(hyp_mem_base); - int ret; - kvm_nvhe_sym(id_aa64pfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); kvm_nvhe_sym(id_aa64pfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1); kvm_nvhe_sym(id_aa64isar0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR0_EL1); @@ -1883,6 +1887,14 @@ static int kvm_hyp_init_protection(u32 hyp_va_bits) kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR2_EL1); + kvm_nvhe_sym(__icache_flags) = __icache_flags; + kvm_nvhe_sym(kvm_arm_vmid_bits) = kvm_arm_vmid_bits; +} + +static int kvm_hyp_init_protection(u32 hyp_va_bits) +{ + void *addr = phys_to_virt(hyp_mem_base); + int ret; ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP); if (ret) @@ -1950,7 +1962,7 @@ static int init_hyp_mode(void) page_addr = page_address(page); memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size()); - kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr; + kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu] = (unsigned long)page_addr; } /* @@ -2043,7 +2055,7 @@ static int init_hyp_mode(void) } for_each_possible_cpu(cpu) { - char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu]; + char *percpu_begin = (char *)kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; char *percpu_end = percpu_begin + nvhe_percpu_size(); /* Map Hyp percpu pages */ @@ -2054,9 +2066,11 @@ static int init_hyp_mode(void) } /* Prepare the CPU initialization parameters */ - cpu_prepare_hyp_mode(cpu); + cpu_prepare_hyp_mode(cpu, hyp_va_bits); } + kvm_hyp_init_symbols(); + if (is_protected_kvm_enabled()) { init_cpu_logical_map(); @@ -2064,9 +2078,7 @@ static int init_hyp_mode(void) err = -ENODEV; goto out_err; } - } - if (is_protected_kvm_enabled()) { err = kvm_hyp_init_protection(hyp_va_bits); if (err) { kvm_err("Failed to init hyp memory protection\n"); @@ -2130,6 +2142,11 @@ struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr) return NULL; } +bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) +{ + return irqchip_in_kernel(kvm); +} + bool kvm_arch_has_irq_bypass(void) { return true; diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 2ff13a3f8479..5626ddb540ce 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -1059,7 +1059,7 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm, maddr = page_address(page); if (!write) { - if (test_bit(PG_mte_tagged, &page->flags)) + if (page_mte_tagged(page)) num_tags = mte_copy_tags_to_user(tags, maddr, MTE_GRANULES_PER_PAGE); else @@ -1068,15 +1068,19 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm, clear_user(tags, MTE_GRANULES_PER_PAGE); kvm_release_pfn_clean(pfn); } else { + /* + * Only locking to serialise with a concurrent + * set_pte_at() in the VMM but still overriding the + * tags, hence ignoring the return value. + */ + try_page_mte_tagging(page); num_tags = mte_copy_tags_from_user(maddr, tags, MTE_GRANULES_PER_PAGE); - /* - * Set the flag after checking the write - * completed fully - */ - if (num_tags == MTE_GRANULES_PER_PAGE) - set_bit(PG_mte_tagged, &page->flags); + /* uaccess failed, don't leave stale tags */ + if (num_tags != MTE_GRANULES_PER_PAGE) + mte_clear_page_tags(page); + set_page_mte_tagged(page); kvm_release_pfn_dirty(pfn); } diff --git a/arch/arm64/kvm/hyp/hyp-constants.c b/arch/arm64/kvm/hyp/hyp-constants.c index b3742a6691e8..b257a3b4bfc5 100644 --- a/arch/arm64/kvm/hyp/hyp-constants.c +++ b/arch/arm64/kvm/hyp/hyp-constants.c @@ -2,9 +2,12 @@ #include <linux/kbuild.h> #include <nvhe/memory.h> +#include <nvhe/pkvm.h> int main(void) { DEFINE(STRUCT_HYP_PAGE_SIZE, sizeof(struct hyp_page)); + DEFINE(PKVM_HYP_VM_SIZE, sizeof(struct pkvm_hyp_vm)); + DEFINE(PKVM_HYP_VCPU_SIZE, sizeof(struct pkvm_hyp_vcpu)); return 0; } diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h index 80e99836eac7..b7bdbe63deed 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -8,8 +8,10 @@ #define __KVM_NVHE_MEM_PROTECT__ #include <linux/kvm_host.h> #include <asm/kvm_hyp.h> +#include <asm/kvm_mmu.h> #include <asm/kvm_pgtable.h> #include <asm/virt.h> +#include <nvhe/pkvm.h> #include <nvhe/spinlock.h> /* @@ -43,30 +45,45 @@ static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot) return prot & PKVM_PAGE_STATE_PROT_MASK; } -struct host_kvm { +struct host_mmu { struct kvm_arch arch; struct kvm_pgtable pgt; struct kvm_pgtable_mm_ops mm_ops; hyp_spinlock_t lock; }; -extern struct host_kvm host_kvm; +extern struct host_mmu host_mmu; -extern const u8 pkvm_hyp_id; +/* This corresponds to page-table locking order */ +enum pkvm_component_id { + PKVM_ID_HOST, + PKVM_ID_HYP, +}; + +extern unsigned long hyp_nr_cpus; int __pkvm_prot_finalize(void); int __pkvm_host_share_hyp(u64 pfn); int __pkvm_host_unshare_hyp(u64 pfn); +int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages); +int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages); bool addr_is_memory(phys_addr_t phys); int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot); int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id); int kvm_host_prepare_stage2(void *pgt_pool_base); +int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd); void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt); +int hyp_pin_shared_mem(void *from, void *to); +void hyp_unpin_shared_mem(void *from, void *to); +void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *mc); +int refill_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages, + struct kvm_hyp_memcache *host_mc); + static __always_inline void __load_host_stage2(void) { if (static_branch_likely(&kvm_protected_mode_initialized)) - __load_stage2(&host_kvm.arch.mmu, &host_kvm.arch); + __load_stage2(&host_mmu.arch.mmu, &host_mmu.arch); else write_sysreg(0, vttbr_el2); } diff --git a/arch/arm64/kvm/hyp/include/nvhe/memory.h b/arch/arm64/kvm/hyp/include/nvhe/memory.h index 592b7edb3edb..ab205c4d6774 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/memory.h +++ b/arch/arm64/kvm/hyp/include/nvhe/memory.h @@ -38,6 +38,10 @@ static inline phys_addr_t hyp_virt_to_phys(void *addr) #define hyp_page_to_virt(page) __hyp_va(hyp_page_to_phys(page)) #define hyp_page_to_pool(page) (((struct hyp_page *)page)->pool) +/* + * Refcounting for 'struct hyp_page'. + * hyp_pool::lock must be held if atomic access to the refcount is required. + */ static inline int hyp_page_count(void *addr) { struct hyp_page *p = hyp_virt_to_page(addr); @@ -45,4 +49,27 @@ static inline int hyp_page_count(void *addr) return p->refcount; } +static inline void hyp_page_ref_inc(struct hyp_page *p) +{ + BUG_ON(p->refcount == USHRT_MAX); + p->refcount++; +} + +static inline void hyp_page_ref_dec(struct hyp_page *p) +{ + BUG_ON(!p->refcount); + p->refcount--; +} + +static inline int hyp_page_ref_dec_and_test(struct hyp_page *p) +{ + hyp_page_ref_dec(p); + return (p->refcount == 0); +} + +static inline void hyp_set_page_refcounted(struct hyp_page *p) +{ + BUG_ON(p->refcount); + p->refcount = 1; +} #endif /* __KVM_HYP_MEMORY_H */ diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h index 42d8eb9bfe72..d5ec972b5c1e 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h @@ -13,9 +13,13 @@ extern struct kvm_pgtable pkvm_pgtable; extern hyp_spinlock_t pkvm_pgd_lock; +int hyp_create_pcpu_fixmap(void); +void *hyp_fixmap_map(phys_addr_t phys); +void hyp_fixmap_unmap(void); + int hyp_create_idmap(u32 hyp_va_bits); int hyp_map_vectors(void); -int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back); +int hyp_back_vmemmap(phys_addr_t back); int pkvm_cpu_set_vector(enum arm64_hyp_spectre_vector slot); int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot); int pkvm_create_mappings_locked(void *from, void *to, enum kvm_pgtable_prot prot); @@ -24,16 +28,4 @@ int __pkvm_create_private_mapping(phys_addr_t phys, size_t size, unsigned long *haddr); int pkvm_alloc_private_va_range(size_t size, unsigned long *haddr); -static inline void hyp_vmemmap_range(phys_addr_t phys, unsigned long size, - unsigned long *start, unsigned long *end) -{ - unsigned long nr_pages = size >> PAGE_SHIFT; - struct hyp_page *p = hyp_phys_to_page(phys); - - *start = (unsigned long)p; - *end = *start + nr_pages * sizeof(struct hyp_page); - *start = ALIGN_DOWN(*start, PAGE_SIZE); - *end = ALIGN(*end, PAGE_SIZE); -} - #endif /* __KVM_HYP_MM_H */ diff --git a/arch/arm64/kvm/hyp/include/nvhe/pkvm.h b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h new file mode 100644 index 000000000000..82b3d62538a6 --- /dev/null +++ b/arch/arm64/kvm/hyp/include/nvhe/pkvm.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2021 Google LLC + * Author: Fuad Tabba <tabba@google.com> + */ + +#ifndef __ARM64_KVM_NVHE_PKVM_H__ +#define __ARM64_KVM_NVHE_PKVM_H__ + +#include <asm/kvm_pkvm.h> + +#include <nvhe/gfp.h> +#include <nvhe/spinlock.h> + +/* + * Holds the relevant data for maintaining the vcpu state completely at hyp. + */ +struct pkvm_hyp_vcpu { + struct kvm_vcpu vcpu; + + /* Backpointer to the host's (untrusted) vCPU instance. */ + struct kvm_vcpu *host_vcpu; +}; + +/* + * Holds the relevant data for running a protected vm. + */ +struct pkvm_hyp_vm { + struct kvm kvm; + + /* Backpointer to the host's (untrusted) KVM instance. */ + struct kvm *host_kvm; + + /* The guest's stage-2 page-table managed by the hypervisor. */ + struct kvm_pgtable pgt; + struct kvm_pgtable_mm_ops mm_ops; + struct hyp_pool pool; + hyp_spinlock_t lock; + + /* + * The number of vcpus initialized and ready to run. + * Modifying this is protected by 'vm_table_lock'. + */ + unsigned int nr_vcpus; + + /* Array of the hyp vCPU structures for this VM. */ + struct pkvm_hyp_vcpu *vcpus[]; +}; + +static inline struct pkvm_hyp_vm * +pkvm_hyp_vcpu_to_hyp_vm(struct pkvm_hyp_vcpu *hyp_vcpu) +{ + return container_of(hyp_vcpu->vcpu.kvm, struct pkvm_hyp_vm, kvm); +} + +void pkvm_hyp_vm_table_init(void *tbl); + +int __pkvm_init_vm(struct kvm *host_kvm, unsigned long vm_hva, + unsigned long pgd_hva); +int __pkvm_init_vcpu(pkvm_handle_t handle, struct kvm_vcpu *host_vcpu, + unsigned long vcpu_hva); +int __pkvm_teardown_vm(pkvm_handle_t handle); + +struct pkvm_hyp_vcpu *pkvm_load_hyp_vcpu(pkvm_handle_t handle, + unsigned int vcpu_idx); +void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu); + +#endif /* __ARM64_KVM_NVHE_PKVM_H__ */ diff --git a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h index 4652fd04bdbe..7c7ea8c55405 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/spinlock.h +++ b/arch/arm64/kvm/hyp/include/nvhe/spinlock.h @@ -28,9 +28,17 @@ typedef union hyp_spinlock { }; } hyp_spinlock_t; +#define __HYP_SPIN_LOCK_INITIALIZER \ + { .__val = 0 } + +#define __HYP_SPIN_LOCK_UNLOCKED \ + ((hyp_spinlock_t) __HYP_SPIN_LOCK_INITIALIZER) + +#define DEFINE_HYP_SPINLOCK(x) hyp_spinlock_t x = __HYP_SPIN_LOCK_UNLOCKED + #define hyp_spin_lock_init(l) \ do { \ - *(l) = (hyp_spinlock_t){ .__val = 0 }; \ + *(l) = __HYP_SPIN_LOCK_UNLOCKED; \ } while (0) static inline void hyp_spin_lock(hyp_spinlock_t *lock) diff --git a/arch/arm64/kvm/hyp/nvhe/cache.S b/arch/arm64/kvm/hyp/nvhe/cache.S index 0c367eb5f4e2..85936c17ae40 100644 --- a/arch/arm64/kvm/hyp/nvhe/cache.S +++ b/arch/arm64/kvm/hyp/nvhe/cache.S @@ -12,3 +12,14 @@ SYM_FUNC_START(__pi_dcache_clean_inval_poc) ret SYM_FUNC_END(__pi_dcache_clean_inval_poc) SYM_FUNC_ALIAS(dcache_clean_inval_poc, __pi_dcache_clean_inval_poc) + +SYM_FUNC_START(__pi_icache_inval_pou) +alternative_if ARM64_HAS_CACHE_DIC + isb + ret +alternative_else_nop_endif + + invalidate_icache_by_line x0, x1, x2, x3 + ret +SYM_FUNC_END(__pi_icache_inval_pou) +SYM_FUNC_ALIAS(icache_inval_pou, __pi_icache_inval_pou) diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c index 3cea4b6ac23e..728e01d4536b 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -15,17 +15,93 @@ #include <nvhe/mem_protect.h> #include <nvhe/mm.h> +#include <nvhe/pkvm.h> #include <nvhe/trap_handler.h> DEFINE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params); void __kvm_hyp_host_forward_smc(struct kvm_cpu_context *host_ctxt); +static void flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu) +{ + struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu; + + hyp_vcpu->vcpu.arch.ctxt = host_vcpu->arch.ctxt; + + hyp_vcpu->vcpu.arch.sve_state = kern_hyp_va(host_vcpu->arch.sve_state); + hyp_vcpu->vcpu.arch.sve_max_vl = host_vcpu->arch.sve_max_vl; + + hyp_vcpu->vcpu.arch.hw_mmu = host_vcpu->arch.hw_mmu; + + hyp_vcpu->vcpu.arch.hcr_el2 = host_vcpu->arch.hcr_el2; + hyp_vcpu->vcpu.arch.mdcr_el2 = host_vcpu->arch.mdcr_el2; + hyp_vcpu->vcpu.arch.cptr_el2 = host_vcpu->arch.cptr_el2; + + hyp_vcpu->vcpu.arch.iflags = host_vcpu->arch.iflags; + hyp_vcpu->vcpu.arch.fp_state = host_vcpu->arch.fp_state; + + hyp_vcpu->vcpu.arch.debug_ptr = kern_hyp_va(host_vcpu->arch.debug_ptr); + hyp_vcpu->vcpu.arch.host_fpsimd_state = host_vcpu->arch.host_fpsimd_state; + + hyp_vcpu->vcpu.arch.vsesr_el2 = host_vcpu->arch.vsesr_el2; + + hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3 = host_vcpu->arch.vgic_cpu.vgic_v3; +} + +static void sync_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu) +{ + struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu; + struct vgic_v3_cpu_if *hyp_cpu_if = &hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3; + struct vgic_v3_cpu_if *host_cpu_if = &host_vcpu->arch.vgic_cpu.vgic_v3; + unsigned int i; + + host_vcpu->arch.ctxt = hyp_vcpu->vcpu.arch.ctxt; + + host_vcpu->arch.hcr_el2 = hyp_vcpu->vcpu.arch.hcr_el2; + host_vcpu->arch.cptr_el2 = hyp_vcpu->vcpu.arch.cptr_el2; + + host_vcpu->arch.fault = hyp_vcpu->vcpu.arch.fault; + + host_vcpu->arch.iflags = hyp_vcpu->vcpu.arch.iflags; + host_vcpu->arch.fp_state = hyp_vcpu->vcpu.arch.fp_state; + + host_cpu_if->vgic_hcr = hyp_cpu_if->vgic_hcr; + for (i = 0; i < hyp_cpu_if->used_lrs; ++i) + host_cpu_if->vgic_lr[i] = hyp_cpu_if->vgic_lr[i]; +} + static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt) { - DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1); + DECLARE_REG(struct kvm_vcpu *, host_vcpu, host_ctxt, 1); + int ret; - cpu_reg(host_ctxt, 1) = __kvm_vcpu_run(kern_hyp_va(vcpu)); + host_vcpu = kern_hyp_va(host_vcpu); + + if (unlikely(is_protected_kvm_enabled())) { + struct pkvm_hyp_vcpu *hyp_vcpu; + struct kvm *host_kvm; + + host_kvm = kern_hyp_va(host_vcpu->kvm); + hyp_vcpu = pkvm_load_hyp_vcpu(host_kvm->arch.pkvm.handle, + host_vcpu->vcpu_idx); + if (!hyp_vcpu) { + ret = -EINVAL; + goto out; + } + + flush_hyp_vcpu(hyp_vcpu); + + ret = __kvm_vcpu_run(&hyp_vcpu->vcpu); + + sync_hyp_vcpu(hyp_vcpu); + pkvm_put_hyp_vcpu(hyp_vcpu); + } else { + /* The host is fully trusted, run its vCPU directly. */ + ret = __kvm_vcpu_run(host_vcpu); + } + +out: + cpu_reg(host_ctxt, 1) = ret; } static void handle___kvm_adjust_pc(struct kvm_cpu_context *host_ctxt) @@ -191,6 +267,33 @@ static void handle___pkvm_vcpu_init_traps(struct kvm_cpu_context *host_ctxt) __pkvm_vcpu_init_traps(kern_hyp_va(vcpu)); } +static void handle___pkvm_init_vm(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(struct kvm *, host_kvm, host_ctxt, 1); + DECLARE_REG(unsigned long, vm_hva, host_ctxt, 2); + DECLARE_REG(unsigned long, pgd_hva, host_ctxt, 3); + + host_kvm = kern_hyp_va(host_kvm); + cpu_reg(host_ctxt, 1) = __pkvm_init_vm(host_kvm, vm_hva, pgd_hva); +} + +static void handle___pkvm_init_vcpu(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1); + DECLARE_REG(struct kvm_vcpu *, host_vcpu, host_ctxt, 2); + DECLARE_REG(unsigned long, vcpu_hva, host_ctxt, 3); + + host_vcpu = kern_hyp_va(host_vcpu); + cpu_reg(host_ctxt, 1) = __pkvm_init_vcpu(handle, host_vcpu, vcpu_hva); +} + +static void handle___pkvm_teardown_vm(struct kvm_cpu_context *host_ctxt) +{ + DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1); + + cpu_reg(host_ctxt, 1) = __pkvm_teardown_vm(handle); +} + typedef void (*hcall_t)(struct kvm_cpu_context *); #define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x @@ -220,6 +323,9 @@ static const hcall_t host_hcall[] = { HANDLE_FUNC(__vgic_v3_save_aprs), HANDLE_FUNC(__vgic_v3_restore_aprs), HANDLE_FUNC(__pkvm_vcpu_init_traps), + HANDLE_FUNC(__pkvm_init_vm), + HANDLE_FUNC(__pkvm_init_vcpu), + HANDLE_FUNC(__pkvm_teardown_vm), }; static void handle_host_hcall(struct kvm_cpu_context *host_ctxt) diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c index 9f54833af400..04d194583f1e 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c @@ -23,6 +23,8 @@ u64 cpu_logical_map(unsigned int cpu) return hyp_cpu_logical_map[cpu]; } +unsigned long __ro_after_init kvm_arm_hyp_percpu_base[NR_CPUS]; + unsigned long __hyp_per_cpu_offset(unsigned int cpu) { unsigned long *cpu_base_array; diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index 07f9dc9848ef..552653fa18be 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -21,21 +21,33 @@ #define KVM_HOST_S2_FLAGS (KVM_PGTABLE_S2_NOFWB | KVM_PGTABLE_S2_IDMAP) -extern unsigned long hyp_nr_cpus; -struct host_kvm host_kvm; +struct host_mmu host_mmu; static struct hyp_pool host_s2_pool; -const u8 pkvm_hyp_id = 1; +static DEFINE_PER_CPU(struct pkvm_hyp_vm *, __current_vm); +#define current_vm (*this_cpu_ptr(&__current_vm)) + +static void guest_lock_component(struct pkvm_hyp_vm *vm) +{ + hyp_spin_lock(&vm->lock); + current_vm = vm; +} + +static void guest_unlock_component(struct pkvm_hyp_vm *vm) +{ + current_vm = NULL; + hyp_spin_unlock(&vm->lock); +} static void host_lock_component(void) { - hyp_spin_lock(&host_kvm.lock); + hyp_spin_lock(&host_mmu.lock); } static void host_unlock_component(void) { - hyp_spin_unlock(&host_kvm.lock); + hyp_spin_unlock(&host_mmu.lock); } static void hyp_lock_component(void) @@ -79,6 +91,11 @@ static void host_s2_put_page(void *addr) hyp_put_page(&host_s2_pool, addr); } +static void host_s2_free_removed_table(void *addr, u32 level) +{ + kvm_pgtable_stage2_free_removed(&host_mmu.mm_ops, addr, level); +} + static int prepare_s2_pool(void *pgt_pool_base) { unsigned long nr_pages, pfn; @@ -90,9 +107,10 @@ static int prepare_s2_pool(void *pgt_pool_base) if (ret) return ret; - host_kvm.mm_ops = (struct kvm_pgtable_mm_ops) { + host_mmu.mm_ops = (struct kvm_pgtable_mm_ops) { .zalloc_pages_exact = host_s2_zalloc_pages_exact, .zalloc_page = host_s2_zalloc_page, + .free_removed_table = host_s2_free_removed_table, .phys_to_virt = hyp_phys_to_virt, .virt_to_phys = hyp_virt_to_phys, .page_count = hyp_page_count, @@ -111,7 +129,7 @@ static void prepare_host_vtcr(void) parange = kvm_get_parange(id_aa64mmfr0_el1_sys_val); phys_shift = id_aa64mmfr0_parange_to_phys_shift(parange); - host_kvm.arch.vtcr = kvm_get_vtcr(id_aa64mmfr0_el1_sys_val, + host_mmu.arch.vtcr = kvm_get_vtcr(id_aa64mmfr0_el1_sys_val, id_aa64mmfr1_el1_sys_val, phys_shift); } @@ -119,45 +137,170 @@ static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot pr int kvm_host_prepare_stage2(void *pgt_pool_base) { - struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu; + struct kvm_s2_mmu *mmu = &host_mmu.arch.mmu; int ret; prepare_host_vtcr(); - hyp_spin_lock_init(&host_kvm.lock); - mmu->arch = &host_kvm.arch; + hyp_spin_lock_init(&host_mmu.lock); + mmu->arch = &host_mmu.arch; ret = prepare_s2_pool(pgt_pool_base); if (ret) return ret; - ret = __kvm_pgtable_stage2_init(&host_kvm.pgt, mmu, - &host_kvm.mm_ops, KVM_HOST_S2_FLAGS, + ret = __kvm_pgtable_stage2_init(&host_mmu.pgt, mmu, + &host_mmu.mm_ops, KVM_HOST_S2_FLAGS, host_stage2_force_pte_cb); if (ret) return ret; - mmu->pgd_phys = __hyp_pa(host_kvm.pgt.pgd); - mmu->pgt = &host_kvm.pgt; + mmu->pgd_phys = __hyp_pa(host_mmu.pgt.pgd); + mmu->pgt = &host_mmu.pgt; atomic64_set(&mmu->vmid.id, 0); return 0; } +static bool guest_stage2_force_pte_cb(u64 addr, u64 end, + enum kvm_pgtable_prot prot) +{ + return true; +} + +static void *guest_s2_zalloc_pages_exact(size_t size) +{ + void *addr = hyp_alloc_pages(¤t_vm->pool, get_order(size)); + + WARN_ON(size != (PAGE_SIZE << get_order(size))); + hyp_split_page(hyp_virt_to_page(addr)); + + return addr; +} + +static void guest_s2_free_pages_exact(void *addr, unsigned long size) +{ + u8 order = get_order(size); + unsigned int i; + + for (i = 0; i < (1 << order); i++) + hyp_put_page(¤t_vm->pool, addr + (i * PAGE_SIZE)); +} + +static void *guest_s2_zalloc_page(void *mc) +{ + struct hyp_page *p; + void *addr; + + addr = hyp_alloc_pages(¤t_vm->pool, 0); + if (addr) + return addr; + + addr = pop_hyp_memcache(mc, hyp_phys_to_virt); + if (!addr) + return addr; + + memset(addr, 0, PAGE_SIZE); + p = hyp_virt_to_page(addr); + memset(p, 0, sizeof(*p)); + p->refcount = 1; + + return addr; +} + +static void guest_s2_get_page(void *addr) +{ + hyp_get_page(¤t_vm->pool, addr); +} + +static void guest_s2_put_page(void *addr) +{ + hyp_put_page(¤t_vm->pool, addr); +} + +static void clean_dcache_guest_page(void *va, size_t size) +{ + __clean_dcache_guest_page(hyp_fixmap_map(__hyp_pa(va)), size); + hyp_fixmap_unmap(); +} + +static void invalidate_icache_guest_page(void *va, size_t size) +{ + __invalidate_icache_guest_page(hyp_fixmap_map(__hyp_pa(va)), size); + hyp_fixmap_unmap(); +} + +int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd) +{ + struct kvm_s2_mmu *mmu = &vm->kvm.arch.mmu; + unsigned long nr_pages; + int ret; + + nr_pages = kvm_pgtable_stage2_pgd_size(vm->kvm.arch.vtcr) >> PAGE_SHIFT; + ret = hyp_pool_init(&vm->pool, hyp_virt_to_pfn(pgd), nr_pages, 0); + if (ret) + return ret; + + hyp_spin_lock_init(&vm->lock); + vm->mm_ops = (struct kvm_pgtable_mm_ops) { + .zalloc_pages_exact = guest_s2_zalloc_pages_exact, + .free_pages_exact = guest_s2_free_pages_exact, + .zalloc_page = guest_s2_zalloc_page, + .phys_to_virt = hyp_phys_to_virt, + .virt_to_phys = hyp_virt_to_phys, + .page_count = hyp_page_count, + .get_page = guest_s2_get_page, + .put_page = guest_s2_put_page, + .dcache_clean_inval_poc = clean_dcache_guest_page, + .icache_inval_pou = invalidate_icache_guest_page, + }; + + guest_lock_component(vm); + ret = __kvm_pgtable_stage2_init(mmu->pgt, mmu, &vm->mm_ops, 0, + guest_stage2_force_pte_cb); + guest_unlock_component(vm); + if (ret) + return ret; + + vm->kvm.arch.mmu.pgd_phys = __hyp_pa(vm->pgt.pgd); + + return 0; +} + +void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *mc) +{ + void *addr; + + /* Dump all pgtable pages in the hyp_pool */ + guest_lock_component(vm); + kvm_pgtable_stage2_destroy(&vm->pgt); + vm->kvm.arch.mmu.pgd_phys = 0ULL; + guest_unlock_component(vm); + + /* Drain the hyp_pool into the memcache */ + addr = hyp_alloc_pages(&vm->pool, 0); + while (addr) { + memset(hyp_virt_to_page(addr), 0, sizeof(struct hyp_page)); + push_hyp_memcache(mc, addr, hyp_virt_to_phys); + WARN_ON(__pkvm_hyp_donate_host(hyp_virt_to_pfn(addr), 1)); + addr = hyp_alloc_pages(&vm->pool, 0); + } +} + int __pkvm_prot_finalize(void) { - struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu; + struct kvm_s2_mmu *mmu = &host_mmu.arch.mmu; struct kvm_nvhe_init_params *params = this_cpu_ptr(&kvm_init_params); if (params->hcr_el2 & HCR_VM) return -EPERM; params->vttbr = kvm_get_vttbr(mmu); - params->vtcr = host_kvm.arch.vtcr; + params->vtcr = host_mmu.arch.vtcr; params->hcr_el2 |= HCR_VM; kvm_flush_dcache_to_poc(params, sizeof(*params)); write_sysreg(params->hcr_el2, hcr_el2); - __load_stage2(&host_kvm.arch.mmu, &host_kvm.arch); + __load_stage2(&host_mmu.arch.mmu, &host_mmu.arch); /* * Make sure to have an ISB before the TLB maintenance below but only @@ -175,7 +318,7 @@ int __pkvm_prot_finalize(void) static int host_stage2_unmap_dev_all(void) { - struct kvm_pgtable *pgt = &host_kvm.pgt; + struct kvm_pgtable *pgt = &host_mmu.pgt; struct memblock_region *reg; u64 addr = 0; int i, ret; @@ -195,7 +338,7 @@ struct kvm_mem_range { u64 end; }; -static bool find_mem_range(phys_addr_t addr, struct kvm_mem_range *range) +static struct memblock_region *find_mem_range(phys_addr_t addr, struct kvm_mem_range *range) { int cur, left = 0, right = hyp_memblock_nr; struct memblock_region *reg; @@ -218,18 +361,28 @@ static bool find_mem_range(phys_addr_t addr, struct kvm_mem_range *range) } else { range->start = reg->base; range->end = end; - return true; + return reg; } } - return false; + return NULL; } bool addr_is_memory(phys_addr_t phys) { struct kvm_mem_range range; - return find_mem_range(phys, &range); + return !!find_mem_range(phys, &range); +} + +static bool addr_is_allowed_memory(phys_addr_t phys) +{ + struct memblock_region *reg; + struct kvm_mem_range range; + + reg = find_mem_range(phys, &range); + + return reg && !(reg->flags & MEMBLOCK_NOMAP); } static bool is_in_mem_range(u64 addr, struct kvm_mem_range *range) @@ -250,8 +403,8 @@ static bool range_is_memory(u64 start, u64 end) static inline int __host_stage2_idmap(u64 start, u64 end, enum kvm_pgtable_prot prot) { - return kvm_pgtable_stage2_map(&host_kvm.pgt, start, end - start, start, - prot, &host_s2_pool); + return kvm_pgtable_stage2_map(&host_mmu.pgt, start, end - start, start, + prot, &host_s2_pool, 0); } /* @@ -263,7 +416,7 @@ static inline int __host_stage2_idmap(u64 start, u64 end, #define host_stage2_try(fn, ...) \ ({ \ int __ret; \ - hyp_assert_lock_held(&host_kvm.lock); \ + hyp_assert_lock_held(&host_mmu.lock); \ __ret = fn(__VA_ARGS__); \ if (__ret == -ENOMEM) { \ __ret = host_stage2_unmap_dev_all(); \ @@ -286,8 +439,8 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range) u32 level; int ret; - hyp_assert_lock_held(&host_kvm.lock); - ret = kvm_pgtable_get_leaf(&host_kvm.pgt, addr, &pte, &level); + hyp_assert_lock_held(&host_mmu.lock); + ret = kvm_pgtable_get_leaf(&host_mmu.pgt, addr, &pte, &level); if (ret) return ret; @@ -319,7 +472,7 @@ int host_stage2_idmap_locked(phys_addr_t addr, u64 size, int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id) { - return host_stage2_try(kvm_pgtable_stage2_set_owner, &host_kvm.pgt, + return host_stage2_try(kvm_pgtable_stage2_set_owner, &host_mmu.pgt, addr, size, &host_s2_pool, owner_id); } @@ -348,7 +501,7 @@ static bool host_stage2_force_pte_cb(u64 addr, u64 end, enum kvm_pgtable_prot pr static int host_stage2_idmap(u64 addr) { struct kvm_mem_range range; - bool is_memory = find_mem_range(addr, &range); + bool is_memory = !!find_mem_range(addr, &range); enum kvm_pgtable_prot prot; int ret; @@ -380,12 +533,6 @@ void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt) BUG_ON(ret && ret != -EAGAIN); } -/* This corresponds to locking order */ -enum pkvm_component_id { - PKVM_ID_HOST, - PKVM_ID_HYP, -}; - struct pkvm_mem_transition { u64 nr_pages; @@ -399,6 +546,9 @@ struct pkvm_mem_transition { /* Address in the completer's address space */ u64 completer_addr; } host; + struct { + u64 completer_addr; + } hyp; }; } initiator; @@ -412,23 +562,24 @@ struct pkvm_mem_share { const enum kvm_pgtable_prot completer_prot; }; +struct pkvm_mem_donation { + const struct pkvm_mem_transition tx; +}; + struct check_walk_data { enum pkvm_page_state desired; enum pkvm_page_state (*get_page_state)(kvm_pte_t pte); }; -static int __check_page_state_visitor(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg) +static int __check_page_state_visitor(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct check_walk_data *d = arg; - kvm_pte_t pte = *ptep; + struct check_walk_data *d = ctx->arg; - if (kvm_pte_valid(pte) && !addr_is_memory(kvm_pte_to_phys(pte))) + if (kvm_pte_valid(ctx->old) && !addr_is_allowed_memory(kvm_pte_to_phys(ctx->old))) return -EINVAL; - return d->get_page_state(pte) == d->desired ? 0 : -EPERM; + return d->get_page_state(ctx->old) == d->desired ? 0 : -EPERM; } static int check_page_state_range(struct kvm_pgtable *pgt, u64 addr, u64 size, @@ -459,8 +610,8 @@ static int __host_check_page_state_range(u64 addr, u64 size, .get_page_state = host_get_page_state, }; - hyp_assert_lock_held(&host_kvm.lock); - return check_page_state_range(&host_kvm.pgt, addr, size, &d); + hyp_assert_lock_held(&host_mmu.lock); + return check_page_state_range(&host_mmu.pgt, addr, size, &d); } static int __host_set_page_state_range(u64 addr, u64 size, @@ -511,6 +662,46 @@ static int host_initiate_unshare(u64 *completer_addr, return __host_set_page_state_range(addr, size, PKVM_PAGE_OWNED); } +static int host_initiate_donation(u64 *completer_addr, + const struct pkvm_mem_transition *tx) +{ + u8 owner_id = tx->completer.id; + u64 size = tx->nr_pages * PAGE_SIZE; + + *completer_addr = tx->initiator.host.completer_addr; + return host_stage2_set_owner_locked(tx->initiator.addr, size, owner_id); +} + +static bool __host_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx) +{ + return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) || + tx->initiator.id != PKVM_ID_HYP); +} + +static int __host_ack_transition(u64 addr, const struct pkvm_mem_transition *tx, + enum pkvm_page_state state) +{ + u64 size = tx->nr_pages * PAGE_SIZE; + + if (__host_ack_skip_pgtable_check(tx)) + return 0; + + return __host_check_page_state_range(addr, size, state); +} + +static int host_ack_donation(u64 addr, const struct pkvm_mem_transition *tx) +{ + return __host_ack_transition(addr, tx, PKVM_NOPAGE); +} + +static int host_complete_donation(u64 addr, const struct pkvm_mem_transition *tx) +{ + u64 size = tx->nr_pages * PAGE_SIZE; + u8 host_id = tx->completer.id; + + return host_stage2_set_owner_locked(addr, size, host_id); +} + static enum pkvm_page_state hyp_get_page_state(kvm_pte_t pte) { if (!kvm_pte_valid(pte)) @@ -531,6 +722,27 @@ static int __hyp_check_page_state_range(u64 addr, u64 size, return check_page_state_range(&pkvm_pgtable, addr, size, &d); } +static int hyp_request_donation(u64 *completer_addr, + const struct pkvm_mem_transition *tx) +{ + u64 size = tx->nr_pages * PAGE_SIZE; + u64 addr = tx->initiator.addr; + + *completer_addr = tx->initiator.hyp.completer_addr; + return __hyp_check_page_state_range(addr, size, PKVM_PAGE_OWNED); +} + +static int hyp_initiate_donation(u64 *completer_addr, + const struct pkvm_mem_transition *tx) +{ + u64 size = tx->nr_pages * PAGE_SIZE; + int ret; + + *completer_addr = tx->initiator.hyp.completer_addr; + ret = kvm_pgtable_hyp_unmap(&pkvm_pgtable, tx->initiator.addr, size); + return (ret != size) ? -EFAULT : 0; +} + static bool __hyp_ack_skip_pgtable_check(const struct pkvm_mem_transition *tx) { return !(IS_ENABLED(CONFIG_NVHE_EL2_DEBUG) || @@ -555,6 +767,9 @@ static int hyp_ack_unshare(u64 addr, const struct pkvm_mem_transition *tx) { u64 size = tx->nr_pages * PAGE_SIZE; + if (tx->initiator.id == PKVM_ID_HOST && hyp_page_count((void *)addr)) + return -EBUSY; + if (__hyp_ack_skip_pgtable_check(tx)) return 0; @@ -562,6 +777,16 @@ static int hyp_ack_unshare(u64 addr, const struct pkvm_mem_transition *tx) PKVM_PAGE_SHARED_BORROWED); } +static int hyp_ack_donation(u64 addr, const struct pkvm_mem_transition *tx) +{ + u64 size = tx->nr_pages * PAGE_SIZE; + + if (__hyp_ack_skip_pgtable_check(tx)) + return 0; + + return __hyp_check_page_state_range(addr, size, PKVM_NOPAGE); +} + static int hyp_complete_share(u64 addr, const struct pkvm_mem_transition *tx, enum kvm_pgtable_prot perms) { @@ -580,6 +805,15 @@ static int hyp_complete_unshare(u64 addr, const struct pkvm_mem_transition *tx) return (ret != size) ? -EFAULT : 0; } +static int hyp_complete_donation(u64 addr, + const struct pkvm_mem_transition *tx) +{ + void *start = (void *)addr, *end = start + (tx->nr_pages * PAGE_SIZE); + enum kvm_pgtable_prot prot = pkvm_mkstate(PAGE_HYP, PKVM_PAGE_OWNED); + + return pkvm_create_mappings_locked(start, end, prot); +} + static int check_share(struct pkvm_mem_share *share) { const struct pkvm_mem_transition *tx = &share->tx; @@ -732,6 +966,94 @@ static int do_unshare(struct pkvm_mem_share *share) return WARN_ON(__do_unshare(share)); } +static int check_donation(struct pkvm_mem_donation *donation) +{ + const struct pkvm_mem_transition *tx = &donation->tx; + u64 completer_addr; + int ret; + + switch (tx->initiator.id) { + case PKVM_ID_HOST: + ret = host_request_owned_transition(&completer_addr, tx); + break; + case PKVM_ID_HYP: + ret = hyp_request_donation(&completer_addr, tx); + break; + default: + ret = -EINVAL; + } + + if (ret) + return ret; + + switch (tx->completer.id) { + case PKVM_ID_HOST: + ret = host_ack_donation(completer_addr, tx); + break; + case PKVM_ID_HYP: + ret = hyp_ack_donation(completer_addr, tx); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static int __do_donate(struct pkvm_mem_donation *donation) +{ + const struct pkvm_mem_transition *tx = &donation->tx; + u64 completer_addr; + int ret; + + switch (tx->initiator.id) { + case PKVM_ID_HOST: + ret = host_initiate_donation(&completer_addr, tx); + break; + case PKVM_ID_HYP: + ret = hyp_initiate_donation(&completer_addr, tx); + break; + default: + ret = -EINVAL; + } + + if (ret) + return ret; + + switch (tx->completer.id) { + case PKVM_ID_HOST: + ret = host_complete_donation(completer_addr, tx); + break; + case PKVM_ID_HYP: + ret = hyp_complete_donation(completer_addr, tx); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +/* + * do_donate(): + * + * The page owner transfers ownership to another component, losing access + * as a consequence. + * + * Initiator: OWNED => NOPAGE + * Completer: NOPAGE => OWNED + */ +static int do_donate(struct pkvm_mem_donation *donation) +{ + int ret; + + ret = check_donation(donation); + if (ret) + return ret; + + return WARN_ON(__do_donate(donation)); +} + int __pkvm_host_share_hyp(u64 pfn) { int ret; @@ -797,3 +1119,112 @@ int __pkvm_host_unshare_hyp(u64 pfn) return ret; } + +int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages) +{ + int ret; + u64 host_addr = hyp_pfn_to_phys(pfn); + u64 hyp_addr = (u64)__hyp_va(host_addr); + struct pkvm_mem_donation donation = { + .tx = { + .nr_pages = nr_pages, + .initiator = { + .id = PKVM_ID_HOST, + .addr = host_addr, + .host = { + .completer_addr = hyp_addr, + }, + }, + .completer = { + .id = PKVM_ID_HYP, + }, + }, + }; + + host_lock_component(); + hyp_lock_component(); + + ret = do_donate(&donation); + + hyp_unlock_component(); + host_unlock_component(); + + return ret; +} + +int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages) +{ + int ret; + u64 host_addr = hyp_pfn_to_phys(pfn); + u64 hyp_addr = (u64)__hyp_va(host_addr); + struct pkvm_mem_donation donation = { + .tx = { + .nr_pages = nr_pages, + .initiator = { + .id = PKVM_ID_HYP, + .addr = hyp_addr, + .hyp = { + .completer_addr = host_addr, + }, + }, + .completer = { + .id = PKVM_ID_HOST, + }, + }, + }; + + host_lock_component(); + hyp_lock_component(); + + ret = do_donate(&donation); + + hyp_unlock_component(); + host_unlock_component(); + + return ret; +} + +int hyp_pin_shared_mem(void *from, void *to) +{ + u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE); + u64 end = PAGE_ALIGN((u64)to); + u64 size = end - start; + int ret; + + host_lock_component(); + hyp_lock_component(); + + ret = __host_check_page_state_range(__hyp_pa(start), size, + PKVM_PAGE_SHARED_OWNED); + if (ret) + goto unlock; + + ret = __hyp_check_page_state_range(start, size, + PKVM_PAGE_SHARED_BORROWED); + if (ret) + goto unlock; + + for (cur = start; cur < end; cur += PAGE_SIZE) + hyp_page_ref_inc(hyp_virt_to_page(cur)); + +unlock: + hyp_unlock_component(); + host_unlock_component(); + + return ret; +} + +void hyp_unpin_shared_mem(void *from, void *to) +{ + u64 cur, start = ALIGN_DOWN((u64)from, PAGE_SIZE); + u64 end = PAGE_ALIGN((u64)to); + + host_lock_component(); + hyp_lock_component(); + + for (cur = start; cur < end; cur += PAGE_SIZE) + hyp_page_ref_dec(hyp_virt_to_page(cur)); + + hyp_unlock_component(); + host_unlock_component(); +} diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c index 96193cb31a39..318298eb3d6b 100644 --- a/arch/arm64/kvm/hyp/nvhe/mm.c +++ b/arch/arm64/kvm/hyp/nvhe/mm.c @@ -14,6 +14,7 @@ #include <nvhe/early_alloc.h> #include <nvhe/gfp.h> #include <nvhe/memory.h> +#include <nvhe/mem_protect.h> #include <nvhe/mm.h> #include <nvhe/spinlock.h> @@ -25,6 +26,12 @@ unsigned int hyp_memblock_nr; static u64 __io_map_base; +struct hyp_fixmap_slot { + u64 addr; + kvm_pte_t *ptep; +}; +static DEFINE_PER_CPU(struct hyp_fixmap_slot, fixmap_slots); + static int __pkvm_create_mappings(unsigned long start, unsigned long size, unsigned long phys, enum kvm_pgtable_prot prot) { @@ -129,13 +136,36 @@ int pkvm_create_mappings(void *from, void *to, enum kvm_pgtable_prot prot) return ret; } -int hyp_back_vmemmap(phys_addr_t phys, unsigned long size, phys_addr_t back) +int hyp_back_vmemmap(phys_addr_t back) { - unsigned long start, end; + unsigned long i, start, size, end = 0; + int ret; - hyp_vmemmap_range(phys, size, &start, &end); + for (i = 0; i < hyp_memblock_nr; i++) { + start = hyp_memory[i].base; + start = ALIGN_DOWN((u64)hyp_phys_to_page(start), PAGE_SIZE); + /* + * The begining of the hyp_vmemmap region for the current + * memblock may already be backed by the page backing the end + * the previous region, so avoid mapping it twice. + */ + start = max(start, end); + + end = hyp_memory[i].base + hyp_memory[i].size; + end = PAGE_ALIGN((u64)hyp_phys_to_page(end)); + if (start >= end) + continue; + + size = end - start; + ret = __pkvm_create_mappings(start, size, back, PAGE_HYP); + if (ret) + return ret; + + memset(hyp_phys_to_virt(back), 0, size); + back += size; + } - return __pkvm_create_mappings(start, end - start, back, PAGE_HYP); + return 0; } static void *__hyp_bp_vect_base; @@ -189,6 +219,102 @@ int hyp_map_vectors(void) return 0; } +void *hyp_fixmap_map(phys_addr_t phys) +{ + struct hyp_fixmap_slot *slot = this_cpu_ptr(&fixmap_slots); + kvm_pte_t pte, *ptep = slot->ptep; + + pte = *ptep; + pte &= ~kvm_phys_to_pte(KVM_PHYS_INVALID); + pte |= kvm_phys_to_pte(phys) | KVM_PTE_VALID; + WRITE_ONCE(*ptep, pte); + dsb(ishst); + + return (void *)slot->addr; +} + +static void fixmap_clear_slot(struct hyp_fixmap_slot *slot) +{ + kvm_pte_t *ptep = slot->ptep; + u64 addr = slot->addr; + + WRITE_ONCE(*ptep, *ptep & ~KVM_PTE_VALID); + + /* + * Irritatingly, the architecture requires that we use inner-shareable + * broadcast TLB invalidation here in case another CPU speculates + * through our fixmap and decides to create an "amalagamation of the + * values held in the TLB" due to the apparent lack of a + * break-before-make sequence. + * + * https://lore.kernel.org/kvm/20221017115209.2099-1-will@kernel.org/T/#mf10dfbaf1eaef9274c581b81c53758918c1d0f03 + */ + dsb(ishst); + __tlbi_level(vale2is, __TLBI_VADDR(addr, 0), (KVM_PGTABLE_MAX_LEVELS - 1)); + dsb(ish); + isb(); +} + +void hyp_fixmap_unmap(void) +{ + fixmap_clear_slot(this_cpu_ptr(&fixmap_slots)); +} + +static int __create_fixmap_slot_cb(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) +{ + struct hyp_fixmap_slot *slot = per_cpu_ptr(&fixmap_slots, (u64)ctx->arg); + + if (!kvm_pte_valid(ctx->old) || ctx->level != KVM_PGTABLE_MAX_LEVELS - 1) + return -EINVAL; + + slot->addr = ctx->addr; + slot->ptep = ctx->ptep; + + /* + * Clear the PTE, but keep the page-table page refcount elevated to + * prevent it from ever being freed. This lets us manipulate the PTEs + * by hand safely without ever needing to allocate memory. + */ + fixmap_clear_slot(slot); + + return 0; +} + +static int create_fixmap_slot(u64 addr, u64 cpu) +{ + struct kvm_pgtable_walker walker = { + .cb = __create_fixmap_slot_cb, + .flags = KVM_PGTABLE_WALK_LEAF, + .arg = (void *)cpu, + }; + + return kvm_pgtable_walk(&pkvm_pgtable, addr, PAGE_SIZE, &walker); +} + +int hyp_create_pcpu_fixmap(void) +{ + unsigned long addr, i; + int ret; + + for (i = 0; i < hyp_nr_cpus; i++) { + ret = pkvm_alloc_private_va_range(PAGE_SIZE, &addr); + if (ret) + return ret; + + ret = kvm_pgtable_hyp_map(&pkvm_pgtable, addr, PAGE_SIZE, + __hyp_pa(__hyp_bss_start), PAGE_HYP); + if (ret) + return ret; + + ret = create_fixmap_slot(addr, i); + if (ret) + return ret; + } + + return 0; +} + int hyp_create_idmap(u32 hyp_va_bits) { unsigned long start, end; @@ -213,3 +339,36 @@ int hyp_create_idmap(u32 hyp_va_bits) return __pkvm_create_mappings(start, end - start, start, PAGE_HYP_EXEC); } + +static void *admit_host_page(void *arg) +{ + struct kvm_hyp_memcache *host_mc = arg; + + if (!host_mc->nr_pages) + return NULL; + + /* + * The host still owns the pages in its memcache, so we need to go + * through a full host-to-hyp donation cycle to change it. Fortunately, + * __pkvm_host_donate_hyp() takes care of races for us, so if it + * succeeds we're good to go. + */ + if (__pkvm_host_donate_hyp(hyp_phys_to_pfn(host_mc->head), 1)) + return NULL; + + return pop_hyp_memcache(host_mc, hyp_phys_to_virt); +} + +/* Refill our local memcache by poping pages from the one provided by the host. */ +int refill_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages, + struct kvm_hyp_memcache *host_mc) +{ + struct kvm_hyp_memcache tmp = *host_mc; + int ret; + + ret = __topup_hyp_memcache(mc, min_pages, admit_host_page, + hyp_virt_to_phys, &tmp); + *host_mc = tmp; + + return ret; +} diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c index d40f0b30b534..803ba3222e75 100644 --- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c +++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c @@ -93,11 +93,16 @@ static inline struct hyp_page *node_to_page(struct list_head *node) static void __hyp_attach_page(struct hyp_pool *pool, struct hyp_page *p) { + phys_addr_t phys = hyp_page_to_phys(p); unsigned short order = p->order; struct hyp_page *buddy; memset(hyp_page_to_virt(p), 0, PAGE_SIZE << p->order); + /* Skip coalescing for 'external' pages being freed into the pool. */ + if (phys < pool->range_start || phys >= pool->range_end) + goto insert; + /* * Only the first struct hyp_page of a high-order page (otherwise known * as the 'head') should have p->order set. The non-head pages should @@ -116,6 +121,7 @@ static void __hyp_attach_page(struct hyp_pool *pool, p = min(p, buddy); } +insert: /* Mark the new head, and insert it */ p->order = order; page_add_to_list(p, &pool->free_area[order]); @@ -144,25 +150,6 @@ static struct hyp_page *__hyp_extract_page(struct hyp_pool *pool, return p; } -static inline void hyp_page_ref_inc(struct hyp_page *p) -{ - BUG_ON(p->refcount == USHRT_MAX); - p->refcount++; -} - -static inline int hyp_page_ref_dec_and_test(struct hyp_page *p) -{ - BUG_ON(!p->refcount); - p->refcount--; - return (p->refcount == 0); -} - -static inline void hyp_set_page_refcounted(struct hyp_page *p) -{ - BUG_ON(p->refcount); - p->refcount = 1; -} - static void __hyp_put_page(struct hyp_pool *pool, struct hyp_page *p) { if (hyp_page_ref_dec_and_test(p)) @@ -249,10 +236,8 @@ int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages, /* Init the vmemmap portion */ p = hyp_phys_to_page(phys); - for (i = 0; i < nr_pages; i++) { - p[i].order = 0; + for (i = 0; i < nr_pages; i++) hyp_set_page_refcounted(&p[i]); - } /* Attach the unused pages to the buddy tree */ for (i = reserved_pages; i < nr_pages; i++) diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 85d3b7ae720f..a06ece14a6d8 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -7,8 +7,17 @@ #include <linux/kvm_host.h> #include <linux/mm.h> #include <nvhe/fixed_config.h> +#include <nvhe/mem_protect.h> +#include <nvhe/memory.h> +#include <nvhe/pkvm.h> #include <nvhe/trap_handler.h> +/* Used by icache_is_vpipt(). */ +unsigned long __icache_flags; + +/* Used by kvm_get_vttbr(). */ +unsigned int kvm_arm_vmid_bits; + /* * Set trap register values based on features in ID_AA64PFR0. */ @@ -183,3 +192,430 @@ void __pkvm_vcpu_init_traps(struct kvm_vcpu *vcpu) pvm_init_traps_aa64mmfr0(vcpu); pvm_init_traps_aa64mmfr1(vcpu); } + +/* + * Start the VM table handle at the offset defined instead of at 0. + * Mainly for sanity checking and debugging. + */ +#define HANDLE_OFFSET 0x1000 + +static unsigned int vm_handle_to_idx(pkvm_handle_t handle) +{ + return handle - HANDLE_OFFSET; +} + +static pkvm_handle_t idx_to_vm_handle(unsigned int idx) +{ + return idx + HANDLE_OFFSET; +} + +/* + * Spinlock for protecting state related to the VM table. Protects writes + * to 'vm_table' and 'nr_table_entries' as well as reads and writes to + * 'last_hyp_vcpu_lookup'. + */ +static DEFINE_HYP_SPINLOCK(vm_table_lock); + +/* + * The table of VM entries for protected VMs in hyp. + * Allocated at hyp initialization and setup. + */ +static struct pkvm_hyp_vm **vm_table; + +void pkvm_hyp_vm_table_init(void *tbl) +{ + WARN_ON(vm_table); + vm_table = tbl; +} + +/* + * Return the hyp vm structure corresponding to the handle. + */ +static struct pkvm_hyp_vm *get_vm_by_handle(pkvm_handle_t handle) +{ + unsigned int idx = vm_handle_to_idx(handle); + + if (unlikely(idx >= KVM_MAX_PVMS)) + return NULL; + + return vm_table[idx]; +} + +struct pkvm_hyp_vcpu *pkvm_load_hyp_vcpu(pkvm_handle_t handle, + unsigned int vcpu_idx) +{ + struct pkvm_hyp_vcpu *hyp_vcpu = NULL; + struct pkvm_hyp_vm *hyp_vm; + + hyp_spin_lock(&vm_table_lock); + hyp_vm = get_vm_by_handle(handle); + if (!hyp_vm || hyp_vm->nr_vcpus <= vcpu_idx) + goto unlock; + + hyp_vcpu = hyp_vm->vcpus[vcpu_idx]; + hyp_page_ref_inc(hyp_virt_to_page(hyp_vm)); +unlock: + hyp_spin_unlock(&vm_table_lock); + return hyp_vcpu; +} + +void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu) +{ + struct pkvm_hyp_vm *hyp_vm = pkvm_hyp_vcpu_to_hyp_vm(hyp_vcpu); + + hyp_spin_lock(&vm_table_lock); + hyp_page_ref_dec(hyp_virt_to_page(hyp_vm)); + hyp_spin_unlock(&vm_table_lock); +} + +static void unpin_host_vcpu(struct kvm_vcpu *host_vcpu) +{ + if (host_vcpu) + hyp_unpin_shared_mem(host_vcpu, host_vcpu + 1); +} + +static void unpin_host_vcpus(struct pkvm_hyp_vcpu *hyp_vcpus[], + unsigned int nr_vcpus) +{ + int i; + + for (i = 0; i < nr_vcpus; i++) + unpin_host_vcpu(hyp_vcpus[i]->host_vcpu); +} + +static void init_pkvm_hyp_vm(struct kvm *host_kvm, struct pkvm_hyp_vm *hyp_vm, + unsigned int nr_vcpus) +{ + hyp_vm->host_kvm = host_kvm; + hyp_vm->kvm.created_vcpus = nr_vcpus; + hyp_vm->kvm.arch.vtcr = host_mmu.arch.vtcr; +} + +static int init_pkvm_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu, + struct pkvm_hyp_vm *hyp_vm, + struct kvm_vcpu *host_vcpu, + unsigned int vcpu_idx) +{ + int ret = 0; + + if (hyp_pin_shared_mem(host_vcpu, host_vcpu + 1)) + return -EBUSY; + + if (host_vcpu->vcpu_idx != vcpu_idx) { + ret = -EINVAL; + goto done; + } + + hyp_vcpu->host_vcpu = host_vcpu; + + hyp_vcpu->vcpu.kvm = &hyp_vm->kvm; + hyp_vcpu->vcpu.vcpu_id = READ_ONCE(host_vcpu->vcpu_id); + hyp_vcpu->vcpu.vcpu_idx = vcpu_idx; + + hyp_vcpu->vcpu.arch.hw_mmu = &hyp_vm->kvm.arch.mmu; + hyp_vcpu->vcpu.arch.cflags = READ_ONCE(host_vcpu->arch.cflags); +done: + if (ret) + unpin_host_vcpu(host_vcpu); + return ret; +} + +static int find_free_vm_table_entry(struct kvm *host_kvm) +{ + int i; + + for (i = 0; i < KVM_MAX_PVMS; ++i) { + if (!vm_table[i]) + return i; + } + + return -ENOMEM; +} + +/* + * Allocate a VM table entry and insert a pointer to the new vm. + * + * Return a unique handle to the protected VM on success, + * negative error code on failure. + */ +static pkvm_handle_t insert_vm_table_entry(struct kvm *host_kvm, + struct pkvm_hyp_vm *hyp_vm) +{ + struct kvm_s2_mmu *mmu = &hyp_vm->kvm.arch.mmu; + int idx; + + hyp_assert_lock_held(&vm_table_lock); + + /* + * Initializing protected state might have failed, yet a malicious + * host could trigger this function. Thus, ensure that 'vm_table' + * exists. + */ + if (unlikely(!vm_table)) + return -EINVAL; + + idx = find_free_vm_table_entry(host_kvm); + if (idx < 0) + return idx; + + hyp_vm->kvm.arch.pkvm.handle = idx_to_vm_handle(idx); + + /* VMID 0 is reserved for the host */ + atomic64_set(&mmu->vmid.id, idx + 1); + + mmu->arch = &hyp_vm->kvm.arch; + mmu->pgt = &hyp_vm->pgt; + + vm_table[idx] = hyp_vm; + return hyp_vm->kvm.arch.pkvm.handle; +} + +/* + * Deallocate and remove the VM table entry corresponding to the handle. + */ +static void remove_vm_table_entry(pkvm_handle_t handle) +{ + hyp_assert_lock_held(&vm_table_lock); + vm_table[vm_handle_to_idx(handle)] = NULL; +} + +static size_t pkvm_get_hyp_vm_size(unsigned int nr_vcpus) +{ + return size_add(sizeof(struct pkvm_hyp_vm), + size_mul(sizeof(struct pkvm_hyp_vcpu *), nr_vcpus)); +} + +static void *map_donated_memory_noclear(unsigned long host_va, size_t size) +{ + void *va = (void *)kern_hyp_va(host_va); + + if (!PAGE_ALIGNED(va)) + return NULL; + + if (__pkvm_host_donate_hyp(hyp_virt_to_pfn(va), + PAGE_ALIGN(size) >> PAGE_SHIFT)) + return NULL; + + return va; +} + +static void *map_donated_memory(unsigned long host_va, size_t size) +{ + void *va = map_donated_memory_noclear(host_va, size); + + if (va) + memset(va, 0, size); + + return va; +} + +static void __unmap_donated_memory(void *va, size_t size) +{ + WARN_ON(__pkvm_hyp_donate_host(hyp_virt_to_pfn(va), + PAGE_ALIGN(size) >> PAGE_SHIFT)); +} + +static void unmap_donated_memory(void *va, size_t size) +{ + if (!va) + return; + + memset(va, 0, size); + __unmap_donated_memory(va, size); +} + +static void unmap_donated_memory_noclear(void *va, size_t size) +{ + if (!va) + return; + + __unmap_donated_memory(va, size); +} + +/* + * Initialize the hypervisor copy of the protected VM state using the + * memory donated by the host. + * + * Unmaps the donated memory from the host at stage 2. + * + * host_kvm: A pointer to the host's struct kvm. + * vm_hva: The host va of the area being donated for the VM state. + * Must be page aligned. + * pgd_hva: The host va of the area being donated for the stage-2 PGD for + * the VM. Must be page aligned. Its size is implied by the VM's + * VTCR. + * + * Return a unique handle to the protected VM on success, + * negative error code on failure. + */ +int __pkvm_init_vm(struct kvm *host_kvm, unsigned long vm_hva, + unsigned long pgd_hva) +{ + struct pkvm_hyp_vm *hyp_vm = NULL; + size_t vm_size, pgd_size; + unsigned int nr_vcpus; + void *pgd = NULL; + int ret; + + ret = hyp_pin_shared_mem(host_kvm, host_kvm + 1); + if (ret) + return ret; + + nr_vcpus = READ_ONCE(host_kvm->created_vcpus); + if (nr_vcpus < 1) { + ret = -EINVAL; + goto err_unpin_kvm; + } + + vm_size = pkvm_get_hyp_vm_size(nr_vcpus); + pgd_size = kvm_pgtable_stage2_pgd_size(host_mmu.arch.vtcr); + + ret = -ENOMEM; + + hyp_vm = map_donated_memory(vm_hva, vm_size); + if (!hyp_vm) + goto err_remove_mappings; + + pgd = map_donated_memory_noclear(pgd_hva, pgd_size); + if (!pgd) + goto err_remove_mappings; + + init_pkvm_hyp_vm(host_kvm, hyp_vm, nr_vcpus); + + hyp_spin_lock(&vm_table_lock); + ret = insert_vm_table_entry(host_kvm, hyp_vm); + if (ret < 0) + goto err_unlock; + + ret = kvm_guest_prepare_stage2(hyp_vm, pgd); + if (ret) + goto err_remove_vm_table_entry; + hyp_spin_unlock(&vm_table_lock); + + return hyp_vm->kvm.arch.pkvm.handle; + +err_remove_vm_table_entry: + remove_vm_table_entry(hyp_vm->kvm.arch.pkvm.handle); +err_unlock: + hyp_spin_unlock(&vm_table_lock); +err_remove_mappings: + unmap_donated_memory(hyp_vm, vm_size); + unmap_donated_memory(pgd, pgd_size); +err_unpin_kvm: + hyp_unpin_shared_mem(host_kvm, host_kvm + 1); + return ret; +} + +/* + * Initialize the hypervisor copy of the protected vCPU state using the + * memory donated by the host. + * + * handle: The handle for the protected vm. + * host_vcpu: A pointer to the corresponding host vcpu. + * vcpu_hva: The host va of the area being donated for the vcpu state. + * Must be page aligned. The size of the area must be equal to + * the page-aligned size of 'struct pkvm_hyp_vcpu'. + * Return 0 on success, negative error code on failure. + */ +int __pkvm_init_vcpu(pkvm_handle_t handle, struct kvm_vcpu *host_vcpu, + unsigned long vcpu_hva) +{ + struct pkvm_hyp_vcpu *hyp_vcpu; + struct pkvm_hyp_vm *hyp_vm; + unsigned int idx; + int ret; + + hyp_vcpu = map_donated_memory(vcpu_hva, sizeof(*hyp_vcpu)); + if (!hyp_vcpu) + return -ENOMEM; + + hyp_spin_lock(&vm_table_lock); + + hyp_vm = get_vm_by_handle(handle); + if (!hyp_vm) { + ret = -ENOENT; + goto unlock; + } + + idx = hyp_vm->nr_vcpus; + if (idx >= hyp_vm->kvm.created_vcpus) { + ret = -EINVAL; + goto unlock; + } + + ret = init_pkvm_hyp_vcpu(hyp_vcpu, hyp_vm, host_vcpu, idx); + if (ret) + goto unlock; + + hyp_vm->vcpus[idx] = hyp_vcpu; + hyp_vm->nr_vcpus++; +unlock: + hyp_spin_unlock(&vm_table_lock); + + if (ret) + unmap_donated_memory(hyp_vcpu, sizeof(*hyp_vcpu)); + + return ret; +} + +static void +teardown_donated_memory(struct kvm_hyp_memcache *mc, void *addr, size_t size) +{ + size = PAGE_ALIGN(size); + memset(addr, 0, size); + + for (void *start = addr; start < addr + size; start += PAGE_SIZE) + push_hyp_memcache(mc, start, hyp_virt_to_phys); + + unmap_donated_memory_noclear(addr, size); +} + +int __pkvm_teardown_vm(pkvm_handle_t handle) +{ + struct kvm_hyp_memcache *mc; + struct pkvm_hyp_vm *hyp_vm; + struct kvm *host_kvm; + unsigned int idx; + size_t vm_size; + int err; + + hyp_spin_lock(&vm_table_lock); + hyp_vm = get_vm_by_handle(handle); + if (!hyp_vm) { + err = -ENOENT; + goto err_unlock; + } + + if (WARN_ON(hyp_page_count(hyp_vm))) { + err = -EBUSY; + goto err_unlock; + } + + host_kvm = hyp_vm->host_kvm; + + /* Ensure the VMID is clean before it can be reallocated */ + __kvm_tlb_flush_vmid(&hyp_vm->kvm.arch.mmu); + remove_vm_table_entry(handle); + hyp_spin_unlock(&vm_table_lock); + + /* Reclaim guest pages (including page-table pages) */ + mc = &host_kvm->arch.pkvm.teardown_mc; + reclaim_guest_pages(hyp_vm, mc); + unpin_host_vcpus(hyp_vm->vcpus, hyp_vm->nr_vcpus); + + /* Push the metadata pages to the teardown memcache */ + for (idx = 0; idx < hyp_vm->nr_vcpus; ++idx) { + struct pkvm_hyp_vcpu *hyp_vcpu = hyp_vm->vcpus[idx]; + + teardown_donated_memory(mc, hyp_vcpu, sizeof(*hyp_vcpu)); + } + + vm_size = pkvm_get_hyp_vm_size(hyp_vm->kvm.created_vcpus); + teardown_donated_memory(mc, hyp_vm, vm_size); + hyp_unpin_shared_mem(host_kvm, host_kvm + 1); + return 0; + +err_unlock: + hyp_spin_unlock(&vm_table_lock); + return err; +} diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c index e8d4ea2fcfa0..110f04627785 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -16,6 +16,7 @@ #include <nvhe/memory.h> #include <nvhe/mem_protect.h> #include <nvhe/mm.h> +#include <nvhe/pkvm.h> #include <nvhe/trap_handler.h> unsigned long hyp_nr_cpus; @@ -24,6 +25,7 @@ unsigned long hyp_nr_cpus; (unsigned long)__per_cpu_start) static void *vmemmap_base; +static void *vm_table_base; static void *hyp_pgt_base; static void *host_s2_pgt_base; static struct kvm_pgtable_mm_ops pkvm_pgtable_mm_ops; @@ -31,16 +33,20 @@ static struct hyp_pool hpool; static int divide_memory_pool(void *virt, unsigned long size) { - unsigned long vstart, vend, nr_pages; + unsigned long nr_pages; hyp_early_alloc_init(virt, size); - hyp_vmemmap_range(__hyp_pa(virt), size, &vstart, &vend); - nr_pages = (vend - vstart) >> PAGE_SHIFT; + nr_pages = hyp_vmemmap_pages(sizeof(struct hyp_page)); vmemmap_base = hyp_early_alloc_contig(nr_pages); if (!vmemmap_base) return -ENOMEM; + nr_pages = hyp_vm_table_pages(); + vm_table_base = hyp_early_alloc_contig(nr_pages); + if (!vm_table_base) + return -ENOMEM; + nr_pages = hyp_s1_pgtable_pages(); hyp_pgt_base = hyp_early_alloc_contig(nr_pages); if (!hyp_pgt_base) @@ -78,7 +84,7 @@ static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size, if (ret) return ret; - ret = hyp_back_vmemmap(phys, size, hyp_virt_to_phys(vmemmap_base)); + ret = hyp_back_vmemmap(hyp_virt_to_phys(vmemmap_base)); if (ret) return ret; @@ -138,20 +144,17 @@ static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size, } /* - * Map the host's .bss and .rodata sections RO in the hypervisor, but - * transfer the ownership from the host to the hypervisor itself to - * make sure it can't be donated or shared with another entity. + * Map the host sections RO in the hypervisor, but transfer the + * ownership from the host to the hypervisor itself to make sure they + * can't be donated or shared with another entity. * * The ownership transition requires matching changes in the host * stage-2. This will be done later (see finalize_host_mappings()) once * the hyp_vmemmap is addressable. */ prot = pkvm_mkstate(PAGE_HYP_RO, PKVM_PAGE_SHARED_OWNED); - ret = pkvm_create_mappings(__start_rodata, __end_rodata, prot); - if (ret) - return ret; - - ret = pkvm_create_mappings(__hyp_bss_end, __bss_stop, prot); + ret = pkvm_create_mappings(&kvm_vgic_global_state, + &kvm_vgic_global_state + 1, prot); if (ret) return ret; @@ -186,33 +189,20 @@ static void hpool_put_page(void *addr) hyp_put_page(&hpool, addr); } -static int finalize_host_mappings_walker(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg) +static int fix_host_ownership_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct kvm_pgtable_mm_ops *mm_ops = arg; enum kvm_pgtable_prot prot; enum pkvm_page_state state; - kvm_pte_t pte = *ptep; phys_addr_t phys; - if (!kvm_pte_valid(pte)) + if (!kvm_pte_valid(ctx->old)) return 0; - /* - * Fix-up the refcount for the page-table pages as the early allocator - * was unable to access the hyp_vmemmap and so the buddy allocator has - * initialised the refcount to '1'. - */ - mm_ops->get_page(ptep); - if (flag != KVM_PGTABLE_WALK_LEAF) - return 0; - - if (level != (KVM_PGTABLE_MAX_LEVELS - 1)) + if (ctx->level != (KVM_PGTABLE_MAX_LEVELS - 1)) return -EINVAL; - phys = kvm_pte_to_phys(pte); + phys = kvm_pte_to_phys(ctx->old); if (!addr_is_memory(phys)) return -EINVAL; @@ -220,10 +210,10 @@ static int finalize_host_mappings_walker(u64 addr, u64 end, u32 level, * Adjust the host stage-2 mappings to match the ownership attributes * configured in the hypervisor stage-1. */ - state = pkvm_getstate(kvm_pgtable_hyp_pte_prot(pte)); + state = pkvm_getstate(kvm_pgtable_hyp_pte_prot(ctx->old)); switch (state) { case PKVM_PAGE_OWNED: - return host_stage2_set_owner_locked(phys, PAGE_SIZE, pkvm_hyp_id); + return host_stage2_set_owner_locked(phys, PAGE_SIZE, PKVM_ID_HYP); case PKVM_PAGE_SHARED_OWNED: prot = pkvm_mkstate(PKVM_HOST_MEM_PROT, PKVM_PAGE_SHARED_BORROWED); break; @@ -237,12 +227,25 @@ static int finalize_host_mappings_walker(u64 addr, u64 end, u32 level, return host_stage2_idmap_locked(phys, PAGE_SIZE, prot); } -static int finalize_host_mappings(void) +static int fix_hyp_pgtable_refcnt_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) +{ + /* + * Fix-up the refcount for the page-table pages as the early allocator + * was unable to access the hyp_vmemmap and so the buddy allocator has + * initialised the refcount to '1'. + */ + if (kvm_pte_valid(ctx->old)) + ctx->mm_ops->get_page(ctx->ptep); + + return 0; +} + +static int fix_host_ownership(void) { struct kvm_pgtable_walker walker = { - .cb = finalize_host_mappings_walker, - .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST, - .arg = pkvm_pgtable.mm_ops, + .cb = fix_host_ownership_walker, + .flags = KVM_PGTABLE_WALK_LEAF, }; int i, ret; @@ -258,6 +261,18 @@ static int finalize_host_mappings(void) return 0; } +static int fix_hyp_pgtable_refcnt(void) +{ + struct kvm_pgtable_walker walker = { + .cb = fix_hyp_pgtable_refcnt_walker, + .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST, + .arg = pkvm_pgtable.mm_ops, + }; + + return kvm_pgtable_walk(&pkvm_pgtable, 0, BIT(pkvm_pgtable.ia_bits), + &walker); +} + void __noreturn __pkvm_init_finalise(void) { struct kvm_host_data *host_data = this_cpu_ptr(&kvm_host_data); @@ -287,10 +302,19 @@ void __noreturn __pkvm_init_finalise(void) }; pkvm_pgtable.mm_ops = &pkvm_pgtable_mm_ops; - ret = finalize_host_mappings(); + ret = fix_host_ownership(); + if (ret) + goto out; + + ret = fix_hyp_pgtable_refcnt(); + if (ret) + goto out; + + ret = hyp_create_pcpu_fixmap(); if (ret) goto out; + pkvm_hyp_vm_table_init(vm_table_base); out: /* * We tail-called to here from handle___pkvm_init() and will not return, diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index cdf8e76b0be1..b11cf2c618a6 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -49,35 +49,38 @@ #define KVM_INVALID_PTE_OWNER_MASK GENMASK(9, 2) #define KVM_MAX_OWNER_ID 1 +/* + * Used to indicate a pte for which a 'break-before-make' sequence is in + * progress. + */ +#define KVM_INVALID_PTE_LOCKED BIT(10) + struct kvm_pgtable_walk_data { - struct kvm_pgtable *pgt; struct kvm_pgtable_walker *walker; u64 addr; u64 end; }; -#define KVM_PHYS_INVALID (-1ULL) - static bool kvm_phys_is_valid(u64 phys) { return phys < BIT(id_aa64mmfr0_parange_to_phys_shift(ID_AA64MMFR0_EL1_PARANGE_MAX)); } -static bool kvm_block_mapping_supported(u64 addr, u64 end, u64 phys, u32 level) +static bool kvm_block_mapping_supported(const struct kvm_pgtable_visit_ctx *ctx, u64 phys) { - u64 granule = kvm_granule_size(level); + u64 granule = kvm_granule_size(ctx->level); - if (!kvm_level_supports_block_mapping(level)) + if (!kvm_level_supports_block_mapping(ctx->level)) return false; - if (granule > (end - addr)) + if (granule > (ctx->end - ctx->addr)) return false; if (kvm_phys_is_valid(phys) && !IS_ALIGNED(phys, granule)) return false; - return IS_ALIGNED(addr, granule); + return IS_ALIGNED(ctx->addr, granule); } static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level) @@ -88,7 +91,7 @@ static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level) return (data->addr >> shift) & mask; } -static u32 __kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr) +static u32 kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr) { u64 shift = kvm_granule_shift(pgt->start_level - 1); /* May underflow */ u64 mask = BIT(pgt->ia_bits) - 1; @@ -96,11 +99,6 @@ static u32 __kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr) return (addr & mask) >> shift; } -static u32 kvm_pgd_page_idx(struct kvm_pgtable_walk_data *data) -{ - return __kvm_pgd_page_idx(data->pgt, data->addr); -} - static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level) { struct kvm_pgtable pgt = { @@ -108,7 +106,7 @@ static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level) .start_level = start_level, }; - return __kvm_pgd_page_idx(&pgt, -1ULL) + 1; + return kvm_pgd_page_idx(&pgt, -1ULL) + 1; } static bool kvm_pte_table(kvm_pte_t pte, u32 level) @@ -122,16 +120,6 @@ static bool kvm_pte_table(kvm_pte_t pte, u32 level) return FIELD_GET(KVM_PTE_TYPE, pte) == KVM_PTE_TYPE_TABLE; } -static kvm_pte_t kvm_phys_to_pte(u64 pa) -{ - kvm_pte_t pte = pa & KVM_PTE_ADDR_MASK; - - if (PAGE_SHIFT == 16) - pte |= FIELD_PREP(KVM_PTE_ADDR_51_48, pa >> 48); - - return pte; -} - static kvm_pte_t *kvm_pte_follow(kvm_pte_t pte, struct kvm_pgtable_mm_ops *mm_ops) { return mm_ops->phys_to_virt(kvm_pte_to_phys(pte)); @@ -142,16 +130,13 @@ static void kvm_clear_pte(kvm_pte_t *ptep) WRITE_ONCE(*ptep, 0); } -static void kvm_set_table_pte(kvm_pte_t *ptep, kvm_pte_t *childp, - struct kvm_pgtable_mm_ops *mm_ops) +static kvm_pte_t kvm_init_table_pte(kvm_pte_t *childp, struct kvm_pgtable_mm_ops *mm_ops) { - kvm_pte_t old = *ptep, pte = kvm_phys_to_pte(mm_ops->virt_to_phys(childp)); + kvm_pte_t pte = kvm_phys_to_pte(mm_ops->virt_to_phys(childp)); pte |= FIELD_PREP(KVM_PTE_TYPE, KVM_PTE_TYPE_TABLE); pte |= KVM_PTE_VALID; - - WARN_ON(kvm_pte_valid(old)); - smp_store_release(ptep, pte); + return pte; } static kvm_pte_t kvm_init_valid_leaf_pte(u64 pa, kvm_pte_t attr, u32 level) @@ -172,36 +157,47 @@ static kvm_pte_t kvm_init_invalid_leaf_owner(u8 owner_id) return FIELD_PREP(KVM_INVALID_PTE_OWNER_MASK, owner_id); } -static int kvm_pgtable_visitor_cb(struct kvm_pgtable_walk_data *data, u64 addr, - u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag) +static int kvm_pgtable_visitor_cb(struct kvm_pgtable_walk_data *data, + const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { struct kvm_pgtable_walker *walker = data->walker; - return walker->cb(addr, data->end, level, ptep, flag, walker->arg); + + /* Ensure the appropriate lock is held (e.g. RCU lock for stage-2 MMU) */ + WARN_ON_ONCE(kvm_pgtable_walk_shared(ctx) && !kvm_pgtable_walk_lock_held()); + return walker->cb(ctx, visit); } static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data, - kvm_pte_t *pgtable, u32 level); + struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, u32 level); static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data, - kvm_pte_t *ptep, u32 level) + struct kvm_pgtable_mm_ops *mm_ops, + kvm_pteref_t pteref, u32 level) { - int ret = 0; - u64 addr = data->addr; - kvm_pte_t *childp, pte = *ptep; - bool table = kvm_pte_table(pte, level); enum kvm_pgtable_walk_flags flags = data->walker->flags; + kvm_pte_t *ptep = kvm_dereference_pteref(data->walker, pteref); + struct kvm_pgtable_visit_ctx ctx = { + .ptep = ptep, + .old = READ_ONCE(*ptep), + .arg = data->walker->arg, + .mm_ops = mm_ops, + .addr = data->addr, + .end = data->end, + .level = level, + .flags = flags, + }; + int ret = 0; + kvm_pteref_t childp; + bool table = kvm_pte_table(ctx.old, level); - if (table && (flags & KVM_PGTABLE_WALK_TABLE_PRE)) { - ret = kvm_pgtable_visitor_cb(data, addr, level, ptep, - KVM_PGTABLE_WALK_TABLE_PRE); - } + if (table && (ctx.flags & KVM_PGTABLE_WALK_TABLE_PRE)) + ret = kvm_pgtable_visitor_cb(data, &ctx, KVM_PGTABLE_WALK_TABLE_PRE); - if (!table && (flags & KVM_PGTABLE_WALK_LEAF)) { - ret = kvm_pgtable_visitor_cb(data, addr, level, ptep, - KVM_PGTABLE_WALK_LEAF); - pte = *ptep; - table = kvm_pte_table(pte, level); + if (!table && (ctx.flags & KVM_PGTABLE_WALK_LEAF)) { + ret = kvm_pgtable_visitor_cb(data, &ctx, KVM_PGTABLE_WALK_LEAF); + ctx.old = READ_ONCE(*ptep); + table = kvm_pte_table(ctx.old, level); } if (ret) @@ -213,22 +209,20 @@ static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data, goto out; } - childp = kvm_pte_follow(pte, data->pgt->mm_ops); - ret = __kvm_pgtable_walk(data, childp, level + 1); + childp = (kvm_pteref_t)kvm_pte_follow(ctx.old, mm_ops); + ret = __kvm_pgtable_walk(data, mm_ops, childp, level + 1); if (ret) goto out; - if (flags & KVM_PGTABLE_WALK_TABLE_POST) { - ret = kvm_pgtable_visitor_cb(data, addr, level, ptep, - KVM_PGTABLE_WALK_TABLE_POST); - } + if (ctx.flags & KVM_PGTABLE_WALK_TABLE_POST) + ret = kvm_pgtable_visitor_cb(data, &ctx, KVM_PGTABLE_WALK_TABLE_POST); out: return ret; } static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data, - kvm_pte_t *pgtable, u32 level) + struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, u32 level) { u32 idx; int ret = 0; @@ -237,12 +231,12 @@ static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data, return -EINVAL; for (idx = kvm_pgtable_idx(data, level); idx < PTRS_PER_PTE; ++idx) { - kvm_pte_t *ptep = &pgtable[idx]; + kvm_pteref_t pteref = &pgtable[idx]; if (data->addr >= data->end) break; - ret = __kvm_pgtable_visit(data, ptep, level); + ret = __kvm_pgtable_visit(data, mm_ops, pteref, level); if (ret) break; } @@ -250,11 +244,10 @@ static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data, return ret; } -static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data) +static int _kvm_pgtable_walk(struct kvm_pgtable *pgt, struct kvm_pgtable_walk_data *data) { u32 idx; int ret = 0; - struct kvm_pgtable *pgt = data->pgt; u64 limit = BIT(pgt->ia_bits); if (data->addr > limit || data->end > limit) @@ -263,10 +256,10 @@ static int _kvm_pgtable_walk(struct kvm_pgtable_walk_data *data) if (!pgt->pgd) return -EINVAL; - for (idx = kvm_pgd_page_idx(data); data->addr < data->end; ++idx) { - kvm_pte_t *ptep = &pgt->pgd[idx * PTRS_PER_PTE]; + for (idx = kvm_pgd_page_idx(pgt, data->addr); data->addr < data->end; ++idx) { + kvm_pteref_t pteref = &pgt->pgd[idx * PTRS_PER_PTE]; - ret = __kvm_pgtable_walk(data, ptep, pgt->start_level); + ret = __kvm_pgtable_walk(data, pgt->mm_ops, pteref, pgt->start_level); if (ret) break; } @@ -278,13 +271,20 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, struct kvm_pgtable_walker *walker) { struct kvm_pgtable_walk_data walk_data = { - .pgt = pgt, .addr = ALIGN_DOWN(addr, PAGE_SIZE), .end = PAGE_ALIGN(walk_data.addr + size), .walker = walker, }; + int r; - return _kvm_pgtable_walk(&walk_data); + r = kvm_pgtable_walk_begin(walker); + if (r) + return r; + + r = _kvm_pgtable_walk(pgt, &walk_data); + kvm_pgtable_walk_end(walker); + + return r; } struct leaf_walk_data { @@ -292,13 +292,13 @@ struct leaf_walk_data { u32 level; }; -static int leaf_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, void * const arg) +static int leaf_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct leaf_walk_data *data = arg; + struct leaf_walk_data *data = ctx->arg; - data->pte = *ptep; - data->level = level; + data->pte = ctx->old; + data->level = ctx->level; return 0; } @@ -329,7 +329,6 @@ int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, struct hyp_map_data { u64 phys; kvm_pte_t attr; - struct kvm_pgtable_mm_ops *mm_ops; }; static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep) @@ -383,47 +382,49 @@ enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte) return prot; } -static bool hyp_map_walker_try_leaf(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, struct hyp_map_data *data) +static bool hyp_map_walker_try_leaf(const struct kvm_pgtable_visit_ctx *ctx, + struct hyp_map_data *data) { - kvm_pte_t new, old = *ptep; - u64 granule = kvm_granule_size(level), phys = data->phys; + kvm_pte_t new; + u64 granule = kvm_granule_size(ctx->level), phys = data->phys; - if (!kvm_block_mapping_supported(addr, end, phys, level)) + if (!kvm_block_mapping_supported(ctx, phys)) return false; data->phys += granule; - new = kvm_init_valid_leaf_pte(phys, data->attr, level); - if (old == new) + new = kvm_init_valid_leaf_pte(phys, data->attr, ctx->level); + if (ctx->old == new) return true; - if (!kvm_pte_valid(old)) - data->mm_ops->get_page(ptep); - else if (WARN_ON((old ^ new) & ~KVM_PTE_LEAF_ATTR_HI_SW)) + if (!kvm_pte_valid(ctx->old)) + ctx->mm_ops->get_page(ctx->ptep); + else if (WARN_ON((ctx->old ^ new) & ~KVM_PTE_LEAF_ATTR_HI_SW)) return false; - smp_store_release(ptep, new); + smp_store_release(ctx->ptep, new); return true; } -static int hyp_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, void * const arg) +static int hyp_map_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - kvm_pte_t *childp; - struct hyp_map_data *data = arg; - struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops; + kvm_pte_t *childp, new; + struct hyp_map_data *data = ctx->arg; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; - if (hyp_map_walker_try_leaf(addr, end, level, ptep, arg)) + if (hyp_map_walker_try_leaf(ctx, data)) return 0; - if (WARN_ON(level == KVM_PGTABLE_MAX_LEVELS - 1)) + if (WARN_ON(ctx->level == KVM_PGTABLE_MAX_LEVELS - 1)) return -EINVAL; childp = (kvm_pte_t *)mm_ops->zalloc_page(NULL); if (!childp) return -ENOMEM; - kvm_set_table_pte(ptep, childp, mm_ops); - mm_ops->get_page(ptep); + new = kvm_init_table_pte(childp, mm_ops); + mm_ops->get_page(ctx->ptep); + smp_store_release(ctx->ptep, new); + return 0; } @@ -433,7 +434,6 @@ int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys, int ret; struct hyp_map_data map_data = { .phys = ALIGN_DOWN(phys, PAGE_SIZE), - .mm_ops = pgt->mm_ops, }; struct kvm_pgtable_walker walker = { .cb = hyp_map_walker, @@ -451,44 +451,39 @@ int kvm_pgtable_hyp_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys, return ret; } -struct hyp_unmap_data { - u64 unmapped; - struct kvm_pgtable_mm_ops *mm_ops; -}; - -static int hyp_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, void * const arg) +static int hyp_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - kvm_pte_t pte = *ptep, *childp = NULL; - u64 granule = kvm_granule_size(level); - struct hyp_unmap_data *data = arg; - struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops; + kvm_pte_t *childp = NULL; + u64 granule = kvm_granule_size(ctx->level); + u64 *unmapped = ctx->arg; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; - if (!kvm_pte_valid(pte)) + if (!kvm_pte_valid(ctx->old)) return -EINVAL; - if (kvm_pte_table(pte, level)) { - childp = kvm_pte_follow(pte, mm_ops); + if (kvm_pte_table(ctx->old, ctx->level)) { + childp = kvm_pte_follow(ctx->old, mm_ops); if (mm_ops->page_count(childp) != 1) return 0; - kvm_clear_pte(ptep); + kvm_clear_pte(ctx->ptep); dsb(ishst); - __tlbi_level(vae2is, __TLBI_VADDR(addr, 0), level); + __tlbi_level(vae2is, __TLBI_VADDR(ctx->addr, 0), ctx->level); } else { - if (end - addr < granule) + if (ctx->end - ctx->addr < granule) return -EINVAL; - kvm_clear_pte(ptep); + kvm_clear_pte(ctx->ptep); dsb(ishst); - __tlbi_level(vale2is, __TLBI_VADDR(addr, 0), level); - data->unmapped += granule; + __tlbi_level(vale2is, __TLBI_VADDR(ctx->addr, 0), ctx->level); + *unmapped += granule; } dsb(ish); isb(); - mm_ops->put_page(ptep); + mm_ops->put_page(ctx->ptep); if (childp) mm_ops->put_page(childp); @@ -498,12 +493,10 @@ static int hyp_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size) { - struct hyp_unmap_data unmap_data = { - .mm_ops = pgt->mm_ops, - }; + u64 unmapped = 0; struct kvm_pgtable_walker walker = { .cb = hyp_unmap_walker, - .arg = &unmap_data, + .arg = &unmapped, .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST, }; @@ -511,7 +504,7 @@ u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size) return 0; kvm_pgtable_walk(pgt, addr, size, &walker); - return unmap_data.unmapped; + return unmapped; } int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits, @@ -519,7 +512,7 @@ int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits, { u64 levels = ARM64_HW_PGTABLE_LEVELS(va_bits); - pgt->pgd = (kvm_pte_t *)mm_ops->zalloc_page(NULL); + pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_page(NULL); if (!pgt->pgd) return -ENOMEM; @@ -532,19 +525,18 @@ int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits, return 0; } -static int hyp_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, void * const arg) +static int hyp_free_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct kvm_pgtable_mm_ops *mm_ops = arg; - kvm_pte_t pte = *ptep; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; - if (!kvm_pte_valid(pte)) + if (!kvm_pte_valid(ctx->old)) return 0; - mm_ops->put_page(ptep); + mm_ops->put_page(ctx->ptep); - if (kvm_pte_table(pte, level)) - mm_ops->put_page(kvm_pte_follow(pte, mm_ops)); + if (kvm_pte_table(ctx->old, ctx->level)) + mm_ops->put_page(kvm_pte_follow(ctx->old, mm_ops)); return 0; } @@ -554,11 +546,10 @@ void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt) struct kvm_pgtable_walker walker = { .cb = hyp_free_walker, .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST, - .arg = pgt->mm_ops, }; WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker)); - pgt->mm_ops->put_page(pgt->pgd); + pgt->mm_ops->put_page(kvm_dereference_pteref(&walker, pgt->pgd)); pgt->pgd = NULL; } @@ -573,8 +564,6 @@ struct stage2_map_data { struct kvm_s2_mmu *mmu; void *memcache; - struct kvm_pgtable_mm_ops *mm_ops; - /* Force mappings to page granularity */ bool force_pte; }; @@ -682,19 +671,92 @@ static bool stage2_pte_is_counted(kvm_pte_t pte) return !!pte; } -static void stage2_put_pte(kvm_pte_t *ptep, struct kvm_s2_mmu *mmu, u64 addr, - u32 level, struct kvm_pgtable_mm_ops *mm_ops) +static bool stage2_pte_is_locked(kvm_pte_t pte) +{ + return !kvm_pte_valid(pte) && (pte & KVM_INVALID_PTE_LOCKED); +} + +static bool stage2_try_set_pte(const struct kvm_pgtable_visit_ctx *ctx, kvm_pte_t new) +{ + if (!kvm_pgtable_walk_shared(ctx)) { + WRITE_ONCE(*ctx->ptep, new); + return true; + } + + return cmpxchg(ctx->ptep, ctx->old, new) == ctx->old; +} + +/** + * stage2_try_break_pte() - Invalidates a pte according to the + * 'break-before-make' requirements of the + * architecture. + * + * @ctx: context of the visited pte. + * @mmu: stage-2 mmu + * + * Returns: true if the pte was successfully broken. + * + * If the removed pte was valid, performs the necessary serialization and TLB + * invalidation for the old value. For counted ptes, drops the reference count + * on the containing table page. + */ +static bool stage2_try_break_pte(const struct kvm_pgtable_visit_ctx *ctx, + struct kvm_s2_mmu *mmu) +{ + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; + + if (stage2_pte_is_locked(ctx->old)) { + /* + * Should never occur if this walker has exclusive access to the + * page tables. + */ + WARN_ON(!kvm_pgtable_walk_shared(ctx)); + return false; + } + + if (!stage2_try_set_pte(ctx, KVM_INVALID_PTE_LOCKED)) + return false; + + /* + * Perform the appropriate TLB invalidation based on the evicted pte + * value (if any). + */ + if (kvm_pte_table(ctx->old, ctx->level)) + kvm_call_hyp(__kvm_tlb_flush_vmid, mmu); + else if (kvm_pte_valid(ctx->old)) + kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, ctx->addr, ctx->level); + + if (stage2_pte_is_counted(ctx->old)) + mm_ops->put_page(ctx->ptep); + + return true; +} + +static void stage2_make_pte(const struct kvm_pgtable_visit_ctx *ctx, kvm_pte_t new) +{ + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; + + WARN_ON(!stage2_pte_is_locked(*ctx->ptep)); + + if (stage2_pte_is_counted(new)) + mm_ops->get_page(ctx->ptep); + + smp_store_release(ctx->ptep, new); +} + +static void stage2_put_pte(const struct kvm_pgtable_visit_ctx *ctx, struct kvm_s2_mmu *mmu, + struct kvm_pgtable_mm_ops *mm_ops) { /* * Clear the existing PTE, and perform break-before-make with * TLB maintenance if it was valid. */ - if (kvm_pte_valid(*ptep)) { - kvm_clear_pte(ptep); - kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, addr, level); + if (kvm_pte_valid(ctx->old)) { + kvm_clear_pte(ctx->ptep); + kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, ctx->addr, ctx->level); } - mm_ops->put_page(ptep); + mm_ops->put_page(ctx->ptep); } static bool stage2_pte_cacheable(struct kvm_pgtable *pgt, kvm_pte_t pte) @@ -708,44 +770,42 @@ static bool stage2_pte_executable(kvm_pte_t pte) return !(pte & KVM_PTE_LEAF_ATTR_HI_S2_XN); } -static bool stage2_leaf_mapping_allowed(u64 addr, u64 end, u32 level, +static bool stage2_leaf_mapping_allowed(const struct kvm_pgtable_visit_ctx *ctx, struct stage2_map_data *data) { - if (data->force_pte && (level < (KVM_PGTABLE_MAX_LEVELS - 1))) + if (data->force_pte && (ctx->level < (KVM_PGTABLE_MAX_LEVELS - 1))) return false; - return kvm_block_mapping_supported(addr, end, data->phys, level); + return kvm_block_mapping_supported(ctx, data->phys); } -static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, +static int stage2_map_walker_try_leaf(const struct kvm_pgtable_visit_ctx *ctx, struct stage2_map_data *data) { - kvm_pte_t new, old = *ptep; - u64 granule = kvm_granule_size(level), phys = data->phys; + kvm_pte_t new; + u64 granule = kvm_granule_size(ctx->level), phys = data->phys; struct kvm_pgtable *pgt = data->mmu->pgt; - struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; - if (!stage2_leaf_mapping_allowed(addr, end, level, data)) + if (!stage2_leaf_mapping_allowed(ctx, data)) return -E2BIG; if (kvm_phys_is_valid(phys)) - new = kvm_init_valid_leaf_pte(phys, data->attr, level); + new = kvm_init_valid_leaf_pte(phys, data->attr, ctx->level); else new = kvm_init_invalid_leaf_owner(data->owner_id); - if (stage2_pte_is_counted(old)) { - /* - * Skip updating the PTE if we are trying to recreate the exact - * same mapping or only change the access permissions. Instead, - * the vCPU will exit one more time from guest if still needed - * and then go through the path of relaxing permissions. - */ - if (!stage2_pte_needs_update(old, new)) - return -EAGAIN; + /* + * Skip updating the PTE if we are trying to recreate the exact + * same mapping or only change the access permissions. Instead, + * the vCPU will exit one more time from guest if still needed + * and then go through the path of relaxing permissions. + */ + if (!stage2_pte_needs_update(ctx->old, new)) + return -EAGAIN; - stage2_put_pte(ptep, data->mmu, addr, level, mm_ops); - } + if (!stage2_try_break_pte(ctx, data->mmu)) + return -EAGAIN; /* Perform CMOs before installation of the guest stage-2 PTE */ if (mm_ops->dcache_clean_inval_poc && stage2_pte_cacheable(pgt, new)) @@ -755,56 +815,43 @@ static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level, if (mm_ops->icache_inval_pou && stage2_pte_executable(new)) mm_ops->icache_inval_pou(kvm_pte_follow(new, mm_ops), granule); - smp_store_release(ptep, new); - if (stage2_pte_is_counted(new)) - mm_ops->get_page(ptep); + stage2_make_pte(ctx, new); + if (kvm_phys_is_valid(phys)) data->phys += granule; return 0; } -static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, +static int stage2_map_walk_table_pre(const struct kvm_pgtable_visit_ctx *ctx, struct stage2_map_data *data) { - if (data->anchor) - return 0; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; + kvm_pte_t *childp = kvm_pte_follow(ctx->old, mm_ops); + int ret; - if (!stage2_leaf_mapping_allowed(addr, end, level, data)) + if (!stage2_leaf_mapping_allowed(ctx, data)) return 0; - data->childp = kvm_pte_follow(*ptep, data->mm_ops); - kvm_clear_pte(ptep); + ret = stage2_map_walker_try_leaf(ctx, data); + if (ret) + return ret; - /* - * Invalidate the whole stage-2, as we may have numerous leaf - * entries below us which would otherwise need invalidating - * individually. - */ - kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu); - data->anchor = ptep; + mm_ops->free_removed_table(childp, ctx->level); return 0; } -static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, +static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx, struct stage2_map_data *data) { - struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops; - kvm_pte_t *childp, pte = *ptep; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; + kvm_pte_t *childp, new; int ret; - if (data->anchor) { - if (stage2_pte_is_counted(pte)) - mm_ops->put_page(ptep); - - return 0; - } - - ret = stage2_map_walker_try_leaf(addr, end, level, ptep, data); + ret = stage2_map_walker_try_leaf(ctx, data); if (ret != -E2BIG) return ret; - if (WARN_ON(level == KVM_PGTABLE_MAX_LEVELS - 1)) + if (WARN_ON(ctx->level == KVM_PGTABLE_MAX_LEVELS - 1)) return -EINVAL; if (!data->memcache) @@ -814,99 +861,62 @@ static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, if (!childp) return -ENOMEM; + if (!stage2_try_break_pte(ctx, data->mmu)) { + mm_ops->put_page(childp); + return -EAGAIN; + } + /* * If we've run into an existing block mapping then replace it with * a table. Accesses beyond 'end' that fall within the new table * will be mapped lazily. */ - if (stage2_pte_is_counted(pte)) - stage2_put_pte(ptep, data->mmu, addr, level, mm_ops); - - kvm_set_table_pte(ptep, childp, mm_ops); - mm_ops->get_page(ptep); + new = kvm_init_table_pte(childp, mm_ops); + stage2_make_pte(ctx, new); return 0; } -static int stage2_map_walk_table_post(u64 addr, u64 end, u32 level, - kvm_pte_t *ptep, - struct stage2_map_data *data) -{ - struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops; - kvm_pte_t *childp; - int ret = 0; - - if (!data->anchor) - return 0; - - if (data->anchor == ptep) { - childp = data->childp; - data->anchor = NULL; - data->childp = NULL; - ret = stage2_map_walk_leaf(addr, end, level, ptep, data); - } else { - childp = kvm_pte_follow(*ptep, mm_ops); - } - - mm_ops->put_page(childp); - mm_ops->put_page(ptep); - - return ret; -} - /* - * This is a little fiddly, as we use all three of the walk flags. The idea - * is that the TABLE_PRE callback runs for table entries on the way down, - * looking for table entries which we could conceivably replace with a - * block entry for this mapping. If it finds one, then it sets the 'anchor' - * field in 'struct stage2_map_data' to point at the table entry, before - * clearing the entry to zero and descending into the now detached table. + * The TABLE_PRE callback runs for table entries on the way down, looking + * for table entries which we could conceivably replace with a block entry + * for this mapping. If it finds one it replaces the entry and calls + * kvm_pgtable_mm_ops::free_removed_table() to tear down the detached table. * - * The behaviour of the LEAF callback then depends on whether or not the - * anchor has been set. If not, then we're not using a block mapping higher - * up the table and we perform the mapping at the existing leaves instead. - * If, on the other hand, the anchor _is_ set, then we drop references to - * all valid leaves so that the pages beneath the anchor can be freed. - * - * Finally, the TABLE_POST callback does nothing if the anchor has not - * been set, but otherwise frees the page-table pages while walking back up - * the page-table, installing the block entry when it revisits the anchor - * pointer and clearing the anchor to NULL. + * Otherwise, the LEAF callback performs the mapping at the existing leaves + * instead. */ -static int stage2_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, void * const arg) +static int stage2_map_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct stage2_map_data *data = arg; + struct stage2_map_data *data = ctx->arg; - switch (flag) { + switch (visit) { case KVM_PGTABLE_WALK_TABLE_PRE: - return stage2_map_walk_table_pre(addr, end, level, ptep, data); + return stage2_map_walk_table_pre(ctx, data); case KVM_PGTABLE_WALK_LEAF: - return stage2_map_walk_leaf(addr, end, level, ptep, data); - case KVM_PGTABLE_WALK_TABLE_POST: - return stage2_map_walk_table_post(addr, end, level, ptep, data); + return stage2_map_walk_leaf(ctx, data); + default: + return -EINVAL; } - - return -EINVAL; } int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys, enum kvm_pgtable_prot prot, - void *mc) + void *mc, enum kvm_pgtable_walk_flags flags) { int ret; struct stage2_map_data map_data = { .phys = ALIGN_DOWN(phys, PAGE_SIZE), .mmu = pgt->mmu, .memcache = mc, - .mm_ops = pgt->mm_ops, .force_pte = pgt->force_pte_cb && pgt->force_pte_cb(addr, addr + size, prot), }; struct kvm_pgtable_walker walker = { .cb = stage2_map_walker, - .flags = KVM_PGTABLE_WALK_TABLE_PRE | - KVM_PGTABLE_WALK_LEAF | - KVM_PGTABLE_WALK_TABLE_POST, + .flags = flags | + KVM_PGTABLE_WALK_TABLE_PRE | + KVM_PGTABLE_WALK_LEAF, .arg = &map_data, }; @@ -930,15 +940,13 @@ int kvm_pgtable_stage2_set_owner(struct kvm_pgtable *pgt, u64 addr, u64 size, .phys = KVM_PHYS_INVALID, .mmu = pgt->mmu, .memcache = mc, - .mm_ops = pgt->mm_ops, .owner_id = owner_id, .force_pte = true, }; struct kvm_pgtable_walker walker = { .cb = stage2_map_walker, .flags = KVM_PGTABLE_WALK_TABLE_PRE | - KVM_PGTABLE_WALK_LEAF | - KVM_PGTABLE_WALK_TABLE_POST, + KVM_PGTABLE_WALK_LEAF, .arg = &map_data, }; @@ -949,30 +957,29 @@ int kvm_pgtable_stage2_set_owner(struct kvm_pgtable *pgt, u64 addr, u64 size, return ret; } -static int stage2_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg) +static int stage2_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct kvm_pgtable *pgt = arg; + struct kvm_pgtable *pgt = ctx->arg; struct kvm_s2_mmu *mmu = pgt->mmu; - struct kvm_pgtable_mm_ops *mm_ops = pgt->mm_ops; - kvm_pte_t pte = *ptep, *childp = NULL; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; + kvm_pte_t *childp = NULL; bool need_flush = false; - if (!kvm_pte_valid(pte)) { - if (stage2_pte_is_counted(pte)) { - kvm_clear_pte(ptep); - mm_ops->put_page(ptep); + if (!kvm_pte_valid(ctx->old)) { + if (stage2_pte_is_counted(ctx->old)) { + kvm_clear_pte(ctx->ptep); + mm_ops->put_page(ctx->ptep); } return 0; } - if (kvm_pte_table(pte, level)) { - childp = kvm_pte_follow(pte, mm_ops); + if (kvm_pte_table(ctx->old, ctx->level)) { + childp = kvm_pte_follow(ctx->old, mm_ops); if (mm_ops->page_count(childp) != 1) return 0; - } else if (stage2_pte_cacheable(pgt, pte)) { + } else if (stage2_pte_cacheable(pgt, ctx->old)) { need_flush = !stage2_has_fwb(pgt); } @@ -981,11 +988,11 @@ static int stage2_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, * block entry and rely on the remaining portions being faulted * back lazily. */ - stage2_put_pte(ptep, mmu, addr, level, mm_ops); + stage2_put_pte(ctx, mmu, mm_ops); if (need_flush && mm_ops->dcache_clean_inval_poc) - mm_ops->dcache_clean_inval_poc(kvm_pte_follow(pte, mm_ops), - kvm_granule_size(level)); + mm_ops->dcache_clean_inval_poc(kvm_pte_follow(ctx->old, mm_ops), + kvm_granule_size(ctx->level)); if (childp) mm_ops->put_page(childp); @@ -1009,21 +1016,19 @@ struct stage2_attr_data { kvm_pte_t attr_clr; kvm_pte_t pte; u32 level; - struct kvm_pgtable_mm_ops *mm_ops; }; -static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg) +static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - kvm_pte_t pte = *ptep; - struct stage2_attr_data *data = arg; - struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops; + kvm_pte_t pte = ctx->old; + struct stage2_attr_data *data = ctx->arg; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; - if (!kvm_pte_valid(pte)) + if (!kvm_pte_valid(ctx->old)) return 0; - data->level = level; + data->level = ctx->level; data->pte = pte; pte &= ~data->attr_clr; pte |= data->attr_set; @@ -1039,10 +1044,12 @@ static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, * stage-2 PTE if we are going to add executable permission. */ if (mm_ops->icache_inval_pou && - stage2_pte_executable(pte) && !stage2_pte_executable(*ptep)) + stage2_pte_executable(pte) && !stage2_pte_executable(ctx->old)) mm_ops->icache_inval_pou(kvm_pte_follow(pte, mm_ops), - kvm_granule_size(level)); - WRITE_ONCE(*ptep, pte); + kvm_granule_size(ctx->level)); + + if (!stage2_try_set_pte(ctx, pte)) + return -EAGAIN; } return 0; @@ -1051,19 +1058,18 @@ static int stage2_attr_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr, u64 size, kvm_pte_t attr_set, kvm_pte_t attr_clr, kvm_pte_t *orig_pte, - u32 *level) + u32 *level, enum kvm_pgtable_walk_flags flags) { int ret; kvm_pte_t attr_mask = KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI; struct stage2_attr_data data = { .attr_set = attr_set & attr_mask, .attr_clr = attr_clr & attr_mask, - .mm_ops = pgt->mm_ops, }; struct kvm_pgtable_walker walker = { .cb = stage2_attr_walker, .arg = &data, - .flags = KVM_PGTABLE_WALK_LEAF, + .flags = flags | KVM_PGTABLE_WALK_LEAF, }; ret = kvm_pgtable_walk(pgt, addr, size, &walker); @@ -1082,14 +1088,14 @@ int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size) { return stage2_update_leaf_attrs(pgt, addr, size, 0, KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W, - NULL, NULL); + NULL, NULL, 0); } kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr) { kvm_pte_t pte = 0; stage2_update_leaf_attrs(pgt, addr, 1, KVM_PTE_LEAF_ATTR_LO_S2_AF, 0, - &pte, NULL); + &pte, NULL, 0); dsb(ishst); return pte; } @@ -1098,7 +1104,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) { kvm_pte_t pte = 0; stage2_update_leaf_attrs(pgt, addr, 1, 0, KVM_PTE_LEAF_ATTR_LO_S2_AF, - &pte, NULL); + &pte, NULL, 0); /* * "But where's the TLBI?!", you scream. * "Over in the core code", I sigh. @@ -1111,7 +1117,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr) { kvm_pte_t pte = 0; - stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL); + stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL, 0); return pte & KVM_PTE_LEAF_ATTR_LO_S2_AF; } @@ -1134,26 +1140,25 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, if (prot & KVM_PGTABLE_PROT_X) clr |= KVM_PTE_LEAF_ATTR_HI_S2_XN; - ret = stage2_update_leaf_attrs(pgt, addr, 1, set, clr, NULL, &level); + ret = stage2_update_leaf_attrs(pgt, addr, 1, set, clr, NULL, &level, + KVM_PGTABLE_WALK_SHARED); if (!ret) kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, pgt->mmu, addr, level); return ret; } -static int stage2_flush_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg) +static int stage2_flush_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct kvm_pgtable *pgt = arg; + struct kvm_pgtable *pgt = ctx->arg; struct kvm_pgtable_mm_ops *mm_ops = pgt->mm_ops; - kvm_pte_t pte = *ptep; - if (!kvm_pte_valid(pte) || !stage2_pte_cacheable(pgt, pte)) + if (!kvm_pte_valid(ctx->old) || !stage2_pte_cacheable(pgt, ctx->old)) return 0; if (mm_ops->dcache_clean_inval_poc) - mm_ops->dcache_clean_inval_poc(kvm_pte_follow(pte, mm_ops), - kvm_granule_size(level)); + mm_ops->dcache_clean_inval_poc(kvm_pte_follow(ctx->old, mm_ops), + kvm_granule_size(ctx->level)); return 0; } @@ -1184,7 +1189,7 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0; pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE; - pgt->pgd = mm_ops->zalloc_pages_exact(pgd_sz); + pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_pages_exact(pgd_sz); if (!pgt->pgd) return -ENOMEM; @@ -1200,20 +1205,27 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, return 0; } -static int stage2_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, - enum kvm_pgtable_walk_flags flag, - void * const arg) +size_t kvm_pgtable_stage2_pgd_size(u64 vtcr) +{ + u32 ia_bits = VTCR_EL2_IPA(vtcr); + u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr); + u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0; + + return kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE; +} + +static int stage2_free_walker(const struct kvm_pgtable_visit_ctx *ctx, + enum kvm_pgtable_walk_flags visit) { - struct kvm_pgtable_mm_ops *mm_ops = arg; - kvm_pte_t pte = *ptep; + struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops; - if (!stage2_pte_is_counted(pte)) + if (!stage2_pte_is_counted(ctx->old)) return 0; - mm_ops->put_page(ptep); + mm_ops->put_page(ctx->ptep); - if (kvm_pte_table(pte, level)) - mm_ops->put_page(kvm_pte_follow(pte, mm_ops)); + if (kvm_pte_table(ctx->old, ctx->level)) + mm_ops->put_page(kvm_pte_follow(ctx->old, mm_ops)); return 0; } @@ -1225,11 +1237,33 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt) .cb = stage2_free_walker, .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST, - .arg = pgt->mm_ops, }; WARN_ON(kvm_pgtable_walk(pgt, 0, BIT(pgt->ia_bits), &walker)); pgd_sz = kvm_pgd_pages(pgt->ia_bits, pgt->start_level) * PAGE_SIZE; - pgt->mm_ops->free_pages_exact(pgt->pgd, pgd_sz); + pgt->mm_ops->free_pages_exact(kvm_dereference_pteref(&walker, pgt->pgd), pgd_sz); pgt->pgd = NULL; } + +void kvm_pgtable_stage2_free_removed(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level) +{ + kvm_pteref_t ptep = (kvm_pteref_t)pgtable; + struct kvm_pgtable_walker walker = { + .cb = stage2_free_walker, + .flags = KVM_PGTABLE_WALK_LEAF | + KVM_PGTABLE_WALK_TABLE_POST, + }; + struct kvm_pgtable_walk_data data = { + .walker = &walker, + + /* + * At this point the IPA really doesn't matter, as the page + * table being traversed has already been removed from the stage + * 2. Set an appropriate range to cover the entire page table. + */ + .addr = 0, + .end = kvm_granule_size(level), + }; + + WARN_ON(__kvm_pgtable_walk(&data, mm_ops, ptep, level + 1)); +} diff --git a/arch/arm64/kvm/hyp/vhe/Makefile b/arch/arm64/kvm/hyp/vhe/Makefile index 96bec0ecf9dd..3b9e5464b5b3 100644 --- a/arch/arm64/kvm/hyp/vhe/Makefile +++ b/arch/arm64/kvm/hyp/vhe/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 # -# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part +# Makefile for Kernel-based Virtual Machine module, HYP/VHE part # asflags-y := -D__KVM_VHE_HYPERVISOR__ diff --git a/arch/arm64/kvm/irq.h b/arch/arm64/kvm/irq.h deleted file mode 100644 index 0d257de42c10..000000000000 --- a/arch/arm64/kvm/irq.h +++ /dev/null @@ -1,16 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * irq.h: in kernel interrupt controller related definitions - * Copyright (c) 2016 Red Hat, Inc. - * - * This header is included by irqchip.c. However, on ARM, interrupt - * controller declarations are located in include/kvm/arm_vgic.h since - * they are mostly shared between arm and arm64. - */ - -#ifndef __IRQ_H -#define __IRQ_H - -#include <kvm/arm_vgic.h> - -#endif diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 60ee3d9f01f8..31d7fa4c7c14 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -128,6 +128,25 @@ static void kvm_s2_free_pages_exact(void *virt, size_t size) free_pages_exact(virt, size); } +static struct kvm_pgtable_mm_ops kvm_s2_mm_ops; + +static void stage2_free_removed_table_rcu_cb(struct rcu_head *head) +{ + struct page *page = container_of(head, struct page, rcu_head); + void *pgtable = page_to_virt(page); + u32 level = page_private(page); + + kvm_pgtable_stage2_free_removed(&kvm_s2_mm_ops, pgtable, level); +} + +static void stage2_free_removed_table(void *addr, u32 level) +{ + struct page *page = virt_to_page(addr); + + set_page_private(page, (unsigned long)level); + call_rcu(&page->rcu_head, stage2_free_removed_table_rcu_cb); +} + static void kvm_host_get_page(void *addr) { get_page(virt_to_page(addr)); @@ -640,8 +659,8 @@ static struct kvm_pgtable_mm_ops kvm_user_mm_ops = { static int get_user_mapping_size(struct kvm *kvm, u64 addr) { struct kvm_pgtable pgt = { - .pgd = (kvm_pte_t *)kvm->mm->pgd, - .ia_bits = VA_BITS, + .pgd = (kvm_pteref_t)kvm->mm->pgd, + .ia_bits = vabits_actual, .start_level = (KVM_PGTABLE_MAX_LEVELS - CONFIG_PGTABLE_LEVELS), .mm_ops = &kvm_user_mm_ops, @@ -662,6 +681,7 @@ static struct kvm_pgtable_mm_ops kvm_s2_mm_ops = { .zalloc_page = stage2_memcache_zalloc_page, .zalloc_pages_exact = kvm_s2_zalloc_pages_exact, .free_pages_exact = kvm_s2_free_pages_exact, + .free_removed_table = stage2_free_removed_table, .get_page = kvm_host_get_page, .put_page = kvm_s2_put_page, .page_count = kvm_host_page_count, @@ -675,15 +695,42 @@ static struct kvm_pgtable_mm_ops kvm_s2_mm_ops = { * kvm_init_stage2_mmu - Initialise a S2 MMU structure * @kvm: The pointer to the KVM structure * @mmu: The pointer to the s2 MMU structure + * @type: The machine type of the virtual machine * * Allocates only the stage-2 HW PGD level table(s). * Note we don't need locking here as this is only called when the VM is * created, which can only be done once. */ -int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu) +int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu, unsigned long type) { + u32 kvm_ipa_limit = get_kvm_ipa_limit(); int cpu, err; struct kvm_pgtable *pgt; + u64 mmfr0, mmfr1; + u32 phys_shift; + + if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) + return -EINVAL; + + phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); + if (is_protected_kvm_enabled()) { + phys_shift = kvm_ipa_limit; + } else if (phys_shift) { + if (phys_shift > kvm_ipa_limit || + phys_shift < ARM64_MIN_PARANGE_BITS) + return -EINVAL; + } else { + phys_shift = KVM_PHYS_SHIFT; + if (phys_shift > kvm_ipa_limit) { + pr_warn_once("%s using unsupported default IPA limit, upgrade your VMM\n", + current->comm); + return -EINVAL; + } + } + + mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); + mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); + kvm->arch.vtcr = kvm_get_vtcr(mmfr0, mmfr1, phys_shift); if (mmu->pgt != NULL) { kvm_err("kvm_arch already initialized?\n"); @@ -807,6 +854,32 @@ void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu) } } +static void hyp_mc_free_fn(void *addr, void *unused) +{ + free_page((unsigned long)addr); +} + +static void *hyp_mc_alloc_fn(void *unused) +{ + return (void *)__get_free_page(GFP_KERNEL_ACCOUNT); +} + +void free_hyp_memcache(struct kvm_hyp_memcache *mc) +{ + if (is_protected_kvm_enabled()) + __free_hyp_memcache(mc, hyp_mc_free_fn, + kvm_host_va, NULL); +} + +int topup_hyp_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages) +{ + if (!is_protected_kvm_enabled()) + return 0; + + return __topup_hyp_memcache(mc, min_pages, hyp_mc_alloc_fn, + kvm_host_pa, NULL); +} + /** * kvm_phys_addr_ioremap - map a device range to guest IPA * @@ -841,7 +914,7 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, write_lock(&kvm->mmu_lock); ret = kvm_pgtable_stage2_map(pgt, addr, PAGE_SIZE, pa, prot, - &cache); + &cache, 0); write_unlock(&kvm->mmu_lock); if (ret) break; @@ -1091,32 +1164,26 @@ static int get_vma_page_shift(struct vm_area_struct *vma, unsigned long hva) * - mmap_lock protects between a VM faulting a page in and the VMM performing * an mprotect() to add VM_MTE */ -static int sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn, - unsigned long size) +static void sanitise_mte_tags(struct kvm *kvm, kvm_pfn_t pfn, + unsigned long size) { unsigned long i, nr_pages = size >> PAGE_SHIFT; - struct page *page; + struct page *page = pfn_to_page(pfn); if (!kvm_has_mte(kvm)) - return 0; - - /* - * pfn_to_online_page() is used to reject ZONE_DEVICE pages - * that may not support tags. - */ - page = pfn_to_online_page(pfn); - - if (!page) - return -EFAULT; + return; for (i = 0; i < nr_pages; i++, page++) { - if (!test_bit(PG_mte_tagged, &page->flags)) { + if (try_page_mte_tagging(page)) { mte_clear_page_tags(page_address(page)); - set_bit(PG_mte_tagged, &page->flags); + set_page_mte_tagged(page); } } +} - return 0; +static bool kvm_vma_mte_allowed(struct vm_area_struct *vma) +{ + return vma->vm_flags & VM_MTE_ALLOWED; } static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, @@ -1127,7 +1194,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, bool write_fault, writable, force_pte = false; bool exec_fault; bool device = false; - bool shared; unsigned long mmu_seq; struct kvm *kvm = vcpu->kvm; struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; @@ -1136,7 +1202,6 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, gfn_t gfn; kvm_pfn_t pfn; bool logging_active = memslot_is_logging(memslot); - bool use_read_lock = false; unsigned long fault_level = kvm_vcpu_trap_get_fault_level(vcpu); unsigned long vma_pagesize, fault_granule; enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_R; @@ -1171,14 +1236,10 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (logging_active) { force_pte = true; vma_shift = PAGE_SHIFT; - use_read_lock = (fault_status == FSC_PERM && write_fault && - fault_granule == PAGE_SIZE); } else { vma_shift = get_vma_page_shift(vma, hva); } - shared = (vma->vm_flags & VM_SHARED); - switch (vma_shift) { #ifndef __PAGETABLE_PMD_FOLDED case PUD_SHIFT: @@ -1239,7 +1300,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, */ smp_rmb(); - pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL, + pfn = __gfn_to_pfn_memslot(memslot, gfn, false, false, NULL, write_fault, &writable, NULL); if (pfn == KVM_PFN_ERR_HWPOISON) { kvm_send_hwpoison_signal(hva, vma_shift); @@ -1271,15 +1332,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, if (exec_fault && device) return -ENOEXEC; - /* - * To reduce MMU contentions and enhance concurrency during dirty - * logging dirty logging, only acquire read lock for permission - * relaxation. - */ - if (use_read_lock) - read_lock(&kvm->mmu_lock); - else - write_lock(&kvm->mmu_lock); + read_lock(&kvm->mmu_lock); pgt = vcpu->arch.hw_mmu->pgt; if (mmu_invalidate_retry(kvm, mmu_seq)) goto out_unlock; @@ -1298,13 +1351,13 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, } if (fault_status != FSC_PERM && !device && kvm_has_mte(kvm)) { - /* Check the VMM hasn't introduced a new VM_SHARED VMA */ - if (!shared) - ret = sanitise_mte_tags(kvm, pfn, vma_pagesize); - else + /* Check the VMM hasn't introduced a new disallowed VMA */ + if (kvm_vma_mte_allowed(vma)) { + sanitise_mte_tags(kvm, pfn, vma_pagesize); + } else { ret = -EFAULT; - if (ret) goto out_unlock; + } } if (writable) @@ -1323,15 +1376,12 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, * permissions only if vma_pagesize equals fault_granule. Otherwise, * kvm_pgtable_stage2_map() should be called to change block size. */ - if (fault_status == FSC_PERM && vma_pagesize == fault_granule) { + if (fault_status == FSC_PERM && vma_pagesize == fault_granule) ret = kvm_pgtable_stage2_relax_perms(pgt, fault_ipa, prot); - } else { - WARN_ONCE(use_read_lock, "Attempted stage-2 map outside of write lock\n"); - + else ret = kvm_pgtable_stage2_map(pgt, fault_ipa, vma_pagesize, __pfn_to_phys(pfn), prot, - memcache); - } + memcache, KVM_PGTABLE_WALK_SHARED); /* Mark the page dirty only if the fault is handled successfully */ if (writable && !ret) { @@ -1340,10 +1390,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, } out_unlock: - if (use_read_lock) - read_unlock(&kvm->mmu_lock); - else - write_unlock(&kvm->mmu_lock); + read_unlock(&kvm->mmu_lock); kvm_set_pfn_accessed(pfn); kvm_release_pfn_clean(pfn); return ret != -EAGAIN ? ret : 0; @@ -1526,15 +1573,18 @@ bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range) { kvm_pfn_t pfn = pte_pfn(range->pte); - int ret; if (!kvm->arch.mmu.pgt) return false; WARN_ON(range->end - range->start != 1); - ret = sanitise_mte_tags(kvm, pfn, PAGE_SIZE); - if (ret) + /* + * If the page isn't tagged, defer to user_mem_abort() for sanitising + * the MTE tags. The S2 pte should have been unmapped by + * mmu_notifier_invalidate_range_end(). + */ + if (kvm_has_mte(kvm) && !page_mte_tagged(pfn_to_page(pfn))) return false; /* @@ -1549,7 +1599,7 @@ bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range) */ kvm_pgtable_stage2_map(kvm->arch.mmu.pgt, range->start << PAGE_SHIFT, PAGE_SIZE, __pfn_to_phys(pfn), - KVM_PGTABLE_PROT_R, NULL); + KVM_PGTABLE_PROT_R, NULL, 0); return false; } @@ -1618,6 +1668,8 @@ static struct kvm_pgtable_mm_ops kvm_hyp_mm_ops = { int kvm_mmu_init(u32 *hyp_va_bits) { int err; + u32 idmap_bits; + u32 kernel_bits; hyp_idmap_start = __pa_symbol(__hyp_idmap_text_start); hyp_idmap_start = ALIGN_DOWN(hyp_idmap_start, PAGE_SIZE); @@ -1631,7 +1683,31 @@ int kvm_mmu_init(u32 *hyp_va_bits) */ BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK); - *hyp_va_bits = 64 - ((idmap_t0sz & TCR_T0SZ_MASK) >> TCR_T0SZ_OFFSET); + /* + * The ID map may be configured to use an extended virtual address + * range. This is only the case if system RAM is out of range for the + * currently configured page size and VA_BITS_MIN, in which case we will + * also need the extended virtual range for the HYP ID map, or we won't + * be able to enable the EL2 MMU. + * + * However, in some cases the ID map may be configured for fewer than + * the number of VA bits used by the regular kernel stage 1. This + * happens when VA_BITS=52 and the kernel image is placed in PA space + * below 48 bits. + * + * At EL2, there is only one TTBR register, and we can't switch between + * translation tables *and* update TCR_EL2.T0SZ at the same time. Bottom + * line: we need to use the extended range with *both* our translation + * tables. + * + * So use the maximum of the idmap VA bits and the regular kernel stage + * 1 VA bits to assure that the hypervisor can both ID map its code page + * and map any kernel memory. + */ + idmap_bits = 64 - ((idmap_t0sz & TCR_T0SZ_MASK) >> TCR_T0SZ_OFFSET); + kernel_bits = vabits_actual; + *hyp_va_bits = max(idmap_bits, kernel_bits); + kvm_debug("Using %u-bit virtual addresses at EL2\n", *hyp_va_bits); kvm_debug("IDMAP page: %lx\n", hyp_idmap_start); kvm_debug("HYP VA range: %lx:%lx\n", @@ -1740,12 +1816,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, if (!vma) break; - /* - * VM_SHARED mappings are not allowed with MTE to avoid races - * when updating the PG_mte_tagged page flag, see - * sanitise_mte_tags for more details. - */ - if (kvm_has_mte(kvm) && vma->vm_flags & VM_SHARED) { + if (kvm_has_mte(kvm) && !kvm_vma_mte_allowed(vma)) { ret = -EINVAL; break; } diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index ebecb7c045f4..cf56958b1492 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -6,6 +6,7 @@ #include <linux/kvm_host.h> #include <linux/memblock.h> +#include <linux/mutex.h> #include <linux/sort.h> #include <asm/kvm_pkvm.h> @@ -53,7 +54,7 @@ static int __init register_memblock_regions(void) void __init kvm_hyp_reserve(void) { - u64 nr_pages, prev, hyp_mem_pages = 0; + u64 hyp_mem_pages = 0; int ret; if (!is_hyp_mode_available() || is_kernel_in_hyp_mode()) @@ -71,21 +72,8 @@ void __init kvm_hyp_reserve(void) hyp_mem_pages += hyp_s1_pgtable_pages(); hyp_mem_pages += host_s2_pgtable_pages(); - - /* - * The hyp_vmemmap needs to be backed by pages, but these pages - * themselves need to be present in the vmemmap, so compute the number - * of pages needed by looking for a fixed point. - */ - nr_pages = 0; - do { - prev = nr_pages; - nr_pages = hyp_mem_pages + prev; - nr_pages = DIV_ROUND_UP(nr_pages * STRUCT_HYP_PAGE_SIZE, - PAGE_SIZE); - nr_pages += __hyp_pgtable_max_pages(nr_pages); - } while (nr_pages != prev); - hyp_mem_pages += nr_pages; + hyp_mem_pages += hyp_vm_table_pages(); + hyp_mem_pages += hyp_vmemmap_pages(STRUCT_HYP_PAGE_SIZE); /* * Try to allocate a PMD-aligned region to reduce TLB pressure once @@ -107,3 +95,121 @@ void __init kvm_hyp_reserve(void) kvm_info("Reserved %lld MiB at 0x%llx\n", hyp_mem_size >> 20, hyp_mem_base); } + +/* + * Allocates and donates memory for hypervisor VM structs at EL2. + * + * Allocates space for the VM state, which includes the hyp vm as well as + * the hyp vcpus. + * + * Stores an opaque handler in the kvm struct for future reference. + * + * Return 0 on success, negative error code on failure. + */ +static int __pkvm_create_hyp_vm(struct kvm *host_kvm) +{ + size_t pgd_sz, hyp_vm_sz, hyp_vcpu_sz; + struct kvm_vcpu *host_vcpu; + pkvm_handle_t handle; + void *pgd, *hyp_vm; + unsigned long idx; + int ret; + + if (host_kvm->created_vcpus < 1) + return -EINVAL; + + pgd_sz = kvm_pgtable_stage2_pgd_size(host_kvm->arch.vtcr); + + /* + * The PGD pages will be reclaimed using a hyp_memcache which implies + * page granularity. So, use alloc_pages_exact() to get individual + * refcounts. + */ + pgd = alloc_pages_exact(pgd_sz, GFP_KERNEL_ACCOUNT); + if (!pgd) + return -ENOMEM; + + /* Allocate memory to donate to hyp for vm and vcpu pointers. */ + hyp_vm_sz = PAGE_ALIGN(size_add(PKVM_HYP_VM_SIZE, + size_mul(sizeof(void *), + host_kvm->created_vcpus))); + hyp_vm = alloc_pages_exact(hyp_vm_sz, GFP_KERNEL_ACCOUNT); + if (!hyp_vm) { + ret = -ENOMEM; + goto free_pgd; + } + + /* Donate the VM memory to hyp and let hyp initialize it. */ + ret = kvm_call_hyp_nvhe(__pkvm_init_vm, host_kvm, hyp_vm, pgd); + if (ret < 0) + goto free_vm; + + handle = ret; + + host_kvm->arch.pkvm.handle = handle; + + /* Donate memory for the vcpus at hyp and initialize it. */ + hyp_vcpu_sz = PAGE_ALIGN(PKVM_HYP_VCPU_SIZE); + kvm_for_each_vcpu(idx, host_vcpu, host_kvm) { + void *hyp_vcpu; + + /* Indexing of the vcpus to be sequential starting at 0. */ + if (WARN_ON(host_vcpu->vcpu_idx != idx)) { + ret = -EINVAL; + goto destroy_vm; + } + + hyp_vcpu = alloc_pages_exact(hyp_vcpu_sz, GFP_KERNEL_ACCOUNT); + if (!hyp_vcpu) { + ret = -ENOMEM; + goto destroy_vm; + } + + ret = kvm_call_hyp_nvhe(__pkvm_init_vcpu, handle, host_vcpu, + hyp_vcpu); + if (ret) { + free_pages_exact(hyp_vcpu, hyp_vcpu_sz); + goto destroy_vm; + } + } + + return 0; + +destroy_vm: + pkvm_destroy_hyp_vm(host_kvm); + return ret; +free_vm: + free_pages_exact(hyp_vm, hyp_vm_sz); +free_pgd: + free_pages_exact(pgd, pgd_sz); + return ret; +} + +int pkvm_create_hyp_vm(struct kvm *host_kvm) +{ + int ret = 0; + + mutex_lock(&host_kvm->lock); + if (!host_kvm->arch.pkvm.handle) + ret = __pkvm_create_hyp_vm(host_kvm); + mutex_unlock(&host_kvm->lock); + + return ret; +} + +void pkvm_destroy_hyp_vm(struct kvm *host_kvm) +{ + if (host_kvm->arch.pkvm.handle) { + WARN_ON(kvm_call_hyp_nvhe(__pkvm_teardown_vm, + host_kvm->arch.pkvm.handle)); + } + + host_kvm->arch.pkvm.handle = 0; + free_hyp_memcache(&host_kvm->arch.pkvm.teardown_mc); +} + +int pkvm_init_host_vm(struct kvm *host_kvm) +{ + mutex_init(&host_kvm->lock); + return 0; +} diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 0003c7d37533..24908400e190 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -15,16 +15,25 @@ #include <kvm/arm_pmu.h> #include <kvm/arm_vgic.h> +#define PERF_ATTR_CFG1_COUNTER_64BIT BIT(0) + DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available); static LIST_HEAD(arm_pmus); static DEFINE_MUTEX(arm_pmus_lock); -static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx); -static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx); -static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc); +static void kvm_pmu_create_perf_event(struct kvm_pmc *pmc); +static void kvm_pmu_release_perf_event(struct kvm_pmc *pmc); + +static struct kvm_vcpu *kvm_pmc_to_vcpu(const struct kvm_pmc *pmc) +{ + return container_of(pmc, struct kvm_vcpu, arch.pmu.pmc[pmc->idx]); +} -#define PERF_ATTR_CFG1_KVM_PMU_CHAINED 0x1 +static struct kvm_pmc *kvm_vcpu_idx_to_pmc(struct kvm_vcpu *vcpu, int cnt_idx) +{ + return &vcpu->arch.pmu.pmc[cnt_idx]; +} static u32 kvm_pmu_event_mask(struct kvm *kvm) { @@ -47,113 +56,46 @@ static u32 kvm_pmu_event_mask(struct kvm *kvm) } /** - * kvm_pmu_idx_is_64bit - determine if select_idx is a 64bit counter - * @vcpu: The vcpu pointer - * @select_idx: The counter index + * kvm_pmc_is_64bit - determine if counter is 64bit + * @pmc: counter context */ -static bool kvm_pmu_idx_is_64bit(struct kvm_vcpu *vcpu, u64 select_idx) +static bool kvm_pmc_is_64bit(struct kvm_pmc *pmc) { - return (select_idx == ARMV8_PMU_CYCLE_IDX && - __vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_LC); + return (pmc->idx == ARMV8_PMU_CYCLE_IDX || + kvm_pmu_is_3p5(kvm_pmc_to_vcpu(pmc))); } -static struct kvm_vcpu *kvm_pmc_to_vcpu(struct kvm_pmc *pmc) +static bool kvm_pmc_has_64bit_overflow(struct kvm_pmc *pmc) { - struct kvm_pmu *pmu; - struct kvm_vcpu_arch *vcpu_arch; + u64 val = __vcpu_sys_reg(kvm_pmc_to_vcpu(pmc), PMCR_EL0); - pmc -= pmc->idx; - pmu = container_of(pmc, struct kvm_pmu, pmc[0]); - vcpu_arch = container_of(pmu, struct kvm_vcpu_arch, pmu); - return container_of(vcpu_arch, struct kvm_vcpu, arch); + return (pmc->idx < ARMV8_PMU_CYCLE_IDX && (val & ARMV8_PMU_PMCR_LP)) || + (pmc->idx == ARMV8_PMU_CYCLE_IDX && (val & ARMV8_PMU_PMCR_LC)); } -/** - * kvm_pmu_pmc_is_chained - determine if the pmc is chained - * @pmc: The PMU counter pointer - */ -static bool kvm_pmu_pmc_is_chained(struct kvm_pmc *pmc) +static bool kvm_pmu_counter_can_chain(struct kvm_pmc *pmc) { - struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc); - - return test_bit(pmc->idx >> 1, vcpu->arch.pmu.chained); + return (!(pmc->idx & 1) && (pmc->idx + 1) < ARMV8_PMU_CYCLE_IDX && + !kvm_pmc_has_64bit_overflow(pmc)); } -/** - * kvm_pmu_idx_is_high_counter - determine if select_idx is a high/low counter - * @select_idx: The counter index - */ -static bool kvm_pmu_idx_is_high_counter(u64 select_idx) -{ - return select_idx & 0x1; -} - -/** - * kvm_pmu_get_canonical_pmc - obtain the canonical pmc - * @pmc: The PMU counter pointer - * - * When a pair of PMCs are chained together we use the low counter (canonical) - * to hold the underlying perf event. - */ -static struct kvm_pmc *kvm_pmu_get_canonical_pmc(struct kvm_pmc *pmc) -{ - if (kvm_pmu_pmc_is_chained(pmc) && - kvm_pmu_idx_is_high_counter(pmc->idx)) - return pmc - 1; - - return pmc; -} -static struct kvm_pmc *kvm_pmu_get_alternate_pmc(struct kvm_pmc *pmc) +static u32 counter_index_to_reg(u64 idx) { - if (kvm_pmu_idx_is_high_counter(pmc->idx)) - return pmc - 1; - else - return pmc + 1; + return (idx == ARMV8_PMU_CYCLE_IDX) ? PMCCNTR_EL0 : PMEVCNTR0_EL0 + idx; } -/** - * kvm_pmu_idx_has_chain_evtype - determine if the event type is chain - * @vcpu: The vcpu pointer - * @select_idx: The counter index - */ -static bool kvm_pmu_idx_has_chain_evtype(struct kvm_vcpu *vcpu, u64 select_idx) +static u32 counter_index_to_evtreg(u64 idx) { - u64 eventsel, reg; - - select_idx |= 0x1; - - if (select_idx == ARMV8_PMU_CYCLE_IDX) - return false; - - reg = PMEVTYPER0_EL0 + select_idx; - eventsel = __vcpu_sys_reg(vcpu, reg) & kvm_pmu_event_mask(vcpu->kvm); - - return eventsel == ARMV8_PMUV3_PERFCTR_CHAIN; + return (idx == ARMV8_PMU_CYCLE_IDX) ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + idx; } -/** - * kvm_pmu_get_pair_counter_value - get PMU counter value - * @vcpu: The vcpu pointer - * @pmc: The PMU counter pointer - */ -static u64 kvm_pmu_get_pair_counter_value(struct kvm_vcpu *vcpu, - struct kvm_pmc *pmc) +static u64 kvm_pmu_get_pmc_value(struct kvm_pmc *pmc) { - u64 counter, counter_high, reg, enabled, running; - - if (kvm_pmu_pmc_is_chained(pmc)) { - pmc = kvm_pmu_get_canonical_pmc(pmc); - reg = PMEVCNTR0_EL0 + pmc->idx; + struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc); + u64 counter, reg, enabled, running; - counter = __vcpu_sys_reg(vcpu, reg); - counter_high = __vcpu_sys_reg(vcpu, reg + 1); - - counter = lower_32_bits(counter) | (counter_high << 32); - } else { - reg = (pmc->idx == ARMV8_PMU_CYCLE_IDX) - ? PMCCNTR_EL0 : PMEVCNTR0_EL0 + pmc->idx; - counter = __vcpu_sys_reg(vcpu, reg); - } + reg = counter_index_to_reg(pmc->idx); + counter = __vcpu_sys_reg(vcpu, reg); /* * The real counter value is equal to the value of counter register plus @@ -163,6 +105,9 @@ static u64 kvm_pmu_get_pair_counter_value(struct kvm_vcpu *vcpu, counter += perf_event_read_value(pmc->perf_event, &enabled, &running); + if (!kvm_pmc_is_64bit(pmc)) + counter = lower_32_bits(counter); + return counter; } @@ -173,22 +118,37 @@ static u64 kvm_pmu_get_pair_counter_value(struct kvm_vcpu *vcpu, */ u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx) { - u64 counter; - struct kvm_pmu *pmu = &vcpu->arch.pmu; - struct kvm_pmc *pmc = &pmu->pmc[select_idx]; - if (!kvm_vcpu_has_pmu(vcpu)) return 0; - counter = kvm_pmu_get_pair_counter_value(vcpu, pmc); + return kvm_pmu_get_pmc_value(kvm_vcpu_idx_to_pmc(vcpu, select_idx)); +} - if (kvm_pmu_pmc_is_chained(pmc) && - kvm_pmu_idx_is_high_counter(select_idx)) - counter = upper_32_bits(counter); - else if (select_idx != ARMV8_PMU_CYCLE_IDX) - counter = lower_32_bits(counter); +static void kvm_pmu_set_pmc_value(struct kvm_pmc *pmc, u64 val, bool force) +{ + struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc); + u64 reg; - return counter; + kvm_pmu_release_perf_event(pmc); + + reg = counter_index_to_reg(pmc->idx); + + if (vcpu_mode_is_32bit(vcpu) && pmc->idx != ARMV8_PMU_CYCLE_IDX && + !force) { + /* + * Even with PMUv3p5, AArch32 cannot write to the top + * 32bit of the counters. The only possible course of + * action is to use PMCR.P, which will reset them to + * 0 (the only use of the 'force' parameter). + */ + val = __vcpu_sys_reg(vcpu, reg) & GENMASK(63, 32); + val |= lower_32_bits(val); + } + + __vcpu_sys_reg(vcpu, reg) = val; + + /* Recreate the perf event to reflect the updated sample_period */ + kvm_pmu_create_perf_event(pmc); } /** @@ -199,17 +159,10 @@ u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx) */ void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val) { - u64 reg; - if (!kvm_vcpu_has_pmu(vcpu)) return; - reg = (select_idx == ARMV8_PMU_CYCLE_IDX) - ? PMCCNTR_EL0 : PMEVCNTR0_EL0 + select_idx; - __vcpu_sys_reg(vcpu, reg) += (s64)val - kvm_pmu_get_counter_value(vcpu, select_idx); - - /* Recreate the perf event to reflect the updated sample_period */ - kvm_pmu_create_perf_event(vcpu, select_idx); + kvm_pmu_set_pmc_value(kvm_vcpu_idx_to_pmc(vcpu, select_idx), val, false); } /** @@ -218,7 +171,6 @@ void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val) */ static void kvm_pmu_release_perf_event(struct kvm_pmc *pmc) { - pmc = kvm_pmu_get_canonical_pmc(pmc); if (pmc->perf_event) { perf_event_disable(pmc->perf_event); perf_event_release_kernel(pmc->perf_event); @@ -232,29 +184,20 @@ static void kvm_pmu_release_perf_event(struct kvm_pmc *pmc) * * If this counter has been configured to monitor some event, release it here. */ -static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc) +static void kvm_pmu_stop_counter(struct kvm_pmc *pmc) { - u64 counter, reg, val; + struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc); + u64 reg, val; - pmc = kvm_pmu_get_canonical_pmc(pmc); if (!pmc->perf_event) return; - counter = kvm_pmu_get_pair_counter_value(vcpu, pmc); + val = kvm_pmu_get_pmc_value(pmc); - if (pmc->idx == ARMV8_PMU_CYCLE_IDX) { - reg = PMCCNTR_EL0; - val = counter; - } else { - reg = PMEVCNTR0_EL0 + pmc->idx; - val = lower_32_bits(counter); - } + reg = counter_index_to_reg(pmc->idx); __vcpu_sys_reg(vcpu, reg) = val; - if (kvm_pmu_pmc_is_chained(pmc)) - __vcpu_sys_reg(vcpu, reg + 1) = upper_32_bits(counter); - kvm_pmu_release_perf_event(pmc); } @@ -280,13 +223,10 @@ void kvm_pmu_vcpu_init(struct kvm_vcpu *vcpu) void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) { unsigned long mask = kvm_pmu_valid_counter_mask(vcpu); - struct kvm_pmu *pmu = &vcpu->arch.pmu; int i; for_each_set_bit(i, &mask, 32) - kvm_pmu_stop_counter(vcpu, &pmu->pmc[i]); - - bitmap_zero(vcpu->arch.pmu.chained, ARMV8_PMU_MAX_COUNTER_PAIRS); + kvm_pmu_stop_counter(kvm_vcpu_idx_to_pmc(vcpu, i)); } /** @@ -297,10 +237,9 @@ void kvm_pmu_vcpu_reset(struct kvm_vcpu *vcpu) void kvm_pmu_vcpu_destroy(struct kvm_vcpu *vcpu) { int i; - struct kvm_pmu *pmu = &vcpu->arch.pmu; for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) - kvm_pmu_release_perf_event(&pmu->pmc[i]); + kvm_pmu_release_perf_event(kvm_vcpu_idx_to_pmc(vcpu, i)); irq_work_sync(&vcpu->arch.pmu.overflow_work); } @@ -325,9 +264,6 @@ u64 kvm_pmu_valid_counter_mask(struct kvm_vcpu *vcpu) void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) { int i; - struct kvm_pmu *pmu = &vcpu->arch.pmu; - struct kvm_pmc *pmc; - if (!kvm_vcpu_has_pmu(vcpu)) return; @@ -335,17 +271,16 @@ void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) return; for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) { + struct kvm_pmc *pmc; + if (!(val & BIT(i))) continue; - pmc = &pmu->pmc[i]; - - /* A change in the enable state may affect the chain state */ - kvm_pmu_update_pmc_chained(vcpu, i); - kvm_pmu_create_perf_event(vcpu, i); + pmc = kvm_vcpu_idx_to_pmc(vcpu, i); - /* At this point, pmc must be the canonical */ - if (pmc->perf_event) { + if (!pmc->perf_event) { + kvm_pmu_create_perf_event(pmc); + } else { perf_event_enable(pmc->perf_event); if (pmc->perf_event->state != PERF_EVENT_STATE_ACTIVE) kvm_debug("fail to enable perf event\n"); @@ -363,23 +298,18 @@ void kvm_pmu_enable_counter_mask(struct kvm_vcpu *vcpu, u64 val) void kvm_pmu_disable_counter_mask(struct kvm_vcpu *vcpu, u64 val) { int i; - struct kvm_pmu *pmu = &vcpu->arch.pmu; - struct kvm_pmc *pmc; if (!kvm_vcpu_has_pmu(vcpu) || !val) return; for (i = 0; i < ARMV8_PMU_MAX_COUNTERS; i++) { + struct kvm_pmc *pmc; + if (!(val & BIT(i))) continue; - pmc = &pmu->pmc[i]; - - /* A change in the enable state may affect the chain state */ - kvm_pmu_update_pmc_chained(vcpu, i); - kvm_pmu_create_perf_event(vcpu, i); + pmc = kvm_vcpu_idx_to_pmc(vcpu, i); - /* At this point, pmc must be the canonical */ if (pmc->perf_event) perf_event_disable(pmc->perf_event); } @@ -476,14 +406,69 @@ void kvm_pmu_sync_hwstate(struct kvm_vcpu *vcpu) static void kvm_pmu_perf_overflow_notify_vcpu(struct irq_work *work) { struct kvm_vcpu *vcpu; - struct kvm_pmu *pmu; - - pmu = container_of(work, struct kvm_pmu, overflow_work); - vcpu = kvm_pmc_to_vcpu(pmu->pmc); + vcpu = container_of(work, struct kvm_vcpu, arch.pmu.overflow_work); kvm_vcpu_kick(vcpu); } +/* + * Perform an increment on any of the counters described in @mask, + * generating the overflow if required, and propagate it as a chained + * event if possible. + */ +static void kvm_pmu_counter_increment(struct kvm_vcpu *vcpu, + unsigned long mask, u32 event) +{ + int i; + + if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E)) + return; + + /* Weed out disabled counters */ + mask &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0); + + for_each_set_bit(i, &mask, ARMV8_PMU_CYCLE_IDX) { + struct kvm_pmc *pmc = kvm_vcpu_idx_to_pmc(vcpu, i); + u64 type, reg; + + /* Filter on event type */ + type = __vcpu_sys_reg(vcpu, counter_index_to_evtreg(i)); + type &= kvm_pmu_event_mask(vcpu->kvm); + if (type != event) + continue; + + /* Increment this counter */ + reg = __vcpu_sys_reg(vcpu, counter_index_to_reg(i)) + 1; + if (!kvm_pmc_is_64bit(pmc)) + reg = lower_32_bits(reg); + __vcpu_sys_reg(vcpu, counter_index_to_reg(i)) = reg; + + /* No overflow? move on */ + if (kvm_pmc_has_64bit_overflow(pmc) ? reg : lower_32_bits(reg)) + continue; + + /* Mark overflow */ + __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i); + + if (kvm_pmu_counter_can_chain(pmc)) + kvm_pmu_counter_increment(vcpu, BIT(i + 1), + ARMV8_PMUV3_PERFCTR_CHAIN); + } +} + +/* Compute the sample period for a given counter value */ +static u64 compute_period(struct kvm_pmc *pmc, u64 counter) +{ + u64 val; + + if (kvm_pmc_is_64bit(pmc) && kvm_pmc_has_64bit_overflow(pmc)) + val = (-counter) & GENMASK(63, 0); + else + val = (-counter) & GENMASK(31, 0); + + return val; +} + /** * When the perf event overflows, set the overflow status and inform the vcpu. */ @@ -503,10 +488,7 @@ static void kvm_pmu_perf_overflow(struct perf_event *perf_event, * Reset the sample period to the architectural limit, * i.e. the point where the counter overflows. */ - period = -(local64_read(&perf_event->count)); - - if (!kvm_pmu_idx_is_64bit(vcpu, pmc->idx)) - period &= GENMASK(31, 0); + period = compute_period(pmc, local64_read(&perf_event->count)); local64_set(&perf_event->hw.period_left, 0); perf_event->attr.sample_period = period; @@ -514,6 +496,10 @@ static void kvm_pmu_perf_overflow(struct perf_event *perf_event, __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(idx); + if (kvm_pmu_counter_can_chain(pmc)) + kvm_pmu_counter_increment(vcpu, BIT(idx + 1), + ARMV8_PMUV3_PERFCTR_CHAIN); + if (kvm_pmu_overflow_status(vcpu)) { kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu); @@ -533,50 +519,7 @@ static void kvm_pmu_perf_overflow(struct perf_event *perf_event, */ void kvm_pmu_software_increment(struct kvm_vcpu *vcpu, u64 val) { - struct kvm_pmu *pmu = &vcpu->arch.pmu; - int i; - - if (!kvm_vcpu_has_pmu(vcpu)) - return; - - if (!(__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E)) - return; - - /* Weed out disabled counters */ - val &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0); - - for (i = 0; i < ARMV8_PMU_CYCLE_IDX; i++) { - u64 type, reg; - - if (!(val & BIT(i))) - continue; - - /* PMSWINC only applies to ... SW_INC! */ - type = __vcpu_sys_reg(vcpu, PMEVTYPER0_EL0 + i); - type &= kvm_pmu_event_mask(vcpu->kvm); - if (type != ARMV8_PMUV3_PERFCTR_SW_INCR) - continue; - - /* increment this even SW_INC counter */ - reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) + 1; - reg = lower_32_bits(reg); - __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg; - - if (reg) /* no overflow on the low part */ - continue; - - if (kvm_pmu_pmc_is_chained(&pmu->pmc[i])) { - /* increment the high counter */ - reg = __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i + 1) + 1; - reg = lower_32_bits(reg); - __vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i + 1) = reg; - if (!reg) /* mark overflow on the high counter */ - __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i + 1); - } else { - /* mark overflow on low counter */ - __vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= BIT(i); - } - } + kvm_pmu_counter_increment(vcpu, val, ARMV8_PMUV3_PERFCTR_SW_INCR); } /** @@ -591,6 +534,12 @@ void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) if (!kvm_vcpu_has_pmu(vcpu)) return; + /* Fixup PMCR_EL0 to reconcile the PMU version and the LP bit */ + if (!kvm_pmu_is_3p5(vcpu)) + val &= ~ARMV8_PMU_PMCR_LP; + + __vcpu_sys_reg(vcpu, PMCR_EL0) = val; + if (val & ARMV8_PMU_PMCR_E) { kvm_pmu_enable_counter_mask(vcpu, __vcpu_sys_reg(vcpu, PMCNTENSET_EL0)); @@ -606,49 +555,44 @@ void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val) unsigned long mask = kvm_pmu_valid_counter_mask(vcpu); mask &= ~BIT(ARMV8_PMU_CYCLE_IDX); for_each_set_bit(i, &mask, 32) - kvm_pmu_set_counter_value(vcpu, i, 0); + kvm_pmu_set_pmc_value(kvm_vcpu_idx_to_pmc(vcpu, i), 0, true); } } -static bool kvm_pmu_counter_is_enabled(struct kvm_vcpu *vcpu, u64 select_idx) +static bool kvm_pmu_counter_is_enabled(struct kvm_pmc *pmc) { + struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc); return (__vcpu_sys_reg(vcpu, PMCR_EL0) & ARMV8_PMU_PMCR_E) && - (__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(select_idx)); + (__vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & BIT(pmc->idx)); } /** * kvm_pmu_create_perf_event - create a perf event for a counter - * @vcpu: The vcpu pointer - * @select_idx: The number of selected counter + * @pmc: Counter context */ -static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx) +static void kvm_pmu_create_perf_event(struct kvm_pmc *pmc) { + struct kvm_vcpu *vcpu = kvm_pmc_to_vcpu(pmc); struct arm_pmu *arm_pmu = vcpu->kvm->arch.arm_pmu; - struct kvm_pmu *pmu = &vcpu->arch.pmu; - struct kvm_pmc *pmc; struct perf_event *event; struct perf_event_attr attr; - u64 eventsel, counter, reg, data; + u64 eventsel, reg, data; - /* - * For chained counters the event type and filtering attributes are - * obtained from the low/even counter. We also use this counter to - * determine if the event is enabled/disabled. - */ - pmc = kvm_pmu_get_canonical_pmc(&pmu->pmc[select_idx]); - - reg = (pmc->idx == ARMV8_PMU_CYCLE_IDX) - ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + pmc->idx; + reg = counter_index_to_evtreg(pmc->idx); data = __vcpu_sys_reg(vcpu, reg); - kvm_pmu_stop_counter(vcpu, pmc); + kvm_pmu_stop_counter(pmc); if (pmc->idx == ARMV8_PMU_CYCLE_IDX) eventsel = ARMV8_PMUV3_PERFCTR_CPU_CYCLES; else eventsel = data & kvm_pmu_event_mask(vcpu->kvm); - /* Software increment event doesn't need to be backed by a perf event */ - if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR) + /* + * Neither SW increment nor chained events need to be backed + * by a perf event. + */ + if (eventsel == ARMV8_PMUV3_PERFCTR_SW_INCR || + eventsel == ARMV8_PMUV3_PERFCTR_CHAIN) return; /* @@ -663,37 +607,25 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx) attr.type = arm_pmu->pmu.type; attr.size = sizeof(attr); attr.pinned = 1; - attr.disabled = !kvm_pmu_counter_is_enabled(vcpu, pmc->idx); + attr.disabled = !kvm_pmu_counter_is_enabled(pmc); attr.exclude_user = data & ARMV8_PMU_EXCLUDE_EL0 ? 1 : 0; attr.exclude_kernel = data & ARMV8_PMU_EXCLUDE_EL1 ? 1 : 0; attr.exclude_hv = 1; /* Don't count EL2 events */ attr.exclude_host = 1; /* Don't count host events */ attr.config = eventsel; - counter = kvm_pmu_get_pair_counter_value(vcpu, pmc); - - if (kvm_pmu_pmc_is_chained(pmc)) { - /** - * The initial sample period (overflow count) of an event. For - * chained counters we only support overflow interrupts on the - * high counter. - */ - attr.sample_period = (-counter) & GENMASK(63, 0); - attr.config1 |= PERF_ATTR_CFG1_KVM_PMU_CHAINED; + /* + * If counting with a 64bit counter, advertise it to the perf + * code, carefully dealing with the initial sample period + * which also depends on the overflow. + */ + if (kvm_pmc_is_64bit(pmc)) + attr.config1 |= PERF_ATTR_CFG1_COUNTER_64BIT; - event = perf_event_create_kernel_counter(&attr, -1, current, - kvm_pmu_perf_overflow, - pmc + 1); - } else { - /* The initial sample period (overflow count) of an event. */ - if (kvm_pmu_idx_is_64bit(vcpu, pmc->idx)) - attr.sample_period = (-counter) & GENMASK(63, 0); - else - attr.sample_period = (-counter) & GENMASK(31, 0); + attr.sample_period = compute_period(pmc, kvm_pmu_get_pmc_value(pmc)); - event = perf_event_create_kernel_counter(&attr, -1, current, + event = perf_event_create_kernel_counter(&attr, -1, current, kvm_pmu_perf_overflow, pmc); - } if (IS_ERR(event)) { pr_err_once("kvm: pmu event creation failed %ld\n", @@ -705,41 +637,6 @@ static void kvm_pmu_create_perf_event(struct kvm_vcpu *vcpu, u64 select_idx) } /** - * kvm_pmu_update_pmc_chained - update chained bitmap - * @vcpu: The vcpu pointer - * @select_idx: The number of selected counter - * - * Update the chained bitmap based on the event type written in the - * typer register and the enable state of the odd register. - */ -static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx) -{ - struct kvm_pmu *pmu = &vcpu->arch.pmu; - struct kvm_pmc *pmc = &pmu->pmc[select_idx], *canonical_pmc; - bool new_state, old_state; - - old_state = kvm_pmu_pmc_is_chained(pmc); - new_state = kvm_pmu_idx_has_chain_evtype(vcpu, pmc->idx) && - kvm_pmu_counter_is_enabled(vcpu, pmc->idx | 0x1); - - if (old_state == new_state) - return; - - canonical_pmc = kvm_pmu_get_canonical_pmc(pmc); - kvm_pmu_stop_counter(vcpu, canonical_pmc); - if (new_state) { - /* - * During promotion from !chained to chained we must ensure - * the adjacent counter is stopped and its event destroyed - */ - kvm_pmu_stop_counter(vcpu, kvm_pmu_get_alternate_pmc(pmc)); - set_bit(pmc->idx >> 1, vcpu->arch.pmu.chained); - return; - } - clear_bit(pmc->idx >> 1, vcpu->arch.pmu.chained); -} - -/** * kvm_pmu_set_counter_event_type - set selected counter to monitor some event * @vcpu: The vcpu pointer * @data: The data guest writes to PMXEVTYPER_EL0 @@ -752,6 +649,7 @@ static void kvm_pmu_update_pmc_chained(struct kvm_vcpu *vcpu, u64 select_idx) void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, u64 select_idx) { + struct kvm_pmc *pmc = kvm_vcpu_idx_to_pmc(vcpu, select_idx); u64 reg, mask; if (!kvm_vcpu_has_pmu(vcpu)) @@ -761,20 +659,19 @@ void kvm_pmu_set_counter_event_type(struct kvm_vcpu *vcpu, u64 data, mask &= ~ARMV8_PMU_EVTYPE_EVENT; mask |= kvm_pmu_event_mask(vcpu->kvm); - reg = (select_idx == ARMV8_PMU_CYCLE_IDX) - ? PMCCFILTR_EL0 : PMEVTYPER0_EL0 + select_idx; + reg = counter_index_to_evtreg(pmc->idx); __vcpu_sys_reg(vcpu, reg) = data & mask; - kvm_pmu_update_pmc_chained(vcpu, select_idx); - kvm_pmu_create_perf_event(vcpu, select_idx); + kvm_pmu_create_perf_event(pmc); } void kvm_host_pmu_init(struct arm_pmu *pmu) { struct arm_pmu_entry *entry; - if (pmu->pmuver == 0 || pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) + if (pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_NI || + pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) return; mutex_lock(&arm_pmus_lock); @@ -827,7 +724,7 @@ static struct arm_pmu *kvm_pmu_probe_armpmu(void) if (event->pmu) { pmu = to_arm_pmu(event->pmu); - if (pmu->pmuver == 0 || + if (pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_NI || pmu->pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF) pmu = NULL; } @@ -849,6 +746,8 @@ u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) if (!pmceid1) { val = read_sysreg(pmceid0_el0); + /* always support CHAIN */ + val |= BIT(ARMV8_PMUV3_PERFCTR_CHAIN); base = 0; } else { val = read_sysreg(pmceid1_el0); @@ -1150,3 +1049,14 @@ int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr) return -ENXIO; } + +u8 kvm_arm_pmu_get_pmuver_limit(void) +{ + u64 tmp; + + tmp = read_sanitised_ftr_reg(SYS_ID_AA64DFR0_EL1); + tmp = cpuid_feature_cap_perfmon_field(tmp, + ID_AA64DFR0_EL1_PMUVer_SHIFT, + ID_AA64DFR0_EL1_PMUVer_V3P5); + return FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), tmp); +} diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 5ae18472205a..e0267f672b8a 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -395,32 +395,3 @@ int kvm_set_ipa_limit(void) return 0; } - -int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type) -{ - u64 mmfr0, mmfr1; - u32 phys_shift; - - if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) - return -EINVAL; - - phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); - if (phys_shift) { - if (phys_shift > kvm_ipa_limit || - phys_shift < ARM64_MIN_PARANGE_BITS) - return -EINVAL; - } else { - phys_shift = KVM_PHYS_SHIFT; - if (phys_shift > kvm_ipa_limit) { - pr_warn_once("%s using unsupported default IPA limit, upgrade your VMM\n", - current->comm); - return -EINVAL; - } - } - - mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); - mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); - kvm->arch.vtcr = kvm_get_vtcr(mmfr0, mmfr1, phys_shift); - - return 0; -} diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 608e4f25161d..d5ee52d6bf73 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -639,22 +639,18 @@ static void reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { - u64 pmcr, val; + u64 pmcr; /* No PMU available, PMCR_EL0 may UNDEF... */ if (!kvm_arm_support_pmu_v3()) return; - pmcr = read_sysreg(pmcr_el0); - /* - * Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) are reset to UNKNOWN - * except PMCR.E resetting to zero. - */ - val = ((pmcr & ~ARMV8_PMU_PMCR_MASK) - | (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E); + /* Only preserve PMCR_EL0.N, and reset the rest to 0 */ + pmcr = read_sysreg(pmcr_el0) & ARMV8_PMU_PMCR_N_MASK; if (!kvm_supports_32bit_el0()) - val |= ARMV8_PMU_PMCR_LC; - __vcpu_sys_reg(vcpu, r->reg) = val; + pmcr |= ARMV8_PMU_PMCR_LC; + + __vcpu_sys_reg(vcpu, r->reg) = pmcr; } static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags) @@ -697,13 +693,15 @@ static bool access_pmcr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, return false; if (p->is_write) { - /* Only update writeable bits of PMCR */ + /* + * Only update writeable bits of PMCR (continuing into + * kvm_pmu_handle_pmcr() as well) + */ val = __vcpu_sys_reg(vcpu, PMCR_EL0); val &= ~ARMV8_PMU_PMCR_MASK; val |= p->regval & ARMV8_PMU_PMCR_MASK; if (!kvm_supports_32bit_el0()) val |= ARMV8_PMU_PMCR_LC; - __vcpu_sys_reg(vcpu, PMCR_EL0) = val; kvm_pmu_handle_pmcr(vcpu, val); kvm_vcpu_pmu_restore_guest(vcpu); } else { @@ -1062,6 +1060,40 @@ static bool access_arch_timer(struct kvm_vcpu *vcpu, return true; } +static u8 vcpu_pmuver(const struct kvm_vcpu *vcpu) +{ + if (kvm_vcpu_has_pmu(vcpu)) + return vcpu->kvm->arch.dfr0_pmuver.imp; + + return vcpu->kvm->arch.dfr0_pmuver.unimp; +} + +static u8 perfmon_to_pmuver(u8 perfmon) +{ + switch (perfmon) { + case ID_DFR0_EL1_PerfMon_PMUv3: + return ID_AA64DFR0_EL1_PMUVer_IMP; + case ID_DFR0_EL1_PerfMon_IMPDEF: + return ID_AA64DFR0_EL1_PMUVer_IMP_DEF; + default: + /* Anything ARMv8.1+ and NI have the same value. For now. */ + return perfmon; + } +} + +static u8 pmuver_to_perfmon(u8 pmuver) +{ + switch (pmuver) { + case ID_AA64DFR0_EL1_PMUVer_IMP: + return ID_DFR0_EL1_PerfMon_PMUv3; + case ID_AA64DFR0_EL1_PMUVer_IMP_DEF: + return ID_DFR0_EL1_PerfMon_IMPDEF; + default: + /* Anything ARMv8.1+ and NI have the same value. For now. */ + return pmuver; + } +} + /* Read a sanitised cpufeature ID register by sys_reg_desc */ static u64 read_id_reg(const struct kvm_vcpu *vcpu, struct sys_reg_desc const *r) { @@ -1111,18 +1143,17 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu, struct sys_reg_desc const *r /* Limit debug to ARMv8.0 */ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer); val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_DebugVer), 6); - /* Limit guests to PMUv3 for ARMv8.4 */ - val = cpuid_feature_cap_perfmon_field(val, - ID_AA64DFR0_EL1_PMUVer_SHIFT, - kvm_vcpu_has_pmu(vcpu) ? ID_AA64DFR0_EL1_PMUVer_V3P4 : 0); + /* Set PMUver to the required version */ + val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer); + val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), + vcpu_pmuver(vcpu)); /* Hide SPE from guests */ val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMSVer); break; case SYS_ID_DFR0_EL1: - /* Limit guests to PMUv3 for ARMv8.4 */ - val = cpuid_feature_cap_perfmon_field(val, - ID_DFR0_EL1_PerfMon_SHIFT, - kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_EL1_PerfMon_PMUv3p4 : 0); + val &= ~ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon); + val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon), + pmuver_to_perfmon(vcpu_pmuver(vcpu))); break; } @@ -1222,6 +1253,85 @@ static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu, return 0; } +static int set_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, + const struct sys_reg_desc *rd, + u64 val) +{ + u8 pmuver, host_pmuver; + bool valid_pmu; + + host_pmuver = kvm_arm_pmu_get_pmuver_limit(); + + /* + * Allow AA64DFR0_EL1.PMUver to be set from userspace as long + * as it doesn't promise more than what the HW gives us. We + * allow an IMPDEF PMU though, only if no PMU is supported + * (KVM backward compatibility handling). + */ + pmuver = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), val); + if ((pmuver != ID_AA64DFR0_EL1_PMUVer_IMP_DEF && pmuver > host_pmuver)) + return -EINVAL; + + valid_pmu = (pmuver != 0 && pmuver != ID_AA64DFR0_EL1_PMUVer_IMP_DEF); + + /* Make sure view register and PMU support do match */ + if (kvm_vcpu_has_pmu(vcpu) != valid_pmu) + return -EINVAL; + + /* We can only differ with PMUver, and anything else is an error */ + val ^= read_id_reg(vcpu, rd); + val &= ~ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer); + if (val) + return -EINVAL; + + if (valid_pmu) + vcpu->kvm->arch.dfr0_pmuver.imp = pmuver; + else + vcpu->kvm->arch.dfr0_pmuver.unimp = pmuver; + + return 0; +} + +static int set_id_dfr0_el1(struct kvm_vcpu *vcpu, + const struct sys_reg_desc *rd, + u64 val) +{ + u8 perfmon, host_perfmon; + bool valid_pmu; + + host_perfmon = pmuver_to_perfmon(kvm_arm_pmu_get_pmuver_limit()); + + /* + * Allow DFR0_EL1.PerfMon to be set from userspace as long as + * it doesn't promise more than what the HW gives us on the + * AArch64 side (as everything is emulated with that), and + * that this is a PMUv3. + */ + perfmon = FIELD_GET(ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon), val); + if ((perfmon != ID_DFR0_EL1_PerfMon_IMPDEF && perfmon > host_perfmon) || + (perfmon != 0 && perfmon < ID_DFR0_EL1_PerfMon_PMUv3)) + return -EINVAL; + + valid_pmu = (perfmon != 0 && perfmon != ID_DFR0_EL1_PerfMon_IMPDEF); + + /* Make sure view register and PMU support do match */ + if (kvm_vcpu_has_pmu(vcpu) != valid_pmu) + return -EINVAL; + + /* We can only differ with PerfMon, and anything else is an error */ + val ^= read_id_reg(vcpu, rd); + val &= ~ARM64_FEATURE_MASK(ID_DFR0_EL1_PerfMon); + if (val) + return -EINVAL; + + if (valid_pmu) + vcpu->kvm->arch.dfr0_pmuver.imp = perfmon_to_pmuver(perfmon); + else + vcpu->kvm->arch.dfr0_pmuver.unimp = perfmon_to_pmuver(perfmon); + + return 0; +} + /* * cpufeature ID register user accessors * @@ -1443,7 +1553,9 @@ static const struct sys_reg_desc sys_reg_descs[] = { /* CRm=1 */ AA32_ID_SANITISED(ID_PFR0_EL1), AA32_ID_SANITISED(ID_PFR1_EL1), - AA32_ID_SANITISED(ID_DFR0_EL1), + { SYS_DESC(SYS_ID_DFR0_EL1), .access = access_id_reg, + .get_user = get_id_reg, .set_user = set_id_dfr0_el1, + .visibility = aa32_id_visibility, }, ID_HIDDEN(ID_AFR0_EL1), AA32_ID_SANITISED(ID_MMFR0_EL1), AA32_ID_SANITISED(ID_MMFR1_EL1), @@ -1483,7 +1595,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_UNALLOCATED(4,7), /* CRm=5 */ - ID_SANITISED(ID_AA64DFR0_EL1), + { SYS_DESC(SYS_ID_AA64DFR0_EL1), .access = access_id_reg, + .get_user = get_id_reg, .set_user = set_id_aa64dfr0_el1, }, ID_SANITISED(ID_AA64DFR1_EL1), ID_UNALLOCATED(5,2), ID_UNALLOCATED(5,3), diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index 733b53055f97..94a666dd1443 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -2743,6 +2743,7 @@ static int vgic_its_has_attr(struct kvm_device *dev, static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr) { const struct vgic_its_abi *abi = vgic_its_get_abi(its); + struct vgic_dist *dist = &kvm->arch.vgic; int ret = 0; if (attr == KVM_DEV_ARM_VGIC_CTRL_INIT) /* Nothing to do */ @@ -2762,7 +2763,9 @@ static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr) vgic_its_reset(kvm, its); break; case KVM_DEV_ARM_ITS_SAVE_TABLES: + dist->save_its_tables_in_progress = true; ret = abi->save_tables(its); + dist->save_its_tables_in_progress = false; break; case KVM_DEV_ARM_ITS_RESTORE_TABLES: ret = abi->restore_tables(its); @@ -2775,6 +2778,23 @@ static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr) return ret; } +/* + * kvm_arch_allow_write_without_running_vcpu - allow writing guest memory + * without the running VCPU when dirty ring is enabled. + * + * The running VCPU is required to track dirty guest pages when dirty ring + * is enabled. Otherwise, the backup bitmap should be used to track the + * dirty guest pages. When vgic/its tables are being saved, the backup + * bitmap is used to track the dirty guest pages due to the missed running + * VCPU in the period. + */ +bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm) +{ + struct vgic_dist *dist = &kvm->arch.vgic; + + return dist->save_its_tables_in_progress; +} + static int vgic_its_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) { diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c index 24913271e898..8dd5a8fe64b4 100644 --- a/arch/arm64/mm/copypage.c +++ b/arch/arm64/mm/copypage.c @@ -21,9 +21,12 @@ void copy_highpage(struct page *to, struct page *from) copy_page(kto, kfrom); - if (system_supports_mte() && test_bit(PG_mte_tagged, &from->flags)) { - set_bit(PG_mte_tagged, &to->flags); + if (system_supports_mte() && page_mte_tagged(from)) { + page_kasan_tag_reset(to); + /* It's a new page, shouldn't have been tagged yet */ + WARN_ON_ONCE(!try_page_mte_tagging(to)); mte_copy_page_tags(kto, kfrom); + set_page_mte_tagged(to); } } EXPORT_SYMBOL(copy_highpage); diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 3eb2825d08cf..596f46dabe4e 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -943,6 +943,8 @@ struct page *alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, void tag_clear_highpage(struct page *page) { + /* Newly allocated page, shouldn't have been tagged yet */ + WARN_ON_ONCE(!try_page_mte_tagging(page)); mte_zero_clear_page_tags(page_address(page)); - set_bit(PG_mte_tagged, &page->flags); + set_page_mte_tagged(page); } diff --git a/arch/arm64/mm/mteswap.c b/arch/arm64/mm/mteswap.c index bed803d8e158..cd508ba80ab1 100644 --- a/arch/arm64/mm/mteswap.c +++ b/arch/arm64/mm/mteswap.c @@ -24,7 +24,7 @@ int mte_save_tags(struct page *page) { void *tag_storage, *ret; - if (!test_bit(PG_mte_tagged, &page->flags)) + if (!page_mte_tagged(page)) return 0; tag_storage = mte_allocate_tag_storage(); @@ -46,21 +46,17 @@ int mte_save_tags(struct page *page) return 0; } -bool mte_restore_tags(swp_entry_t entry, struct page *page) +void mte_restore_tags(swp_entry_t entry, struct page *page) { void *tags = xa_load(&mte_pages, entry.val); if (!tags) - return false; + return; - /* - * Test PG_mte_tagged again in case it was racing with another - * set_pte_at(). - */ - if (!test_and_set_bit(PG_mte_tagged, &page->flags)) + if (try_page_mte_tagging(page)) { mte_restore_page_tags(page_address(page), tags); - - return true; + set_page_mte_tagged(page); + } } void mte_invalidate_tags(int type, pgoff_t offset) diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index e9744b41a226..4939f57b6f6a 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -598,7 +598,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_vcpu *vcpu, write_ok = true; } else { /* Call KVM generic code to do the slow-path check */ - pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL, + pfn = __gfn_to_pfn_memslot(memslot, gfn, false, false, NULL, writing, &write_ok, NULL); if (is_error_noslot_pfn(pfn)) return -EFAULT; diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index 5d5e12f3bf86..9d3743ca16d5 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -846,7 +846,7 @@ int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu, unsigned long pfn; /* Call KVM generic code to do the slow-path check */ - pfn = __gfn_to_pfn_memslot(memslot, gfn, false, NULL, + pfn = __gfn_to_pfn_memslot(memslot, gfn, false, false, NULL, writing, upgrade_p, NULL); if (is_error_noslot_pfn(pfn)) return -EFAULT; diff --git a/arch/powerpc/kvm/irq.h b/arch/powerpc/kvm/irq.h deleted file mode 100644 index e6463f866abc..000000000000 --- a/arch/powerpc/kvm/irq.h +++ /dev/null @@ -1,22 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef __IRQ_H -#define __IRQ_H - -#include <linux/kvm_host.h> - -static inline int irqchip_in_kernel(struct kvm *kvm) -{ - int ret = 0; - -#ifdef CONFIG_KVM_MPIC - ret = ret || (kvm->arch.mpic != NULL); -#endif -#ifdef CONFIG_KVM_XICS - ret = ret || (kvm->arch.xics != NULL); - ret = ret || (kvm->arch.xive != NULL); -#endif - smp_rmb(); - return ret; -} - -#endif diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index b850b0efa201..04494a4fb37a 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -36,7 +36,6 @@ #include <asm/setup.h> #include "timing.h" -#include "irq.h" #include "../mm/mmu_decl.h" #define CREATE_TRACE_POINTS @@ -2165,10 +2164,25 @@ static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo) return 0; } +bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) +{ + int ret = 0; + +#ifdef CONFIG_KVM_MPIC + ret = ret || (kvm->arch.mpic != NULL); +#endif +#ifdef CONFIG_KVM_XICS + ret = ret || (kvm->arch.xics != NULL); + ret = ret || (kvm->arch.xive != NULL); +#endif + smp_rmb(); + return ret; +} + int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event, bool line_status) { - if (!irqchip_in_kernel(kvm)) + if (!kvm_arch_irqchip_in_kernel(kvm)) return -ENXIO; irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index b1e98a9ed152..d67ce719d16a 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -142,8 +142,7 @@ struct mcck_volatile_info { CR14_EXTERNAL_DAMAGE_SUBMASK) #define SIDAD_SIZE_MASK 0xff -#define sida_origin(sie_block) \ - ((sie_block)->sidad & PAGE_MASK) +#define sida_addr(sie_block) phys_to_virt((sie_block)->sidad & PAGE_MASK) #define sida_size(sie_block) \ ((((sie_block)->sidad & SIDAD_SIZE_MASK) + 1) * PAGE_SIZE) @@ -276,6 +275,7 @@ struct kvm_s390_sie_block { #define ECB3_AES 0x04 #define ECB3_RI 0x01 __u8 ecb3; /* 0x0063 */ +#define ESCA_SCAOL_MASK ~0x3fU __u32 scaol; /* 0x0064 */ __u8 sdf; /* 0x0068 */ __u8 epdx; /* 0x0069 */ @@ -942,6 +942,8 @@ struct kvm_s390_pv { unsigned long stor_base; void *stor_var; bool dumping; + void *set_aside; + struct list_head need_cleanup; struct mmu_notifier mmu_notifier; }; @@ -1017,7 +1019,13 @@ void kvm_arch_crypto_clear_masks(struct kvm *kvm); void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, unsigned long *aqm, unsigned long *adm); -extern int sie64a(struct kvm_s390_sie_block *, u64 *); +int __sie64a(phys_addr_t sie_block_phys, struct kvm_s390_sie_block *sie_block, u64 *rsa); + +static inline int sie64a(struct kvm_s390_sie_block *sie_block, u64 *rsa) +{ + return __sie64a(virt_to_phys(sie_block), sie_block, rsa); +} + extern char sie_exit; extern int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc); diff --git a/arch/s390/include/asm/mem_encrypt.h b/arch/s390/include/asm/mem_encrypt.h index 08a8b96606d7..b85e13505a0f 100644 --- a/arch/s390/include/asm/mem_encrypt.h +++ b/arch/s390/include/asm/mem_encrypt.h @@ -4,8 +4,8 @@ #ifndef __ASSEMBLY__ -int set_memory_encrypted(unsigned long addr, int numpages); -int set_memory_decrypted(unsigned long addr, int numpages); +int set_memory_encrypted(unsigned long vaddr, int numpages); +int set_memory_decrypted(unsigned long vaddr, int numpages); #endif /* __ASSEMBLY__ */ diff --git a/arch/s390/include/asm/stacktrace.h b/arch/s390/include/asm/stacktrace.h index b23c658dce77..1802be5abb5d 100644 --- a/arch/s390/include/asm/stacktrace.h +++ b/arch/s390/include/asm/stacktrace.h @@ -46,6 +46,7 @@ struct stack_frame { unsigned long sie_savearea; unsigned long sie_reason; unsigned long sie_flags; + unsigned long sie_control_block_phys; }; }; unsigned long gprs[10]; diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h index be3ef9dd6972..28a9ad57b6f1 100644 --- a/arch/s390/include/asm/uv.h +++ b/arch/s390/include/asm/uv.h @@ -34,6 +34,7 @@ #define UVC_CMD_INIT_UV 0x000f #define UVC_CMD_CREATE_SEC_CONF 0x0100 #define UVC_CMD_DESTROY_SEC_CONF 0x0101 +#define UVC_CMD_DESTROY_SEC_CONF_FAST 0x0102 #define UVC_CMD_CREATE_SEC_CPU 0x0120 #define UVC_CMD_DESTROY_SEC_CPU 0x0121 #define UVC_CMD_CONV_TO_SEC_STOR 0x0200 @@ -81,6 +82,7 @@ enum uv_cmds_inst { BIT_UVC_CMD_UNSHARE_ALL = 20, BIT_UVC_CMD_PIN_PAGE_SHARED = 21, BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22, + BIT_UVC_CMD_DESTROY_SEC_CONF_FAST = 23, BIT_UVC_CMD_DUMP_INIT = 24, BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE = 25, BIT_UVC_CMD_DUMP_CPU = 26, @@ -230,6 +232,14 @@ struct uv_cb_nodata { u64 reserved20[4]; } __packed __aligned(8); +/* Destroy Configuration Fast */ +struct uv_cb_destroy_fast { + struct uv_cb_header header; + u64 reserved08[2]; + u64 handle; + u64 reserved20[5]; +} __packed __aligned(8); + /* Set Shared Access */ struct uv_cb_share { struct uv_cb_header header; diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index d8ce965c0a97..3f8e760298c2 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -62,6 +62,7 @@ int main(void) OFFSET(__SF_SIE_SAVEAREA, stack_frame, sie_savearea); OFFSET(__SF_SIE_REASON, stack_frame, sie_reason); OFFSET(__SF_SIE_FLAGS, stack_frame, sie_flags); + OFFSET(__SF_SIE_CONTROL_PHYS, stack_frame, sie_control_block_phys); DEFINE(STACK_FRAME_OVERHEAD, sizeof(struct stack_frame)); BLANK(); /* idle data offsets */ diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index e0d11f3adfcc..0f423e9df095 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -207,18 +207,20 @@ ENDPROC(__switch_to) #if IS_ENABLED(CONFIG_KVM) /* - * sie64a calling convention: - * %r2 pointer to sie control block - * %r3 guest register save area + * __sie64a calling convention: + * %r2 pointer to sie control block phys + * %r3 pointer to sie control block virt + * %r4 guest register save area */ -ENTRY(sie64a) +ENTRY(__sie64a) stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers lg %r12,__LC_CURRENT - stg %r2,__SF_SIE_CONTROL(%r15) # save control block pointer - stg %r3,__SF_SIE_SAVEAREA(%r15) # save guest register save area + stg %r2,__SF_SIE_CONTROL_PHYS(%r15) # save sie block physical.. + stg %r3,__SF_SIE_CONTROL(%r15) # ...and virtual addresses + stg %r4,__SF_SIE_SAVEAREA(%r15) # save guest register save area xc __SF_SIE_REASON(8,%r15),__SF_SIE_REASON(%r15) # reason code = 0 mvc __SF_SIE_FLAGS(8,%r15),__TI_flags(%r12) # copy thread flags - lmg %r0,%r13,0(%r3) # load guest gprs 0-13 + lmg %r0,%r13,0(%r4) # load guest gprs 0-13 lg %r14,__LC_GMAP # get gmap pointer ltgr %r14,%r14 jz .Lsie_gmap @@ -230,6 +232,7 @@ ENTRY(sie64a) jnz .Lsie_skip TSTMSK __LC_CPU_FLAGS,_CIF_FPU jo .Lsie_skip # exit if fp/vx regs changed + lg %r14,__SF_SIE_CONTROL_PHYS(%r15) # get sie block phys addr BPEXIT __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST) .Lsie_entry: sie 0(%r14) @@ -240,13 +243,14 @@ ENTRY(sie64a) BPOFF BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST) .Lsie_skip: + lg %r14,__SF_SIE_CONTROL(%r15) # get control block pointer ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE lctlg %c1,%c1,__LC_KERNEL_ASCE # load primary asce .Lsie_done: # some program checks are suppressing. C code (e.g. do_protection_exception) # will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There # are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable. -# Other instructions between sie64a and .Lsie_done should not cause program +# Other instructions between __sie64a and .Lsie_done should not cause program # interrupts. So lets use 3 nops as a landing pad for all possible rewinds. .Lrewind_pad6: nopr 7 @@ -275,8 +279,8 @@ sie_exit: EX_TABLE(.Lrewind_pad4,.Lsie_fault) EX_TABLE(.Lrewind_pad2,.Lsie_fault) EX_TABLE(sie_exit,.Lsie_fault) -ENDPROC(sie64a) -EXPORT_SYMBOL(sie64a) +ENDPROC(__sie64a) +EXPORT_SYMBOL(__sie64a) EXPORT_SYMBOL(sie_exit) #endif @@ -355,7 +359,7 @@ ENTRY(pgm_check_handler) j 3f # -> fault in user space .Lpgm_skip_asce: #if IS_ENABLED(CONFIG_KVM) - # cleanup critical section for program checks in sie64a + # cleanup critical section for program checks in __sie64a OUTSIDE %r9,.Lsie_gmap,.Lsie_done,1f SIEEXIT lghi %r10,_PIF_GUEST_FAULT diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index f9810d2a267c..9f18a4af9c13 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -255,6 +255,13 @@ static int make_secure_pte(pte_t *ptep, unsigned long addr, */ static bool should_export_before_import(struct uv_cb_header *uvcb, struct mm_struct *mm) { + /* + * The misc feature indicates, among other things, that importing a + * shared page from a different protected VM will automatically also + * transfer its ownership. + */ + if (test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications)) + return false; if (uvcb->cmd == UVC_CMD_UNPIN_PAGE_SHARED) return false; return atomic_read(&mm->context.protected_count) > 1; diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index 88112065d941..0ee02dae14b2 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -217,7 +217,7 @@ static int handle_itdb(struct kvm_vcpu *vcpu) return 0; if (current->thread.per_flags & PER_FLAG_NO_TE) return 0; - itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba; + itdb = phys_to_virt(vcpu->arch.sie_block->itdba); rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb)); if (rc) return rc; @@ -409,8 +409,7 @@ int handle_sthyi(struct kvm_vcpu *vcpu) out: if (!cc) { if (kvm_s390_pv_cpu_is_protected(vcpu)) { - memcpy((void *)(sida_origin(vcpu->arch.sie_block)), - sctns, PAGE_SIZE); + memcpy(sida_addr(vcpu->arch.sie_block), sctns, PAGE_SIZE); } else { r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE); if (r) { @@ -464,7 +463,7 @@ static int handle_operexc(struct kvm_vcpu *vcpu) static int handle_pv_spx(struct kvm_vcpu *vcpu) { - u32 pref = *(u32 *)vcpu->arch.sie_block->sidad; + u32 pref = *(u32 *)sida_addr(vcpu->arch.sie_block); kvm_s390_set_prefix(vcpu, pref); trace_kvm_s390_handle_prefix(vcpu, 1, pref); @@ -497,7 +496,7 @@ static int handle_pv_sclp(struct kvm_vcpu *vcpu) static int handle_pv_uvc(struct kvm_vcpu *vcpu) { - struct uv_cb_share *guest_uvcb = (void *)vcpu->arch.sie_block->sidad; + struct uv_cb_share *guest_uvcb = sida_addr(vcpu->arch.sie_block); struct uv_cb_cts uvcb = { .header.cmd = UVC_CMD_UNPIN_PAGE_SHARED, .header.len = sizeof(uvcb), diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index ab569faf0df2..1dae78deddf2 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -314,11 +314,6 @@ static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa) return READ_ONCE(gisa->ipm); } -static inline void gisa_clear_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc) -{ - clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa); -} - static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc) { return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa); diff --git a/arch/s390/kvm/irq.h b/arch/s390/kvm/irq.h deleted file mode 100644 index 484608c71dd0..000000000000 --- a/arch/s390/kvm/irq.h +++ /dev/null @@ -1,19 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * s390 irqchip routines - * - * Copyright IBM Corp. 2014 - * - * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> - */ -#ifndef __KVM_IRQ_H -#define __KVM_IRQ_H - -#include <linux/kvm_host.h> - -static inline int irqchip_in_kernel(struct kvm *kvm) -{ - return 1; -} - -#endif diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index bc491a73815c..e4890e04b210 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -210,6 +210,14 @@ module_param(diag9c_forwarding_hz, uint, 0644); MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off"); /* + * allow asynchronous deinit for protected guests; enable by default since + * the feature is opt-in anyway + */ +static int async_destroy = 1; +module_param(async_destroy, int, 0444); +MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests"); + +/* * For now we handle at most 16 double words as this is what the s390 base * kernel handles and stores in the prefix page. If we ever need to go beyond * this, this requires changes to code, but the external uapi can stay. @@ -616,6 +624,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_S390_BPB: r = test_facility(82); break; + case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE: + r = async_destroy && is_prot_virt_host(); + break; case KVM_CAP_S390_PROTECTED: r = is_prot_virt_host(); break; @@ -2519,9 +2530,13 @@ static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd, static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) { + const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM); + void __user *argp = (void __user *)cmd->data; int r = 0; u16 dummy; - void __user *argp = (void __user *)cmd->data; + + if (need_lock) + mutex_lock(&kvm->lock); switch (cmd->cmd) { case KVM_PV_ENABLE: { @@ -2555,6 +2570,31 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); break; } + case KVM_PV_ASYNC_CLEANUP_PREPARE: + r = -EINVAL; + if (!kvm_s390_pv_is_protected(kvm) || !async_destroy) + break; + + r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); + /* + * If a CPU could not be destroyed, destroy VM will also fail. + * There is no point in trying to destroy it. Instead return + * the rc and rrc from the first CPU that failed destroying. + */ + if (r) + break; + r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc); + + /* no need to block service interrupts any more */ + clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); + break; + case KVM_PV_ASYNC_CLEANUP_PERFORM: + r = -EINVAL; + if (!async_destroy) + break; + /* kvm->lock must not be held; this is asserted inside the function. */ + r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc); + break; case KVM_PV_DISABLE: { r = -EINVAL; if (!kvm_s390_pv_is_protected(kvm)) @@ -2568,7 +2608,7 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) */ if (r) break; - r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc); + r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc); /* no need to block service interrupts any more */ clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); @@ -2718,6 +2758,9 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) default: r = -ENOTTY; } + if (need_lock) + mutex_unlock(&kvm->lock); + return r; } @@ -2922,9 +2965,8 @@ long kvm_arch_vm_ioctl(struct file *filp, r = -EINVAL; break; } - mutex_lock(&kvm->lock); + /* must be called without kvm->lock */ r = kvm_s390_handle_pv(kvm, &args); - mutex_unlock(&kvm->lock); if (copy_to_user(argp, &args, sizeof(args))) { r = -EFAULT; break; @@ -3243,6 +3285,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) kvm_s390_vsie_init(kvm); if (use_gisa) kvm_s390_gisa_init(kvm); + INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup); + kvm->arch.pv.set_aside = NULL; KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid); return 0; @@ -3287,11 +3331,9 @@ void kvm_arch_destroy_vm(struct kvm *kvm) /* * We are already at the end of life and kvm->lock is not taken. * This is ok as the file descriptor is closed by now and nobody - * can mess with the pv state. To avoid lockdep_assert_held from - * complaining we do not use kvm_s390_pv_is_protected. + * can mess with the pv state. */ - if (kvm_s390_pv_get_handle(kvm)) - kvm_s390_pv_deinit_vm(kvm, &rc, &rrc); + kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc); /* * Remove the mmu notifier only when the whole KVM VM is torn down, * and only if one was registered to begin with. If the VM is @@ -3344,28 +3386,30 @@ static void sca_del_vcpu(struct kvm_vcpu *vcpu) static void sca_add_vcpu(struct kvm_vcpu *vcpu) { if (!kvm_s390_use_sca_entries()) { - struct bsca_block *sca = vcpu->kvm->arch.sca; + phys_addr_t sca_phys = virt_to_phys(vcpu->kvm->arch.sca); /* we still need the basic sca for the ipte control */ - vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); - vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; + vcpu->arch.sie_block->scaoh = sca_phys >> 32; + vcpu->arch.sie_block->scaol = sca_phys; return; } read_lock(&vcpu->kvm->arch.sca_lock); if (vcpu->kvm->arch.use_esca) { struct esca_block *sca = vcpu->kvm->arch.sca; + phys_addr_t sca_phys = virt_to_phys(sca); - sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; - vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); - vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU; + sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block); + vcpu->arch.sie_block->scaoh = sca_phys >> 32; + vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK; vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn); } else { struct bsca_block *sca = vcpu->kvm->arch.sca; + phys_addr_t sca_phys = virt_to_phys(sca); - sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block; - vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32); - vcpu->arch.sie_block->scaol = (__u32)(__u64)sca; + sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block); + vcpu->arch.sie_block->scaoh = sca_phys >> 32; + vcpu->arch.sie_block->scaol = sca_phys; set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn); } read_unlock(&vcpu->kvm->arch.sca_lock); @@ -3396,6 +3440,7 @@ static int sca_switch_to_extended(struct kvm *kvm) struct kvm_vcpu *vcpu; unsigned long vcpu_idx; u32 scaol, scaoh; + phys_addr_t new_sca_phys; if (kvm->arch.use_esca) return 0; @@ -3404,8 +3449,9 @@ static int sca_switch_to_extended(struct kvm *kvm) if (!new_sca) return -ENOMEM; - scaoh = (u32)((u64)(new_sca) >> 32); - scaol = (u32)(u64)(new_sca) & ~0x3fU; + new_sca_phys = virt_to_phys(new_sca); + scaoh = new_sca_phys >> 32; + scaol = new_sca_phys & ESCA_SCAOL_MASK; kvm_s390_vcpu_block_all(kvm); write_lock(&kvm->arch.sca_lock); @@ -3625,15 +3671,18 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) { - free_page(vcpu->arch.sie_block->cbrlo); + free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo)); vcpu->arch.sie_block->cbrlo = 0; } int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) { - vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL_ACCOUNT); - if (!vcpu->arch.sie_block->cbrlo) + void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); + + if (!cbrlo_page) return -ENOMEM; + + vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page); return 0; } @@ -3643,7 +3692,7 @@ static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) vcpu->arch.sie_block->ibc = model->ibc; if (test_kvm_facility(vcpu->kvm, 7)) - vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list; + vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list); } static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu) @@ -3700,9 +3749,8 @@ static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu) VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); } - vcpu->arch.sie_block->sdnxo = ((unsigned long) &vcpu->run->s.regs.sdnx) - | SDNXC; - vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb; + vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC; + vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb); if (sclp.has_kss) kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); @@ -3752,7 +3800,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) return -ENOMEM; vcpu->arch.sie_block = &sie_page->sie_block; - vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; + vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb); /* the real guest size will always be smaller than msl */ vcpu->arch.sie_block->mso = 0; @@ -5169,6 +5217,7 @@ static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu, struct kvm_s390_mem_op *mop) { void __user *uaddr = (void __user *)mop->buf; + void *sida_addr; int r = 0; if (mop->flags || !mop->size) @@ -5180,16 +5229,16 @@ static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu, if (!kvm_s390_pv_cpu_is_protected(vcpu)) return -EINVAL; + sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset; + switch (mop->op) { case KVM_S390_MEMOP_SIDA_READ: - if (copy_to_user(uaddr, (void *)(sida_origin(vcpu->arch.sie_block) + - mop->sida_offset), mop->size)) + if (copy_to_user(uaddr, sida_addr, mop->size)) r = -EFAULT; break; case KVM_S390_MEMOP_SIDA_WRITE: - if (copy_from_user((void *)(sida_origin(vcpu->arch.sie_block) + - mop->sida_offset), uaddr, mop->size)) + if (copy_from_user(sida_addr, uaddr, mop->size)) r = -EFAULT; break; } @@ -5567,6 +5616,11 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) return VM_FAULT_SIGBUS; } +bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) +{ + return true; +} + /* Section: memory related */ int kvm_arch_prepare_memory_region(struct kvm *kvm, const struct kvm_memory_slot *old, diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index 4755492dfabc..d48588c207d8 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -23,7 +23,8 @@ /* Transactional Memory Execution related macros */ #define IS_TE_ENABLED(vcpu) ((vcpu->arch.sie_block->ecb & ECB_TE)) #define TDB_FORMAT1 1 -#define IS_ITDB_VALID(vcpu) ((*(char *)vcpu->arch.sie_block->itdba == TDB_FORMAT1)) +#define IS_ITDB_VALID(vcpu) \ + ((*(char *)phys_to_virt((vcpu)->arch.sie_block->itdba) == TDB_FORMAT1)) extern debug_info_t *kvm_s390_dbf; extern debug_info_t *kvm_s390_dbf_uv; @@ -233,7 +234,7 @@ static inline unsigned long kvm_s390_get_gfn_end(struct kvm_memslots *slots) static inline u32 kvm_s390_get_gisa_desc(struct kvm *kvm) { - u32 gd = (u32)(u64)kvm->arch.gisa_int.origin; + u32 gd = virt_to_phys(kvm->arch.gisa_int.origin); if (gd && sclp.has_gisaf) gd |= GISA_FORMAT1; @@ -243,6 +244,9 @@ static inline u32 kvm_s390_get_gisa_desc(struct kvm *kvm) /* implemented in pv.c */ int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc); int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc); +int kvm_s390_pv_set_aside(struct kvm *kvm, u16 *rc, u16 *rrc); +int kvm_s390_pv_deinit_aside_vm(struct kvm *kvm, u16 *rc, u16 *rrc); +int kvm_s390_pv_deinit_cleanup_all(struct kvm *kvm, u16 *rc, u16 *rrc); int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc); int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc); int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc, diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 3335fa09b6f1..9f8a192bd750 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -924,8 +924,7 @@ static int handle_stsi(struct kvm_vcpu *vcpu) return -EREMOTE; } if (kvm_s390_pv_cpu_is_protected(vcpu)) { - memcpy((void *)sida_origin(vcpu->arch.sie_block), (void *)mem, - PAGE_SIZE); + memcpy(sida_addr(vcpu->arch.sie_block), (void *)mem, PAGE_SIZE); rc = 0; } else { rc = write_guest(vcpu, operand2, ar, (void *)mem, PAGE_SIZE); diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c index 7cb7799a0acb..e032ebbf51b9 100644 --- a/arch/s390/kvm/pv.c +++ b/arch/s390/kvm/pv.c @@ -18,6 +18,29 @@ #include <linux/mmu_notifier.h> #include "kvm-s390.h" +/** + * struct pv_vm_to_be_destroyed - Represents a protected VM that needs to + * be destroyed + * + * @list: list head for the list of leftover VMs + * @old_gmap_table: the gmap table of the leftover protected VM + * @handle: the handle of the leftover protected VM + * @stor_var: pointer to the variable storage of the leftover protected VM + * @stor_base: address of the base storage of the leftover protected VM + * + * Represents a protected VM that is still registered with the Ultravisor, + * but which does not correspond any longer to an active KVM VM. It should + * be destroyed at some point later, either asynchronously or when the + * process terminates. + */ +struct pv_vm_to_be_destroyed { + struct list_head list; + unsigned long old_gmap_table; + u64 handle; + void *stor_var; + unsigned long stor_base; +}; + static void kvm_s390_clear_pv_state(struct kvm *kvm) { kvm->arch.pv.handle = 0; @@ -44,7 +67,7 @@ int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc) free_pages(vcpu->arch.pv.stor_base, get_order(uv_info.guest_cpu_stor_len)); - free_page(sida_origin(vcpu->arch.sie_block)); + free_page((unsigned long)sida_addr(vcpu->arch.sie_block)); vcpu->arch.sie_block->pv_handle_cpu = 0; vcpu->arch.sie_block->pv_handle_config = 0; memset(&vcpu->arch.pv, 0, sizeof(vcpu->arch.pv)); @@ -66,6 +89,7 @@ int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc) .header.cmd = UVC_CMD_CREATE_SEC_CPU, .header.len = sizeof(uvcb), }; + void *sida_addr; int cc; if (kvm_s390_pv_cpu_get_handle(vcpu)) @@ -79,16 +103,17 @@ int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc) /* Input */ uvcb.guest_handle = kvm_s390_pv_get_handle(vcpu->kvm); uvcb.num = vcpu->arch.sie_block->icpua; - uvcb.state_origin = (u64)vcpu->arch.sie_block; - uvcb.stor_origin = (u64)vcpu->arch.pv.stor_base; + uvcb.state_origin = virt_to_phys(vcpu->arch.sie_block); + uvcb.stor_origin = virt_to_phys((void *)vcpu->arch.pv.stor_base); /* Alloc Secure Instruction Data Area Designation */ - vcpu->arch.sie_block->sidad = __get_free_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); - if (!vcpu->arch.sie_block->sidad) { + sida_addr = (void *)__get_free_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); + if (!sida_addr) { free_pages(vcpu->arch.pv.stor_base, get_order(uv_info.guest_cpu_stor_len)); return -ENOMEM; } + vcpu->arch.sie_block->sidad = virt_to_phys(sida_addr); cc = uv_call(0, (u64)&uvcb); *rc = uvcb.header.rc; @@ -159,23 +184,192 @@ out_err: return -ENOMEM; } -/* this should not fail, but if it does, we must not free the donated memory */ -int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc) +/** + * kvm_s390_pv_dispose_one_leftover - Clean up one leftover protected VM. + * @kvm: the KVM that was associated with this leftover protected VM + * @leftover: details about the leftover protected VM that needs a clean up + * @rc: the RC code of the Destroy Secure Configuration UVC + * @rrc: the RRC code of the Destroy Secure Configuration UVC + * + * Destroy one leftover protected VM. + * On success, kvm->mm->context.protected_count will be decremented atomically + * and all other resources used by the VM will be freed. + * + * Return: 0 in case of success, otherwise 1 + */ +static int kvm_s390_pv_dispose_one_leftover(struct kvm *kvm, + struct pv_vm_to_be_destroyed *leftover, + u16 *rc, u16 *rrc) { int cc; - cc = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), - UVC_CMD_DESTROY_SEC_CONF, rc, rrc); + /* It used the destroy-fast UVC, nothing left to do here */ + if (!leftover->handle) + goto done_fast; + cc = uv_cmd_nodata(leftover->handle, UVC_CMD_DESTROY_SEC_CONF, rc, rrc); + KVM_UV_EVENT(kvm, 3, "PROTVIRT DESTROY LEFTOVER VM: rc %x rrc %x", *rc, *rrc); + WARN_ONCE(cc, "protvirt destroy leftover vm failed rc %x rrc %x", *rc, *rrc); + if (cc) + return cc; + /* + * Intentionally leak unusable memory. If the UVC fails, the memory + * used for the VM and its metadata is permanently unusable. + * This can only happen in case of a serious KVM or hardware bug; it + * is not expected to happen in normal operation. + */ + free_pages(leftover->stor_base, get_order(uv_info.guest_base_stor_len)); + free_pages(leftover->old_gmap_table, CRST_ALLOC_ORDER); + vfree(leftover->stor_var); +done_fast: + atomic_dec(&kvm->mm->context.protected_count); + return 0; +} + +/** + * kvm_s390_destroy_lower_2g - Destroy the first 2GB of protected guest memory. + * @kvm: the VM whose memory is to be cleared. + * + * Destroy the first 2GB of guest memory, to avoid prefix issues after reboot. + * The CPUs of the protected VM need to be destroyed beforehand. + */ +static void kvm_s390_destroy_lower_2g(struct kvm *kvm) +{ + const unsigned long pages_2g = SZ_2G / PAGE_SIZE; + struct kvm_memory_slot *slot; + unsigned long len; + int srcu_idx; + + srcu_idx = srcu_read_lock(&kvm->srcu); + + /* Take the memslot containing guest absolute address 0 */ + slot = gfn_to_memslot(kvm, 0); + /* Clear all slots or parts thereof that are below 2GB */ + while (slot && slot->base_gfn < pages_2g) { + len = min_t(u64, slot->npages, pages_2g - slot->base_gfn) * PAGE_SIZE; + s390_uv_destroy_range(kvm->mm, slot->userspace_addr, slot->userspace_addr + len); + /* Take the next memslot */ + slot = gfn_to_memslot(kvm, slot->base_gfn + slot->npages); + } + + srcu_read_unlock(&kvm->srcu, srcu_idx); +} + +static int kvm_s390_pv_deinit_vm_fast(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + struct uv_cb_destroy_fast uvcb = { + .header.cmd = UVC_CMD_DESTROY_SEC_CONF_FAST, + .header.len = sizeof(uvcb), + .handle = kvm_s390_pv_get_handle(kvm), + }; + int cc; + + cc = uv_call_sched(0, (u64)&uvcb); + if (rc) + *rc = uvcb.header.rc; + if (rrc) + *rrc = uvcb.header.rrc; WRITE_ONCE(kvm->arch.gmap->guest_handle, 0); + KVM_UV_EVENT(kvm, 3, "PROTVIRT DESTROY VM FAST: rc %x rrc %x", + uvcb.header.rc, uvcb.header.rrc); + WARN_ONCE(cc, "protvirt destroy vm fast failed handle %llx rc %x rrc %x", + kvm_s390_pv_get_handle(kvm), uvcb.header.rc, uvcb.header.rrc); + /* Inteded memory leak on "impossible" error */ + if (!cc) + kvm_s390_pv_dealloc_vm(kvm); + return cc ? -EIO : 0; +} + +static inline bool is_destroy_fast_available(void) +{ + return test_bit_inv(BIT_UVC_CMD_DESTROY_SEC_CONF_FAST, uv_info.inst_calls_list); +} + +/** + * kvm_s390_pv_set_aside - Set aside a protected VM for later teardown. + * @kvm: the VM + * @rc: return value for the RC field of the UVCB + * @rrc: return value for the RRC field of the UVCB + * + * Set aside the protected VM for a subsequent teardown. The VM will be able + * to continue immediately as a non-secure VM, and the information needed to + * properly tear down the protected VM is set aside. If another protected VM + * was already set aside without starting its teardown, this function will + * fail. + * The CPUs of the protected VM need to be destroyed beforehand. + * + * Context: kvm->lock needs to be held + * + * Return: 0 in case of success, -EINVAL if another protected VM was already set + * aside, -ENOMEM if the system ran out of memory. + */ +int kvm_s390_pv_set_aside(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + struct pv_vm_to_be_destroyed *priv; + int res = 0; + + lockdep_assert_held(&kvm->lock); /* - * if the mm still has a mapping, make all its pages accessible - * before destroying the guest + * If another protected VM was already prepared for teardown, refuse. + * A normal deinitialization has to be performed instead. */ - if (mmget_not_zero(kvm->mm)) { - s390_uv_destroy_range(kvm->mm, 0, TASK_SIZE); - mmput(kvm->mm); + if (kvm->arch.pv.set_aside) + return -EINVAL; + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + if (is_destroy_fast_available()) { + res = kvm_s390_pv_deinit_vm_fast(kvm, rc, rrc); + } else { + priv->stor_var = kvm->arch.pv.stor_var; + priv->stor_base = kvm->arch.pv.stor_base; + priv->handle = kvm_s390_pv_get_handle(kvm); + priv->old_gmap_table = (unsigned long)kvm->arch.gmap->table; + WRITE_ONCE(kvm->arch.gmap->guest_handle, 0); + if (s390_replace_asce(kvm->arch.gmap)) + res = -ENOMEM; } + if (res) { + kfree(priv); + return res; + } + + kvm_s390_destroy_lower_2g(kvm); + kvm_s390_clear_pv_state(kvm); + kvm->arch.pv.set_aside = priv; + + *rc = UVC_RC_EXECUTED; + *rrc = 42; + return 0; +} + +/** + * kvm_s390_pv_deinit_vm - Deinitialize the current protected VM + * @kvm: the KVM whose protected VM needs to be deinitialized + * @rc: the RC code of the UVC + * @rrc: the RRC code of the UVC + * + * Deinitialize the current protected VM. This function will destroy and + * cleanup the current protected VM, but it will not cleanup the guest + * memory. This function should only be called when the protected VM has + * just been created and therefore does not have any guest memory, or when + * the caller cleans up the guest memory separately. + * + * This function should not fail, but if it does, the donated memory must + * not be freed. + * + * Context: kvm->lock needs to be held + * + * Return: 0 in case of success, otherwise -EIO + */ +int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + int cc; + + cc = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), + UVC_CMD_DESTROY_SEC_CONF, rc, rrc); + WRITE_ONCE(kvm->arch.gmap->guest_handle, 0); if (!cc) { atomic_dec(&kvm->mm->context.protected_count); kvm_s390_pv_dealloc_vm(kvm); @@ -189,11 +383,137 @@ int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc) return cc ? -EIO : 0; } +/** + * kvm_s390_pv_deinit_cleanup_all - Clean up all protected VMs associated + * with a specific KVM. + * @kvm: the KVM to be cleaned up + * @rc: the RC code of the first failing UVC + * @rrc: the RRC code of the first failing UVC + * + * This function will clean up all protected VMs associated with a KVM. + * This includes the active one, the one prepared for deinitialization with + * kvm_s390_pv_set_aside, and any still pending in the need_cleanup list. + * + * Context: kvm->lock needs to be held unless being called from + * kvm_arch_destroy_vm. + * + * Return: 0 if all VMs are successfully cleaned up, otherwise -EIO + */ +int kvm_s390_pv_deinit_cleanup_all(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + struct pv_vm_to_be_destroyed *cur; + bool need_zap = false; + u16 _rc, _rrc; + int cc = 0; + + /* Make sure the counter does not reach 0 before calling s390_uv_destroy_range */ + atomic_inc(&kvm->mm->context.protected_count); + + *rc = 1; + /* If the current VM is protected, destroy it */ + if (kvm_s390_pv_get_handle(kvm)) { + cc = kvm_s390_pv_deinit_vm(kvm, rc, rrc); + need_zap = true; + } + + /* If a previous protected VM was set aside, put it in the need_cleanup list */ + if (kvm->arch.pv.set_aside) { + list_add(kvm->arch.pv.set_aside, &kvm->arch.pv.need_cleanup); + kvm->arch.pv.set_aside = NULL; + } + + /* Cleanup all protected VMs in the need_cleanup list */ + while (!list_empty(&kvm->arch.pv.need_cleanup)) { + cur = list_first_entry(&kvm->arch.pv.need_cleanup, typeof(*cur), list); + need_zap = true; + if (kvm_s390_pv_dispose_one_leftover(kvm, cur, &_rc, &_rrc)) { + cc = 1; + /* + * Only return the first error rc and rrc, so make + * sure it is not overwritten. All destroys will + * additionally be reported via KVM_UV_EVENT(). + */ + if (*rc == UVC_RC_EXECUTED) { + *rc = _rc; + *rrc = _rrc; + } + } + list_del(&cur->list); + kfree(cur); + } + + /* + * If the mm still has a mapping, try to mark all its pages as + * accessible. The counter should not reach zero before this + * cleanup has been performed. + */ + if (need_zap && mmget_not_zero(kvm->mm)) { + s390_uv_destroy_range(kvm->mm, 0, TASK_SIZE); + mmput(kvm->mm); + } + + /* Now the counter can safely reach 0 */ + atomic_dec(&kvm->mm->context.protected_count); + return cc ? -EIO : 0; +} + +/** + * kvm_s390_pv_deinit_aside_vm - Teardown a previously set aside protected VM. + * @kvm: the VM previously associated with the protected VM + * @rc: return value for the RC field of the UVCB + * @rrc: return value for the RRC field of the UVCB + * + * Tear down the protected VM that had been previously prepared for teardown + * using kvm_s390_pv_set_aside_vm. Ideally this should be called by + * userspace asynchronously from a separate thread. + * + * Context: kvm->lock must not be held. + * + * Return: 0 in case of success, -EINVAL if no protected VM had been + * prepared for asynchronous teardowm, -EIO in case of other errors. + */ +int kvm_s390_pv_deinit_aside_vm(struct kvm *kvm, u16 *rc, u16 *rrc) +{ + struct pv_vm_to_be_destroyed *p; + int ret = 0; + + lockdep_assert_not_held(&kvm->lock); + mutex_lock(&kvm->lock); + p = kvm->arch.pv.set_aside; + kvm->arch.pv.set_aside = NULL; + mutex_unlock(&kvm->lock); + if (!p) + return -EINVAL; + + /* When a fatal signal is received, stop immediately */ + if (s390_uv_destroy_range_interruptible(kvm->mm, 0, TASK_SIZE_MAX)) + goto done; + if (kvm_s390_pv_dispose_one_leftover(kvm, p, rc, rrc)) + ret = -EIO; + kfree(p); + p = NULL; +done: + /* + * p is not NULL if we aborted because of a fatal signal, in which + * case queue the leftover for later cleanup. + */ + if (p) { + mutex_lock(&kvm->lock); + list_add(&p->list, &kvm->arch.pv.need_cleanup); + mutex_unlock(&kvm->lock); + /* Did not finish, but pretend things went well */ + *rc = UVC_RC_EXECUTED; + *rrc = 42; + } + return ret; +} + static void kvm_s390_pv_mmu_notifier_release(struct mmu_notifier *subscription, struct mm_struct *mm) { struct kvm *kvm = container_of(subscription, struct kvm, arch.pv.mmu_notifier); u16 dummy; + int r; /* * No locking is needed since this is the last thread of the last user of this @@ -202,7 +522,9 @@ static void kvm_s390_pv_mmu_notifier_release(struct mmu_notifier *subscription, * unregistered. This means that if this notifier runs, then the * struct kvm is still valid. */ - kvm_s390_cpus_from_pv(kvm, &dummy, &dummy); + r = kvm_s390_cpus_from_pv(kvm, &dummy, &dummy); + if (!r && is_destroy_fast_available() && kvm_s390_pv_get_handle(kvm)) + kvm_s390_pv_deinit_vm_fast(kvm, &dummy, &dummy); } static const struct mmu_notifier_ops kvm_s390_pv_mmu_notifier_ops = { @@ -226,8 +548,9 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc) uvcb.guest_stor_origin = 0; /* MSO is 0 for KVM */ uvcb.guest_stor_len = kvm->arch.pv.guest_len; uvcb.guest_asce = kvm->arch.gmap->asce; - uvcb.guest_sca = (unsigned long)kvm->arch.sca; - uvcb.conf_base_stor_origin = (u64)kvm->arch.pv.stor_base; + uvcb.guest_sca = virt_to_phys(kvm->arch.sca); + uvcb.conf_base_stor_origin = + virt_to_phys((void *)kvm->arch.pv.stor_base); uvcb.conf_virt_stor_origin = (u64)kvm->arch.pv.stor_var; cc = uv_call_sched(0, (u64)&uvcb); diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index ace2541ababd..b6a0219e470a 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -656,7 +656,7 @@ static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa) page = gfn_to_page(kvm, gpa_to_gfn(gpa)); if (is_error_page(page)) return -EINVAL; - *hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK); + *hpa = (hpa_t)page_to_phys(page) + (gpa & ~PAGE_MASK); return 0; } @@ -871,7 +871,7 @@ static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, WARN_ON_ONCE(rc); return 1; } - vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa; + vsie_page->scb_o = phys_to_virt(hpa); return 0; } diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 8947451ae021..74e1d873dce0 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -72,7 +72,7 @@ static struct gmap *gmap_alloc(unsigned long limit) goto out_free; page->index = 0; list_add(&page->lru, &gmap->crst_list); - table = (unsigned long *) page_to_phys(page); + table = page_to_virt(page); crst_table_init(table, etype); gmap->table = table; gmap->asce = atype | _ASCE_TABLE_LENGTH | @@ -311,12 +311,12 @@ static int gmap_alloc_table(struct gmap *gmap, unsigned long *table, page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER); if (!page) return -ENOMEM; - new = (unsigned long *) page_to_phys(page); + new = page_to_virt(page); crst_table_init(new, init); spin_lock(&gmap->guest_table_lock); if (*table & _REGION_ENTRY_INVALID) { list_add(&page->lru, &gmap->crst_list); - *table = (unsigned long) new | _REGION_ENTRY_LENGTH | + *table = __pa(new) | _REGION_ENTRY_LENGTH | (*table & _REGION_ENTRY_TYPE_MASK); page->index = gaddr; page = NULL; @@ -556,7 +556,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr) gmap_alloc_table(gmap, table, _REGION2_ENTRY_EMPTY, gaddr & _REGION1_MASK)) return -ENOMEM; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = __va(*table & _REGION_ENTRY_ORIGIN); } if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION2) { table += (gaddr & _REGION2_INDEX) >> _REGION2_SHIFT; @@ -564,7 +564,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr) gmap_alloc_table(gmap, table, _REGION3_ENTRY_EMPTY, gaddr & _REGION2_MASK)) return -ENOMEM; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = __va(*table & _REGION_ENTRY_ORIGIN); } if ((gmap->asce & _ASCE_TYPE_MASK) >= _ASCE_TYPE_REGION3) { table += (gaddr & _REGION3_INDEX) >> _REGION3_SHIFT; @@ -572,7 +572,7 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr) gmap_alloc_table(gmap, table, _SEGMENT_ENTRY_EMPTY, gaddr & _REGION3_MASK)) return -ENOMEM; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = __va(*table & _REGION_ENTRY_ORIGIN); } table += (gaddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT; /* Walk the parent mm page table */ @@ -812,7 +812,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap, break; if (*table & _REGION_ENTRY_INVALID) return NULL; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = __va(*table & _REGION_ENTRY_ORIGIN); fallthrough; case _ASCE_TYPE_REGION2: table += (gaddr & _REGION2_INDEX) >> _REGION2_SHIFT; @@ -820,7 +820,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap, break; if (*table & _REGION_ENTRY_INVALID) return NULL; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = __va(*table & _REGION_ENTRY_ORIGIN); fallthrough; case _ASCE_TYPE_REGION3: table += (gaddr & _REGION3_INDEX) >> _REGION3_SHIFT; @@ -828,7 +828,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap, break; if (*table & _REGION_ENTRY_INVALID) return NULL; - table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN); + table = __va(*table & _REGION_ENTRY_ORIGIN); fallthrough; case _ASCE_TYPE_SEGMENT: table += (gaddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT; @@ -836,7 +836,7 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap, break; if (*table & _REGION_ENTRY_INVALID) return NULL; - table = (unsigned long *)(*table & _SEGMENT_ENTRY_ORIGIN); + table = __va(*table & _SEGMENT_ENTRY_ORIGIN); table += (gaddr & _PAGE_INDEX) >> _PAGE_SHIFT; } return table; @@ -1149,7 +1149,7 @@ int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val) if (pte_present(pte) && (pte_val(pte) & _PAGE_READ)) { address = pte_val(pte) & PAGE_MASK; address += gaddr & ~PAGE_MASK; - *val = *(unsigned long *) address; + *val = *(unsigned long *)__va(address); set_pte(ptep, set_pte_bit(*ptep, __pgprot(_PAGE_YOUNG))); /* Do *NOT* clear the _PAGE_INVALID bit! */ rc = 0; @@ -1334,7 +1334,8 @@ static void __gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr, */ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr) { - unsigned long sto, *ste, *pgt; + unsigned long *ste; + phys_addr_t sto, pgt; struct page *page; BUG_ON(!gmap_is_shadow(sg)); @@ -1342,13 +1343,13 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr) if (!ste || !(*ste & _SEGMENT_ENTRY_ORIGIN)) return; gmap_call_notifier(sg, raddr, raddr + _SEGMENT_SIZE - 1); - sto = (unsigned long) (ste - ((raddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT)); + sto = __pa(ste - ((raddr & _SEGMENT_INDEX) >> _SEGMENT_SHIFT)); gmap_idte_one(sto | _ASCE_TYPE_SEGMENT, raddr); - pgt = (unsigned long *)(*ste & _SEGMENT_ENTRY_ORIGIN); + pgt = *ste & _SEGMENT_ENTRY_ORIGIN; *ste = _SEGMENT_ENTRY_EMPTY; - __gmap_unshadow_pgt(sg, raddr, pgt); + __gmap_unshadow_pgt(sg, raddr, __va(pgt)); /* Free page table */ - page = pfn_to_page(__pa(pgt) >> PAGE_SHIFT); + page = phys_to_page(pgt); list_del(&page->lru); page_table_free_pgste(page); } @@ -1364,19 +1365,19 @@ static void gmap_unshadow_pgt(struct gmap *sg, unsigned long raddr) static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr, unsigned long *sgt) { - unsigned long *pgt; struct page *page; + phys_addr_t pgt; int i; BUG_ON(!gmap_is_shadow(sg)); for (i = 0; i < _CRST_ENTRIES; i++, raddr += _SEGMENT_SIZE) { if (!(sgt[i] & _SEGMENT_ENTRY_ORIGIN)) continue; - pgt = (unsigned long *)(sgt[i] & _REGION_ENTRY_ORIGIN); + pgt = sgt[i] & _REGION_ENTRY_ORIGIN; sgt[i] = _SEGMENT_ENTRY_EMPTY; - __gmap_unshadow_pgt(sg, raddr, pgt); + __gmap_unshadow_pgt(sg, raddr, __va(pgt)); /* Free page table */ - page = pfn_to_page(__pa(pgt) >> PAGE_SHIFT); + page = phys_to_page(pgt); list_del(&page->lru); page_table_free_pgste(page); } @@ -1391,7 +1392,8 @@ static void __gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr, */ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr) { - unsigned long r3o, *r3e, *sgt; + unsigned long r3o, *r3e; + phys_addr_t sgt; struct page *page; BUG_ON(!gmap_is_shadow(sg)); @@ -1400,12 +1402,12 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr) return; gmap_call_notifier(sg, raddr, raddr + _REGION3_SIZE - 1); r3o = (unsigned long) (r3e - ((raddr & _REGION3_INDEX) >> _REGION3_SHIFT)); - gmap_idte_one(r3o | _ASCE_TYPE_REGION3, raddr); - sgt = (unsigned long *)(*r3e & _REGION_ENTRY_ORIGIN); + gmap_idte_one(__pa(r3o) | _ASCE_TYPE_REGION3, raddr); + sgt = *r3e & _REGION_ENTRY_ORIGIN; *r3e = _REGION3_ENTRY_EMPTY; - __gmap_unshadow_sgt(sg, raddr, sgt); + __gmap_unshadow_sgt(sg, raddr, __va(sgt)); /* Free segment table */ - page = pfn_to_page(__pa(sgt) >> PAGE_SHIFT); + page = phys_to_page(sgt); list_del(&page->lru); __free_pages(page, CRST_ALLOC_ORDER); } @@ -1421,19 +1423,19 @@ static void gmap_unshadow_sgt(struct gmap *sg, unsigned long raddr) static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr, unsigned long *r3t) { - unsigned long *sgt; struct page *page; + phys_addr_t sgt; int i; BUG_ON(!gmap_is_shadow(sg)); for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION3_SIZE) { if (!(r3t[i] & _REGION_ENTRY_ORIGIN)) continue; - sgt = (unsigned long *)(r3t[i] & _REGION_ENTRY_ORIGIN); + sgt = r3t[i] & _REGION_ENTRY_ORIGIN; r3t[i] = _REGION3_ENTRY_EMPTY; - __gmap_unshadow_sgt(sg, raddr, sgt); + __gmap_unshadow_sgt(sg, raddr, __va(sgt)); /* Free segment table */ - page = pfn_to_page(__pa(sgt) >> PAGE_SHIFT); + page = phys_to_page(sgt); list_del(&page->lru); __free_pages(page, CRST_ALLOC_ORDER); } @@ -1448,7 +1450,8 @@ static void __gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr, */ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr) { - unsigned long r2o, *r2e, *r3t; + unsigned long r2o, *r2e; + phys_addr_t r3t; struct page *page; BUG_ON(!gmap_is_shadow(sg)); @@ -1457,12 +1460,12 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr) return; gmap_call_notifier(sg, raddr, raddr + _REGION2_SIZE - 1); r2o = (unsigned long) (r2e - ((raddr & _REGION2_INDEX) >> _REGION2_SHIFT)); - gmap_idte_one(r2o | _ASCE_TYPE_REGION2, raddr); - r3t = (unsigned long *)(*r2e & _REGION_ENTRY_ORIGIN); + gmap_idte_one(__pa(r2o) | _ASCE_TYPE_REGION2, raddr); + r3t = *r2e & _REGION_ENTRY_ORIGIN; *r2e = _REGION2_ENTRY_EMPTY; - __gmap_unshadow_r3t(sg, raddr, r3t); + __gmap_unshadow_r3t(sg, raddr, __va(r3t)); /* Free region 3 table */ - page = pfn_to_page(__pa(r3t) >> PAGE_SHIFT); + page = phys_to_page(r3t); list_del(&page->lru); __free_pages(page, CRST_ALLOC_ORDER); } @@ -1478,7 +1481,7 @@ static void gmap_unshadow_r3t(struct gmap *sg, unsigned long raddr) static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr, unsigned long *r2t) { - unsigned long *r3t; + phys_addr_t r3t; struct page *page; int i; @@ -1486,11 +1489,11 @@ static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr, for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION2_SIZE) { if (!(r2t[i] & _REGION_ENTRY_ORIGIN)) continue; - r3t = (unsigned long *)(r2t[i] & _REGION_ENTRY_ORIGIN); + r3t = r2t[i] & _REGION_ENTRY_ORIGIN; r2t[i] = _REGION2_ENTRY_EMPTY; - __gmap_unshadow_r3t(sg, raddr, r3t); + __gmap_unshadow_r3t(sg, raddr, __va(r3t)); /* Free region 3 table */ - page = pfn_to_page(__pa(r3t) >> PAGE_SHIFT); + page = phys_to_page(r3t); list_del(&page->lru); __free_pages(page, CRST_ALLOC_ORDER); } @@ -1505,8 +1508,9 @@ static void __gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr, */ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr) { - unsigned long r1o, *r1e, *r2t; + unsigned long r1o, *r1e; struct page *page; + phys_addr_t r2t; BUG_ON(!gmap_is_shadow(sg)); r1e = gmap_table_walk(sg, raddr, 4); /* get region-1 pointer */ @@ -1514,12 +1518,12 @@ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr) return; gmap_call_notifier(sg, raddr, raddr + _REGION1_SIZE - 1); r1o = (unsigned long) (r1e - ((raddr & _REGION1_INDEX) >> _REGION1_SHIFT)); - gmap_idte_one(r1o | _ASCE_TYPE_REGION1, raddr); - r2t = (unsigned long *)(*r1e & _REGION_ENTRY_ORIGIN); + gmap_idte_one(__pa(r1o) | _ASCE_TYPE_REGION1, raddr); + r2t = *r1e & _REGION_ENTRY_ORIGIN; *r1e = _REGION1_ENTRY_EMPTY; - __gmap_unshadow_r2t(sg, raddr, r2t); + __gmap_unshadow_r2t(sg, raddr, __va(r2t)); /* Free region 2 table */ - page = pfn_to_page(__pa(r2t) >> PAGE_SHIFT); + page = phys_to_page(r2t); list_del(&page->lru); __free_pages(page, CRST_ALLOC_ORDER); } @@ -1535,22 +1539,23 @@ static void gmap_unshadow_r2t(struct gmap *sg, unsigned long raddr) static void __gmap_unshadow_r1t(struct gmap *sg, unsigned long raddr, unsigned long *r1t) { - unsigned long asce, *r2t; + unsigned long asce; struct page *page; + phys_addr_t r2t; int i; BUG_ON(!gmap_is_shadow(sg)); - asce = (unsigned long) r1t | _ASCE_TYPE_REGION1; + asce = __pa(r1t) | _ASCE_TYPE_REGION1; for (i = 0; i < _CRST_ENTRIES; i++, raddr += _REGION1_SIZE) { if (!(r1t[i] & _REGION_ENTRY_ORIGIN)) continue; - r2t = (unsigned long *)(r1t[i] & _REGION_ENTRY_ORIGIN); - __gmap_unshadow_r2t(sg, raddr, r2t); + r2t = r1t[i] & _REGION_ENTRY_ORIGIN; + __gmap_unshadow_r2t(sg, raddr, __va(r2t)); /* Clear entry and flush translation r1t -> r2t */ gmap_idte_one(asce, raddr); r1t[i] = _REGION1_ENTRY_EMPTY; /* Free region 2 table */ - page = pfn_to_page(__pa(r2t) >> PAGE_SHIFT); + page = phys_to_page(r2t); list_del(&page->lru); __free_pages(page, CRST_ALLOC_ORDER); } @@ -1572,7 +1577,7 @@ static void gmap_unshadow(struct gmap *sg) sg->removed = 1; gmap_call_notifier(sg, 0, -1UL); gmap_flush_tlb(sg); - table = (unsigned long *)(sg->asce & _ASCE_ORIGIN); + table = __va(sg->asce & _ASCE_ORIGIN); switch (sg->asce & _ASCE_TYPE_MASK) { case _ASCE_TYPE_REGION1: __gmap_unshadow_r1t(sg, 0, table); @@ -1747,7 +1752,8 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, int fake) { unsigned long raddr, origin, offset, len; - unsigned long *s_r2t, *table; + unsigned long *table; + phys_addr_t s_r2t; struct page *page; int rc; @@ -1759,7 +1765,7 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, page->index = r2t & _REGION_ENTRY_ORIGIN; if (fake) page->index |= GMAP_SHADOW_FAKE_TABLE; - s_r2t = (unsigned long *) page_to_phys(page); + s_r2t = page_to_phys(page); /* Install shadow region second table */ spin_lock(&sg->guest_table_lock); table = gmap_table_walk(sg, saddr, 4); /* get region-1 pointer */ @@ -1774,9 +1780,9 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, rc = -EAGAIN; /* Race with shadow */ goto out_free; } - crst_table_init(s_r2t, _REGION2_ENTRY_EMPTY); + crst_table_init(__va(s_r2t), _REGION2_ENTRY_EMPTY); /* mark as invalid as long as the parent table is not protected */ - *table = (unsigned long) s_r2t | _REGION_ENTRY_LENGTH | + *table = s_r2t | _REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID; if (sg->edat_level >= 1) *table |= (r2t & _REGION_ENTRY_PROTECT); @@ -1797,8 +1803,7 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t, spin_lock(&sg->guest_table_lock); if (!rc) { table = gmap_table_walk(sg, saddr, 4); - if (!table || (*table & _REGION_ENTRY_ORIGIN) != - (unsigned long) s_r2t) + if (!table || (*table & _REGION_ENTRY_ORIGIN) != s_r2t) rc = -EAGAIN; /* Race with unshadow */ else *table &= ~_REGION_ENTRY_INVALID; @@ -1831,7 +1836,8 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, int fake) { unsigned long raddr, origin, offset, len; - unsigned long *s_r3t, *table; + unsigned long *table; + phys_addr_t s_r3t; struct page *page; int rc; @@ -1843,7 +1849,7 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, page->index = r3t & _REGION_ENTRY_ORIGIN; if (fake) page->index |= GMAP_SHADOW_FAKE_TABLE; - s_r3t = (unsigned long *) page_to_phys(page); + s_r3t = page_to_phys(page); /* Install shadow region second table */ spin_lock(&sg->guest_table_lock); table = gmap_table_walk(sg, saddr, 3); /* get region-2 pointer */ @@ -1858,9 +1864,9 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, rc = -EAGAIN; /* Race with shadow */ goto out_free; } - crst_table_init(s_r3t, _REGION3_ENTRY_EMPTY); + crst_table_init(__va(s_r3t), _REGION3_ENTRY_EMPTY); /* mark as invalid as long as the parent table is not protected */ - *table = (unsigned long) s_r3t | _REGION_ENTRY_LENGTH | + *table = s_r3t | _REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID; if (sg->edat_level >= 1) *table |= (r3t & _REGION_ENTRY_PROTECT); @@ -1881,8 +1887,7 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t, spin_lock(&sg->guest_table_lock); if (!rc) { table = gmap_table_walk(sg, saddr, 3); - if (!table || (*table & _REGION_ENTRY_ORIGIN) != - (unsigned long) s_r3t) + if (!table || (*table & _REGION_ENTRY_ORIGIN) != s_r3t) rc = -EAGAIN; /* Race with unshadow */ else *table &= ~_REGION_ENTRY_INVALID; @@ -1915,7 +1920,8 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, int fake) { unsigned long raddr, origin, offset, len; - unsigned long *s_sgt, *table; + unsigned long *table; + phys_addr_t s_sgt; struct page *page; int rc; @@ -1927,7 +1933,7 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, page->index = sgt & _REGION_ENTRY_ORIGIN; if (fake) page->index |= GMAP_SHADOW_FAKE_TABLE; - s_sgt = (unsigned long *) page_to_phys(page); + s_sgt = page_to_phys(page); /* Install shadow region second table */ spin_lock(&sg->guest_table_lock); table = gmap_table_walk(sg, saddr, 2); /* get region-3 pointer */ @@ -1942,9 +1948,9 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, rc = -EAGAIN; /* Race with shadow */ goto out_free; } - crst_table_init(s_sgt, _SEGMENT_ENTRY_EMPTY); + crst_table_init(__va(s_sgt), _SEGMENT_ENTRY_EMPTY); /* mark as invalid as long as the parent table is not protected */ - *table = (unsigned long) s_sgt | _REGION_ENTRY_LENGTH | + *table = s_sgt | _REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID; if (sg->edat_level >= 1) *table |= sgt & _REGION_ENTRY_PROTECT; @@ -1965,8 +1971,7 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, spin_lock(&sg->guest_table_lock); if (!rc) { table = gmap_table_walk(sg, saddr, 2); - if (!table || (*table & _REGION_ENTRY_ORIGIN) != - (unsigned long) s_sgt) + if (!table || (*table & _REGION_ENTRY_ORIGIN) != s_sgt) rc = -EAGAIN; /* Race with unshadow */ else *table &= ~_REGION_ENTRY_INVALID; @@ -2039,8 +2044,9 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, int fake) { unsigned long raddr, origin; - unsigned long *s_pgt, *table; + unsigned long *table; struct page *page; + phys_addr_t s_pgt; int rc; BUG_ON(!gmap_is_shadow(sg) || (pgt & _SEGMENT_ENTRY_LARGE)); @@ -2051,7 +2057,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, page->index = pgt & _SEGMENT_ENTRY_ORIGIN; if (fake) page->index |= GMAP_SHADOW_FAKE_TABLE; - s_pgt = (unsigned long *) page_to_phys(page); + s_pgt = page_to_phys(page); /* Install shadow page table */ spin_lock(&sg->guest_table_lock); table = gmap_table_walk(sg, saddr, 1); /* get segment pointer */ @@ -2084,8 +2090,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, spin_lock(&sg->guest_table_lock); if (!rc) { table = gmap_table_walk(sg, saddr, 1); - if (!table || (*table & _SEGMENT_ENTRY_ORIGIN) != - (unsigned long) s_pgt) + if (!table || (*table & _SEGMENT_ENTRY_ORIGIN) != s_pgt) rc = -EAGAIN; /* Race with unshadow */ else *table &= ~_SEGMENT_ENTRY_INVALID; diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 1a25d456d865..30ab55f868f6 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -141,25 +141,25 @@ void mark_rodata_ro(void) debug_checkwx(); } -int set_memory_encrypted(unsigned long addr, int numpages) +int set_memory_encrypted(unsigned long vaddr, int numpages) { int i; /* make specified pages unshared, (swiotlb, dma_free) */ for (i = 0; i < numpages; ++i) { - uv_remove_shared(addr); - addr += PAGE_SIZE; + uv_remove_shared(virt_to_phys((void *)vaddr)); + vaddr += PAGE_SIZE; } return 0; } -int set_memory_decrypted(unsigned long addr, int numpages) +int set_memory_decrypted(unsigned long vaddr, int numpages) { int i; /* make specified pages shared (swiotlb, dma_alloca) */ for (i = 0; i < numpages; ++i) { - uv_set_shared(addr); - addr += PAGE_SIZE; + uv_set_shared(virt_to_phys((void *)vaddr)); + vaddr += PAGE_SIZE; } return 0; } diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c index 017baba56b01..1f21f576ca77 100644 --- a/arch/x86/events/intel/lbr.c +++ b/arch/x86/events/intel/lbr.c @@ -1603,10 +1603,8 @@ clear_arch_lbr: * x86_perf_get_lbr - get the LBR records information * * @lbr: the caller's memory to store the LBR records information - * - * Returns: 0 indicates the LBR info has been successfully obtained */ -int x86_perf_get_lbr(struct x86_pmu_lbr *lbr) +void x86_perf_get_lbr(struct x86_pmu_lbr *lbr) { int lbr_fmt = x86_pmu.intel_cap.lbr_format; @@ -1614,8 +1612,6 @@ int x86_perf_get_lbr(struct x86_pmu_lbr *lbr) lbr->from = x86_pmu.lbr_from; lbr->to = x86_pmu.lbr_to; lbr->info = (lbr_fmt == LBR_FORMAT_INFO) ? x86_pmu.lbr_info : 0; - - return 0; } EXPORT_SYMBOL_GPL(x86_perf_get_lbr); diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 2dd2691b5ee1..61012476d66e 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -311,6 +311,9 @@ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */ #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ +#define X86_FEATURE_CMPCCXADD (12*32+ 7) /* "" CMPccXADD instructions */ +#define X86_FEATURE_AMX_FP16 (12*32+21) /* "" AMX fp16 Support */ +#define X86_FEATURE_AVX_IFMA (12*32+23) /* "" Support for VPMADD52[H,L]UQ */ /* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 13 */ #define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */ diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 6d9368ea3701..08e822bd7aa6 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -61,6 +61,8 @@ #define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE BIT(10) /* Support for debug MSRs available */ #define HV_FEATURE_DEBUG_MSRS_AVAILABLE BIT(11) +/* Support for extended gva ranges for flush hypercalls available */ +#define HV_FEATURE_EXT_GVA_RANGES_FLUSH BIT(14) /* * Support for returning hypercall output block via XMM * registers is available @@ -607,6 +609,41 @@ struct hv_enlightened_vmcs { #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL 0xFFFF +/* + * Note, Hyper-V isn't actually stealing bit 28 from Intel, just abusing it by + * pairing it with architecturally impossible exit reasons. Bit 28 is set only + * on SMI exits to a SMI transfer monitor (STM) and if and only if a MTF VM-Exit + * is pending. I.e. it will never be set by hardware for non-SMI exits (there + * are only three), nor will it ever be set unless the VMM is an STM. + */ +#define HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH 0x10000031 + +/* + * Hyper-V uses the software reserved 32 bytes in VMCB control area to expose + * SVM enlightenments to guests. + */ +struct hv_vmcb_enlightenments { + struct __packed hv_enlightenments_control { + u32 nested_flush_hypercall:1; + u32 msr_bitmap:1; + u32 enlightened_npt_tlb: 1; + u32 reserved:29; + } __packed hv_enlightenments_control; + u32 hv_vp_id; + u64 hv_vm_id; + u64 partition_assist_page; + u64 reserved; +} __packed; + +/* + * Hyper-V uses the software reserved clean bit in VMCB. + */ +#define HV_VMCB_NESTED_ENLIGHTENMENTS 31 + +/* Synthetic VM-Exit */ +#define HV_SVM_EXITCODE_ENL 0xf0000000 +#define HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH (1) + struct hv_partition_assist_pg { u32 tlb_lock_count; }; diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h index 82ba4a564e58..abccd51dcfca 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -110,10 +110,12 @@ KVM_X86_OP_OPTIONAL_RET0(dy_apicv_has_pending_interrupt) KVM_X86_OP_OPTIONAL(set_hv_timer) KVM_X86_OP_OPTIONAL(cancel_hv_timer) KVM_X86_OP(setup_mce) +#ifdef CONFIG_KVM_SMM KVM_X86_OP(smi_allowed) KVM_X86_OP(enter_smm) KVM_X86_OP(leave_smm) KVM_X86_OP(enable_smi_window) +#endif KVM_X86_OP_OPTIONAL(mem_enc_ioctl) KVM_X86_OP_OPTIONAL(mem_enc_register_region) KVM_X86_OP_OPTIONAL(mem_enc_unregister_region) @@ -123,7 +125,7 @@ KVM_X86_OP_OPTIONAL(guest_memory_reclaimed) KVM_X86_OP(get_msr_feature) KVM_X86_OP(can_emulate_instruction) KVM_X86_OP(apic_init_signal_blocked) -KVM_X86_OP_OPTIONAL(enable_direct_tlbflush) +KVM_X86_OP_OPTIONAL(enable_l2_tlb_flush) KVM_X86_OP_OPTIONAL(migrate_timers) KVM_X86_OP(msr_filter_changed) KVM_X86_OP(complete_emulated_msr) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index f05ebaa26f0f..f35f1ff4427b 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -25,6 +25,7 @@ #include <linux/clocksource.h> #include <linux/irqbypass.h> #include <linux/hyperv.h> +#include <linux/kfifo.h> #include <asm/apic.h> #include <asm/pvclock-abi.h> @@ -81,7 +82,9 @@ #define KVM_REQ_NMI KVM_ARCH_REQ(9) #define KVM_REQ_PMU KVM_ARCH_REQ(10) #define KVM_REQ_PMI KVM_ARCH_REQ(11) +#ifdef CONFIG_KVM_SMM #define KVM_REQ_SMI KVM_ARCH_REQ(12) +#endif #define KVM_REQ_MASTERCLOCK_UPDATE KVM_ARCH_REQ(13) #define KVM_REQ_MCLOCK_INPROGRESS \ KVM_ARCH_REQ_FLAGS(14, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) @@ -108,6 +111,8 @@ KVM_ARCH_REQ_FLAGS(30, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) #define KVM_REQ_MMU_FREE_OBSOLETE_ROOTS \ KVM_ARCH_REQ_FLAGS(31, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_HV_TLB_FLUSH \ + KVM_ARCH_REQ_FLAGS(32, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) #define CR0_RESERVED_BITS \ (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \ @@ -204,6 +209,7 @@ typedef enum exit_fastpath_completion fastpath_t; struct x86_emulate_ctxt; struct x86_exception; +union kvm_smram; enum x86_intercept; enum x86_intercept_stage; @@ -253,16 +259,16 @@ enum x86_intercept_stage; #define PFERR_GUEST_PAGE_BIT 33 #define PFERR_IMPLICIT_ACCESS_BIT 48 -#define PFERR_PRESENT_MASK (1U << PFERR_PRESENT_BIT) -#define PFERR_WRITE_MASK (1U << PFERR_WRITE_BIT) -#define PFERR_USER_MASK (1U << PFERR_USER_BIT) -#define PFERR_RSVD_MASK (1U << PFERR_RSVD_BIT) -#define PFERR_FETCH_MASK (1U << PFERR_FETCH_BIT) -#define PFERR_PK_MASK (1U << PFERR_PK_BIT) -#define PFERR_SGX_MASK (1U << PFERR_SGX_BIT) -#define PFERR_GUEST_FINAL_MASK (1ULL << PFERR_GUEST_FINAL_BIT) -#define PFERR_GUEST_PAGE_MASK (1ULL << PFERR_GUEST_PAGE_BIT) -#define PFERR_IMPLICIT_ACCESS (1ULL << PFERR_IMPLICIT_ACCESS_BIT) +#define PFERR_PRESENT_MASK BIT(PFERR_PRESENT_BIT) +#define PFERR_WRITE_MASK BIT(PFERR_WRITE_BIT) +#define PFERR_USER_MASK BIT(PFERR_USER_BIT) +#define PFERR_RSVD_MASK BIT(PFERR_RSVD_BIT) +#define PFERR_FETCH_MASK BIT(PFERR_FETCH_BIT) +#define PFERR_PK_MASK BIT(PFERR_PK_BIT) +#define PFERR_SGX_MASK BIT(PFERR_SGX_BIT) +#define PFERR_GUEST_FINAL_MASK BIT_ULL(PFERR_GUEST_FINAL_BIT) +#define PFERR_GUEST_PAGE_MASK BIT_ULL(PFERR_GUEST_PAGE_BIT) +#define PFERR_IMPLICIT_ACCESS BIT_ULL(PFERR_IMPLICIT_ACCESS_BIT) #define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK | \ PFERR_WRITE_MASK | \ @@ -488,17 +494,19 @@ enum pmc_type { struct kvm_pmc { enum pmc_type type; u8 idx; + bool is_paused; + bool intr; u64 counter; + u64 prev_counter; u64 eventsel; struct perf_event *perf_event; struct kvm_vcpu *vcpu; /* + * only for creating or reusing perf_event, * eventsel value for general purpose counters, * ctrl value for fixed counters. */ u64 current_config; - bool is_paused; - bool intr; }; /* More counters may conflict with other existing Architectural MSRs */ @@ -524,7 +532,16 @@ struct kvm_pmu { struct kvm_pmc gp_counters[KVM_INTEL_PMC_MAX_GENERIC]; struct kvm_pmc fixed_counters[KVM_PMC_MAX_FIXED]; struct irq_work irq_work; - DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX); + + /* + * Overlay the bitmap with a 64-bit atomic so that all bits can be + * set in a single access, e.g. to reprogram all counters when the PMU + * filter changes. + */ + union { + DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX); + atomic64_t __reprogram_pmi; + }; DECLARE_BITMAP(all_valid_pmc_idx, X86_PMC_IDX_MAX); DECLARE_BITMAP(pmc_in_use, X86_PMC_IDX_MAX); @@ -602,6 +619,29 @@ struct kvm_vcpu_hv_synic { bool dont_zero_synic_pages; }; +/* The maximum number of entries on the TLB flush fifo. */ +#define KVM_HV_TLB_FLUSH_FIFO_SIZE (16) +/* + * Note: the following 'magic' entry is made up by KVM to avoid putting + * anything besides GVA on the TLB flush fifo. It is theoretically possible + * to observe a request to flush 4095 PFNs starting from 0xfffffffffffff000 + * which will look identical. KVM's action to 'flush everything' instead of + * flushing these particular addresses is, however, fully legitimate as + * flushing more than requested is always OK. + */ +#define KVM_HV_TLB_FLUSHALL_ENTRY ((u64)-1) + +enum hv_tlb_flush_fifos { + HV_L1_TLB_FLUSH_FIFO, + HV_L2_TLB_FLUSH_FIFO, + HV_NR_TLB_FLUSH_FIFOS, +}; + +struct kvm_vcpu_hv_tlb_flush_fifo { + spinlock_t write_lock; + DECLARE_KFIFO(entries, u64, KVM_HV_TLB_FLUSH_FIFO_SIZE); +}; + /* Hyper-V per vcpu emulation context */ struct kvm_vcpu_hv { struct kvm_vcpu *vcpu; @@ -623,6 +663,19 @@ struct kvm_vcpu_hv { u32 nested_eax; /* HYPERV_CPUID_NESTED_FEATURES.EAX */ u32 nested_ebx; /* HYPERV_CPUID_NESTED_FEATURES.EBX */ } cpuid_cache; + + struct kvm_vcpu_hv_tlb_flush_fifo tlb_flush_fifo[HV_NR_TLB_FLUSH_FIFOS]; + + /* Preallocated buffer for handling hypercalls passing sparse vCPU set */ + u64 sparse_banks[HV_MAX_SPARSE_VCPU_BANKS]; + + struct hv_vp_assist_page vp_assist_page; + + struct { + u64 pa_page_gpa; + u64 vm_id; + u32 vp_id; + } nested; }; /* Xen HVM per vcpu emulation context */ @@ -633,6 +686,7 @@ struct kvm_vcpu_xen { struct gfn_to_pfn_cache vcpu_info_cache; struct gfn_to_pfn_cache vcpu_time_info_cache; struct gfn_to_pfn_cache runstate_cache; + struct gfn_to_pfn_cache runstate2_cache; u64 last_steal; u64 runstate_entry_time; u64 runstate_times[4]; @@ -1059,6 +1113,7 @@ struct msr_bitmap_range { struct kvm_xen { u32 xen_version; bool long_mode; + bool runstate_update_flag; u8 upcall_vector; struct gfn_to_pfn_cache shinfo_cache; struct idr evtchn_ports; @@ -1156,7 +1211,18 @@ struct kvm_arch { struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES]; struct list_head active_mmu_pages; struct list_head zapped_obsolete_pages; - struct list_head lpage_disallowed_mmu_pages; + /* + * A list of kvm_mmu_page structs that, if zapped, could possibly be + * replaced by an NX huge page. A shadow page is on this list if its + * existence disallows an NX huge page (nx_huge_page_disallowed is set) + * and there are no other conditions that prevent a huge page, e.g. + * the backing host page is huge, dirtly logging is not enabled for its + * memslot, etc... Note, zapping shadow pages on this list doesn't + * guarantee an NX huge page will be created in its stead, e.g. if the + * guest attempts to execute from the region then KVM obviously can't + * create an NX huge page (without hanging the guest). + */ + struct list_head possible_nx_huge_pages; struct kvm_page_track_notifier_node mmu_sp_tracker; struct kvm_page_track_notifier_head track_notifier_head; /* @@ -1272,7 +1338,7 @@ struct kvm_arch { bool sgx_provisioning_allowed; struct kvm_pmu_event_filter __rcu *pmu_event_filter; - struct task_struct *nx_lpage_recovery_thread; + struct task_struct *nx_huge_page_recovery_thread; #ifdef CONFIG_X86_64 /* @@ -1284,6 +1350,9 @@ struct kvm_arch { */ bool tdp_mmu_enabled; + /* The number of TDP MMU pages across all roots. */ + atomic64_t tdp_mmu_pages; + /* * List of kvm_mmu_page structs being used as roots. * All kvm_mmu_page structs in the list should have @@ -1305,20 +1374,12 @@ struct kvm_arch { struct list_head tdp_mmu_roots; /* - * List of kvm_mmu_page structs not being used as roots. - * All kvm_mmu_page structs in the list should have - * tdp_mmu_page set and a tdp_mmu_root_count of 0. - */ - struct list_head tdp_mmu_pages; - - /* * Protects accesses to the following fields when the MMU lock * is held in read mode: * - tdp_mmu_roots (above) - * - tdp_mmu_pages (above) * - the link field of kvm_mmu_page structs used by the TDP MMU - * - lpage_disallowed_mmu_pages - * - the lpage_disallowed_link field of kvm_mmu_page structs used + * - possible_nx_huge_pages; + * - the possible_nx_huge_page_link field of kvm_mmu_page structs used * by the TDP MMU * It is acceptable, but not necessary, to acquire this lock when * the thread holds the MMU lock in write mode. @@ -1612,10 +1673,12 @@ struct kvm_x86_ops { void (*setup_mce)(struct kvm_vcpu *vcpu); +#ifdef CONFIG_KVM_SMM int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection); - int (*enter_smm)(struct kvm_vcpu *vcpu, char *smstate); - int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate); + int (*enter_smm)(struct kvm_vcpu *vcpu, union kvm_smram *smram); + int (*leave_smm)(struct kvm_vcpu *vcpu, const union kvm_smram *smram); void (*enable_smi_window)(struct kvm_vcpu *vcpu); +#endif int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp); int (*mem_enc_register_region)(struct kvm *kvm, struct kvm_enc_region *argp); @@ -1630,7 +1693,7 @@ struct kvm_x86_ops { void *insn, int insn_len); bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu); - int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu); + int (*enable_l2_tlb_flush)(struct kvm_vcpu *vcpu); void (*migrate_timers)(struct kvm_vcpu *vcpu); void (*msr_filter_changed)(struct kvm_vcpu *vcpu); @@ -1663,6 +1726,7 @@ struct kvm_x86_nested_ops { int (*enable_evmcs)(struct kvm_vcpu *vcpu, uint16_t *vmcs_version); uint16_t (*get_evmcs_version)(struct kvm_vcpu *vcpu); + void (*hv_inject_synthetic_vmexit_post_tlb_flush)(struct kvm_vcpu *vcpu); }; struct kvm_x86_init_ops { @@ -1844,6 +1908,7 @@ int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu); int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu); void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg); +void kvm_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg); int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg); void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector); @@ -1909,8 +1974,6 @@ void kvm_mmu_free_roots(struct kvm *kvm, struct kvm_mmu *mmu, void kvm_mmu_free_guest_mode_roots(struct kvm *kvm, struct kvm_mmu *mmu); gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, struct x86_exception *exception); -gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, - struct x86_exception *exception); gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, struct x86_exception *exception); gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, @@ -1994,14 +2057,18 @@ enum { #define HF_NMI_MASK (1 << 3) #define HF_IRET_MASK (1 << 4) #define HF_GUEST_MASK (1 << 5) /* VCPU is in guest-mode */ + +#ifdef CONFIG_KVM_SMM #define HF_SMM_MASK (1 << 6) #define HF_SMM_INSIDE_NMI_MASK (1 << 7) -#define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE -#define KVM_ADDRESS_SPACE_NUM 2 - -#define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0) -#define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm) +# define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE +# define KVM_ADDRESS_SPACE_NUM 2 +# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0) +# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm) +#else +# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0) +#endif #define KVM_ARCH_WANT_MMU_NOTIFIER @@ -2089,14 +2156,6 @@ static inline int kvm_cpu_get_apicid(int mps_cpu) #endif } -#define put_smstate(type, buf, offset, val) \ - *(type *)((buf) + (offset) - 0x7e00) = val - -#define GET_SMSTATE(type, buf, offset) \ - (*(type *)((buf) + (offset) - 0x7e00)) - -int kvm_cpu_dirty_log_size(void); - int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages); #define KVM_CLOCK_VALID_FLAGS \ diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 9ac46dbe57d4..5d0f6891ae61 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -543,12 +543,12 @@ static inline void perf_check_microcode(void) { } #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr, void *data); -extern int x86_perf_get_lbr(struct x86_pmu_lbr *lbr); +extern void x86_perf_get_lbr(struct x86_pmu_lbr *lbr); #else struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr, void *data); -static inline int x86_perf_get_lbr(struct x86_pmu_lbr *lbr) +static inline void x86_perf_get_lbr(struct x86_pmu_lbr *lbr) { - return -1; + memset(lbr, 0, sizeof(*lbr)); } #endif diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index 0361626841bc..cb1ee53ad3b1 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -5,6 +5,8 @@ #include <uapi/asm/svm.h> #include <uapi/asm/kvm.h> +#include <asm/hyperv-tlfs.h> + /* * 32-bit intercept words in the VMCB Control Area, starting * at Byte offset 000h. @@ -161,7 +163,10 @@ struct __attribute__ ((__packed__)) vmcb_control_area { * Offset 0x3e0, 32 bytes reserved * for use by hypervisor/software. */ - u8 reserved_sw[32]; + union { + struct hv_vmcb_enlightenments hv_enlightenments; + u8 reserved_sw[32]; + }; }; @@ -293,12 +298,13 @@ struct vmcb_save_area { struct vmcb_seg ldtr; struct vmcb_seg idtr; struct vmcb_seg tr; - u8 reserved_1[42]; + /* Reserved fields are named following their struct offset */ + u8 reserved_0xa0[42]; u8 vmpl; u8 cpl; - u8 reserved_2[4]; + u8 reserved_0xcc[4]; u64 efer; - u8 reserved_3[112]; + u8 reserved_0xd8[112]; u64 cr4; u64 cr3; u64 cr0; @@ -306,7 +312,7 @@ struct vmcb_save_area { u64 dr6; u64 rflags; u64 rip; - u8 reserved_4[88]; + u8 reserved_0x180[88]; u64 rsp; u64 s_cet; u64 ssp; @@ -321,14 +327,14 @@ struct vmcb_save_area { u64 sysenter_esp; u64 sysenter_eip; u64 cr2; - u8 reserved_5[32]; + u8 reserved_0x248[32]; u64 g_pat; u64 dbgctl; u64 br_from; u64 br_to; u64 last_excp_from; u64 last_excp_to; - u8 reserved_6[72]; + u8 reserved_0x298[72]; u32 spec_ctrl; /* Guest version of SPEC_CTRL at 0x2E0 */ } __packed; @@ -349,12 +355,12 @@ struct sev_es_save_area { u64 vmpl2_ssp; u64 vmpl3_ssp; u64 u_cet; - u8 reserved_1[2]; + u8 reserved_0xc8[2]; u8 vmpl; u8 cpl; - u8 reserved_2[4]; + u8 reserved_0xcc[4]; u64 efer; - u8 reserved_3[104]; + u8 reserved_0xd8[104]; u64 xss; u64 cr4; u64 cr3; @@ -371,7 +377,7 @@ struct sev_es_save_area { u64 dr1_addr_mask; u64 dr2_addr_mask; u64 dr3_addr_mask; - u8 reserved_4[24]; + u8 reserved_0x1c0[24]; u64 rsp; u64 s_cet; u64 ssp; @@ -386,21 +392,21 @@ struct sev_es_save_area { u64 sysenter_esp; u64 sysenter_eip; u64 cr2; - u8 reserved_5[32]; + u8 reserved_0x248[32]; u64 g_pat; u64 dbgctl; u64 br_from; u64 br_to; u64 last_excp_from; u64 last_excp_to; - u8 reserved_7[80]; + u8 reserved_0x298[80]; u32 pkru; - u8 reserved_8[20]; - u64 reserved_9; /* rax already available at 0x01f8 */ + u32 tsc_aux; + u8 reserved_0x2f0[24]; u64 rcx; u64 rdx; u64 rbx; - u64 reserved_10; /* rsp already available at 0x01d8 */ + u64 reserved_0x320; /* rsp already available at 0x01d8 */ u64 rbp; u64 rsi; u64 rdi; @@ -412,7 +418,7 @@ struct sev_es_save_area { u64 r13; u64 r14; u64 r15; - u8 reserved_11[16]; + u8 reserved_0x380[16]; u64 guest_exit_info_1; u64 guest_exit_info_2; u64 guest_exit_int_info; @@ -425,7 +431,7 @@ struct sev_es_save_area { u64 pcpu_id; u64 event_inj; u64 xcr0; - u8 reserved_12[16]; + u8 reserved_0x3f0[16]; /* Floating point area */ u64 x87_dp; @@ -443,23 +449,23 @@ struct sev_es_save_area { } __packed; struct ghcb_save_area { - u8 reserved_1[203]; + u8 reserved_0x0[203]; u8 cpl; - u8 reserved_2[116]; + u8 reserved_0xcc[116]; u64 xss; - u8 reserved_3[24]; + u8 reserved_0x148[24]; u64 dr7; - u8 reserved_4[16]; + u8 reserved_0x168[16]; u64 rip; - u8 reserved_5[88]; + u8 reserved_0x180[88]; u64 rsp; - u8 reserved_6[24]; + u8 reserved_0x1e0[24]; u64 rax; - u8 reserved_7[264]; + u8 reserved_0x200[264]; u64 rcx; u64 rdx; u64 rbx; - u8 reserved_8[8]; + u8 reserved_0x320[8]; u64 rbp; u64 rsi; u64 rdi; @@ -471,12 +477,12 @@ struct ghcb_save_area { u64 r13; u64 r14; u64 r15; - u8 reserved_9[16]; + u8 reserved_0x380[16]; u64 sw_exit_code; u64 sw_exit_info_1; u64 sw_exit_info_2; u64 sw_scratch; - u8 reserved_10[56]; + u8 reserved_0x3b0[56]; u64 xcr0; u8 valid_bitmap[16]; u64 x87_state_gpa; @@ -490,7 +496,7 @@ struct ghcb { u8 shared_buffer[GHCB_SHARED_BUF_SIZE]; - u8 reserved_1[10]; + u8 reserved_0xff0[10]; u16 protocol_version; /* negotiated SEV-ES/GHCB protocol version */ u32 ghcb_usage; } __packed; @@ -502,6 +508,9 @@ struct ghcb { #define EXPECTED_VMCB_CONTROL_AREA_SIZE 1024 #define EXPECTED_GHCB_SIZE PAGE_SIZE +#define BUILD_BUG_RESERVED_OFFSET(x, y) \ + ASSERT_STRUCT_OFFSET(struct x, reserved ## _ ## y, y) + static inline void __unused_size_checks(void) { BUILD_BUG_ON(sizeof(struct vmcb_save_area) != EXPECTED_VMCB_SAVE_AREA_SIZE); @@ -509,6 +518,39 @@ static inline void __unused_size_checks(void) BUILD_BUG_ON(sizeof(struct sev_es_save_area) != EXPECTED_SEV_ES_SAVE_AREA_SIZE); BUILD_BUG_ON(sizeof(struct vmcb_control_area) != EXPECTED_VMCB_CONTROL_AREA_SIZE); BUILD_BUG_ON(sizeof(struct ghcb) != EXPECTED_GHCB_SIZE); + + /* Check offsets of reserved fields */ + + BUILD_BUG_RESERVED_OFFSET(vmcb_save_area, 0xa0); + BUILD_BUG_RESERVED_OFFSET(vmcb_save_area, 0xcc); + BUILD_BUG_RESERVED_OFFSET(vmcb_save_area, 0xd8); + BUILD_BUG_RESERVED_OFFSET(vmcb_save_area, 0x180); + BUILD_BUG_RESERVED_OFFSET(vmcb_save_area, 0x248); + BUILD_BUG_RESERVED_OFFSET(vmcb_save_area, 0x298); + + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0xc8); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0xcc); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0xd8); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x1c0); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x248); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x298); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x2f0); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x320); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x380); + BUILD_BUG_RESERVED_OFFSET(sev_es_save_area, 0x3f0); + + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x0); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0xcc); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x148); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x168); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x180); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x1e0); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x200); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x320); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x380); + BUILD_BUG_RESERVED_OFFSET(ghcb_save_area, 0x3b0); + + BUILD_BUG_RESERVED_OFFSET(ghcb, 0xff0); } struct vmcb { diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h index 46de10a809ec..e48deab8901d 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -53,14 +53,6 @@ /* Architectural interrupt line count. */ #define KVM_NR_INTERRUPTS 256 -struct kvm_memory_alias { - __u32 slot; /* this has a different namespace than memory slots */ - __u32 flags; - __u64 guest_phys_addr; - __u64 memory_size; - __u64 target_phys_addr; -}; - /* for KVM_GET_IRQCHIP and KVM_SET_IRQCHIP */ struct kvm_pic_state { __u8 last_irr; /* edge detection */ @@ -214,6 +206,8 @@ struct kvm_msr_list { struct kvm_msr_filter_range { #define KVM_MSR_FILTER_READ (1 << 0) #define KVM_MSR_FILTER_WRITE (1 << 1) +#define KVM_MSR_FILTER_RANGE_VALID_MASK (KVM_MSR_FILTER_READ | \ + KVM_MSR_FILTER_WRITE) __u32 flags; __u32 nmsrs; /* number of msrs in bitmap */ __u32 base; /* MSR index the bitmap starts at */ @@ -222,8 +216,11 @@ struct kvm_msr_filter_range { #define KVM_MSR_FILTER_MAX_RANGES 16 struct kvm_msr_filter { +#ifndef __KERNEL__ #define KVM_MSR_FILTER_DEFAULT_ALLOW (0 << 0) +#endif #define KVM_MSR_FILTER_DEFAULT_DENY (1 << 0) +#define KVM_MSR_FILTER_VALID_MASK (KVM_MSR_FILTER_DEFAULT_DENY) __u32 flags; struct kvm_msr_filter_range ranges[KVM_MSR_FILTER_MAX_RANGES]; }; diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 4d053cb2c48a..1cceac5984da 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -349,7 +349,7 @@ static notrace void kvm_guest_apic_eoi_write(u32 reg, u32 val) static void kvm_guest_cpu_init(void) { if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF_INT) && kvmapf) { - u64 pa = slow_virt_to_phys(this_cpu_ptr(&apf_reason)); + u64 pa; WARN_ON_ONCE(!static_branch_likely(&kvm_async_pf_enabled)); diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 67be7f217e37..fbeaa9ddef59 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -118,6 +118,17 @@ config KVM_AMD_SEV Provides support for launching Encrypted VMs (SEV) and Encrypted VMs with Encrypted State (SEV-ES) on AMD processors. +config KVM_SMM + bool "System Management Mode emulation" + default y + depends on KVM + help + Provides support for KVM to emulate System Management Mode (SMM) + in virtual machines. This can be used by the virtual machine + firmware to implement UEFI secure boot. + + If unsure, say Y. + config KVM_XEN bool "Support for Xen hypercall interface" depends on KVM diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index f453a0f96e24..80e3fe184d17 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -20,12 +20,14 @@ endif kvm-$(CONFIG_X86_64) += mmu/tdp_iter.o mmu/tdp_mmu.o kvm-$(CONFIG_KVM_XEN) += xen.o +kvm-$(CONFIG_KVM_SMM) += smm.o kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \ - vmx/evmcs.o vmx/nested.o vmx/posted_intr.o + vmx/hyperv.o vmx/nested.o vmx/posted_intr.o kvm-intel-$(CONFIG_X86_SGX_KVM) += vmx/sgx.o -kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o svm/sev.o +kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o \ + svm/sev.o svm/hyperv.o ifdef CONFIG_HYPERV kvm-amd-y += svm/svm_onhyperv.o diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index c92c49a0b35b..b14653b61470 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -62,10 +62,16 @@ u32 xstate_required_size(u64 xstate_bv, bool compacted) * This one is tied to SSB in the user API, and not * visible in /proc/cpuinfo. */ -#define KVM_X86_FEATURE_PSFD (13*32+28) /* Predictive Store Forwarding Disable */ +#define KVM_X86_FEATURE_AMD_PSFD (13*32+28) /* Predictive Store Forwarding Disable */ #define F feature_bit -#define SF(name) (boot_cpu_has(X86_FEATURE_##name) ? F(name) : 0) + +/* Scattered Flag - For features that are scattered by cpufeatures.h. */ +#define SF(name) \ +({ \ + BUILD_BUG_ON(X86_FEATURE_##name >= MAX_CPU_FEATURES); \ + (boot_cpu_has(X86_FEATURE_##name) ? F(name) : 0); \ +}) /* * Magic value used by KVM when querying userspace-provided CPUID entries and @@ -543,9 +549,9 @@ static __always_inline void __kvm_cpu_cap_mask(unsigned int leaf) } static __always_inline -void kvm_cpu_cap_init_scattered(enum kvm_only_cpuid_leafs leaf, u32 mask) +void kvm_cpu_cap_init_kvm_defined(enum kvm_only_cpuid_leafs leaf, u32 mask) { - /* Use kvm_cpu_cap_mask for non-scattered leafs. */ + /* Use kvm_cpu_cap_mask for leafs that aren't KVM-only. */ BUILD_BUG_ON(leaf < NCAPINTS); kvm_cpu_caps[leaf] = mask; @@ -555,7 +561,7 @@ void kvm_cpu_cap_init_scattered(enum kvm_only_cpuid_leafs leaf, u32 mask) static __always_inline void kvm_cpu_cap_mask(enum cpuid_leafs leaf, u32 mask) { - /* Use kvm_cpu_cap_init_scattered for scattered leafs. */ + /* Use kvm_cpu_cap_init_kvm_defined for KVM-only leafs. */ BUILD_BUG_ON(leaf >= NCAPINTS); kvm_cpu_caps[leaf] &= mask; @@ -657,14 +663,19 @@ void kvm_set_cpu_caps(void) kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD); kvm_cpu_cap_mask(CPUID_7_1_EAX, - F(AVX_VNNI) | F(AVX512_BF16) + F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) | + F(AVX_IFMA) + ); + + kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX, + F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) | F(PREFETCHITI) ); kvm_cpu_cap_mask(CPUID_D_1_EAX, F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) | f_xfd ); - kvm_cpu_cap_init_scattered(CPUID_12_EAX, + kvm_cpu_cap_init_kvm_defined(CPUID_12_EAX, SF(SGX1) | SF(SGX2) | SF(SGX_EDECCSSA) ); @@ -694,7 +705,7 @@ void kvm_set_cpu_caps(void) F(CLZERO) | F(XSAVEERPTR) | F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) | F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) | - __feature_bit(KVM_X86_FEATURE_PSFD) + __feature_bit(KVM_X86_FEATURE_AMD_PSFD) ); /* @@ -913,9 +924,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) goto out; cpuid_entry_override(entry, CPUID_7_1_EAX); + cpuid_entry_override(entry, CPUID_7_1_EDX); entry->ebx = 0; entry->ecx = 0; - entry->edx = 0; } break; case 0xa: { /* Architectural Performance Monitoring */ @@ -1220,8 +1231,12 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) * Other defined bits are for MSRs that KVM does not expose: * EAX 3 SPCL, SMM page configuration lock * EAX 13 PCMSR, Prefetch control MSR + * + * KVM doesn't support SMM_CTL. + * EAX 9 SMM_CTL MSR is not supported */ entry->eax &= BIT(0) | BIT(2) | BIT(6); + entry->eax |= BIT(9); if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC)) entry->eax |= BIT(2); if (!static_cpu_has_bug(X86_BUG_NULL_SEG)) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 4a43261d25a2..5cc3efa0e21c 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -242,37 +242,6 @@ enum x86_transfer_type { X86_TRANSFER_TASK_SWITCH, }; -static ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) -{ - if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt)) - nr &= NR_EMULATOR_GPRS - 1; - - if (!(ctxt->regs_valid & (1 << nr))) { - ctxt->regs_valid |= 1 << nr; - ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr); - } - return ctxt->_regs[nr]; -} - -static ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr) -{ - if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt)) - nr &= NR_EMULATOR_GPRS - 1; - - BUILD_BUG_ON(sizeof(ctxt->regs_dirty) * BITS_PER_BYTE < NR_EMULATOR_GPRS); - BUILD_BUG_ON(sizeof(ctxt->regs_valid) * BITS_PER_BYTE < NR_EMULATOR_GPRS); - - ctxt->regs_valid |= 1 << nr; - ctxt->regs_dirty |= 1 << nr; - return &ctxt->_regs[nr]; -} - -static ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr) -{ - reg_read(ctxt, nr); - return reg_write(ctxt, nr); -} - static void writeback_registers(struct x86_emulate_ctxt *ctxt) { unsigned long dirty = ctxt->regs_dirty; @@ -2338,335 +2307,15 @@ static int em_lseg(struct x86_emulate_ctxt *ctxt) return rc; } -static int emulator_has_longmode(struct x86_emulate_ctxt *ctxt) -{ -#ifdef CONFIG_X86_64 - return ctxt->ops->guest_has_long_mode(ctxt); -#else - return false; -#endif -} - -static void rsm_set_desc_flags(struct desc_struct *desc, u32 flags) -{ - desc->g = (flags >> 23) & 1; - desc->d = (flags >> 22) & 1; - desc->l = (flags >> 21) & 1; - desc->avl = (flags >> 20) & 1; - desc->p = (flags >> 15) & 1; - desc->dpl = (flags >> 13) & 3; - desc->s = (flags >> 12) & 1; - desc->type = (flags >> 8) & 15; -} - -static int rsm_load_seg_32(struct x86_emulate_ctxt *ctxt, const char *smstate, - int n) -{ - struct desc_struct desc; - int offset; - u16 selector; - - selector = GET_SMSTATE(u32, smstate, 0x7fa8 + n * 4); - - if (n < 3) - offset = 0x7f84 + n * 12; - else - offset = 0x7f2c + (n - 3) * 12; - - set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8)); - set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4)); - rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, offset)); - ctxt->ops->set_segment(ctxt, selector, &desc, 0, n); - return X86EMUL_CONTINUE; -} - -#ifdef CONFIG_X86_64 -static int rsm_load_seg_64(struct x86_emulate_ctxt *ctxt, const char *smstate, - int n) -{ - struct desc_struct desc; - int offset; - u16 selector; - u32 base3; - - offset = 0x7e00 + n * 16; - - selector = GET_SMSTATE(u16, smstate, offset); - rsm_set_desc_flags(&desc, GET_SMSTATE(u16, smstate, offset + 2) << 8); - set_desc_limit(&desc, GET_SMSTATE(u32, smstate, offset + 4)); - set_desc_base(&desc, GET_SMSTATE(u32, smstate, offset + 8)); - base3 = GET_SMSTATE(u32, smstate, offset + 12); - - ctxt->ops->set_segment(ctxt, selector, &desc, base3, n); - return X86EMUL_CONTINUE; -} -#endif - -static int rsm_enter_protected_mode(struct x86_emulate_ctxt *ctxt, - u64 cr0, u64 cr3, u64 cr4) -{ - int bad; - u64 pcid; - - /* In order to later set CR4.PCIDE, CR3[11:0] must be zero. */ - pcid = 0; - if (cr4 & X86_CR4_PCIDE) { - pcid = cr3 & 0xfff; - cr3 &= ~0xfff; - } - - bad = ctxt->ops->set_cr(ctxt, 3, cr3); - if (bad) - return X86EMUL_UNHANDLEABLE; - - /* - * First enable PAE, long mode needs it before CR0.PG = 1 is set. - * Then enable protected mode. However, PCID cannot be enabled - * if EFER.LMA=0, so set it separately. - */ - bad = ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE); - if (bad) - return X86EMUL_UNHANDLEABLE; - - bad = ctxt->ops->set_cr(ctxt, 0, cr0); - if (bad) - return X86EMUL_UNHANDLEABLE; - - if (cr4 & X86_CR4_PCIDE) { - bad = ctxt->ops->set_cr(ctxt, 4, cr4); - if (bad) - return X86EMUL_UNHANDLEABLE; - if (pcid) { - bad = ctxt->ops->set_cr(ctxt, 3, cr3 | pcid); - if (bad) - return X86EMUL_UNHANDLEABLE; - } - - } - - return X86EMUL_CONTINUE; -} - -static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt, - const char *smstate) -{ - struct desc_struct desc; - struct desc_ptr dt; - u16 selector; - u32 val, cr0, cr3, cr4; - int i; - - cr0 = GET_SMSTATE(u32, smstate, 0x7ffc); - cr3 = GET_SMSTATE(u32, smstate, 0x7ff8); - ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7ff4) | X86_EFLAGS_FIXED; - ctxt->_eip = GET_SMSTATE(u32, smstate, 0x7ff0); - - for (i = 0; i < 8; i++) - *reg_write(ctxt, i) = GET_SMSTATE(u32, smstate, 0x7fd0 + i * 4); - - val = GET_SMSTATE(u32, smstate, 0x7fcc); - - if (ctxt->ops->set_dr(ctxt, 6, val)) - return X86EMUL_UNHANDLEABLE; - - val = GET_SMSTATE(u32, smstate, 0x7fc8); - - if (ctxt->ops->set_dr(ctxt, 7, val)) - return X86EMUL_UNHANDLEABLE; - - selector = GET_SMSTATE(u32, smstate, 0x7fc4); - set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f64)); - set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f60)); - rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f5c)); - ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_TR); - - selector = GET_SMSTATE(u32, smstate, 0x7fc0); - set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7f80)); - set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7f7c)); - rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7f78)); - ctxt->ops->set_segment(ctxt, selector, &desc, 0, VCPU_SREG_LDTR); - - dt.address = GET_SMSTATE(u32, smstate, 0x7f74); - dt.size = GET_SMSTATE(u32, smstate, 0x7f70); - ctxt->ops->set_gdt(ctxt, &dt); - - dt.address = GET_SMSTATE(u32, smstate, 0x7f58); - dt.size = GET_SMSTATE(u32, smstate, 0x7f54); - ctxt->ops->set_idt(ctxt, &dt); - - for (i = 0; i < 6; i++) { - int r = rsm_load_seg_32(ctxt, smstate, i); - if (r != X86EMUL_CONTINUE) - return r; - } - - cr4 = GET_SMSTATE(u32, smstate, 0x7f14); - - ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7ef8)); - - return rsm_enter_protected_mode(ctxt, cr0, cr3, cr4); -} - -#ifdef CONFIG_X86_64 -static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt, - const char *smstate) -{ - struct desc_struct desc; - struct desc_ptr dt; - u64 val, cr0, cr3, cr4; - u32 base3; - u16 selector; - int i, r; - - for (i = 0; i < 16; i++) - *reg_write(ctxt, i) = GET_SMSTATE(u64, smstate, 0x7ff8 - i * 8); - - ctxt->_eip = GET_SMSTATE(u64, smstate, 0x7f78); - ctxt->eflags = GET_SMSTATE(u32, smstate, 0x7f70) | X86_EFLAGS_FIXED; - - val = GET_SMSTATE(u64, smstate, 0x7f68); - - if (ctxt->ops->set_dr(ctxt, 6, val)) - return X86EMUL_UNHANDLEABLE; - - val = GET_SMSTATE(u64, smstate, 0x7f60); - - if (ctxt->ops->set_dr(ctxt, 7, val)) - return X86EMUL_UNHANDLEABLE; - - cr0 = GET_SMSTATE(u64, smstate, 0x7f58); - cr3 = GET_SMSTATE(u64, smstate, 0x7f50); - cr4 = GET_SMSTATE(u64, smstate, 0x7f48); - ctxt->ops->set_smbase(ctxt, GET_SMSTATE(u32, smstate, 0x7f00)); - val = GET_SMSTATE(u64, smstate, 0x7ed0); - - if (ctxt->ops->set_msr(ctxt, MSR_EFER, val & ~EFER_LMA)) - return X86EMUL_UNHANDLEABLE; - - selector = GET_SMSTATE(u32, smstate, 0x7e90); - rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e92) << 8); - set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e94)); - set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e98)); - base3 = GET_SMSTATE(u32, smstate, 0x7e9c); - ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_TR); - - dt.size = GET_SMSTATE(u32, smstate, 0x7e84); - dt.address = GET_SMSTATE(u64, smstate, 0x7e88); - ctxt->ops->set_idt(ctxt, &dt); - - selector = GET_SMSTATE(u32, smstate, 0x7e70); - rsm_set_desc_flags(&desc, GET_SMSTATE(u32, smstate, 0x7e72) << 8); - set_desc_limit(&desc, GET_SMSTATE(u32, smstate, 0x7e74)); - set_desc_base(&desc, GET_SMSTATE(u32, smstate, 0x7e78)); - base3 = GET_SMSTATE(u32, smstate, 0x7e7c); - ctxt->ops->set_segment(ctxt, selector, &desc, base3, VCPU_SREG_LDTR); - - dt.size = GET_SMSTATE(u32, smstate, 0x7e64); - dt.address = GET_SMSTATE(u64, smstate, 0x7e68); - ctxt->ops->set_gdt(ctxt, &dt); - - r = rsm_enter_protected_mode(ctxt, cr0, cr3, cr4); - if (r != X86EMUL_CONTINUE) - return r; - - for (i = 0; i < 6; i++) { - r = rsm_load_seg_64(ctxt, smstate, i); - if (r != X86EMUL_CONTINUE) - return r; - } - - return X86EMUL_CONTINUE; -} -#endif - static int em_rsm(struct x86_emulate_ctxt *ctxt) { - unsigned long cr0, cr4, efer; - char buf[512]; - u64 smbase; - int ret; - if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0) return emulate_ud(ctxt); - smbase = ctxt->ops->get_smbase(ctxt); - - ret = ctxt->ops->read_phys(ctxt, smbase + 0xfe00, buf, sizeof(buf)); - if (ret != X86EMUL_CONTINUE) - return X86EMUL_UNHANDLEABLE; - - if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_INSIDE_NMI_MASK) == 0) - ctxt->ops->set_nmi_mask(ctxt, false); - - ctxt->ops->exiting_smm(ctxt); - - /* - * Get back to real mode, to prepare a safe state in which to load - * CR0/CR3/CR4/EFER. It's all a bit more complicated if the vCPU - * supports long mode. - */ - if (emulator_has_longmode(ctxt)) { - struct desc_struct cs_desc; - - /* Zero CR4.PCIDE before CR0.PG. */ - cr4 = ctxt->ops->get_cr(ctxt, 4); - if (cr4 & X86_CR4_PCIDE) - ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PCIDE); - - /* A 32-bit code segment is required to clear EFER.LMA. */ - memset(&cs_desc, 0, sizeof(cs_desc)); - cs_desc.type = 0xb; - cs_desc.s = cs_desc.g = cs_desc.p = 1; - ctxt->ops->set_segment(ctxt, 0, &cs_desc, 0, VCPU_SREG_CS); - } - - /* For the 64-bit case, this will clear EFER.LMA. */ - cr0 = ctxt->ops->get_cr(ctxt, 0); - if (cr0 & X86_CR0_PE) - ctxt->ops->set_cr(ctxt, 0, cr0 & ~(X86_CR0_PG | X86_CR0_PE)); - - if (emulator_has_longmode(ctxt)) { - /* Clear CR4.PAE before clearing EFER.LME. */ - cr4 = ctxt->ops->get_cr(ctxt, 4); - if (cr4 & X86_CR4_PAE) - ctxt->ops->set_cr(ctxt, 4, cr4 & ~X86_CR4_PAE); - - /* And finally go back to 32-bit mode. */ - efer = 0; - ctxt->ops->set_msr(ctxt, MSR_EFER, efer); - } - - /* - * Give leave_smm() a chance to make ISA-specific changes to the vCPU - * state (e.g. enter guest mode) before loading state from the SMM - * state-save area. - */ - if (ctxt->ops->leave_smm(ctxt, buf)) - goto emulate_shutdown; - -#ifdef CONFIG_X86_64 - if (emulator_has_longmode(ctxt)) - ret = rsm_load_state_64(ctxt, buf); - else -#endif - ret = rsm_load_state_32(ctxt, buf); - - if (ret != X86EMUL_CONTINUE) - goto emulate_shutdown; + if (ctxt->ops->leave_smm(ctxt)) + ctxt->ops->triple_fault(ctxt); - /* - * Note, the ctxt->ops callbacks are responsible for handling side - * effects when writing MSRs and CRs, e.g. MMU context resets, CPUID - * runtime updates, etc... If that changes, e.g. this flow is moved - * out of the emulator to make it look more like enter_smm(), then - * those side effects need to be explicitly handled for both success - * and shutdown. - */ return emulator_recalc_and_set_mode(ctxt); - -emulate_shutdown: - ctxt->ops->triple_fault(ctxt); - return X86EMUL_CONTINUE; } static void diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 0adf4a437e85..2c7f2a26421e 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -23,22 +23,25 @@ #include "ioapic.h" #include "cpuid.h" #include "hyperv.h" +#include "mmu.h" #include "xen.h" #include <linux/cpu.h> #include <linux/kvm_host.h> #include <linux/highmem.h> #include <linux/sched/cputime.h> +#include <linux/spinlock.h> #include <linux/eventfd.h> #include <asm/apicdef.h> +#include <asm/mshyperv.h> #include <trace/events/kvm.h> #include "trace.h" #include "irq.h" #include "fpu.h" -#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64) +#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, HV_VCPUS_PER_SPARSE_BANK) static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer, bool vcpu_kick); @@ -897,13 +900,15 @@ bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled); -bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu, - struct hv_vp_assist_page *assist_page) +int kvm_hv_get_assist_page(struct kvm_vcpu *vcpu) { - if (!kvm_hv_assist_page_enabled(vcpu)) - return false; - return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, - assist_page, sizeof(*assist_page)); + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + if (!hv_vcpu || !kvm_hv_assist_page_enabled(vcpu)) + return -EFAULT; + + return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data, + &hv_vcpu->vp_assist_page, sizeof(struct hv_vp_assist_page)); } EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page); @@ -954,6 +959,11 @@ int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu) hv_vcpu->vp_index = vcpu->vcpu_idx; + for (i = 0; i < HV_NR_TLB_FLUSH_FIFOS; i++) { + INIT_KFIFO(hv_vcpu->tlb_flush_fifo[i].entries); + spin_lock_init(&hv_vcpu->tlb_flush_fifo[i].write_lock); + } + return 0; } @@ -1736,6 +1746,28 @@ static void sparse_set_to_vcpu_mask(struct kvm *kvm, u64 *sparse_banks, } } +static bool hv_is_vp_in_sparse_set(u32 vp_id, u64 valid_bank_mask, u64 sparse_banks[]) +{ + int valid_bit_nr = vp_id / HV_VCPUS_PER_SPARSE_BANK; + unsigned long sbank; + + if (!test_bit(valid_bit_nr, (unsigned long *)&valid_bank_mask)) + return false; + + /* + * The index into the sparse bank is the number of preceding bits in + * the valid mask. Optimize for VMs with <64 vCPUs by skipping the + * fancy math if there can't possibly be preceding bits. + */ + if (valid_bit_nr) + sbank = hweight64(valid_bank_mask & GENMASK_ULL(valid_bit_nr - 1, 0)); + else + sbank = 0; + + return test_bit(vp_id % HV_VCPUS_PER_SPARSE_BANK, + (unsigned long *)&sparse_banks[sbank]); +} + struct kvm_hv_hcall { u64 param; u64 ingpa; @@ -1749,57 +1781,173 @@ struct kvm_hv_hcall { sse128_t xmm[HV_HYPERCALL_MAX_XMM_REGISTERS]; }; -static u64 kvm_get_sparse_vp_set(struct kvm *kvm, struct kvm_hv_hcall *hc, - int consumed_xmm_halves, - u64 *sparse_banks, gpa_t offset) -{ - u16 var_cnt; - int i; - - if (hc->var_cnt > 64) - return -EINVAL; - /* Ignore banks that cannot possibly contain a legal VP index. */ - var_cnt = min_t(u16, hc->var_cnt, KVM_HV_MAX_SPARSE_VCPU_SET_BITS); +static int kvm_hv_get_hc_data(struct kvm *kvm, struct kvm_hv_hcall *hc, + u16 orig_cnt, u16 cnt_cap, u64 *data, + int consumed_xmm_halves, gpa_t offset) +{ + /* + * Preserve the original count when ignoring entries via a "cap", KVM + * still needs to validate the guest input (though the non-XMM path + * punts on the checks). + */ + u16 cnt = min(orig_cnt, cnt_cap); + int i, j; if (hc->fast) { /* * Each XMM holds two sparse banks, but do not count halves that * have already been consumed for hypercall parameters. */ - if (hc->var_cnt > 2 * HV_HYPERCALL_MAX_XMM_REGISTERS - consumed_xmm_halves) + if (orig_cnt > 2 * HV_HYPERCALL_MAX_XMM_REGISTERS - consumed_xmm_halves) return HV_STATUS_INVALID_HYPERCALL_INPUT; - for (i = 0; i < var_cnt; i++) { - int j = i + consumed_xmm_halves; + + for (i = 0; i < cnt; i++) { + j = i + consumed_xmm_halves; if (j % 2) - sparse_banks[i] = sse128_hi(hc->xmm[j / 2]); + data[i] = sse128_hi(hc->xmm[j / 2]); else - sparse_banks[i] = sse128_lo(hc->xmm[j / 2]); + data[i] = sse128_lo(hc->xmm[j / 2]); } return 0; } - return kvm_read_guest(kvm, hc->ingpa + offset, sparse_banks, - var_cnt * sizeof(*sparse_banks)); + return kvm_read_guest(kvm, hc->ingpa + offset, data, + cnt * sizeof(*data)); +} + +static u64 kvm_get_sparse_vp_set(struct kvm *kvm, struct kvm_hv_hcall *hc, + u64 *sparse_banks, int consumed_xmm_halves, + gpa_t offset) +{ + if (hc->var_cnt > HV_MAX_SPARSE_VCPU_BANKS) + return -EINVAL; + + /* Cap var_cnt to ignore banks that cannot contain a legal VP index. */ + return kvm_hv_get_hc_data(kvm, hc, hc->var_cnt, KVM_HV_MAX_SPARSE_VCPU_SET_BITS, + sparse_banks, consumed_xmm_halves, offset); +} + +static int kvm_hv_get_tlb_flush_entries(struct kvm *kvm, struct kvm_hv_hcall *hc, u64 entries[], + int consumed_xmm_halves, gpa_t offset) +{ + return kvm_hv_get_hc_data(kvm, hc, hc->rep_cnt, hc->rep_cnt, + entries, consumed_xmm_halves, offset); +} + +static void hv_tlb_flush_enqueue(struct kvm_vcpu *vcpu, + struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo, + u64 *entries, int count) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + u64 flush_all_entry = KVM_HV_TLB_FLUSHALL_ENTRY; + + if (!hv_vcpu) + return; + + spin_lock(&tlb_flush_fifo->write_lock); + + /* + * All entries should fit on the fifo leaving one free for 'flush all' + * entry in case another request comes in. In case there's not enough + * space, just put 'flush all' entry there. + */ + if (count && entries && count < kfifo_avail(&tlb_flush_fifo->entries)) { + WARN_ON(kfifo_in(&tlb_flush_fifo->entries, entries, count) != count); + goto out_unlock; + } + + /* + * Note: full fifo always contains 'flush all' entry, no need to check the + * return value. + */ + kfifo_in(&tlb_flush_fifo->entries, &flush_all_entry, 1); + +out_unlock: + spin_unlock(&tlb_flush_fifo->write_lock); +} + +int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + u64 entries[KVM_HV_TLB_FLUSH_FIFO_SIZE]; + int i, j, count; + gva_t gva; + + if (!tdp_enabled || !hv_vcpu) + return -EINVAL; + + tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu)); + + count = kfifo_out(&tlb_flush_fifo->entries, entries, KVM_HV_TLB_FLUSH_FIFO_SIZE); + + for (i = 0; i < count; i++) { + if (entries[i] == KVM_HV_TLB_FLUSHALL_ENTRY) + goto out_flush_all; + + /* + * Lower 12 bits of 'address' encode the number of additional + * pages to flush. + */ + gva = entries[i] & PAGE_MASK; + for (j = 0; j < (entries[i] & ~PAGE_MASK) + 1; j++) + static_call(kvm_x86_flush_tlb_gva)(vcpu, gva + j * PAGE_SIZE); + + ++vcpu->stat.tlb_flush; + } + return 0; + +out_flush_all: + kfifo_reset_out(&tlb_flush_fifo->entries); + + /* Fall back to full flush. */ + return -ENOSPC; } static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) { + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + u64 *sparse_banks = hv_vcpu->sparse_banks; struct kvm *kvm = vcpu->kvm; struct hv_tlb_flush_ex flush_ex; struct hv_tlb_flush flush; DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS); + struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; + /* + * Normally, there can be no more than 'KVM_HV_TLB_FLUSH_FIFO_SIZE' + * entries on the TLB flush fifo. The last entry, however, needs to be + * always left free for 'flush all' entry which gets placed when + * there is not enough space to put all the requested entries. + */ + u64 __tlb_flush_entries[KVM_HV_TLB_FLUSH_FIFO_SIZE - 1]; + u64 *tlb_flush_entries; u64 valid_bank_mask; - u64 sparse_banks[KVM_HV_MAX_SPARSE_VCPU_SET_BITS]; + struct kvm_vcpu *v; + unsigned long i; bool all_cpus; + int consumed_xmm_halves = 0; + gpa_t data_offset; /* - * The Hyper-V TLFS doesn't allow more than 64 sparse banks, e.g. the - * valid mask is a u64. Fail the build if KVM's max allowed number of - * vCPUs (>4096) would exceed this limit, KVM will additional changes - * for Hyper-V support to avoid setting the guest up to fail. + * The Hyper-V TLFS doesn't allow more than HV_MAX_SPARSE_VCPU_BANKS + * sparse banks. Fail the build if KVM's max allowed number of + * vCPUs (>4096) exceeds this limit. */ - BUILD_BUG_ON(KVM_HV_MAX_SPARSE_VCPU_SET_BITS > 64); + BUILD_BUG_ON(KVM_HV_MAX_SPARSE_VCPU_SET_BITS > HV_MAX_SPARSE_VCPU_BANKS); + + /* + * 'Slow' hypercall's first parameter is the address in guest's memory + * where hypercall parameters are placed. This is either a GPA or a + * nested GPA when KVM is handling the call from L2 ('direct' TLB + * flush). Translate the address here so the memory can be uniformly + * read with kvm_read_guest(). + */ + if (!hc->fast && is_guest_mode(vcpu)) { + hc->ingpa = translate_nested_gpa(vcpu, hc->ingpa, 0, NULL); + if (unlikely(hc->ingpa == INVALID_GPA)) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + } if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE) { @@ -1807,14 +1955,17 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) flush.address_space = hc->ingpa; flush.flags = hc->outgpa; flush.processor_mask = sse128_lo(hc->xmm[0]); + consumed_xmm_halves = 1; } else { if (unlikely(kvm_read_guest(kvm, hc->ingpa, &flush, sizeof(flush)))) return HV_STATUS_INVALID_HYPERCALL_INPUT; + data_offset = sizeof(flush); } trace_kvm_hv_flush_tlb(flush.processor_mask, - flush.address_space, flush.flags); + flush.address_space, flush.flags, + is_guest_mode(vcpu)); valid_bank_mask = BIT_ULL(0); sparse_banks[0] = flush.processor_mask; @@ -1834,16 +1985,18 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) flush_ex.flags = hc->outgpa; memcpy(&flush_ex.hv_vp_set, &hc->xmm[0], sizeof(hc->xmm[0])); + consumed_xmm_halves = 2; } else { if (unlikely(kvm_read_guest(kvm, hc->ingpa, &flush_ex, sizeof(flush_ex)))) return HV_STATUS_INVALID_HYPERCALL_INPUT; + data_offset = sizeof(flush_ex); } trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask, flush_ex.hv_vp_set.format, flush_ex.address_space, - flush_ex.flags); + flush_ex.flags, is_guest_mode(vcpu)); valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask; all_cpus = flush_ex.hv_vp_set.format != @@ -1852,29 +2005,95 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) if (hc->var_cnt != hweight64(valid_bank_mask)) return HV_STATUS_INVALID_HYPERCALL_INPUT; - if (all_cpus) - goto do_flush; + if (!all_cpus) { + if (!hc->var_cnt) + goto ret_success; - if (!hc->var_cnt) - goto ret_success; + if (kvm_get_sparse_vp_set(kvm, hc, sparse_banks, + consumed_xmm_halves, data_offset)) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + } - if (kvm_get_sparse_vp_set(kvm, hc, 2, sparse_banks, - offsetof(struct hv_tlb_flush_ex, - hv_vp_set.bank_contents))) + /* + * Hyper-V TLFS doesn't explicitly forbid non-empty sparse vCPU + * banks (and, thus, non-zero 'var_cnt') for the 'all vCPUs' + * case (HV_GENERIC_SET_ALL). Always adjust data_offset and + * consumed_xmm_halves to make sure TLB flush entries are read + * from the correct offset. + */ + data_offset += hc->var_cnt * sizeof(sparse_banks[0]); + consumed_xmm_halves += hc->var_cnt; + } + + if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE || + hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX || + hc->rep_cnt > ARRAY_SIZE(__tlb_flush_entries)) { + tlb_flush_entries = NULL; + } else { + if (kvm_hv_get_tlb_flush_entries(kvm, hc, __tlb_flush_entries, + consumed_xmm_halves, data_offset)) return HV_STATUS_INVALID_HYPERCALL_INPUT; + tlb_flush_entries = __tlb_flush_entries; } -do_flush: /* * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't * analyze it here, flush TLB regardless of the specified address space. */ - if (all_cpus) { - kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH_GUEST); - } else { + if (all_cpus && !is_guest_mode(vcpu)) { + kvm_for_each_vcpu(i, v, kvm) { + tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(v, false); + hv_tlb_flush_enqueue(v, tlb_flush_fifo, + tlb_flush_entries, hc->rep_cnt); + } + + kvm_make_all_cpus_request(kvm, KVM_REQ_HV_TLB_FLUSH); + } else if (!is_guest_mode(vcpu)) { sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask, vcpu_mask); - kvm_make_vcpus_request_mask(kvm, KVM_REQ_TLB_FLUSH_GUEST, vcpu_mask); + for_each_set_bit(i, vcpu_mask, KVM_MAX_VCPUS) { + v = kvm_get_vcpu(kvm, i); + if (!v) + continue; + tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(v, false); + hv_tlb_flush_enqueue(v, tlb_flush_fifo, + tlb_flush_entries, hc->rep_cnt); + } + + kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); + } else { + struct kvm_vcpu_hv *hv_v; + + bitmap_zero(vcpu_mask, KVM_MAX_VCPUS); + + kvm_for_each_vcpu(i, v, kvm) { + hv_v = to_hv_vcpu(v); + + /* + * The following check races with nested vCPUs entering/exiting + * and/or migrating between L1's vCPUs, however the only case when + * KVM *must* flush the TLB is when the target L2 vCPU keeps + * running on the same L1 vCPU from the moment of the request until + * kvm_hv_flush_tlb() returns. TLB is fully flushed in all other + * cases, e.g. when the target L2 vCPU migrates to a different L1 + * vCPU or when the corresponding L1 vCPU temporary switches to a + * different L2 vCPU while the request is being processed. + */ + if (!hv_v || hv_v->nested.vm_id != hv_vcpu->nested.vm_id) + continue; + + if (!all_cpus && + !hv_is_vp_in_sparse_set(hv_v->nested.vp_id, valid_bank_mask, + sparse_banks)) + continue; + + __set_bit(i, vcpu_mask); + tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(v, true); + hv_tlb_flush_enqueue(v, tlb_flush_fifo, + tlb_flush_entries, hc->rep_cnt); + } + + kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH, vcpu_mask); } ret_success: @@ -1883,8 +2102,8 @@ ret_success: ((u64)hc->rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET); } -static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector, - unsigned long *vcpu_bitmap) +static void kvm_hv_send_ipi_to_many(struct kvm *kvm, u32 vector, + u64 *sparse_banks, u64 valid_bank_mask) { struct kvm_lapic_irq irq = { .delivery_mode = APIC_DM_FIXED, @@ -1894,7 +2113,9 @@ static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector, unsigned long i; kvm_for_each_vcpu(i, vcpu, kvm) { - if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) + if (sparse_banks && + !hv_is_vp_in_sparse_set(kvm_hv_get_vpindex(vcpu), + valid_bank_mask, sparse_banks)) continue; /* We fail only when APIC is disabled */ @@ -1904,12 +2125,12 @@ static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector, static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) { + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + u64 *sparse_banks = hv_vcpu->sparse_banks; struct kvm *kvm = vcpu->kvm; struct hv_send_ipi_ex send_ipi_ex; struct hv_send_ipi send_ipi; - DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS); u64 valid_bank_mask; - u64 sparse_banks[KVM_HV_MAX_SPARSE_VCPU_SET_BITS]; u32 vector; bool all_cpus; @@ -1959,7 +2180,7 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc) if (!hc->var_cnt) goto ret_success; - if (kvm_get_sparse_vp_set(kvm, hc, 1, sparse_banks, + if (kvm_get_sparse_vp_set(kvm, hc, sparse_banks, 1, offsetof(struct hv_send_ipi_ex, vp_set.bank_contents))) return HV_STATUS_INVALID_HYPERCALL_INPUT; @@ -1969,13 +2190,10 @@ check_and_send_ipi: if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR)) return HV_STATUS_INVALID_HYPERCALL_INPUT; - if (all_cpus) { - kvm_send_ipi_to_many(kvm, vector, NULL); - } else { - sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask, vcpu_mask); - - kvm_send_ipi_to_many(kvm, vector, vcpu_mask); - } + if (all_cpus) + kvm_hv_send_ipi_to_many(kvm, vector, NULL, 0); + else + kvm_hv_send_ipi_to_many(kvm, vector, sparse_banks, valid_bank_mask); ret_success: return HV_STATUS_SUCCESS; @@ -2062,10 +2280,25 @@ static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result) static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result) { + u32 tlb_lock_count = 0; + int ret; + + if (hv_result_success(result) && is_guest_mode(vcpu) && + kvm_hv_is_tlb_flush_hcall(vcpu) && + kvm_read_guest(vcpu->kvm, to_hv_vcpu(vcpu)->nested.pa_page_gpa, + &tlb_lock_count, sizeof(tlb_lock_count))) + result = HV_STATUS_INVALID_HYPERCALL_INPUT; + trace_kvm_hv_hypercall_done(result); kvm_hv_hypercall_set_result(vcpu, result); ++vcpu->stat.hypercalls; - return kvm_skip_emulated_instruction(vcpu); + + ret = kvm_skip_emulated_instruction(vcpu); + + if (tlb_lock_count) + kvm_x86_ops.nested_ops->hv_inject_synthetic_vmexit_post_tlb_flush(vcpu); + + return ret; } static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu) @@ -2502,6 +2735,7 @@ int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, ent->ebx |= HV_DEBUGGING; ent->edx |= HV_X64_GUEST_DEBUGGING_AVAILABLE; ent->edx |= HV_FEATURE_DEBUG_MSRS_AVAILABLE; + ent->edx |= HV_FEATURE_EXT_GVA_RANGES_FLUSH; /* * Direct Synthetic timers only make sense with in-kernel @@ -2545,6 +2779,7 @@ int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, case HYPERV_CPUID_NESTED_FEATURES: ent->eax = evmcs_ver; + ent->eax |= HV_X64_NESTED_DIRECT_FLUSH; ent->eax |= HV_X64_NESTED_MSR_BITMAP; ent->ebx |= HV_X64_NESTED_EVMCS1_PERF_GLOBAL_CTRL; break; diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 1030b1b50552..9f96414a31c5 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -22,6 +22,7 @@ #define __ARCH_X86_KVM_HYPERV_H__ #include <linux/kvm_host.h> +#include "x86.h" /* "Hv#1" signature */ #define HYPERV_CPUID_SIGNATURE_EAX 0x31237648 @@ -107,8 +108,7 @@ int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages); void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu); bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu); -bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu, - struct hv_vp_assist_page *assist_page); +int kvm_hv_get_assist_page(struct kvm_vcpu *vcpu); static inline struct kvm_vcpu_hv_stimer *to_hv_stimer(struct kvm_vcpu *vcpu, int timer_index) @@ -151,4 +151,64 @@ int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args); int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, struct kvm_cpuid_entry2 __user *entries); +static inline struct kvm_vcpu_hv_tlb_flush_fifo *kvm_hv_get_tlb_flush_fifo(struct kvm_vcpu *vcpu, + bool is_guest_mode) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + int i = is_guest_mode ? HV_L2_TLB_FLUSH_FIFO : + HV_L1_TLB_FLUSH_FIFO; + + return &hv_vcpu->tlb_flush_fifo[i]; +} + +static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; + + if (!to_hv_vcpu(vcpu) || !kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu)) + return; + + tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu, is_guest_mode(vcpu)); + + kfifo_reset_out(&tlb_flush_fifo->entries); +} + +static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + return hv_vcpu && + (hv_vcpu->cpuid_cache.nested_eax & HV_X64_NESTED_DIRECT_FLUSH); +} + +static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + u16 code; + + if (!hv_vcpu) + return false; + + code = is_64_bit_hypercall(vcpu) ? kvm_rcx_read(vcpu) : + kvm_rax_read(vcpu); + + return (code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE || + code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || + code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX || + code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX); +} + +static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu) +{ + if (!to_hv_vcpu(vcpu)) + return 0; + + if (!kvm_hv_assist_page_enabled(vcpu)) + return 0; + + return kvm_hv_get_assist_page(vcpu); +} + +int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu); + #endif diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c index f371f1292ca3..a70952eca905 100644 --- a/arch/x86/kvm/irq.c +++ b/arch/x86/kvm/irq.c @@ -31,7 +31,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) return r; } -EXPORT_SYMBOL(kvm_cpu_has_pending_timer); /* * check if there is a pending userspace external interrupt @@ -150,7 +149,6 @@ void kvm_inject_pending_timer_irqs(struct kvm_vcpu *vcpu) if (kvm_xen_timer_enabled(vcpu)) kvm_xen_inject_timer_irqs(vcpu); } -EXPORT_SYMBOL_GPL(kvm_inject_pending_timer_irqs); void __kvm_migrate_timers(struct kvm_vcpu *vcpu) { @@ -165,3 +163,8 @@ bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args) return resample ? irqchip_kernel(kvm) : irqchip_in_kernel(kvm); } + +bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) +{ + return irqchip_in_kernel(kvm); +} diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h index 3febc342360c..c09174f73a34 100644 --- a/arch/x86/kvm/kvm_cache_regs.h +++ b/arch/x86/kvm/kvm_cache_regs.h @@ -200,9 +200,4 @@ static inline bool is_guest_mode(struct kvm_vcpu *vcpu) return vcpu->arch.hflags & HF_GUEST_MASK; } -static inline bool is_smm(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.hflags & HF_SMM_MASK; -} - #endif diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h index 89246446d6aa..2d9662be8333 100644 --- a/arch/x86/kvm/kvm_emulate.h +++ b/arch/x86/kvm/kvm_emulate.h @@ -117,16 +117,6 @@ struct x86_emulate_ops { struct x86_exception *fault, bool system); /* - * read_phys: Read bytes of standard (non-emulated/special) memory. - * Used for descriptor reading. - * @addr: [IN ] Physical address from which to read. - * @val: [OUT] Value read from memory. - * @bytes: [IN ] Number of bytes to read from memory. - */ - int (*read_phys)(struct x86_emulate_ctxt *ctxt, unsigned long addr, - void *val, unsigned int bytes); - - /* * write_std: Write bytes of standard (non-emulated/special) memory. * Used for descriptor writing. * @addr: [IN ] Linear address to which to write. @@ -209,11 +199,8 @@ struct x86_emulate_ops { int (*cpl)(struct x86_emulate_ctxt *ctxt); void (*get_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong *dest); int (*set_dr)(struct x86_emulate_ctxt *ctxt, int dr, ulong value); - u64 (*get_smbase)(struct x86_emulate_ctxt *ctxt); - void (*set_smbase)(struct x86_emulate_ctxt *ctxt, u64 smbase); int (*set_msr_with_filter)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data); int (*get_msr_with_filter)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata); - int (*set_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data); int (*get_msr)(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 *pdata); int (*check_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc); int (*read_pmc)(struct x86_emulate_ctxt *ctxt, u32 pmc, u64 *pdata); @@ -234,8 +221,7 @@ struct x86_emulate_ops { void (*set_nmi_mask)(struct x86_emulate_ctxt *ctxt, bool masked); unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt); - void (*exiting_smm)(struct x86_emulate_ctxt *ctxt); - int (*leave_smm)(struct x86_emulate_ctxt *ctxt, const char *smstate); + int (*leave_smm)(struct x86_emulate_ctxt *ctxt); void (*triple_fault)(struct x86_emulate_ctxt *ctxt); int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr); }; @@ -292,7 +278,6 @@ enum x86emul_mode { /* These match some of the HF_* flags defined in kvm_host.h */ #define X86EMUL_GUEST_MASK (1 << 5) /* VCPU is in guest-mode */ #define X86EMUL_SMM_MASK (1 << 6) -#define X86EMUL_SMM_INSIDE_NMI_MASK (1 << 7) /* * fastop functions are declared as taking a never-defined fastop parameter, @@ -526,4 +511,35 @@ void emulator_invalidate_register_cache(struct x86_emulate_ctxt *ctxt); void emulator_writeback_register_cache(struct x86_emulate_ctxt *ctxt); bool emulator_can_use_gpa(struct x86_emulate_ctxt *ctxt); +static inline ulong reg_read(struct x86_emulate_ctxt *ctxt, unsigned nr) +{ + if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt)) + nr &= NR_EMULATOR_GPRS - 1; + + if (!(ctxt->regs_valid & (1 << nr))) { + ctxt->regs_valid |= 1 << nr; + ctxt->_regs[nr] = ctxt->ops->read_gpr(ctxt, nr); + } + return ctxt->_regs[nr]; +} + +static inline ulong *reg_write(struct x86_emulate_ctxt *ctxt, unsigned nr) +{ + if (KVM_EMULATOR_BUG_ON(nr >= NR_EMULATOR_GPRS, ctxt)) + nr &= NR_EMULATOR_GPRS - 1; + + BUILD_BUG_ON(sizeof(ctxt->regs_dirty) * BITS_PER_BYTE < NR_EMULATOR_GPRS); + BUILD_BUG_ON(sizeof(ctxt->regs_valid) * BITS_PER_BYTE < NR_EMULATOR_GPRS); + + ctxt->regs_valid |= 1 << nr; + ctxt->regs_dirty |= 1 << nr; + return &ctxt->_regs[nr]; +} + +static inline ulong *reg_rmw(struct x86_emulate_ctxt *ctxt, unsigned nr) +{ + reg_read(ctxt, nr); + return reg_write(ctxt, nr); +} + #endif /* _ASM_X86_KVM_X86_EMULATE_H */ diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index d7639d126e6c..4efdb4a4d72c 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -42,6 +42,7 @@ #include "x86.h" #include "cpuid.h" #include "hyperv.h" +#include "smm.h" #ifndef CONFIG_X86_64 #define mod_64(x, y) ((x) - (y) * div64_u64(x, y)) @@ -159,7 +160,6 @@ bool kvm_can_use_hv_timer(struct kvm_vcpu *vcpu) && !(kvm_mwait_in_guest(vcpu->kvm) || kvm_can_post_timer_interrupt(vcpu)); } -EXPORT_SYMBOL_GPL(kvm_can_use_hv_timer); static bool kvm_use_posted_timer_interrupt(struct kvm_vcpu *vcpu) { @@ -1170,9 +1170,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode, break; case APIC_DM_SMI: - result = 1; - kvm_make_request(KVM_REQ_SMI, vcpu); - kvm_vcpu_kick(vcpu); + if (!kvm_inject_smi(vcpu)) { + kvm_vcpu_kick(vcpu); + result = 1; + } break; case APIC_DM_NMI: @@ -1912,7 +1913,6 @@ bool kvm_lapic_hv_timer_in_use(struct kvm_vcpu *vcpu) return vcpu->arch.apic->lapic_timer.hv_timer_in_use; } -EXPORT_SYMBOL_GPL(kvm_lapic_hv_timer_in_use); static void cancel_hv_timer(struct kvm_lapic *apic) { @@ -2430,7 +2430,6 @@ void kvm_apic_update_apicv(struct kvm_vcpu *vcpu) apic->isr_count = count_vectors(apic->regs + APIC_ISR); } } -EXPORT_SYMBOL_GPL(kvm_apic_update_apicv); void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event) { @@ -2722,8 +2721,6 @@ static int kvm_apic_state_fixup(struct kvm_vcpu *vcpu, icr = __kvm_lapic_get_reg64(s->regs, APIC_ICR); __kvm_lapic_set_reg(s->regs, APIC_ICR2, icr >> 32); } - } else { - kvm_lapic_xapic_id_updated(vcpu->arch.apic); } return 0; @@ -2759,6 +2756,9 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) } memcpy(vcpu->arch.apic->regs, s->regs, sizeof(*s)); + if (!apic_x2apic_mode(apic)) + kvm_lapic_xapic_id_updated(apic); + atomic_set_release(&apic->vcpu->kvm->arch.apic_map_dirty, DIRTY); kvm_recalculate_apic_map(vcpu->kvm); kvm_apic_set_version(vcpu); diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index a5ac4a5a5179..28e3769066e2 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -7,7 +7,7 @@ #include <linux/kvm_host.h> #include "hyperv.h" -#include "kvm_cache_regs.h" +#include "smm.h" #define KVM_APIC_INIT 0 #define KVM_APIC_SIPI 1 diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index b6f96d47e596..835426254e76 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -22,6 +22,7 @@ #include "tdp_mmu.h" #include "x86.h" #include "kvm_cache_regs.h" +#include "smm.h" #include "kvm_emulate.h" #include "cpuid.h" #include "spte.h" @@ -802,15 +803,31 @@ static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) kvm_flush_remote_tlbs_with_address(kvm, gfn, 1); } -void account_huge_nx_page(struct kvm *kvm, struct kvm_mmu_page *sp) +void track_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp) { - if (sp->lpage_disallowed) + /* + * If it's possible to replace the shadow page with an NX huge page, + * i.e. if the shadow page is the only thing currently preventing KVM + * from using a huge page, add the shadow page to the list of "to be + * zapped for NX recovery" pages. Note, the shadow page can already be + * on the list if KVM is reusing an existing shadow page, i.e. if KVM + * links a shadow page at multiple points. + */ + if (!list_empty(&sp->possible_nx_huge_page_link)) return; ++kvm->stat.nx_lpage_splits; - list_add_tail(&sp->lpage_disallowed_link, - &kvm->arch.lpage_disallowed_mmu_pages); - sp->lpage_disallowed = true; + list_add_tail(&sp->possible_nx_huge_page_link, + &kvm->arch.possible_nx_huge_pages); +} + +static void account_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp, + bool nx_huge_page_possible) +{ + sp->nx_huge_page_disallowed = true; + + if (nx_huge_page_possible) + track_possible_nx_huge_page(kvm, sp); } static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) @@ -830,11 +847,20 @@ static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) kvm_mmu_gfn_allow_lpage(slot, gfn); } -void unaccount_huge_nx_page(struct kvm *kvm, struct kvm_mmu_page *sp) +void untrack_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp) { + if (list_empty(&sp->possible_nx_huge_page_link)) + return; + --kvm->stat.nx_lpage_splits; - sp->lpage_disallowed = false; - list_del(&sp->lpage_disallowed_link); + list_del_init(&sp->possible_nx_huge_page_link); +} + +static void unaccount_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp) +{ + sp->nx_huge_page_disallowed = false; + + untrack_possible_nx_huge_page(kvm, sp); } static struct kvm_memory_slot * @@ -1645,7 +1671,7 @@ static int is_empty_shadow_page(u64 *spt) u64 *pos; u64 *end; - for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) + for (pos = spt, end = pos + SPTE_ENT_PER_PAGE; pos != end; pos++) if (is_shadow_present_pte(*pos)) { printk(KERN_ERR "%s: %p %llx\n", __func__, pos, *pos); @@ -1793,7 +1819,7 @@ static int __mmu_unsync_walk(struct kvm_mmu_page *sp, continue; } - child = to_shadow_page(ent & SPTE_BASE_ADDR_MASK); + child = spte_to_child_sp(ent); if (child->unsync_children) { if (mmu_pages_add(pvec, child, i)) @@ -1894,7 +1920,7 @@ static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp) if (sp->role.invalid) return true; - /* TDP MMU pages due not use the MMU generation. */ + /* TDP MMU pages do not use the MMU generation. */ return !sp->tdp_mmu_page && unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen); } @@ -2129,6 +2155,8 @@ static struct kvm_mmu_page *kvm_mmu_alloc_shadow_page(struct kvm *kvm, set_page_private(virt_to_page(sp->spt), (unsigned long)sp); + INIT_LIST_HEAD(&sp->possible_nx_huge_page_link); + /* * active_mmu_pages must be a FIFO list, as kvm_zap_obsolete_pages() * depends on valid pages being added to the head of the list. See @@ -2350,7 +2378,7 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, * so we should update the spte at this point to get * a new sp with the correct access. */ - child = to_shadow_page(*sptep & SPTE_BASE_ADDR_MASK); + child = spte_to_child_sp(*sptep); if (child->role.access == direct_access) return; @@ -2371,7 +2399,7 @@ static int mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp, if (is_last_spte(pte, sp->role.level)) { drop_spte(kvm, spte); } else { - child = to_shadow_page(pte & SPTE_BASE_ADDR_MASK); + child = spte_to_child_sp(pte); drop_parent_pte(child, spte); /* @@ -2487,8 +2515,8 @@ static bool __kvm_mmu_prepare_zap_page(struct kvm *kvm, zapped_root = !is_obsolete_sp(kvm, sp); } - if (sp->lpage_disallowed) - unaccount_huge_nx_page(kvm, sp); + if (sp->nx_huge_page_disallowed) + unaccount_nx_huge_page(kvm, sp); sp->role.invalid = 1; @@ -2811,7 +2839,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, struct kvm_memory_slot *slot, struct kvm_mmu_page *child; u64 pte = *sptep; - child = to_shadow_page(pte & SPTE_BASE_ADDR_MASK); + child = spte_to_child_sp(pte); drop_parent_pte(child, sptep); flush = true; } else if (pfn != spte_to_pfn(*sptep)) { @@ -3085,7 +3113,8 @@ void disallowed_hugepage_adjust(struct kvm_page_fault *fault, u64 spte, int cur_ if (cur_level > PG_LEVEL_4K && cur_level == fault->goal_level && is_shadow_present_pte(spte) && - !is_large_pte(spte)) { + !is_large_pte(spte) && + spte_to_child_sp(spte)->nx_huge_page_disallowed) { /* * A small SPTE exists for this pfn, but FNAME(fetch) * and __direct_map would like to create a large PTE @@ -3127,9 +3156,9 @@ static int __direct_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) continue; link_shadow_page(vcpu, it.sptep, sp); - if (fault->is_tdp && fault->huge_page_disallowed && - fault->req_level >= it.level) - account_huge_nx_page(vcpu->kvm, sp); + if (fault->huge_page_disallowed) + account_nx_huge_page(vcpu->kvm, sp, + fault->req_level >= it.level); } if (WARN_ON_ONCE(it.level != fault->goal_level)) @@ -3149,8 +3178,13 @@ static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct * send_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, PAGE_SHIFT, tsk); } -static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, kvm_pfn_t pfn) +static int kvm_handle_error_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, kvm_pfn_t pfn) { + if (is_sigpending_pfn(pfn)) { + kvm_handle_signal_exit(vcpu); + return -EINTR; + } + /* * Do not cache the mmio info caused by writing the readonly gfn * into the spte otherwise read access on readonly gfn also can @@ -3172,7 +3206,7 @@ static int handle_abnormal_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fau { /* The pfn is invalid, report the error! */ if (unlikely(is_error_pfn(fault->pfn))) - return kvm_handle_bad_page(vcpu, fault->gfn, fault->pfn); + return kvm_handle_error_pfn(vcpu, fault->gfn, fault->pfn); if (unlikely(!fault->slot)) { gva_t gva = fault->is_tdp ? 0 : fault->addr; @@ -3423,7 +3457,11 @@ static void mmu_free_root_page(struct kvm *kvm, hpa_t *root_hpa, if (!VALID_PAGE(*root_hpa)) return; - sp = to_shadow_page(*root_hpa & SPTE_BASE_ADDR_MASK); + /* + * The "root" may be a special root, e.g. a PAE entry, treat it as a + * SPTE to ensure any non-PA bits are dropped. + */ + sp = spte_to_child_sp(*root_hpa); if (WARN_ON(!sp)) return; @@ -3908,8 +3946,7 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) hpa_t root = vcpu->arch.mmu->pae_root[i]; if (IS_VALID_PAE_ROOT(root)) { - root &= SPTE_BASE_ADDR_MASK; - sp = to_shadow_page(root); + sp = spte_to_child_sp(root); mmu_sync_children(vcpu, sp, true); } } @@ -4170,7 +4207,7 @@ static int kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) } async = false; - fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, &async, + fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, false, &async, fault->write, &fault->map_writable, &fault->hva); if (!async) @@ -4187,7 +4224,12 @@ static int kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) } } - fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, NULL, + /* + * Allow gup to bail on pending non-fatal signals when it's also allowed + * to wait for IO. Note, gup always bails if it is unable to quickly + * get a page and a fatal signal, i.e. SIGKILL, is pending. + */ + fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, true, NULL, fault->write, &fault->map_writable, &fault->hva); return RET_PF_CONTINUE; @@ -5972,7 +6014,7 @@ int kvm_mmu_init_vm(struct kvm *kvm) INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages); - INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages); + INIT_LIST_HEAD(&kvm->arch.possible_nx_huge_pages); spin_lock_init(&kvm->arch.mmu_unsync_pages_lock); r = kvm_mmu_init_tdp_mmu(kvm); @@ -6657,7 +6699,7 @@ static int set_nx_huge_pages(const char *val, const struct kernel_param *kp) kvm_mmu_zap_all_fast(kvm); mutex_unlock(&kvm->slots_lock); - wake_up_process(kvm->arch.nx_lpage_recovery_thread); + wake_up_process(kvm->arch.nx_huge_page_recovery_thread); } mutex_unlock(&kvm_lock); } @@ -6789,7 +6831,7 @@ static int set_nx_huge_pages_recovery_param(const char *val, const struct kernel mutex_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) - wake_up_process(kvm->arch.nx_lpage_recovery_thread); + wake_up_process(kvm->arch.nx_huge_page_recovery_thread); mutex_unlock(&kvm_lock); } @@ -6797,9 +6839,10 @@ static int set_nx_huge_pages_recovery_param(const char *val, const struct kernel return err; } -static void kvm_recover_nx_lpages(struct kvm *kvm) +static void kvm_recover_nx_huge_pages(struct kvm *kvm) { unsigned long nx_lpage_splits = kvm->stat.nx_lpage_splits; + struct kvm_memory_slot *slot; int rcu_idx; struct kvm_mmu_page *sp; unsigned int ratio; @@ -6820,24 +6863,55 @@ static void kvm_recover_nx_lpages(struct kvm *kvm) ratio = READ_ONCE(nx_huge_pages_recovery_ratio); to_zap = ratio ? DIV_ROUND_UP(nx_lpage_splits, ratio) : 0; for ( ; to_zap; --to_zap) { - if (list_empty(&kvm->arch.lpage_disallowed_mmu_pages)) + if (list_empty(&kvm->arch.possible_nx_huge_pages)) break; /* * We use a separate list instead of just using active_mmu_pages - * because the number of lpage_disallowed pages is expected to - * be relatively small compared to the total. + * because the number of shadow pages that be replaced with an + * NX huge page is expected to be relatively small compared to + * the total number of shadow pages. And because the TDP MMU + * doesn't use active_mmu_pages. */ - sp = list_first_entry(&kvm->arch.lpage_disallowed_mmu_pages, + sp = list_first_entry(&kvm->arch.possible_nx_huge_pages, struct kvm_mmu_page, - lpage_disallowed_link); - WARN_ON_ONCE(!sp->lpage_disallowed); - if (is_tdp_mmu_page(sp)) { + possible_nx_huge_page_link); + WARN_ON_ONCE(!sp->nx_huge_page_disallowed); + WARN_ON_ONCE(!sp->role.direct); + + /* + * Unaccount and do not attempt to recover any NX Huge Pages + * that are being dirty tracked, as they would just be faulted + * back in as 4KiB pages. The NX Huge Pages in this slot will be + * recovered, along with all the other huge pages in the slot, + * when dirty logging is disabled. + * + * Since gfn_to_memslot() is relatively expensive, it helps to + * skip it if it the test cannot possibly return true. On the + * other hand, if any memslot has logging enabled, chances are + * good that all of them do, in which case unaccount_nx_huge_page() + * is much cheaper than zapping the page. + * + * If a memslot update is in progress, reading an incorrect value + * of kvm->nr_memslots_dirty_logging is not a problem: if it is + * becoming zero, gfn_to_memslot() will be done unnecessarily; if + * it is becoming nonzero, the page will be zapped unnecessarily. + * Either way, this only affects efficiency in racy situations, + * and not correctness. + */ + slot = NULL; + if (atomic_read(&kvm->nr_memslots_dirty_logging)) { + slot = gfn_to_memslot(kvm, sp->gfn); + WARN_ON_ONCE(!slot); + } + + if (slot && kvm_slot_dirty_track_enabled(slot)) + unaccount_nx_huge_page(kvm, sp); + else if (is_tdp_mmu_page(sp)) flush |= kvm_tdp_mmu_zap_sp(kvm, sp); - } else { + else kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); - WARN_ON_ONCE(sp->lpage_disallowed); - } + WARN_ON_ONCE(sp->nx_huge_page_disallowed); if (need_resched() || rwlock_needbreak(&kvm->mmu_lock)) { kvm_mmu_remote_flush_or_zap(kvm, &invalid_list, flush); @@ -6857,7 +6931,7 @@ static void kvm_recover_nx_lpages(struct kvm *kvm) srcu_read_unlock(&kvm->srcu, rcu_idx); } -static long get_nx_lpage_recovery_timeout(u64 start_time) +static long get_nx_huge_page_recovery_timeout(u64 start_time) { bool enabled; uint period; @@ -6868,19 +6942,19 @@ static long get_nx_lpage_recovery_timeout(u64 start_time) : MAX_SCHEDULE_TIMEOUT; } -static int kvm_nx_lpage_recovery_worker(struct kvm *kvm, uintptr_t data) +static int kvm_nx_huge_page_recovery_worker(struct kvm *kvm, uintptr_t data) { u64 start_time; long remaining_time; while (true) { start_time = get_jiffies_64(); - remaining_time = get_nx_lpage_recovery_timeout(start_time); + remaining_time = get_nx_huge_page_recovery_timeout(start_time); set_current_state(TASK_INTERRUPTIBLE); while (!kthread_should_stop() && remaining_time > 0) { schedule_timeout(remaining_time); - remaining_time = get_nx_lpage_recovery_timeout(start_time); + remaining_time = get_nx_huge_page_recovery_timeout(start_time); set_current_state(TASK_INTERRUPTIBLE); } @@ -6889,7 +6963,7 @@ static int kvm_nx_lpage_recovery_worker(struct kvm *kvm, uintptr_t data) if (kthread_should_stop()) return 0; - kvm_recover_nx_lpages(kvm); + kvm_recover_nx_huge_pages(kvm); } } @@ -6897,17 +6971,17 @@ int kvm_mmu_post_init_vm(struct kvm *kvm) { int err; - err = kvm_vm_create_worker_thread(kvm, kvm_nx_lpage_recovery_worker, 0, + err = kvm_vm_create_worker_thread(kvm, kvm_nx_huge_page_recovery_worker, 0, "kvm-nx-lpage-recovery", - &kvm->arch.nx_lpage_recovery_thread); + &kvm->arch.nx_huge_page_recovery_thread); if (!err) - kthread_unpark(kvm->arch.nx_lpage_recovery_thread); + kthread_unpark(kvm->arch.nx_huge_page_recovery_thread); return err; } void kvm_mmu_pre_destroy_vm(struct kvm *kvm) { - if (kvm->arch.nx_lpage_recovery_thread) - kthread_stop(kvm->arch.nx_lpage_recovery_thread); + if (kvm->arch.nx_huge_page_recovery_thread) + kthread_stop(kvm->arch.nx_huge_page_recovery_thread); } diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index 582def531d4d..dbaf6755c5a7 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -57,7 +57,13 @@ struct kvm_mmu_page { bool tdp_mmu_page; bool unsync; u8 mmu_valid_gen; - bool lpage_disallowed; /* Can't be replaced by an equiv large page */ + + /* + * The shadow page can't be replaced by an equivalent huge page + * because it is being used to map an executable page in the guest + * and the NX huge page mitigation is enabled. + */ + bool nx_huge_page_disallowed; /* * The following two entries are used to key the shadow page in the @@ -100,7 +106,14 @@ struct kvm_mmu_page { }; }; - struct list_head lpage_disallowed_link; + /* + * Tracks shadow pages that, if zapped, would allow KVM to create an NX + * huge page. A shadow page will have nx_huge_page_disallowed set but + * not be on the list if a huge page is disallowed for other reasons, + * e.g. because KVM is shadowing a PTE at the same gfn, the memslot + * isn't properly aligned, etc... + */ + struct list_head possible_nx_huge_page_link; #ifdef CONFIG_X86_32 /* * Used out of the mmu-lock to avoid reading spte values while an @@ -120,18 +133,6 @@ struct kvm_mmu_page { extern struct kmem_cache *mmu_page_header_cache; -static inline struct kvm_mmu_page *to_shadow_page(hpa_t shadow_page) -{ - struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT); - - return (struct kvm_mmu_page *)page_private(page); -} - -static inline struct kvm_mmu_page *sptep_to_sp(u64 *sptep) -{ - return to_shadow_page(__pa(sptep)); -} - static inline int kvm_mmu_role_as_id(union kvm_mmu_page_role role) { return role.smm ? 1 : 0; @@ -315,7 +316,7 @@ void disallowed_hugepage_adjust(struct kvm_page_fault *fault, u64 spte, int cur_ void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc); -void account_huge_nx_page(struct kvm *kvm, struct kvm_mmu_page *sp); -void unaccount_huge_nx_page(struct kvm *kvm, struct kvm_mmu_page *sp); +void track_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp); +void untrack_possible_nx_huge_page(struct kvm *kvm, struct kvm_mmu_page *sp); #endif /* __KVM_X86_MMU_INTERNAL_H */ diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index 5ab5f94dcb6f..0f6455072055 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -713,9 +713,9 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, continue; link_shadow_page(vcpu, it.sptep, sp); - if (fault->huge_page_disallowed && - fault->req_level >= it.level) - account_huge_nx_page(vcpu->kvm, sp); + if (fault->huge_page_disallowed) + account_nx_huge_page(vcpu->kvm, sp, + fault->req_level >= it.level); } if (WARN_ON_ONCE(it.level != fault->goal_level)) diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c index 2e08b2a45361..c0fd7e049b4e 100644 --- a/arch/x86/kvm/mmu/spte.c +++ b/arch/x86/kvm/mmu/spte.c @@ -161,6 +161,18 @@ bool make_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, if (!prefetch) spte |= spte_shadow_accessed_mask(spte); + /* + * For simplicity, enforce the NX huge page mitigation even if not + * strictly necessary. KVM could ignore the mitigation if paging is + * disabled in the guest, as the guest doesn't have an page tables to + * abuse. But to safely ignore the mitigation, KVM would have to + * ensure a new MMU is loaded (or all shadow pages zapped) when CR0.PG + * is toggled on, and that's a net negative for performance when TDP is + * enabled. When TDP is disabled, KVM will always switch to a new MMU + * when CR0.PG is toggled, but leveraging that to ignore the mitigation + * would tie make_spte() further to vCPU/MMU state, and add complexity + * just to optimize a mode that is anything but performance critical. + */ if (level > PG_LEVEL_4K && (pte_access & ACC_EXEC_MASK) && is_nx_huge_page_enabled(vcpu->kvm)) { pte_access &= ~ACC_EXEC_MASK; diff --git a/arch/x86/kvm/mmu/spte.h b/arch/x86/kvm/mmu/spte.h index 7670c13ce251..1f03701b943a 100644 --- a/arch/x86/kvm/mmu/spte.h +++ b/arch/x86/kvm/mmu/spte.h @@ -188,7 +188,7 @@ extern u64 __read_mostly shadow_nonpresent_or_rsvd_mask; * should not modify the SPTE. * * Use a semi-arbitrary value that doesn't set RWX bits, i.e. is not-present on - * bot AMD and Intel CPUs, and doesn't set PFN bits, i.e. doesn't create a L1TF + * both AMD and Intel CPUs, and doesn't set PFN bits, i.e. doesn't create a L1TF * vulnerability. Use only low bits to avoid 64-bit immediates. * * Only used by the TDP MMU. @@ -219,6 +219,23 @@ static inline int spte_index(u64 *sptep) */ extern u64 __read_mostly shadow_nonpresent_or_rsvd_lower_gfn_mask; +static inline struct kvm_mmu_page *to_shadow_page(hpa_t shadow_page) +{ + struct page *page = pfn_to_page((shadow_page) >> PAGE_SHIFT); + + return (struct kvm_mmu_page *)page_private(page); +} + +static inline struct kvm_mmu_page *spte_to_child_sp(u64 spte) +{ + return to_shadow_page(spte & SPTE_BASE_ADDR_MASK); +} + +static inline struct kvm_mmu_page *sptep_to_sp(u64 *sptep) +{ + return to_shadow_page(__pa(sptep)); +} + static inline bool is_mmio_spte(u64 spte) { return (spte & shadow_mmio_mask) == shadow_mmio_value && diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 672f0432d777..771210ce5181 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -29,7 +29,6 @@ int kvm_mmu_init_tdp_mmu(struct kvm *kvm) kvm->arch.tdp_mmu_enabled = true; INIT_LIST_HEAD(&kvm->arch.tdp_mmu_roots); spin_lock_init(&kvm->arch.tdp_mmu_pages_lock); - INIT_LIST_HEAD(&kvm->arch.tdp_mmu_pages); kvm->arch.tdp_mmu_zap_wq = wq; return 1; } @@ -54,7 +53,7 @@ void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) /* Also waits for any queued work items. */ destroy_workqueue(kvm->arch.tdp_mmu_zap_wq); - WARN_ON(!list_empty(&kvm->arch.tdp_mmu_pages)); + WARN_ON(atomic64_read(&kvm->arch.tdp_mmu_pages)); WARN_ON(!list_empty(&kvm->arch.tdp_mmu_roots)); /* @@ -284,6 +283,8 @@ static struct kvm_mmu_page *tdp_mmu_alloc_sp(struct kvm_vcpu *vcpu) static void tdp_mmu_init_sp(struct kvm_mmu_page *sp, tdp_ptep_t sptep, gfn_t gfn, union kvm_mmu_page_role role) { + INIT_LIST_HEAD(&sp->possible_nx_huge_page_link); + set_page_private(virt_to_page(sp->spt), (unsigned long)sp); sp->role = role; @@ -375,11 +376,13 @@ static void handle_changed_spte_dirty_log(struct kvm *kvm, int as_id, gfn_t gfn, static void tdp_account_mmu_page(struct kvm *kvm, struct kvm_mmu_page *sp) { kvm_account_pgtable_pages((void *)sp->spt, +1); + atomic64_inc(&kvm->arch.tdp_mmu_pages); } static void tdp_unaccount_mmu_page(struct kvm *kvm, struct kvm_mmu_page *sp) { kvm_account_pgtable_pages((void *)sp->spt, -1); + atomic64_dec(&kvm->arch.tdp_mmu_pages); } /** @@ -395,14 +398,17 @@ static void tdp_mmu_unlink_sp(struct kvm *kvm, struct kvm_mmu_page *sp, bool shared) { tdp_unaccount_mmu_page(kvm, sp); + + if (!sp->nx_huge_page_disallowed) + return; + if (shared) spin_lock(&kvm->arch.tdp_mmu_pages_lock); else lockdep_assert_held_write(&kvm->mmu_lock); - list_del(&sp->link); - if (sp->lpage_disallowed) - unaccount_huge_nx_page(kvm, sp); + sp->nx_huge_page_disallowed = false; + untrack_possible_nx_huge_page(kvm, sp); if (shared) spin_unlock(&kvm->arch.tdp_mmu_pages_lock); @@ -1116,16 +1122,13 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, * @kvm: kvm instance * @iter: a tdp_iter instance currently on the SPTE that should be set * @sp: The new TDP page table to install. - * @account_nx: True if this page table is being installed to split a - * non-executable huge page. * @shared: This operation is running under the MMU lock in read mode. * * Returns: 0 if the new page table was installed. Non-0 if the page table * could not be installed (e.g. the atomic compare-exchange failed). */ static int tdp_mmu_link_sp(struct kvm *kvm, struct tdp_iter *iter, - struct kvm_mmu_page *sp, bool account_nx, - bool shared) + struct kvm_mmu_page *sp, bool shared) { u64 spte = make_nonleaf_spte(sp->spt, !kvm_ad_enabled()); int ret = 0; @@ -1138,16 +1141,14 @@ static int tdp_mmu_link_sp(struct kvm *kvm, struct tdp_iter *iter, tdp_mmu_set_spte(kvm, iter, spte); } - spin_lock(&kvm->arch.tdp_mmu_pages_lock); - list_add(&sp->link, &kvm->arch.tdp_mmu_pages); - if (account_nx) - account_huge_nx_page(kvm, sp); - spin_unlock(&kvm->arch.tdp_mmu_pages_lock); tdp_account_mmu_page(kvm, sp); return 0; } +static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, + struct kvm_mmu_page *sp, bool shared); + /* * Handle a TDP page fault (NPT/EPT violation/misconfiguration) by installing * page tables and SPTEs to translate the faulting guest physical address. @@ -1155,9 +1156,10 @@ static int tdp_mmu_link_sp(struct kvm *kvm, struct tdp_iter *iter, int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) { struct kvm_mmu *mmu = vcpu->arch.mmu; + struct kvm *kvm = vcpu->kvm; struct tdp_iter iter; struct kvm_mmu_page *sp; - int ret; + int ret = RET_PF_RETRY; kvm_mmu_hugepage_adjust(vcpu, fault); @@ -1166,6 +1168,8 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) rcu_read_lock(); tdp_mmu_for_each_pte(iter, mmu, fault->gfn, fault->gfn + 1) { + int r; + if (fault->nx_huge_page_workaround_enabled) disallowed_hugepage_adjust(fault, iter.old_spte, iter.level); @@ -1173,57 +1177,52 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) break; /* - * If there is an SPTE mapping a large page at a higher level - * than the target, that SPTE must be cleared and replaced - * with a non-leaf SPTE. + * If SPTE has been frozen by another thread, just give up and + * retry, avoiding unnecessary page table allocation and free. */ - if (is_shadow_present_pte(iter.old_spte) && - is_large_pte(iter.old_spte)) { - if (tdp_mmu_zap_spte_atomic(vcpu->kvm, &iter)) - break; + if (is_removed_spte(iter.old_spte)) + goto retry; - /* - * The iter must explicitly re-read the spte here - * because the new value informs the !present - * path below. - */ - iter.old_spte = kvm_tdp_mmu_read_spte(iter.sptep); - } + /* Step down into the lower level page table if it exists. */ + if (is_shadow_present_pte(iter.old_spte) && + !is_large_pte(iter.old_spte)) + continue; - if (!is_shadow_present_pte(iter.old_spte)) { - bool account_nx = fault->huge_page_disallowed && - fault->req_level >= iter.level; + /* + * The SPTE is either non-present or points to a huge page that + * needs to be split. + */ + sp = tdp_mmu_alloc_sp(vcpu); + tdp_mmu_init_child_sp(sp, &iter); - /* - * If SPTE has been frozen by another thread, just - * give up and retry, avoiding unnecessary page table - * allocation and free. - */ - if (is_removed_spte(iter.old_spte)) - break; + sp->nx_huge_page_disallowed = fault->huge_page_disallowed; - sp = tdp_mmu_alloc_sp(vcpu); - tdp_mmu_init_child_sp(sp, &iter); + if (is_shadow_present_pte(iter.old_spte)) + r = tdp_mmu_split_huge_page(kvm, &iter, sp, true); + else + r = tdp_mmu_link_sp(kvm, &iter, sp, true); - if (tdp_mmu_link_sp(vcpu->kvm, &iter, sp, account_nx, true)) { - tdp_mmu_free_sp(sp); - break; - } + /* + * Also force the guest to retry the access if the upper level SPTEs + * aren't in place. + */ + if (r) { + tdp_mmu_free_sp(sp); + goto retry; } - } - /* - * Force the guest to retry the access if the upper level SPTEs aren't - * in place, or if the target leaf SPTE is frozen by another CPU. - */ - if (iter.level != fault->goal_level || is_removed_spte(iter.old_spte)) { - rcu_read_unlock(); - return RET_PF_RETRY; + if (fault->huge_page_disallowed && + fault->req_level >= iter.level) { + spin_lock(&kvm->arch.tdp_mmu_pages_lock); + track_possible_nx_huge_page(kvm, sp); + spin_unlock(&kvm->arch.tdp_mmu_pages_lock); + } } ret = tdp_mmu_map_handle_target_level(vcpu, fault, &iter); - rcu_read_unlock(); +retry: + rcu_read_unlock(); return ret; } @@ -1472,6 +1471,7 @@ static struct kvm_mmu_page *tdp_mmu_alloc_sp_for_split(struct kvm *kvm, return sp; } +/* Note, the caller is responsible for initializing @sp. */ static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, struct kvm_mmu_page *sp, bool shared) { @@ -1479,8 +1479,6 @@ static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, const int level = iter->level; int ret, i; - tdp_mmu_init_child_sp(sp, iter); - /* * No need for atomics when writing to sp->spt since the page table has * not been linked in yet and thus is not reachable from any other CPU. @@ -1496,7 +1494,7 @@ static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, * correctness standpoint since the translation will be the same either * way. */ - ret = tdp_mmu_link_sp(kvm, iter, sp, false, shared); + ret = tdp_mmu_link_sp(kvm, iter, sp, shared); if (ret) goto out; @@ -1556,6 +1554,8 @@ retry: continue; } + tdp_mmu_init_child_sp(sp, &iter); + if (tdp_mmu_split_huge_page(kvm, &iter, sp, shared)) goto retry; diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h index c163f7cc23ca..d3714200b932 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.h +++ b/arch/x86/kvm/mmu/tdp_mmu.h @@ -5,6 +5,8 @@ #include <linux/kvm_host.h> +#include "spte.h" + hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu); __must_check static inline bool kvm_tdp_mmu_get_root(struct kvm_mmu_page *root) diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c index de1fd7369736..684393c22105 100644 --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -101,10 +101,6 @@ static inline void __kvm_perf_overflow(struct kvm_pmc *pmc, bool in_pmi) struct kvm_pmu *pmu = pmc_to_pmu(pmc); bool skip_pmi = false; - /* Ignore counters that have been reprogrammed already. */ - if (test_and_set_bit(pmc->idx, pmu->reprogram_pmi)) - return; - if (pmc->perf_event && pmc->perf_event->attr.precise_ip) { if (!in_pmi) { /* @@ -122,7 +118,6 @@ static inline void __kvm_perf_overflow(struct kvm_pmc *pmc, bool in_pmi) } else { __set_bit(pmc->idx, (unsigned long *)&pmu->global_status); } - kvm_make_request(KVM_REQ_PMU, pmc->vcpu); if (!pmc->intr || skip_pmi) return; @@ -147,12 +142,22 @@ static void kvm_perf_overflow(struct perf_event *perf_event, { struct kvm_pmc *pmc = perf_event->overflow_handler_context; + /* + * Ignore overflow events for counters that are scheduled to be + * reprogrammed, e.g. if a PMI for the previous event races with KVM's + * handling of a related guest WRMSR. + */ + if (test_and_set_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi)) + return; + __kvm_perf_overflow(pmc, true); + + kvm_make_request(KVM_REQ_PMU, pmc->vcpu); } -static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, - u64 config, bool exclude_user, - bool exclude_kernel, bool intr) +static int pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, u64 config, + bool exclude_user, bool exclude_kernel, + bool intr) { struct kvm_pmu *pmu = pmc_to_pmu(pmc); struct perf_event *event; @@ -204,14 +209,14 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type, if (IS_ERR(event)) { pr_debug_ratelimited("kvm_pmu: event creation failed %ld for pmc->idx = %d\n", PTR_ERR(event), pmc->idx); - return; + return PTR_ERR(event); } pmc->perf_event = event; pmc_to_pmu(pmc)->event_count++; - clear_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi); pmc->is_paused = false; pmc->intr = intr || pebs; + return 0; } static void pmc_pause_counter(struct kvm_pmc *pmc) @@ -245,7 +250,6 @@ static bool pmc_resume_counter(struct kvm_pmc *pmc) perf_event_enable(pmc->perf_event); pmc->is_paused = false; - clear_bit(pmc->idx, (unsigned long *)&pmc_to_pmu(pmc)->reprogram_pmi); return true; } @@ -293,7 +297,7 @@ out: return allow_event; } -void reprogram_counter(struct kvm_pmc *pmc) +static void reprogram_counter(struct kvm_pmc *pmc) { struct kvm_pmu *pmu = pmc_to_pmu(pmc); u64 eventsel = pmc->eventsel; @@ -303,10 +307,13 @@ void reprogram_counter(struct kvm_pmc *pmc) pmc_pause_counter(pmc); if (!pmc_speculative_in_use(pmc) || !pmc_is_enabled(pmc)) - return; + goto reprogram_complete; if (!check_pmu_event_filter(pmc)) - return; + goto reprogram_complete; + + if (pmc->counter < pmc->prev_counter) + __kvm_perf_overflow(pmc, false); if (eventsel & ARCH_PERFMON_EVENTSEL_PIN_CONTROL) printk_once("kvm pmu: pin control bit is ignored\n"); @@ -324,18 +331,29 @@ void reprogram_counter(struct kvm_pmc *pmc) } if (pmc->current_config == new_config && pmc_resume_counter(pmc)) - return; + goto reprogram_complete; pmc_release_perf_event(pmc); pmc->current_config = new_config; - pmc_reprogram_counter(pmc, PERF_TYPE_RAW, - (eventsel & pmu->raw_event_mask), - !(eventsel & ARCH_PERFMON_EVENTSEL_USR), - !(eventsel & ARCH_PERFMON_EVENTSEL_OS), - eventsel & ARCH_PERFMON_EVENTSEL_INT); + + /* + * If reprogramming fails, e.g. due to contention, leave the counter's + * regprogram bit set, i.e. opportunistically try again on the next PMU + * refresh. Don't make a new request as doing so can stall the guest + * if reprogramming repeatedly fails. + */ + if (pmc_reprogram_counter(pmc, PERF_TYPE_RAW, + (eventsel & pmu->raw_event_mask), + !(eventsel & ARCH_PERFMON_EVENTSEL_USR), + !(eventsel & ARCH_PERFMON_EVENTSEL_OS), + eventsel & ARCH_PERFMON_EVENTSEL_INT)) + return; + +reprogram_complete: + clear_bit(pmc->idx, (unsigned long *)&pmc_to_pmu(pmc)->reprogram_pmi); + pmc->prev_counter = 0; } -EXPORT_SYMBOL_GPL(reprogram_counter); void kvm_pmu_handle_event(struct kvm_vcpu *vcpu) { @@ -345,10 +363,11 @@ void kvm_pmu_handle_event(struct kvm_vcpu *vcpu) for_each_set_bit(bit, pmu->reprogram_pmi, X86_PMC_IDX_MAX) { struct kvm_pmc *pmc = static_call(kvm_x86_pmu_pmc_idx_to_pmc)(pmu, bit); - if (unlikely(!pmc || !pmc->perf_event)) { + if (unlikely(!pmc)) { clear_bit(bit, pmu->reprogram_pmi); continue; } + reprogram_counter(pmc); } @@ -522,14 +541,9 @@ void kvm_pmu_destroy(struct kvm_vcpu *vcpu) static void kvm_pmu_incr_counter(struct kvm_pmc *pmc) { - u64 prev_count; - - prev_count = pmc->counter; + pmc->prev_counter = pmc->counter; pmc->counter = (pmc->counter + 1) & pmc_bitmask(pmc); - - reprogram_counter(pmc); - if (pmc->counter < prev_count) - __kvm_perf_overflow(pmc, false); + kvm_pmu_request_counter_reprogam(pmc); } static inline bool eventsel_match_perf_hw_id(struct kvm_pmc *pmc, @@ -542,12 +556,15 @@ static inline bool eventsel_match_perf_hw_id(struct kvm_pmc *pmc, static inline bool cpl_is_matched(struct kvm_pmc *pmc) { bool select_os, select_user; - u64 config = pmc->current_config; + u64 config; if (pmc_is_gp(pmc)) { + config = pmc->eventsel; select_os = config & ARCH_PERFMON_EVENTSEL_OS; select_user = config & ARCH_PERFMON_EVENTSEL_USR; } else { + config = fixed_ctrl_field(pmc_to_pmu(pmc)->fixed_ctr_ctrl, + pmc->idx - INTEL_PMC_IDX_FIXED); select_os = config & 0x1; select_user = config & 0x2; } @@ -577,6 +594,8 @@ EXPORT_SYMBOL_GPL(kvm_pmu_trigger_event); int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp) { struct kvm_pmu_event_filter tmp, *filter; + struct kvm_vcpu *vcpu; + unsigned long i; size_t size; int r; @@ -613,9 +632,18 @@ int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp) mutex_lock(&kvm->lock); filter = rcu_replace_pointer(kvm->arch.pmu_event_filter, filter, mutex_is_locked(&kvm->lock)); + synchronize_srcu_expedited(&kvm->srcu); + + BUILD_BUG_ON(sizeof(((struct kvm_pmu *)0)->reprogram_pmi) > + sizeof(((struct kvm_pmu *)0)->__reprogram_pmi)); + + kvm_for_each_vcpu(i, vcpu, kvm) + atomic64_set(&vcpu_to_pmu(vcpu)->__reprogram_pmi, -1ull); + + kvm_make_all_cpus_request(kvm, KVM_REQ_PMU); + mutex_unlock(&kvm->lock); - synchronize_srcu_expedited(&kvm->srcu); r = 0; cleanup: kfree(filter); diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index 5cc5721f260b..85ff3c0588ba 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -183,7 +183,11 @@ static inline void kvm_init_pmu_capability(void) KVM_PMC_MAX_FIXED); } -void reprogram_counter(struct kvm_pmc *pmc); +static inline void kvm_pmu_request_counter_reprogam(struct kvm_pmc *pmc) +{ + set_bit(pmc->idx, pmc_to_pmu(pmc)->reprogram_pmi); + kvm_make_request(KVM_REQ_PMU, pmc->vcpu); +} void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu); void kvm_pmu_handle_event(struct kvm_vcpu *vcpu); diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h index 4e5b8444f161..042d0aca3c92 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -7,17 +7,30 @@ #include <asm/cpufeatures.h> /* - * Hardware-defined CPUID leafs that are scattered in the kernel, but need to - * be directly used by KVM. Note, these word values conflict with the kernel's - * "bug" caps, but KVM doesn't use those. + * Hardware-defined CPUID leafs that are either scattered by the kernel or are + * unknown to the kernel, but need to be directly used by KVM. Note, these + * word values conflict with the kernel's "bug" caps, but KVM doesn't use those. */ enum kvm_only_cpuid_leafs { CPUID_12_EAX = NCAPINTS, + CPUID_7_1_EDX, NR_KVM_CPU_CAPS, NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS, }; +/* + * Define a KVM-only feature flag. + * + * For features that are scattered by cpufeatures.h, __feature_translate() also + * needs to be updated to translate the kernel-defined feature into the + * KVM-defined feature. + * + * For features that are 100% KVM-only, i.e. not defined by cpufeatures.h, + * forego the intermediate KVM_X86_FEATURE and directly define X86_FEATURE_* so + * that X86_FEATURE_* can be used in KVM. No __feature_translate() handling is + * needed in this case. + */ #define KVM_X86_FEATURE(w, f) ((w)*32 + (f)) /* Intel-defined SGX sub-features, CPUID level 0x12 (EAX). */ @@ -25,6 +38,11 @@ enum kvm_only_cpuid_leafs { #define KVM_X86_FEATURE_SGX2 KVM_X86_FEATURE(CPUID_12_EAX, 1) #define KVM_X86_FEATURE_SGX_EDECCSSA KVM_X86_FEATURE(CPUID_12_EAX, 11) +/* Intel-defined sub-features, CPUID level 0x00000007:1 (EDX) */ +#define X86_FEATURE_AVX_VNNI_INT8 KVM_X86_FEATURE(CPUID_7_1_EDX, 4) +#define X86_FEATURE_AVX_NE_CONVERT KVM_X86_FEATURE(CPUID_7_1_EDX, 5) +#define X86_FEATURE_PREFETCHITI KVM_X86_FEATURE(CPUID_7_1_EDX, 14) + struct cpuid_reg { u32 function; u32 index; @@ -49,6 +67,7 @@ static const struct cpuid_reg reverse_cpuid[] = { [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, [CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX}, [CPUID_8000_001F_EAX] = {0x8000001f, 0, CPUID_EAX}, + [CPUID_7_1_EDX] = { 7, 1, CPUID_EDX}, }; /* diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c new file mode 100644 index 000000000000..a9c1c2af8d94 --- /dev/null +++ b/arch/x86/kvm/smm.c @@ -0,0 +1,649 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <linux/kvm_host.h> +#include "x86.h" +#include "kvm_cache_regs.h" +#include "kvm_emulate.h" +#include "smm.h" +#include "cpuid.h" +#include "trace.h" + +#define CHECK_SMRAM32_OFFSET(field, offset) \ + ASSERT_STRUCT_OFFSET(struct kvm_smram_state_32, field, offset - 0xFE00) + +#define CHECK_SMRAM64_OFFSET(field, offset) \ + ASSERT_STRUCT_OFFSET(struct kvm_smram_state_64, field, offset - 0xFE00) + +static void check_smram_offsets(void) +{ + /* 32 bit SMRAM image */ + CHECK_SMRAM32_OFFSET(reserved1, 0xFE00); + CHECK_SMRAM32_OFFSET(smbase, 0xFEF8); + CHECK_SMRAM32_OFFSET(smm_revision, 0xFEFC); + CHECK_SMRAM32_OFFSET(io_inst_restart, 0xFF00); + CHECK_SMRAM32_OFFSET(auto_hlt_restart, 0xFF02); + CHECK_SMRAM32_OFFSET(io_restart_rdi, 0xFF04); + CHECK_SMRAM32_OFFSET(io_restart_rcx, 0xFF08); + CHECK_SMRAM32_OFFSET(io_restart_rsi, 0xFF0C); + CHECK_SMRAM32_OFFSET(io_restart_rip, 0xFF10); + CHECK_SMRAM32_OFFSET(cr4, 0xFF14); + CHECK_SMRAM32_OFFSET(reserved2, 0xFF18); + CHECK_SMRAM32_OFFSET(int_shadow, 0xFF1A); + CHECK_SMRAM32_OFFSET(reserved3, 0xFF1B); + CHECK_SMRAM32_OFFSET(ds, 0xFF2C); + CHECK_SMRAM32_OFFSET(fs, 0xFF38); + CHECK_SMRAM32_OFFSET(gs, 0xFF44); + CHECK_SMRAM32_OFFSET(idtr, 0xFF50); + CHECK_SMRAM32_OFFSET(tr, 0xFF5C); + CHECK_SMRAM32_OFFSET(gdtr, 0xFF6C); + CHECK_SMRAM32_OFFSET(ldtr, 0xFF78); + CHECK_SMRAM32_OFFSET(es, 0xFF84); + CHECK_SMRAM32_OFFSET(cs, 0xFF90); + CHECK_SMRAM32_OFFSET(ss, 0xFF9C); + CHECK_SMRAM32_OFFSET(es_sel, 0xFFA8); + CHECK_SMRAM32_OFFSET(cs_sel, 0xFFAC); + CHECK_SMRAM32_OFFSET(ss_sel, 0xFFB0); + CHECK_SMRAM32_OFFSET(ds_sel, 0xFFB4); + CHECK_SMRAM32_OFFSET(fs_sel, 0xFFB8); + CHECK_SMRAM32_OFFSET(gs_sel, 0xFFBC); + CHECK_SMRAM32_OFFSET(ldtr_sel, 0xFFC0); + CHECK_SMRAM32_OFFSET(tr_sel, 0xFFC4); + CHECK_SMRAM32_OFFSET(dr7, 0xFFC8); + CHECK_SMRAM32_OFFSET(dr6, 0xFFCC); + CHECK_SMRAM32_OFFSET(gprs, 0xFFD0); + CHECK_SMRAM32_OFFSET(eip, 0xFFF0); + CHECK_SMRAM32_OFFSET(eflags, 0xFFF4); + CHECK_SMRAM32_OFFSET(cr3, 0xFFF8); + CHECK_SMRAM32_OFFSET(cr0, 0xFFFC); + + /* 64 bit SMRAM image */ + CHECK_SMRAM64_OFFSET(es, 0xFE00); + CHECK_SMRAM64_OFFSET(cs, 0xFE10); + CHECK_SMRAM64_OFFSET(ss, 0xFE20); + CHECK_SMRAM64_OFFSET(ds, 0xFE30); + CHECK_SMRAM64_OFFSET(fs, 0xFE40); + CHECK_SMRAM64_OFFSET(gs, 0xFE50); + CHECK_SMRAM64_OFFSET(gdtr, 0xFE60); + CHECK_SMRAM64_OFFSET(ldtr, 0xFE70); + CHECK_SMRAM64_OFFSET(idtr, 0xFE80); + CHECK_SMRAM64_OFFSET(tr, 0xFE90); + CHECK_SMRAM64_OFFSET(io_restart_rip, 0xFEA0); + CHECK_SMRAM64_OFFSET(io_restart_rcx, 0xFEA8); + CHECK_SMRAM64_OFFSET(io_restart_rsi, 0xFEB0); + CHECK_SMRAM64_OFFSET(io_restart_rdi, 0xFEB8); + CHECK_SMRAM64_OFFSET(io_restart_dword, 0xFEC0); + CHECK_SMRAM64_OFFSET(reserved1, 0xFEC4); + CHECK_SMRAM64_OFFSET(io_inst_restart, 0xFEC8); + CHECK_SMRAM64_OFFSET(auto_hlt_restart, 0xFEC9); + CHECK_SMRAM64_OFFSET(amd_nmi_mask, 0xFECA); + CHECK_SMRAM64_OFFSET(int_shadow, 0xFECB); + CHECK_SMRAM64_OFFSET(reserved2, 0xFECC); + CHECK_SMRAM64_OFFSET(efer, 0xFED0); + CHECK_SMRAM64_OFFSET(svm_guest_flag, 0xFED8); + CHECK_SMRAM64_OFFSET(svm_guest_vmcb_gpa, 0xFEE0); + CHECK_SMRAM64_OFFSET(svm_guest_virtual_int, 0xFEE8); + CHECK_SMRAM64_OFFSET(reserved3, 0xFEF0); + CHECK_SMRAM64_OFFSET(smm_revison, 0xFEFC); + CHECK_SMRAM64_OFFSET(smbase, 0xFF00); + CHECK_SMRAM64_OFFSET(reserved4, 0xFF04); + CHECK_SMRAM64_OFFSET(ssp, 0xFF18); + CHECK_SMRAM64_OFFSET(svm_guest_pat, 0xFF20); + CHECK_SMRAM64_OFFSET(svm_host_efer, 0xFF28); + CHECK_SMRAM64_OFFSET(svm_host_cr4, 0xFF30); + CHECK_SMRAM64_OFFSET(svm_host_cr3, 0xFF38); + CHECK_SMRAM64_OFFSET(svm_host_cr0, 0xFF40); + CHECK_SMRAM64_OFFSET(cr4, 0xFF48); + CHECK_SMRAM64_OFFSET(cr3, 0xFF50); + CHECK_SMRAM64_OFFSET(cr0, 0xFF58); + CHECK_SMRAM64_OFFSET(dr7, 0xFF60); + CHECK_SMRAM64_OFFSET(dr6, 0xFF68); + CHECK_SMRAM64_OFFSET(rflags, 0xFF70); + CHECK_SMRAM64_OFFSET(rip, 0xFF78); + CHECK_SMRAM64_OFFSET(gprs, 0xFF80); + + BUILD_BUG_ON(sizeof(union kvm_smram) != 512); +} + +#undef CHECK_SMRAM64_OFFSET +#undef CHECK_SMRAM32_OFFSET + + +void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm) +{ + BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK); + + trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm); + + if (entering_smm) { + vcpu->arch.hflags |= HF_SMM_MASK; + } else { + vcpu->arch.hflags &= ~(HF_SMM_MASK | HF_SMM_INSIDE_NMI_MASK); + + /* Process a latched INIT or SMI, if any. */ + kvm_make_request(KVM_REQ_EVENT, vcpu); + + /* + * Even if KVM_SET_SREGS2 loaded PDPTRs out of band, + * on SMM exit we still need to reload them from + * guest memory + */ + vcpu->arch.pdptrs_from_userspace = false; + } + + kvm_mmu_reset_context(vcpu); +} + +void process_smi(struct kvm_vcpu *vcpu) +{ + vcpu->arch.smi_pending = true; + kvm_make_request(KVM_REQ_EVENT, vcpu); +} + +static u32 enter_smm_get_segment_flags(struct kvm_segment *seg) +{ + u32 flags = 0; + flags |= seg->g << 23; + flags |= seg->db << 22; + flags |= seg->l << 21; + flags |= seg->avl << 20; + flags |= seg->present << 15; + flags |= seg->dpl << 13; + flags |= seg->s << 12; + flags |= seg->type << 8; + return flags; +} + +static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, + struct kvm_smm_seg_state_32 *state, + u32 *selector, int n) +{ + struct kvm_segment seg; + + kvm_get_segment(vcpu, &seg, n); + *selector = seg.selector; + state->base = seg.base; + state->limit = seg.limit; + state->flags = enter_smm_get_segment_flags(&seg); +} + +#ifdef CONFIG_X86_64 +static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, + struct kvm_smm_seg_state_64 *state, + int n) +{ + struct kvm_segment seg; + + kvm_get_segment(vcpu, &seg, n); + state->selector = seg.selector; + state->attributes = enter_smm_get_segment_flags(&seg) >> 8; + state->limit = seg.limit; + state->base = seg.base; +} +#endif + +static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, + struct kvm_smram_state_32 *smram) +{ + struct desc_ptr dt; + unsigned long val; + int i; + + smram->cr0 = kvm_read_cr0(vcpu); + smram->cr3 = kvm_read_cr3(vcpu); + smram->eflags = kvm_get_rflags(vcpu); + smram->eip = kvm_rip_read(vcpu); + + for (i = 0; i < 8; i++) + smram->gprs[i] = kvm_register_read_raw(vcpu, i); + + kvm_get_dr(vcpu, 6, &val); + smram->dr6 = (u32)val; + kvm_get_dr(vcpu, 7, &val); + smram->dr7 = (u32)val; + + enter_smm_save_seg_32(vcpu, &smram->tr, &smram->tr_sel, VCPU_SREG_TR); + enter_smm_save_seg_32(vcpu, &smram->ldtr, &smram->ldtr_sel, VCPU_SREG_LDTR); + + static_call(kvm_x86_get_gdt)(vcpu, &dt); + smram->gdtr.base = dt.address; + smram->gdtr.limit = dt.size; + + static_call(kvm_x86_get_idt)(vcpu, &dt); + smram->idtr.base = dt.address; + smram->idtr.limit = dt.size; + + enter_smm_save_seg_32(vcpu, &smram->es, &smram->es_sel, VCPU_SREG_ES); + enter_smm_save_seg_32(vcpu, &smram->cs, &smram->cs_sel, VCPU_SREG_CS); + enter_smm_save_seg_32(vcpu, &smram->ss, &smram->ss_sel, VCPU_SREG_SS); + + enter_smm_save_seg_32(vcpu, &smram->ds, &smram->ds_sel, VCPU_SREG_DS); + enter_smm_save_seg_32(vcpu, &smram->fs, &smram->fs_sel, VCPU_SREG_FS); + enter_smm_save_seg_32(vcpu, &smram->gs, &smram->gs_sel, VCPU_SREG_GS); + + smram->cr4 = kvm_read_cr4(vcpu); + smram->smm_revision = 0x00020000; + smram->smbase = vcpu->arch.smbase; + + smram->int_shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu); +} + +#ifdef CONFIG_X86_64 +static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, + struct kvm_smram_state_64 *smram) +{ + struct desc_ptr dt; + unsigned long val; + int i; + + for (i = 0; i < 16; i++) + smram->gprs[15 - i] = kvm_register_read_raw(vcpu, i); + + smram->rip = kvm_rip_read(vcpu); + smram->rflags = kvm_get_rflags(vcpu); + + + kvm_get_dr(vcpu, 6, &val); + smram->dr6 = val; + kvm_get_dr(vcpu, 7, &val); + smram->dr7 = val; + + smram->cr0 = kvm_read_cr0(vcpu); + smram->cr3 = kvm_read_cr3(vcpu); + smram->cr4 = kvm_read_cr4(vcpu); + + smram->smbase = vcpu->arch.smbase; + smram->smm_revison = 0x00020064; + + smram->efer = vcpu->arch.efer; + + enter_smm_save_seg_64(vcpu, &smram->tr, VCPU_SREG_TR); + + static_call(kvm_x86_get_idt)(vcpu, &dt); + smram->idtr.limit = dt.size; + smram->idtr.base = dt.address; + + enter_smm_save_seg_64(vcpu, &smram->ldtr, VCPU_SREG_LDTR); + + static_call(kvm_x86_get_gdt)(vcpu, &dt); + smram->gdtr.limit = dt.size; + smram->gdtr.base = dt.address; + + enter_smm_save_seg_64(vcpu, &smram->es, VCPU_SREG_ES); + enter_smm_save_seg_64(vcpu, &smram->cs, VCPU_SREG_CS); + enter_smm_save_seg_64(vcpu, &smram->ss, VCPU_SREG_SS); + enter_smm_save_seg_64(vcpu, &smram->ds, VCPU_SREG_DS); + enter_smm_save_seg_64(vcpu, &smram->fs, VCPU_SREG_FS); + enter_smm_save_seg_64(vcpu, &smram->gs, VCPU_SREG_GS); + + smram->int_shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu); +} +#endif + +void enter_smm(struct kvm_vcpu *vcpu) +{ + struct kvm_segment cs, ds; + struct desc_ptr dt; + unsigned long cr0; + union kvm_smram smram; + + check_smram_offsets(); + + memset(smram.bytes, 0, sizeof(smram.bytes)); + +#ifdef CONFIG_X86_64 + if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) + enter_smm_save_state_64(vcpu, &smram.smram64); + else +#endif + enter_smm_save_state_32(vcpu, &smram.smram32); + + /* + * Give enter_smm() a chance to make ISA-specific changes to the vCPU + * state (e.g. leave guest mode) after we've saved the state into the + * SMM state-save area. + * + * Kill the VM in the unlikely case of failure, because the VM + * can be in undefined state in this case. + */ + if (static_call(kvm_x86_enter_smm)(vcpu, &smram)) + goto error; + + kvm_smm_changed(vcpu, true); + + if (kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, &smram, sizeof(smram))) + goto error; + + if (static_call(kvm_x86_get_nmi_mask)(vcpu)) + vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; + else + static_call(kvm_x86_set_nmi_mask)(vcpu, true); + + kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); + kvm_rip_write(vcpu, 0x8000); + + static_call(kvm_x86_set_interrupt_shadow)(vcpu, 0); + + cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG); + static_call(kvm_x86_set_cr0)(vcpu, cr0); + vcpu->arch.cr0 = cr0; + + static_call(kvm_x86_set_cr4)(vcpu, 0); + + /* Undocumented: IDT limit is set to zero on entry to SMM. */ + dt.address = dt.size = 0; + static_call(kvm_x86_set_idt)(vcpu, &dt); + + if (WARN_ON_ONCE(kvm_set_dr(vcpu, 7, DR7_FIXED_1))) + goto error; + + cs.selector = (vcpu->arch.smbase >> 4) & 0xffff; + cs.base = vcpu->arch.smbase; + + ds.selector = 0; + ds.base = 0; + + cs.limit = ds.limit = 0xffffffff; + cs.type = ds.type = 0x3; + cs.dpl = ds.dpl = 0; + cs.db = ds.db = 0; + cs.s = ds.s = 1; + cs.l = ds.l = 0; + cs.g = ds.g = 1; + cs.avl = ds.avl = 0; + cs.present = ds.present = 1; + cs.unusable = ds.unusable = 0; + cs.padding = ds.padding = 0; + + kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); + kvm_set_segment(vcpu, &ds, VCPU_SREG_DS); + kvm_set_segment(vcpu, &ds, VCPU_SREG_ES); + kvm_set_segment(vcpu, &ds, VCPU_SREG_FS); + kvm_set_segment(vcpu, &ds, VCPU_SREG_GS); + kvm_set_segment(vcpu, &ds, VCPU_SREG_SS); + +#ifdef CONFIG_X86_64 + if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) + if (static_call(kvm_x86_set_efer)(vcpu, 0)) + goto error; +#endif + + kvm_update_cpuid_runtime(vcpu); + kvm_mmu_reset_context(vcpu); + return; +error: + kvm_vm_dead(vcpu->kvm); +} + +static void rsm_set_desc_flags(struct kvm_segment *desc, u32 flags) +{ + desc->g = (flags >> 23) & 1; + desc->db = (flags >> 22) & 1; + desc->l = (flags >> 21) & 1; + desc->avl = (flags >> 20) & 1; + desc->present = (flags >> 15) & 1; + desc->dpl = (flags >> 13) & 3; + desc->s = (flags >> 12) & 1; + desc->type = (flags >> 8) & 15; + + desc->unusable = !desc->present; + desc->padding = 0; +} + +static int rsm_load_seg_32(struct kvm_vcpu *vcpu, + const struct kvm_smm_seg_state_32 *state, + u16 selector, int n) +{ + struct kvm_segment desc; + + desc.selector = selector; + desc.base = state->base; + desc.limit = state->limit; + rsm_set_desc_flags(&desc, state->flags); + kvm_set_segment(vcpu, &desc, n); + return X86EMUL_CONTINUE; +} + +#ifdef CONFIG_X86_64 + +static int rsm_load_seg_64(struct kvm_vcpu *vcpu, + const struct kvm_smm_seg_state_64 *state, + int n) +{ + struct kvm_segment desc; + + desc.selector = state->selector; + rsm_set_desc_flags(&desc, state->attributes << 8); + desc.limit = state->limit; + desc.base = state->base; + kvm_set_segment(vcpu, &desc, n); + return X86EMUL_CONTINUE; +} +#endif + +static int rsm_enter_protected_mode(struct kvm_vcpu *vcpu, + u64 cr0, u64 cr3, u64 cr4) +{ + int bad; + u64 pcid; + + /* In order to later set CR4.PCIDE, CR3[11:0] must be zero. */ + pcid = 0; + if (cr4 & X86_CR4_PCIDE) { + pcid = cr3 & 0xfff; + cr3 &= ~0xfff; + } + + bad = kvm_set_cr3(vcpu, cr3); + if (bad) + return X86EMUL_UNHANDLEABLE; + + /* + * First enable PAE, long mode needs it before CR0.PG = 1 is set. + * Then enable protected mode. However, PCID cannot be enabled + * if EFER.LMA=0, so set it separately. + */ + bad = kvm_set_cr4(vcpu, cr4 & ~X86_CR4_PCIDE); + if (bad) + return X86EMUL_UNHANDLEABLE; + + bad = kvm_set_cr0(vcpu, cr0); + if (bad) + return X86EMUL_UNHANDLEABLE; + + if (cr4 & X86_CR4_PCIDE) { + bad = kvm_set_cr4(vcpu, cr4); + if (bad) + return X86EMUL_UNHANDLEABLE; + if (pcid) { + bad = kvm_set_cr3(vcpu, cr3 | pcid); + if (bad) + return X86EMUL_UNHANDLEABLE; + } + + } + + return X86EMUL_CONTINUE; +} + +static int rsm_load_state_32(struct x86_emulate_ctxt *ctxt, + const struct kvm_smram_state_32 *smstate) +{ + struct kvm_vcpu *vcpu = ctxt->vcpu; + struct desc_ptr dt; + int i, r; + + ctxt->eflags = smstate->eflags | X86_EFLAGS_FIXED; + ctxt->_eip = smstate->eip; + + for (i = 0; i < 8; i++) + *reg_write(ctxt, i) = smstate->gprs[i]; + + if (kvm_set_dr(vcpu, 6, smstate->dr6)) + return X86EMUL_UNHANDLEABLE; + if (kvm_set_dr(vcpu, 7, smstate->dr7)) + return X86EMUL_UNHANDLEABLE; + + rsm_load_seg_32(vcpu, &smstate->tr, smstate->tr_sel, VCPU_SREG_TR); + rsm_load_seg_32(vcpu, &smstate->ldtr, smstate->ldtr_sel, VCPU_SREG_LDTR); + + dt.address = smstate->gdtr.base; + dt.size = smstate->gdtr.limit; + static_call(kvm_x86_set_gdt)(vcpu, &dt); + + dt.address = smstate->idtr.base; + dt.size = smstate->idtr.limit; + static_call(kvm_x86_set_idt)(vcpu, &dt); + + rsm_load_seg_32(vcpu, &smstate->es, smstate->es_sel, VCPU_SREG_ES); + rsm_load_seg_32(vcpu, &smstate->cs, smstate->cs_sel, VCPU_SREG_CS); + rsm_load_seg_32(vcpu, &smstate->ss, smstate->ss_sel, VCPU_SREG_SS); + + rsm_load_seg_32(vcpu, &smstate->ds, smstate->ds_sel, VCPU_SREG_DS); + rsm_load_seg_32(vcpu, &smstate->fs, smstate->fs_sel, VCPU_SREG_FS); + rsm_load_seg_32(vcpu, &smstate->gs, smstate->gs_sel, VCPU_SREG_GS); + + vcpu->arch.smbase = smstate->smbase; + + r = rsm_enter_protected_mode(vcpu, smstate->cr0, + smstate->cr3, smstate->cr4); + + if (r != X86EMUL_CONTINUE) + return r; + + static_call(kvm_x86_set_interrupt_shadow)(vcpu, 0); + ctxt->interruptibility = (u8)smstate->int_shadow; + + return r; +} + +#ifdef CONFIG_X86_64 +static int rsm_load_state_64(struct x86_emulate_ctxt *ctxt, + const struct kvm_smram_state_64 *smstate) +{ + struct kvm_vcpu *vcpu = ctxt->vcpu; + struct desc_ptr dt; + int i, r; + + for (i = 0; i < 16; i++) + *reg_write(ctxt, i) = smstate->gprs[15 - i]; + + ctxt->_eip = smstate->rip; + ctxt->eflags = smstate->rflags | X86_EFLAGS_FIXED; + + if (kvm_set_dr(vcpu, 6, smstate->dr6)) + return X86EMUL_UNHANDLEABLE; + if (kvm_set_dr(vcpu, 7, smstate->dr7)) + return X86EMUL_UNHANDLEABLE; + + vcpu->arch.smbase = smstate->smbase; + + if (kvm_set_msr(vcpu, MSR_EFER, smstate->efer & ~EFER_LMA)) + return X86EMUL_UNHANDLEABLE; + + rsm_load_seg_64(vcpu, &smstate->tr, VCPU_SREG_TR); + + dt.size = smstate->idtr.limit; + dt.address = smstate->idtr.base; + static_call(kvm_x86_set_idt)(vcpu, &dt); + + rsm_load_seg_64(vcpu, &smstate->ldtr, VCPU_SREG_LDTR); + + dt.size = smstate->gdtr.limit; + dt.address = smstate->gdtr.base; + static_call(kvm_x86_set_gdt)(vcpu, &dt); + + r = rsm_enter_protected_mode(vcpu, smstate->cr0, smstate->cr3, smstate->cr4); + if (r != X86EMUL_CONTINUE) + return r; + + rsm_load_seg_64(vcpu, &smstate->es, VCPU_SREG_ES); + rsm_load_seg_64(vcpu, &smstate->cs, VCPU_SREG_CS); + rsm_load_seg_64(vcpu, &smstate->ss, VCPU_SREG_SS); + rsm_load_seg_64(vcpu, &smstate->ds, VCPU_SREG_DS); + rsm_load_seg_64(vcpu, &smstate->fs, VCPU_SREG_FS); + rsm_load_seg_64(vcpu, &smstate->gs, VCPU_SREG_GS); + + static_call(kvm_x86_set_interrupt_shadow)(vcpu, 0); + ctxt->interruptibility = (u8)smstate->int_shadow; + + return X86EMUL_CONTINUE; +} +#endif + +int emulator_leave_smm(struct x86_emulate_ctxt *ctxt) +{ + struct kvm_vcpu *vcpu = ctxt->vcpu; + unsigned long cr0; + union kvm_smram smram; + u64 smbase; + int ret; + + smbase = vcpu->arch.smbase; + + ret = kvm_vcpu_read_guest(vcpu, smbase + 0xfe00, smram.bytes, sizeof(smram)); + if (ret < 0) + return X86EMUL_UNHANDLEABLE; + + if ((vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK) == 0) + static_call(kvm_x86_set_nmi_mask)(vcpu, false); + + kvm_smm_changed(vcpu, false); + + /* + * Get back to real mode, to prepare a safe state in which to load + * CR0/CR3/CR4/EFER. It's all a bit more complicated if the vCPU + * supports long mode. + */ +#ifdef CONFIG_X86_64 + if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) { + struct kvm_segment cs_desc; + unsigned long cr4; + + /* Zero CR4.PCIDE before CR0.PG. */ + cr4 = kvm_read_cr4(vcpu); + if (cr4 & X86_CR4_PCIDE) + kvm_set_cr4(vcpu, cr4 & ~X86_CR4_PCIDE); + + /* A 32-bit code segment is required to clear EFER.LMA. */ + memset(&cs_desc, 0, sizeof(cs_desc)); + cs_desc.type = 0xb; + cs_desc.s = cs_desc.g = cs_desc.present = 1; + kvm_set_segment(vcpu, &cs_desc, VCPU_SREG_CS); + } +#endif + + /* For the 64-bit case, this will clear EFER.LMA. */ + cr0 = kvm_read_cr0(vcpu); + if (cr0 & X86_CR0_PE) + kvm_set_cr0(vcpu, cr0 & ~(X86_CR0_PG | X86_CR0_PE)); + +#ifdef CONFIG_X86_64 + if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) { + unsigned long cr4, efer; + + /* Clear CR4.PAE before clearing EFER.LME. */ + cr4 = kvm_read_cr4(vcpu); + if (cr4 & X86_CR4_PAE) + kvm_set_cr4(vcpu, cr4 & ~X86_CR4_PAE); + + /* And finally go back to 32-bit mode. */ + efer = 0; + kvm_set_msr(vcpu, MSR_EFER, efer); + } +#endif + + /* + * Give leave_smm() a chance to make ISA-specific changes to the vCPU + * state (e.g. enter guest mode) before loading state from the SMM + * state-save area. + */ + if (static_call(kvm_x86_leave_smm)(vcpu, &smram)) + return X86EMUL_UNHANDLEABLE; + +#ifdef CONFIG_X86_64 + if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) + return rsm_load_state_64(ctxt, &smram.smram64); + else +#endif + return rsm_load_state_32(ctxt, &smram.smram32); +} diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h new file mode 100644 index 000000000000..a1cf2ac5bd78 --- /dev/null +++ b/arch/x86/kvm/smm.h @@ -0,0 +1,168 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef ASM_KVM_SMM_H +#define ASM_KVM_SMM_H + +#include <linux/build_bug.h> + +#ifdef CONFIG_KVM_SMM + + +/* + * 32 bit KVM's emulated SMM layout. Based on Intel P6 layout + * (https://www.sandpile.org/x86/smm.htm). + */ + +struct kvm_smm_seg_state_32 { + u32 flags; + u32 limit; + u32 base; +} __packed; + +struct kvm_smram_state_32 { + u32 reserved1[62]; + u32 smbase; + u32 smm_revision; + u16 io_inst_restart; + u16 auto_hlt_restart; + u32 io_restart_rdi; + u32 io_restart_rcx; + u32 io_restart_rsi; + u32 io_restart_rip; + u32 cr4; + + /* A20M#, CPL, shutdown and other reserved/undocumented fields */ + u16 reserved2; + u8 int_shadow; /* KVM extension */ + u8 reserved3[17]; + + struct kvm_smm_seg_state_32 ds; + struct kvm_smm_seg_state_32 fs; + struct kvm_smm_seg_state_32 gs; + struct kvm_smm_seg_state_32 idtr; /* IDTR has only base and limit */ + struct kvm_smm_seg_state_32 tr; + u32 reserved; + struct kvm_smm_seg_state_32 gdtr; /* GDTR has only base and limit */ + struct kvm_smm_seg_state_32 ldtr; + struct kvm_smm_seg_state_32 es; + struct kvm_smm_seg_state_32 cs; + struct kvm_smm_seg_state_32 ss; + + u32 es_sel; + u32 cs_sel; + u32 ss_sel; + u32 ds_sel; + u32 fs_sel; + u32 gs_sel; + u32 ldtr_sel; + u32 tr_sel; + + u32 dr7; + u32 dr6; + u32 gprs[8]; /* GPRS in the "natural" X86 order (EAX/ECX/EDX.../EDI) */ + u32 eip; + u32 eflags; + u32 cr3; + u32 cr0; +} __packed; + + +/* 64 bit KVM's emulated SMM layout. Based on AMD64 layout */ + +struct kvm_smm_seg_state_64 { + u16 selector; + u16 attributes; + u32 limit; + u64 base; +}; + +struct kvm_smram_state_64 { + + struct kvm_smm_seg_state_64 es; + struct kvm_smm_seg_state_64 cs; + struct kvm_smm_seg_state_64 ss; + struct kvm_smm_seg_state_64 ds; + struct kvm_smm_seg_state_64 fs; + struct kvm_smm_seg_state_64 gs; + struct kvm_smm_seg_state_64 gdtr; /* GDTR has only base and limit*/ + struct kvm_smm_seg_state_64 ldtr; + struct kvm_smm_seg_state_64 idtr; /* IDTR has only base and limit*/ + struct kvm_smm_seg_state_64 tr; + + /* I/O restart and auto halt restart are not implemented by KVM */ + u64 io_restart_rip; + u64 io_restart_rcx; + u64 io_restart_rsi; + u64 io_restart_rdi; + u32 io_restart_dword; + u32 reserved1; + u8 io_inst_restart; + u8 auto_hlt_restart; + u8 amd_nmi_mask; /* Documented in AMD BKDG as NMI mask, not used by KVM */ + u8 int_shadow; + u32 reserved2; + + u64 efer; + + /* + * Two fields below are implemented on AMD only, to store + * SVM guest vmcb address if the #SMI was received while in the guest mode. + */ + u64 svm_guest_flag; + u64 svm_guest_vmcb_gpa; + u64 svm_guest_virtual_int; /* unknown purpose, not implemented */ + + u32 reserved3[3]; + u32 smm_revison; + u32 smbase; + u32 reserved4[5]; + + /* ssp and svm_* fields below are not implemented by KVM */ + u64 ssp; + u64 svm_guest_pat; + u64 svm_host_efer; + u64 svm_host_cr4; + u64 svm_host_cr3; + u64 svm_host_cr0; + + u64 cr4; + u64 cr3; + u64 cr0; + u64 dr7; + u64 dr6; + u64 rflags; + u64 rip; + u64 gprs[16]; /* GPRS in a reversed "natural" X86 order (R15/R14/../RCX/RAX.) */ +}; + +union kvm_smram { + struct kvm_smram_state_64 smram64; + struct kvm_smram_state_32 smram32; + u8 bytes[512]; +}; + +static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) +{ + kvm_make_request(KVM_REQ_SMI, vcpu); + return 0; +} + +static inline bool is_smm(struct kvm_vcpu *vcpu) +{ + return vcpu->arch.hflags & HF_SMM_MASK; +} + +void kvm_smm_changed(struct kvm_vcpu *vcpu, bool in_smm); +void enter_smm(struct kvm_vcpu *vcpu); +int emulator_leave_smm(struct x86_emulate_ctxt *ctxt); +void process_smi(struct kvm_vcpu *vcpu); +#else +static inline int kvm_inject_smi(struct kvm_vcpu *vcpu) { return -ENOTTY; } +static inline bool is_smm(struct kvm_vcpu *vcpu) { return false; } + +/* + * emulator_leave_smm is used as a function pointer, so the + * stub is defined in x86.c. + */ +#endif + +#endif diff --git a/arch/x86/kvm/svm/hyperv.c b/arch/x86/kvm/svm/hyperv.c new file mode 100644 index 000000000000..088f6429b24c --- /dev/null +++ b/arch/x86/kvm/svm/hyperv.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AMD SVM specific code for Hyper-V on KVM. + * + * Copyright 2022 Red Hat, Inc. and/or its affiliates. + */ +#include "hyperv.h" + +void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + + svm->vmcb->control.exit_code = HV_SVM_EXITCODE_ENL; + svm->vmcb->control.exit_code_hi = 0; + svm->vmcb->control.exit_info_1 = HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH; + svm->vmcb->control.exit_info_2 = 0; + nested_svm_vmexit(svm); +} diff --git a/arch/x86/kvm/svm/hyperv.h b/arch/x86/kvm/svm/hyperv.h index 7d6d97968fb9..02f4784b5d44 100644 --- a/arch/x86/kvm/svm/hyperv.h +++ b/arch/x86/kvm/svm/hyperv.h @@ -9,27 +9,37 @@ #include <asm/mshyperv.h> #include "../hyperv.h" +#include "svm.h" -/* - * Hyper-V uses the software reserved 32 bytes in VMCB - * control area to expose SVM enlightenments to guests. - */ -struct hv_enlightenments { - struct __packed hv_enlightenments_control { - u32 nested_flush_hypercall:1; - u32 msr_bitmap:1; - u32 enlightened_npt_tlb: 1; - u32 reserved:29; - } __packed hv_enlightenments_control; - u32 hv_vp_id; - u64 hv_vm_id; - u64 partition_assist_page; - u64 reserved; -} __packed; +static inline void nested_svm_hv_update_vm_vp_ids(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + struct hv_vmcb_enlightenments *hve = &svm->nested.ctl.hv_enlightenments; + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); -/* - * Hyper-V uses the software reserved clean bit in VMCB - */ -#define VMCB_HV_NESTED_ENLIGHTENMENTS VMCB_SW + if (!hv_vcpu) + return; + + hv_vcpu->nested.pa_page_gpa = hve->partition_assist_page; + hv_vcpu->nested.vm_id = hve->hv_vm_id; + hv_vcpu->nested.vp_id = hve->hv_vp_id; +} + +static inline bool nested_svm_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + struct hv_vmcb_enlightenments *hve = &svm->nested.ctl.hv_enlightenments; + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + if (!hv_vcpu) + return false; + + if (!hve->hv_enlightenments_control.nested_flush_hypercall) + return false; + + return hv_vcpu->vp_assist_page.nested_control.features.directhypercall; +} + +void svm_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu); #endif /* __ARCH_X86_KVM_SVM_HYPERV_H__ */ diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 995bc0f90759..bc9cd7086fa9 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -25,6 +25,7 @@ #include "trace.h" #include "mmu.h" #include "x86.h" +#include "smm.h" #include "cpuid.h" #include "lapic.h" #include "svm.h" @@ -149,8 +150,12 @@ void recalc_intercepts(struct vcpu_svm *svm) vmcb_clr_intercept(c, INTERCEPT_VINTR); } - /* We don't want to see VMMCALLs from a nested guest */ - vmcb_clr_intercept(c, INTERCEPT_VMMCALL); + /* + * We want to see VMMCALLs from a nested guest only when Hyper-V L2 TLB + * flush feature is enabled. + */ + if (!nested_svm_l2_tlb_flush_enabled(&svm->vcpu)) + vmcb_clr_intercept(c, INTERCEPT_VMMCALL); for (i = 0; i < MAX_INTERCEPT; i++) c->intercepts[i] |= g->intercepts[i]; @@ -179,8 +184,7 @@ void recalc_intercepts(struct vcpu_svm *svm) */ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) { - struct hv_enlightenments *hve = - (struct hv_enlightenments *)svm->nested.ctl.reserved_sw; + struct hv_vmcb_enlightenments *hve = &svm->nested.ctl.hv_enlightenments; int i; /* @@ -194,7 +198,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm) if (!svm->nested.force_msr_bitmap_recalc && kvm_hv_hypercall_enabled(&svm->vcpu) && hve->hv_enlightenments_control.msr_bitmap && - (svm->nested.ctl.clean & BIT(VMCB_HV_NESTED_ENLIGHTENMENTS))) + (svm->nested.ctl.clean & BIT(HV_VMCB_NESTED_ENLIGHTENMENTS))) goto set_msrpm_base_pa; if (!(vmcb12_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT))) @@ -369,8 +373,8 @@ void __nested_copy_vmcb_control_to_cache(struct kvm_vcpu *vcpu, /* Hyper-V extensions (Enlightened VMCB) */ if (kvm_hv_hypercall_enabled(vcpu)) { to->clean = from->clean; - memcpy(to->reserved_sw, from->reserved_sw, - sizeof(struct hv_enlightenments)); + memcpy(&to->hv_enlightenments, &from->hv_enlightenments, + sizeof(to->hv_enlightenments)); } } @@ -474,6 +478,15 @@ static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm, static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu) { /* + * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or + * L2's VP_ID upon request from the guest. Make sure we check for + * pending entries in the right FIFO upon L1/L2 transition as these + * requests are put by other vCPUs asynchronously. + */ + if (to_hv_vcpu(vcpu) && npt_enabled) + kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu); + + /* * TODO: optimize unconditional TLB flush/MMU sync. A partial list of * things to fix before this can be conditional: * @@ -800,6 +813,8 @@ int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa, if (kvm_vcpu_apicv_active(vcpu)) kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu); + nested_svm_hv_update_vm_vp_ids(vcpu); + return 0; } @@ -822,6 +837,13 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu) return 1; } + /* This fails when VP assist page is enabled but the supplied GPA is bogus */ + ret = kvm_hv_verify_vp_assist(vcpu); + if (ret) { + kvm_inject_gp(vcpu, 0); + return ret; + } + vmcb12_gpa = svm->vmcb->save.rax; ret = kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map); if (ret == -EINVAL) { @@ -1383,6 +1405,7 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu) return 0; } +#ifdef CONFIG_KVM_SMM if (vcpu->arch.smi_pending && !svm_smi_blocked(vcpu)) { if (block_nested_events) return -EBUSY; @@ -1391,6 +1414,7 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu) nested_svm_simple_vmexit(svm, SVM_EXIT_SMI); return 0; } +#endif if (vcpu->arch.nmi_pending && !svm_nmi_blocked(vcpu)) { if (block_nested_events) @@ -1417,6 +1441,7 @@ static int svm_check_nested_events(struct kvm_vcpu *vcpu) int nested_svm_exit_special(struct vcpu_svm *svm) { u32 exit_code = svm->vmcb->control.exit_code; + struct kvm_vcpu *vcpu = &svm->vcpu; switch (exit_code) { case SVM_EXIT_INTR: @@ -1435,6 +1460,13 @@ int nested_svm_exit_special(struct vcpu_svm *svm) return NESTED_EXIT_HOST; break; } + case SVM_EXIT_VMMCALL: + /* Hyper-V L2 TLB flush hypercall is handled by L0 */ + if (guest_hv_cpuid_has_l2_tlb_flush(vcpu) && + nested_svm_l2_tlb_flush_enabled(vcpu) && + kvm_hv_is_tlb_flush_hcall(vcpu)) + return NESTED_EXIT_HOST; + break; default: break; } @@ -1485,7 +1517,7 @@ static void nested_copy_vmcb_cache_to_control(struct vmcb_control_area *dst, dst->virt_ext = from->virt_ext; dst->pause_filter_count = from->pause_filter_count; dst->pause_filter_thresh = from->pause_filter_thresh; - /* 'clean' and 'reserved_sw' are not changed by KVM */ + /* 'clean' and 'hv_enlightenments' are not changed by KVM */ } static int svm_get_nested_state(struct kvm_vcpu *vcpu, @@ -1715,6 +1747,9 @@ static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu) return false; } + if (kvm_hv_verify_vp_assist(vcpu)) + return false; + return true; } @@ -1726,4 +1761,5 @@ struct kvm_x86_nested_ops svm_nested_ops = { .get_nested_state_pages = svm_get_nested_state_pages, .get_state = svm_get_nested_state, .set_state = svm_set_nested_state, + .hv_inject_synthetic_vmexit_post_tlb_flush = svm_hv_inject_synthetic_vmexit_post_tlb_flush, }; diff --git a/arch/x86/kvm/svm/pmu.c b/arch/x86/kvm/svm/pmu.c index 9d65cd095691..0e313fbae055 100644 --- a/arch/x86/kvm/svm/pmu.c +++ b/arch/x86/kvm/svm/pmu.c @@ -159,7 +159,7 @@ static int amd_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) data &= ~pmu->reserved_bits; if (data != pmc->eventsel) { pmc->eventsel = data; - reprogram_counter(pmc); + kvm_pmu_request_counter_reprogam(pmc); } return 0; } @@ -212,7 +212,7 @@ static void amd_pmu_reset(struct kvm_vcpu *vcpu) struct kvm_pmc *pmc = &pmu->gp_counters[i]; pmc_stop_counter(pmc); - pmc->counter = pmc->eventsel = 0; + pmc->counter = pmc->prev_counter = pmc->eventsel = 0; } } diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index efaaef2b7ae1..86d6897f4806 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -465,9 +465,9 @@ static void sev_clflush_pages(struct page *pages[], unsigned long npages) return; for (i = 0; i < npages; i++) { - page_virtual = kmap_atomic(pages[i]); + page_virtual = kmap_local_page(pages[i]); clflush_cache_range(page_virtual, PAGE_SIZE); - kunmap_atomic(page_virtual); + kunmap_local(page_virtual); cond_resched(); } } @@ -2648,7 +2648,7 @@ static int setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len) ghcb_scratch_beg = control->ghcb_gpa + offsetof(struct ghcb, shared_buffer); ghcb_scratch_end = control->ghcb_gpa + - offsetof(struct ghcb, reserved_1); + offsetof(struct ghcb, reserved_0xff0); /* * If the scratch area begins within the GHCB, it must be diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index ce362e88a567..9a194aa1a75a 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -6,6 +6,7 @@ #include "mmu.h" #include "kvm_cache_regs.h" #include "x86.h" +#include "smm.h" #include "cpuid.h" #include "pmu.h" @@ -2708,8 +2709,6 @@ static int svm_get_msr_feature(struct kvm_msr_entry *msr) if (cpu_feature_enabled(X86_FEATURE_LFENCE_RDTSC)) msr->data |= MSR_AMD64_DE_CFG_LFENCE_SERIALIZE; break; - case MSR_IA32_PERF_CAPABILITIES: - return 0; default: return KVM_MSR_RET_INVALID; } @@ -3724,6 +3723,13 @@ static void svm_flush_tlb_current(struct kvm_vcpu *vcpu) struct vcpu_svm *svm = to_svm(vcpu); /* + * Unlike VMX, SVM doesn't provide a way to flush only NPT TLB entries. + * A TLB flush for the current ASID flushes both "host" and "guest" TLB + * entries, and thus is a superset of Hyper-V's fine grained flushing. + */ + kvm_hv_vcpu_purge_flush_tlb(vcpu); + + /* * Flush only the current ASID even if the TLB flush was invoked via * kvm_flush_remote_tlbs(). Although flushing remote TLBs requires all * ASIDs to be flushed, KVM uses a single ASID for L1 and L2, and @@ -3889,8 +3895,14 @@ static int svm_vcpu_pre_run(struct kvm_vcpu *vcpu) static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu) { - if (to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR && - to_svm(vcpu)->vmcb->control.exit_info_1) + struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control; + + /* + * Note, the next RIP must be provided as SRCU isn't held, i.e. KVM + * can't read guest memory (dereference memslots) to decode the WRMSR. + */ + if (control->exit_code == SVM_EXIT_MSR && control->exit_info_1 && + nrips && control->next_rip) return handle_fastpath_set_msr_irqoff(vcpu); return EXIT_FASTPATH_NONE; @@ -4102,6 +4114,8 @@ static bool svm_has_emulated_msr(struct kvm *kvm, u32 index) case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC: return false; case MSR_IA32_SMBASE: + if (!IS_ENABLED(CONFIG_KVM_SMM)) + return false; /* SEV-ES guests do not support SMM, so report false */ if (kvm && sev_es_guest(kvm)) return false; @@ -4358,6 +4372,7 @@ static void svm_setup_mce(struct kvm_vcpu *vcpu) vcpu->arch.mcg_cap &= 0x1ff; } +#ifdef CONFIG_KVM_SMM bool svm_smi_blocked(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); @@ -4385,7 +4400,7 @@ static int svm_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection) return 1; } -static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate) +static int svm_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram) { struct vcpu_svm *svm = to_svm(vcpu); struct kvm_host_map map_save; @@ -4394,10 +4409,16 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate) if (!is_guest_mode(vcpu)) return 0; - /* FED8h - SVM Guest */ - put_smstate(u64, smstate, 0x7ed8, 1); - /* FEE0h - SVM Guest VMCB Physical Address */ - put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb12_gpa); + /* + * 32-bit SMRAM format doesn't preserve EFER and SVM state. Userspace is + * responsible for ensuring nested SVM and SMIs are mutually exclusive. + */ + + if (!guest_cpuid_has(vcpu, X86_FEATURE_LM)) + return 1; + + smram->smram64.svm_guest_flag = 1; + smram->smram64.svm_guest_vmcb_gpa = svm->nested.vmcb12_gpa; svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX]; svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP]; @@ -4419,8 +4440,7 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate) * that, see svm_prepare_switch_to_guest()) which must be * preserved. */ - if (kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.hsave_msr), - &map_save) == -EINVAL) + if (kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.hsave_msr), &map_save)) return 1; BUILD_BUG_ON(offsetof(struct vmcb, save) != 0x400); @@ -4432,34 +4452,33 @@ static int svm_enter_smm(struct kvm_vcpu *vcpu, char *smstate) return 0; } -static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) +static int svm_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram) { struct vcpu_svm *svm = to_svm(vcpu); struct kvm_host_map map, map_save; - u64 saved_efer, vmcb12_gpa; struct vmcb *vmcb12; int ret; + const struct kvm_smram_state_64 *smram64 = &smram->smram64; + if (!guest_cpuid_has(vcpu, X86_FEATURE_LM)) return 0; /* Non-zero if SMI arrived while vCPU was in guest mode. */ - if (!GET_SMSTATE(u64, smstate, 0x7ed8)) + if (!smram64->svm_guest_flag) return 0; if (!guest_cpuid_has(vcpu, X86_FEATURE_SVM)) return 1; - saved_efer = GET_SMSTATE(u64, smstate, 0x7ed0); - if (!(saved_efer & EFER_SVME)) + if (!(smram64->efer & EFER_SVME)) return 1; - vmcb12_gpa = GET_SMSTATE(u64, smstate, 0x7ee0); - if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcb12_gpa), &map) == -EINVAL) + if (kvm_vcpu_map(vcpu, gpa_to_gfn(smram64->svm_guest_vmcb_gpa), &map)) return 1; ret = 1; - if (kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.hsave_msr), &map_save) == -EINVAL) + if (kvm_vcpu_map(vcpu, gpa_to_gfn(svm->nested.hsave_msr), &map_save)) goto unmap_map; if (svm_allocate_nested(svm)) @@ -4481,7 +4500,7 @@ static int svm_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) vmcb12 = map.hva; nested_copy_vmcb_control_to_cache(svm, &vmcb12->control); nested_copy_vmcb_save_to_cache(svm, &vmcb12->save); - ret = enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12, false); + ret = enter_svm_guest_mode(vcpu, smram64->svm_guest_vmcb_gpa, vmcb12, false); if (ret) goto unmap_save; @@ -4507,6 +4526,7 @@ static void svm_enable_smi_window(struct kvm_vcpu *vcpu) /* We must be in SMM; RSM will cause a vmexit anyway. */ } } +#endif static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type, void *insn, int insn_len) @@ -4782,10 +4802,12 @@ static struct kvm_x86_ops svm_x86_ops __initdata = { .pi_update_irte = avic_pi_update_irte, .setup_mce = svm_setup_mce, +#ifdef CONFIG_KVM_SMM .smi_allowed = svm_smi_allowed, .enter_smm = svm_enter_smm, .leave_smm = svm_leave_smm, .enable_smi_window = svm_enable_smi_window, +#endif .mem_enc_ioctl = sev_mem_enc_ioctl, .mem_enc_register_region = sev_mem_enc_register_region, @@ -4851,6 +4873,7 @@ static __init void svm_set_cpu_caps(void) { kvm_set_cpu_caps(); + kvm_caps.supported_perf_cap = 0; kvm_caps.supported_xss = 0; /* CPUID 0x80000001 and 0x8000000A (SVM features) */ diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 199a2ecef1ce..4826e6cc611b 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -151,7 +151,10 @@ struct vmcb_ctrl_area_cached { u64 nested_cr3; u64 virt_ext; u32 clean; - u8 reserved_sw[32]; + union { + struct hv_vmcb_enlightenments hv_enlightenments; + u8 reserved_sw[32]; + }; }; struct svm_nested_state { diff --git a/arch/x86/kvm/svm/svm_onhyperv.c b/arch/x86/kvm/svm/svm_onhyperv.c index 8cdc62c74a96..26a89d0da93e 100644 --- a/arch/x86/kvm/svm/svm_onhyperv.c +++ b/arch/x86/kvm/svm/svm_onhyperv.c @@ -14,9 +14,9 @@ #include "kvm_onhyperv.h" #include "svm_onhyperv.h" -int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu) +int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu) { - struct hv_enlightenments *hve; + struct hv_vmcb_enlightenments *hve; struct hv_partition_assist_pg **p_hv_pa_pg = &to_kvm_hv(vcpu->kvm)->hv_pa_pg; @@ -26,13 +26,13 @@ int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu) if (!*p_hv_pa_pg) return -ENOMEM; - hve = (struct hv_enlightenments *)to_svm(vcpu)->vmcb->control.reserved_sw; + hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments; hve->partition_assist_page = __pa(*p_hv_pa_pg); hve->hv_vm_id = (unsigned long)vcpu->kvm; if (!hve->hv_enlightenments_control.nested_flush_hypercall) { hve->hv_enlightenments_control.nested_flush_hypercall = 1; - vmcb_mark_dirty(to_svm(vcpu)->vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); + vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); } return 0; diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h index e2fc59380465..45faf84476ce 100644 --- a/arch/x86/kvm/svm/svm_onhyperv.h +++ b/arch/x86/kvm/svm/svm_onhyperv.h @@ -13,12 +13,14 @@ static struct kvm_x86_ops svm_x86_ops; -int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu); +int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu); static inline void svm_hv_init_vmcb(struct vmcb *vmcb) { - struct hv_enlightenments *hve = - (struct hv_enlightenments *)vmcb->control.reserved_sw; + struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; + + BUILD_BUG_ON(sizeof(vmcb->control.hv_enlightenments) != + sizeof(vmcb->control.reserved_sw)); if (npt_enabled && ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) @@ -51,8 +53,8 @@ static inline void svm_hv_hardware_setup(void) vp_ap->nested_control.features.directhypercall = 1; } - svm_x86_ops.enable_direct_tlbflush = - svm_hv_enable_direct_tlbflush; + svm_x86_ops.enable_l2_tlb_flush = + svm_hv_enable_l2_tlb_flush; } } @@ -60,23 +62,20 @@ static inline void svm_hv_vmcb_dirty_nested_enlightenments( struct kvm_vcpu *vcpu) { struct vmcb *vmcb = to_svm(vcpu)->vmcb; - struct hv_enlightenments *hve = - (struct hv_enlightenments *)vmcb->control.reserved_sw; + struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; if (hve->hv_enlightenments_control.msr_bitmap) - vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); + vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); } -static inline void svm_hv_update_vp_id(struct vmcb *vmcb, - struct kvm_vcpu *vcpu) +static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu) { - struct hv_enlightenments *hve = - (struct hv_enlightenments *)vmcb->control.reserved_sw; + struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; u32 vp_index = kvm_hv_get_vpindex(vcpu); if (hve->hv_vp_id != vp_index) { hve->hv_vp_id = vp_index; - vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS); + vmcb_mark_dirty(vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS); } } #else diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h index bc25589ad588..83843379813e 100644 --- a/arch/x86/kvm/trace.h +++ b/arch/x86/kvm/trace.h @@ -113,12 +113,13 @@ TRACE_EVENT(kvm_hv_hypercall_done, * Tracepoint for Xen hypercall. */ TRACE_EVENT(kvm_xen_hypercall, - TP_PROTO(unsigned long nr, unsigned long a0, unsigned long a1, - unsigned long a2, unsigned long a3, unsigned long a4, - unsigned long a5), - TP_ARGS(nr, a0, a1, a2, a3, a4, a5), + TP_PROTO(u8 cpl, unsigned long nr, + unsigned long a0, unsigned long a1, unsigned long a2, + unsigned long a3, unsigned long a4, unsigned long a5), + TP_ARGS(cpl, nr, a0, a1, a2, a3, a4, a5), TP_STRUCT__entry( + __field(u8, cpl) __field(unsigned long, nr) __field(unsigned long, a0) __field(unsigned long, a1) @@ -129,6 +130,7 @@ TRACE_EVENT(kvm_xen_hypercall, ), TP_fast_assign( + __entry->cpl = cpl; __entry->nr = nr; __entry->a0 = a0; __entry->a1 = a1; @@ -138,8 +140,9 @@ TRACE_EVENT(kvm_xen_hypercall, __entry->a4 = a5; ), - TP_printk("nr 0x%lx a0 0x%lx a1 0x%lx a2 0x%lx a3 0x%lx a4 0x%lx a5 %lx", - __entry->nr, __entry->a0, __entry->a1, __entry->a2, + TP_printk("cpl %d nr 0x%lx a0 0x%lx a1 0x%lx a2 0x%lx a3 0x%lx a4 0x%lx a5 %lx", + __entry->cpl, __entry->nr, + __entry->a0, __entry->a1, __entry->a2, __entry->a3, __entry->a4, __entry->a5) ); @@ -1547,38 +1550,41 @@ TRACE_EVENT(kvm_hv_timer_state, * Tracepoint for kvm_hv_flush_tlb. */ TRACE_EVENT(kvm_hv_flush_tlb, - TP_PROTO(u64 processor_mask, u64 address_space, u64 flags), - TP_ARGS(processor_mask, address_space, flags), + TP_PROTO(u64 processor_mask, u64 address_space, u64 flags, bool guest_mode), + TP_ARGS(processor_mask, address_space, flags, guest_mode), TP_STRUCT__entry( __field(u64, processor_mask) __field(u64, address_space) __field(u64, flags) + __field(bool, guest_mode) ), TP_fast_assign( __entry->processor_mask = processor_mask; __entry->address_space = address_space; __entry->flags = flags; + __entry->guest_mode = guest_mode; ), - TP_printk("processor_mask 0x%llx address_space 0x%llx flags 0x%llx", + TP_printk("processor_mask 0x%llx address_space 0x%llx flags 0x%llx %s", __entry->processor_mask, __entry->address_space, - __entry->flags) + __entry->flags, __entry->guest_mode ? "(L2)" : "") ); /* * Tracepoint for kvm_hv_flush_tlb_ex. */ TRACE_EVENT(kvm_hv_flush_tlb_ex, - TP_PROTO(u64 valid_bank_mask, u64 format, u64 address_space, u64 flags), - TP_ARGS(valid_bank_mask, format, address_space, flags), + TP_PROTO(u64 valid_bank_mask, u64 format, u64 address_space, u64 flags, bool guest_mode), + TP_ARGS(valid_bank_mask, format, address_space, flags, guest_mode), TP_STRUCT__entry( __field(u64, valid_bank_mask) __field(u64, format) __field(u64, address_space) __field(u64, flags) + __field(bool, guest_mode) ), TP_fast_assign( @@ -1586,12 +1592,14 @@ TRACE_EVENT(kvm_hv_flush_tlb_ex, __entry->format = format; __entry->address_space = address_space; __entry->flags = flags; + __entry->guest_mode = guest_mode; ), TP_printk("valid_bank_mask 0x%llx format 0x%llx " - "address_space 0x%llx flags 0x%llx", + "address_space 0x%llx flags 0x%llx %s", __entry->valid_bank_mask, __entry->format, - __entry->address_space, __entry->flags) + __entry->address_space, __entry->flags, + __entry->guest_mode ? "(L2)" : "") ); /* diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h index 07254314f3dd..cd2ac9536c99 100644 --- a/arch/x86/kvm/vmx/capabilities.h +++ b/arch/x86/kvm/vmx/capabilities.h @@ -395,30 +395,6 @@ static inline bool vmx_pebs_supported(void) return boot_cpu_has(X86_FEATURE_PEBS) && kvm_pmu_cap.pebs_ept; } -static inline u64 vmx_get_perf_capabilities(void) -{ - u64 perf_cap = PMU_CAP_FW_WRITES; - struct x86_pmu_lbr lbr; - u64 host_perf_cap = 0; - - if (!enable_pmu) - return 0; - - if (boot_cpu_has(X86_FEATURE_PDCM)) - rdmsrl(MSR_IA32_PERF_CAPABILITIES, host_perf_cap); - - if (x86_perf_get_lbr(&lbr) >= 0 && lbr.nr) - perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT; - - if (vmx_pebs_supported()) { - perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK; - if ((perf_cap & PERF_CAP_PEBS_FORMAT) < 4) - perf_cap &= ~PERF_CAP_PEBS_BASELINE; - } - - return perf_cap; -} - static inline bool cpu_has_notify_vmexit(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & diff --git a/arch/x86/kvm/vmx/evmcs.c b/arch/x86/kvm/vmx/hyperv.c index d8b23c96d627..ae03d1fe0355 100644 --- a/arch/x86/kvm/vmx/evmcs.c +++ b/arch/x86/kvm/vmx/hyperv.c @@ -3,9 +3,9 @@ #include <linux/errno.h> #include <linux/smp.h> -#include "../hyperv.h" #include "../cpuid.h" -#include "evmcs.h" +#include "hyperv.h" +#include "nested.h" #include "vmcs.h" #include "vmx.h" #include "trace.h" @@ -322,24 +322,17 @@ const struct evmcs_field vmcs_field_to_evmcs_1[] = { }; const unsigned int nr_evmcs_1_fields = ARRAY_SIZE(vmcs_field_to_evmcs_1); -bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa) +u64 nested_get_evmptr(struct kvm_vcpu *vcpu) { - struct hv_vp_assist_page assist_page; - - *evmcs_gpa = -1ull; - - if (unlikely(!kvm_hv_get_assist_page(vcpu, &assist_page))) - return false; - - if (unlikely(!assist_page.enlighten_vmentry)) - return false; + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); - if (unlikely(!evmptr_is_valid(assist_page.current_nested_vmcs))) - return false; + if (unlikely(kvm_hv_get_assist_page(vcpu))) + return EVMPTR_INVALID; - *evmcs_gpa = assist_page.current_nested_vmcs; + if (unlikely(!hv_vcpu->vp_assist_page.enlighten_vmentry)) + return EVMPTR_INVALID; - return true; + return hv_vcpu->vp_assist_page.current_nested_vmcs; } uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu) @@ -507,3 +500,23 @@ int nested_enable_evmcs(struct kvm_vcpu *vcpu, return 0; } + +bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + struct vcpu_vmx *vmx = to_vmx(vcpu); + struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs; + + if (!hv_vcpu || !evmcs) + return false; + + if (!evmcs->hv_enlightenments_control.nested_flush_hypercall) + return false; + + return hv_vcpu->vp_assist_page.nested_control.features.directhypercall; +} + +void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu) +{ + nested_vmx_vmexit(vcpu, HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH, 0, 0); +} diff --git a/arch/x86/kvm/vmx/evmcs.h b/arch/x86/kvm/vmx/hyperv.h index 6f746ef3c038..571e7929d14e 100644 --- a/arch/x86/kvm/vmx/evmcs.h +++ b/arch/x86/kvm/vmx/hyperv.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0 */ -#ifndef __KVM_X86_VMX_EVMCS_H -#define __KVM_X86_VMX_EVMCS_H +#ifndef __KVM_X86_VMX_HYPERV_H +#define __KVM_X86_VMX_HYPERV_H #include <linux/jump_label.h> @@ -8,6 +8,8 @@ #include <asm/mshyperv.h> #include <asm/vmx.h> +#include "../hyperv.h" + #include "capabilities.h" #include "vmcs.h" #include "vmcs12.h" @@ -235,11 +237,13 @@ enum nested_evmptrld_status { EVMPTRLD_ERROR, }; -bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa); +u64 nested_get_evmptr(struct kvm_vcpu *vcpu); uint16_t nested_get_evmcs_version(struct kvm_vcpu *vcpu); int nested_enable_evmcs(struct kvm_vcpu *vcpu, uint16_t *vmcs_version); void nested_evmcs_filter_control_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata); int nested_evmcs_check_controls(struct vmcs12 *vmcs12); +bool nested_evmcs_l2_tlb_flush_enabled(struct kvm_vcpu *vcpu); +void vmx_hv_inject_synthetic_vmexit_post_tlb_flush(struct kvm_vcpu *vcpu); -#endif /* __KVM_X86_VMX_EVMCS_H */ +#endif /* __KVM_X86_VMX_HYPERV_H */ diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 5b0d4859e4b7..b6f4411b613e 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -7,7 +7,6 @@ #include <asm/mmu_context.h> #include "cpuid.h" -#include "evmcs.h" #include "hyperv.h" #include "mmu.h" #include "nested.h" @@ -16,6 +15,7 @@ #include "trace.h" #include "vmx.h" #include "x86.h" +#include "smm.h" static bool __read_mostly enable_shadow_vmcs = 1; module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO); @@ -225,6 +225,7 @@ static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx) static inline void nested_release_evmcs(struct kvm_vcpu *vcpu) { + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); struct vcpu_vmx *vmx = to_vmx(vcpu); if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) { @@ -233,6 +234,12 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu) } vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID; + + if (hv_vcpu) { + hv_vcpu->nested.pa_page_gpa = INVALID_GPA; + hv_vcpu->nested.vm_id = 0; + hv_vcpu->nested.vp_id = 0; + } } static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx, @@ -1126,6 +1133,15 @@ static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu, struct vcpu_vmx *vmx = to_vmx(vcpu); /* + * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or + * L2's VP_ID upon request from the guest. Make sure we check for + * pending entries in the right FIFO upon L1/L2 transition as these + * requests are put by other vCPUs asynchronously. + */ + if (to_hv_vcpu(vcpu) && enable_ept) + kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu); + + /* * If vmcs12 doesn't use VPID, L1 expects linear and combined mappings * for *all* contexts to be flushed on VM-Enter/VM-Exit, i.e. it's a * full TLB flush from the guest's perspective. This is required even @@ -1557,12 +1573,20 @@ static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields { struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12; struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs; + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(&vmx->vcpu); /* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */ vmcs12->tpr_threshold = evmcs->tpr_threshold; vmcs12->guest_rip = evmcs->guest_rip; if (unlikely(!(hv_clean_fields & + HV_VMX_ENLIGHTENED_CLEAN_FIELD_ENLIGHTENMENTSCONTROL))) { + hv_vcpu->nested.pa_page_gpa = evmcs->partition_assist_page; + hv_vcpu->nested.vm_id = evmcs->hv_vm_id; + hv_vcpu->nested.vp_id = evmcs->hv_vp_id; + } + + if (unlikely(!(hv_clean_fields & HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC))) { vmcs12->guest_rsp = evmcs->guest_rsp; vmcs12->guest_rflags = evmcs->guest_rflags; @@ -1977,7 +2001,8 @@ static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld( if (likely(!guest_cpuid_has_evmcs(vcpu))) return EVMPTRLD_DISABLED; - if (!nested_enlightened_vmentry(vcpu, &evmcs_gpa)) { + evmcs_gpa = nested_get_evmptr(vcpu); + if (!evmptr_is_valid(evmcs_gpa)) { nested_release_evmcs(vcpu); return EVMPTRLD_DISABLED; } @@ -2563,12 +2588,9 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, nested_ept_init_mmu_context(vcpu); /* - * This sets GUEST_CR0 to vmcs12->guest_cr0, possibly modifying those - * bits which we consider mandatory enabled. - * The CR0_READ_SHADOW is what L2 should have expected to read given - * the specifications by L1; It's not enough to take - * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we - * have more bits than L1 expected. + * Override the CR0/CR4 read shadows after setting the effective guest + * CR0/CR4. The common helpers also set the shadows, but they don't + * account for vmcs12's cr0/4_guest_host_mask. */ vmx_set_cr0(vcpu, vmcs12->guest_cr0); vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12)); @@ -3251,6 +3273,12 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu) static bool vmx_get_nested_state_pages(struct kvm_vcpu *vcpu) { + /* + * Note: nested_get_evmcs_page() also updates 'vp_assist_page' copy + * in 'struct kvm_vcpu_hv' in case eVMCS is in use, this is mandatory + * to make nested_evmcs_l2_tlb_flush_enabled() work correctly post + * migration. + */ if (!nested_get_evmcs_page(vcpu)) { pr_debug_ratelimited("%s: enlightened vmptrld failed\n", __func__); @@ -4767,6 +4795,17 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason, vmx_switch_vmcs(vcpu, &vmx->vmcs01); + /* + * If IBRS is advertised to the vCPU, KVM must flush the indirect + * branch predictors when transitioning from L2 to L1, as L1 expects + * hardware (KVM in this case) to provide separate predictor modes. + * Bare metal isolates VMX root (host) from VMX non-root (guest), but + * doesn't isolate different VMCSs, i.e. in this case, doesn't provide + * separate modes for L2 vs L1. + */ + if (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL)) + indirect_branch_prediction_barrier(); + /* Update any VMCS fields that might have changed while L2 ran */ vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr); vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr); @@ -5100,24 +5139,35 @@ static int handle_vmxon(struct kvm_vcpu *vcpu) | FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX; /* - * Note, KVM cannot rely on hardware to perform the CR0/CR4 #UD checks - * that have higher priority than VM-Exit (see Intel SDM's pseudocode - * for VMXON), as KVM must load valid CR0/CR4 values into hardware while - * running the guest, i.e. KVM needs to check the _guest_ values. + * Manually check CR4.VMXE checks, KVM must force CR4.VMXE=1 to enter + * the guest and so cannot rely on hardware to perform the check, + * which has higher priority than VM-Exit (see Intel SDM's pseudocode + * for VMXON). * - * Rely on hardware for the other two pre-VM-Exit checks, !VM86 and - * !COMPATIBILITY modes. KVM may run the guest in VM86 to emulate Real - * Mode, but KVM will never take the guest out of those modes. + * Rely on hardware for the other pre-VM-Exit checks, CR0.PE=1, !VM86 + * and !COMPATIBILITY modes. For an unrestricted guest, KVM doesn't + * force any of the relevant guest state. For a restricted guest, KVM + * does force CR0.PE=1, but only to also force VM86 in order to emulate + * Real Mode, and so there's no need to check CR0.PE manually. */ - if (!nested_host_cr0_valid(vcpu, kvm_read_cr0(vcpu)) || - !nested_host_cr4_valid(vcpu, kvm_read_cr4(vcpu))) { + if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE)) { kvm_queue_exception(vcpu, UD_VECTOR); return 1; } /* - * CPL=0 and all other checks that are lower priority than VM-Exit must - * be checked manually. + * The CPL is checked for "not in VMX operation" and for "in VMX root", + * and has higher priority than the VM-Fail due to being post-VMXON, + * i.e. VMXON #GPs outside of VMX non-root if CPL!=0. In VMX non-root, + * VMXON causes VM-Exit and KVM unconditionally forwards VMXON VM-Exits + * from L2 to L1, i.e. there's no need to check for the vCPU being in + * VMX non-root. + * + * Forwarding the VM-Exit unconditionally, i.e. without performing the + * #UD checks (see above), is functionally ok because KVM doesn't allow + * L1 to run L2 without CR4.VMXE=0, and because KVM never modifies L2's + * CR0 or CR4, i.e. it's L2's responsibility to emulate #UDs that are + * missed by hardware due to shadowing CR0 and/or CR4. */ if (vmx_get_cpl(vcpu)) { kvm_inject_gp(vcpu, 0); @@ -5127,6 +5177,17 @@ static int handle_vmxon(struct kvm_vcpu *vcpu) if (vmx->nested.vmxon) return nested_vmx_fail(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION); + /* + * Invalid CR0/CR4 generates #GP. These checks are performed if and + * only if the vCPU isn't already in VMX operation, i.e. effectively + * have lower priority than the VM-Fail above. + */ + if (!nested_host_cr0_valid(vcpu, kvm_read_cr0(vcpu)) || + !nested_host_cr4_valid(vcpu, kvm_read_cr4(vcpu))) { + kvm_inject_gp(vcpu, 0); + return 1; + } + if ((vmx->msr_ia32_feature_control & VMXON_NEEDED_FEATURES) != VMXON_NEEDED_FEATURES) { kvm_inject_gp(vcpu, 0); @@ -5206,7 +5267,6 @@ static int handle_vmclear(struct kvm_vcpu *vcpu) struct vcpu_vmx *vmx = to_vmx(vcpu); u32 zero = 0; gpa_t vmptr; - u64 evmcs_gpa; int r; if (!nested_vmx_check_permission(vcpu)) @@ -5232,7 +5292,7 @@ static int handle_vmclear(struct kvm_vcpu *vcpu) * vmx->nested.hv_evmcs but this shouldn't be a problem. */ if (likely(!guest_cpuid_has_evmcs(vcpu) || - !nested_enlightened_vmentry(vcpu, &evmcs_gpa))) { + !evmptr_is_valid(nested_get_evmptr(vcpu)))) { if (vmptr == vmx->nested.current_vmptr) nested_release_vmcs12(vcpu); @@ -6129,6 +6189,11 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu, * Handle L2's bus locks in L0 directly. */ return true; + case EXIT_REASON_VMCALL: + /* Hyper-V L2 TLB flush hypercall is handled by L0 */ + return guest_hv_cpuid_has_l2_tlb_flush(vcpu) && + nested_evmcs_l2_tlb_flush_enabled(vcpu) && + kvm_hv_is_tlb_flush_hcall(vcpu); default: break; } @@ -6980,4 +7045,5 @@ struct kvm_x86_nested_ops vmx_nested_ops = { .write_log_dirty = nested_vmx_write_pml_buffer, .enable_evmcs = nested_enable_evmcs, .get_evmcs_version = nested_get_evmcs_version, + .hv_inject_synthetic_vmexit_post_tlb_flush = vmx_hv_inject_synthetic_vmexit_post_tlb_flush, }; diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h index 6312c9541c3c..96952263b029 100644 --- a/arch/x86/kvm/vmx/nested.h +++ b/arch/x86/kvm/vmx/nested.h @@ -79,9 +79,10 @@ static inline bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu) } /* - * Return the cr0 value that a nested guest would read. This is a combination - * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by - * its hypervisor (cr0_read_shadow). + * Return the cr0/4 value that a nested guest would read. This is a combination + * of L1's "real" cr0 used to run the guest (guest_cr0), and the bits shadowed + * by the L1 hypervisor (cr0_read_shadow). KVM must emulate CPU behavior as + * the value+mask loaded into vmcs02 may not match the vmcs12 fields. */ static inline unsigned long nested_read_cr0(struct vmcs12 *fields) { diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index 10b33da9bd05..e5cec07ca8d9 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -52,7 +52,7 @@ static void reprogram_fixed_counters(struct kvm_pmu *pmu, u64 data) pmc = get_fixed_pmc(pmu, MSR_CORE_PERF_FIXED_CTR0 + i); __set_bit(INTEL_PMC_IDX_FIXED + i, pmu->pmc_in_use); - reprogram_counter(pmc); + kvm_pmu_request_counter_reprogam(pmc); } } @@ -76,7 +76,7 @@ static void reprogram_counters(struct kvm_pmu *pmu, u64 diff) for_each_set_bit(bit, (unsigned long *)&diff, X86_PMC_IDX_MAX) { pmc = intel_pmc_idx_to_pmc(pmu, bit); if (pmc) - reprogram_counter(pmc); + kvm_pmu_request_counter_reprogam(pmc); } } @@ -477,7 +477,7 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) reserved_bits ^= HSW_IN_TX_CHECKPOINTED; if (!(data & reserved_bits)) { pmc->eventsel = data; - reprogram_counter(pmc); + kvm_pmu_request_counter_reprogam(pmc); return 0; } } else if (intel_pmu_handle_lbr_msrs_access(vcpu, msr_info, false)) @@ -631,7 +631,6 @@ static void intel_pmu_init(struct kvm_vcpu *vcpu) pmu->fixed_counters[i].current_config = 0; } - vcpu->arch.perf_capabilities = vmx_get_perf_capabilities(); lbr_desc->records.nr = 0; lbr_desc->event = NULL; lbr_desc->msr_passthrough = false; @@ -647,14 +646,14 @@ static void intel_pmu_reset(struct kvm_vcpu *vcpu) pmc = &pmu->gp_counters[i]; pmc_stop_counter(pmc); - pmc->counter = pmc->eventsel = 0; + pmc->counter = pmc->prev_counter = pmc->eventsel = 0; } for (i = 0; i < KVM_PMC_MAX_FIXED; i++) { pmc = &pmu->fixed_counters[i]; pmc_stop_counter(pmc); - pmc->counter = 0; + pmc->counter = pmc->prev_counter = 0; } pmu->fixed_ctr_ctrl = pmu->global_ctrl = pmu->global_status = 0; diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c index 8f95c7c01433..b12da2a6dec9 100644 --- a/arch/x86/kvm/vmx/sgx.c +++ b/arch/x86/kvm/vmx/sgx.c @@ -182,8 +182,10 @@ static int __handle_encls_ecreate(struct kvm_vcpu *vcpu, /* Enforce CPUID restriction on max enclave size. */ max_size_log2 = (attributes & SGX_ATTR_MODE64BIT) ? sgx_12_0->edx >> 8 : sgx_12_0->edx; - if (size >= BIT_ULL(max_size_log2)) + if (size >= BIT_ULL(max_size_log2)) { kvm_inject_gp(vcpu, 0); + return 1; + } /* * sgx_virt_ecreate() returns: diff --git a/arch/x86/kvm/vmx/vmcs12.h b/arch/x86/kvm/vmx/vmcs12.h index 746129ddd5ae..01936013428b 100644 --- a/arch/x86/kvm/vmx/vmcs12.h +++ b/arch/x86/kvm/vmx/vmcs12.h @@ -208,9 +208,8 @@ struct __packed vmcs12 { /* * For save/restore compatibility, the vmcs12 field offsets must not change. */ -#define CHECK_OFFSET(field, loc) \ - BUILD_BUG_ON_MSG(offsetof(struct vmcs12, field) != (loc), \ - "Offset of " #field " in struct vmcs12 has changed.") +#define CHECK_OFFSET(field, loc) \ + ASSERT_STRUCT_OFFSET(struct vmcs12, field, loc) static inline void vmx_check_vmcs12_offsets(void) { diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S index 0b5db4de4d09..766c6b3ef5ed 100644 --- a/arch/x86/kvm/vmx/vmenter.S +++ b/arch/x86/kvm/vmx/vmenter.S @@ -269,6 +269,7 @@ SYM_FUNC_END(__vmx_vcpu_run) .section .text, "ax" +#ifndef CONFIG_CC_HAS_ASM_GOTO_OUTPUT /** * vmread_error_trampoline - Trampoline from inline asm to vmread_error() * @field: VMCS field encoding that failed @@ -317,6 +318,7 @@ SYM_FUNC_START(vmread_error_trampoline) RET SYM_FUNC_END(vmread_error_trampoline) +#endif SYM_FUNC_START(vmx_do_interrupt_nmi_irqoff) /* diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 63247c57c72c..fe5615fd8295 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -51,7 +51,6 @@ #include "capabilities.h" #include "cpuid.h" -#include "evmcs.h" #include "hyperv.h" #include "kvm_onhyperv.h" #include "irq.h" @@ -66,6 +65,7 @@ #include "vmcs12.h" #include "vmx.h" #include "x86.h" +#include "smm.h" MODULE_AUTHOR("Qumranet"); MODULE_LICENSE("GPL"); @@ -526,7 +526,7 @@ static unsigned long host_idt_base; static bool __read_mostly enlightened_vmcs = true; module_param(enlightened_vmcs, bool, 0444); -static int hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu) +static int hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu) { struct hv_enlightened_vmcs *evmcs; struct hv_partition_assist_pg **p_hv_pa_pg = @@ -858,7 +858,7 @@ unsigned int __vmx_vcpu_run_flags(struct vcpu_vmx *vmx) * to change it directly without causing a vmexit. In that case read * it after vmexit and store it in vmx->spec_ctrl. */ - if (unlikely(!msr_write_intercepted(vmx, MSR_IA32_SPEC_CTRL))) + if (!msr_write_intercepted(vmx, MSR_IA32_SPEC_CTRL)) flags |= VMX_RUN_SAVE_SPEC_CTRL; return flags; @@ -1348,8 +1348,10 @@ void vmx_vcpu_load_vmcs(struct kvm_vcpu *vcpu, int cpu, /* * No indirect branch prediction barrier needed when switching - * the active VMCS within a guest, e.g. on nested VM-Enter. - * The L1 VMM can protect itself with retpolines, IBPB or IBRS. + * the active VMCS within a vCPU, unless IBRS is advertised to + * the vCPU. To minimize the number of IBPBs executed, KVM + * performs IBPB on nested VM-Exit (a single nested transition + * may switch the active VMCS multiple times). */ if (!buddy || WARN_ON_ONCE(buddy->vmcs != prev)) indirect_branch_prediction_barrier(); @@ -1834,12 +1836,42 @@ bool nested_vmx_allowed(struct kvm_vcpu *vcpu) return nested && guest_cpuid_has(vcpu, X86_FEATURE_VMX); } -static inline bool vmx_feature_control_msr_valid(struct kvm_vcpu *vcpu, - uint64_t val) +/* + * Userspace is allowed to set any supported IA32_FEATURE_CONTROL regardless of + * guest CPUID. Note, KVM allows userspace to set "VMX in SMX" to maintain + * backwards compatibility even though KVM doesn't support emulating SMX. And + * because userspace set "VMX in SMX", the guest must also be allowed to set it, + * e.g. if the MSR is left unlocked and the guest does a RMW operation. + */ +#define KVM_SUPPORTED_FEATURE_CONTROL (FEAT_CTL_LOCKED | \ + FEAT_CTL_VMX_ENABLED_INSIDE_SMX | \ + FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX | \ + FEAT_CTL_SGX_LC_ENABLED | \ + FEAT_CTL_SGX_ENABLED | \ + FEAT_CTL_LMCE_ENABLED) + +static inline bool is_vmx_feature_control_msr_valid(struct vcpu_vmx *vmx, + struct msr_data *msr) { - uint64_t valid_bits = to_vmx(vcpu)->msr_ia32_feature_control_valid_bits; + uint64_t valid_bits; + + /* + * Ensure KVM_SUPPORTED_FEATURE_CONTROL is updated when new bits are + * exposed to the guest. + */ + WARN_ON_ONCE(vmx->msr_ia32_feature_control_valid_bits & + ~KVM_SUPPORTED_FEATURE_CONTROL); + + if (!msr->host_initiated && + (vmx->msr_ia32_feature_control & FEAT_CTL_LOCKED)) + return false; + + if (msr->host_initiated) + valid_bits = KVM_SUPPORTED_FEATURE_CONTROL; + else + valid_bits = vmx->msr_ia32_feature_control_valid_bits; - return !(val & ~valid_bits); + return !(msr->data & ~valid_bits); } static int vmx_get_msr_feature(struct kvm_msr_entry *msr) @@ -1849,9 +1881,6 @@ static int vmx_get_msr_feature(struct kvm_msr_entry *msr) if (!nested) return 1; return vmx_get_vmx_msr(&vmcs_config.nested, msr->index, &msr->data); - case MSR_IA32_PERF_CAPABILITIES: - msr->data = vmx_get_perf_capabilities(); - return 0; default: return KVM_MSR_RET_INVALID; } @@ -2029,7 +2058,7 @@ static u64 vmx_get_supported_debugctl(struct kvm_vcpu *vcpu, bool host_initiated (host_initiated || guest_cpuid_has(vcpu, X86_FEATURE_BUS_LOCK_DETECT))) debugctl |= DEBUGCTLMSR_BUS_LOCK_DETECT; - if ((vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT) && + if ((kvm_caps.supported_perf_cap & PMU_CAP_LBR_FMT) && (host_initiated || intel_pmu_lbr_is_enabled(vcpu))) debugctl |= DEBUGCTLMSR_LBR | DEBUGCTLMSR_FREEZE_LBRS_ON_PMI; @@ -2241,10 +2270,9 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) vcpu->arch.mcg_ext_ctl = data; break; case MSR_IA32_FEAT_CTL: - if (!vmx_feature_control_msr_valid(vcpu, data) || - (to_vmx(vcpu)->msr_ia32_feature_control & - FEAT_CTL_LOCKED && !msr_info->host_initiated)) + if (!is_vmx_feature_control_msr_valid(vmx, msr_info)) return 1; + vmx->msr_ia32_feature_control = data; if (msr_info->host_initiated && data == 0) vmx_leave_nested(vcpu); @@ -2342,14 +2370,14 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; if (data & PMU_CAP_LBR_FMT) { if ((data & PMU_CAP_LBR_FMT) != - (vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT)) + (kvm_caps.supported_perf_cap & PMU_CAP_LBR_FMT)) return 1; if (!cpuid_model_is_consistent(vcpu)) return 1; } if (data & PERF_CAP_PEBS_FORMAT) { if ((data & PERF_CAP_PEBS_MASK) != - (vmx_get_perf_capabilities() & PERF_CAP_PEBS_MASK)) + (kvm_caps.supported_perf_cap & PERF_CAP_PEBS_MASK)) return 1; if (!guest_cpuid_has(vcpu, X86_FEATURE_DS)) return 1; @@ -6844,6 +6872,8 @@ static bool vmx_has_emulated_msr(struct kvm *kvm, u32 index) { switch (index) { case MSR_IA32_SMBASE: + if (!IS_ENABLED(CONFIG_KVM_SMM)) + return false; /* * We cannot do SMM unless we can run the guest in big * real mode. @@ -7669,6 +7699,31 @@ static void vmx_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) vmx_update_exception_bitmap(vcpu); } +static u64 vmx_get_perf_capabilities(void) +{ + u64 perf_cap = PMU_CAP_FW_WRITES; + struct x86_pmu_lbr lbr; + u64 host_perf_cap = 0; + + if (!enable_pmu) + return 0; + + if (boot_cpu_has(X86_FEATURE_PDCM)) + rdmsrl(MSR_IA32_PERF_CAPABILITIES, host_perf_cap); + + x86_perf_get_lbr(&lbr); + if (lbr.nr) + perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT; + + if (vmx_pebs_supported()) { + perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK; + if ((perf_cap & PERF_CAP_PEBS_FORMAT) < 4) + perf_cap &= ~PERF_CAP_PEBS_BASELINE; + } + + return perf_cap; +} + static __init void vmx_set_cpu_caps(void) { kvm_set_cpu_caps(); @@ -7691,6 +7746,7 @@ static __init void vmx_set_cpu_caps(void) if (!enable_pmu) kvm_cpu_cap_clear(X86_FEATURE_PDCM); + kvm_caps.supported_perf_cap = vmx_get_perf_capabilities(); if (!enable_sgx) { kvm_cpu_cap_clear(X86_FEATURE_SGX); @@ -7906,6 +7962,7 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu) ~FEAT_CTL_LMCE_ENABLED; } +#ifdef CONFIG_KVM_SMM static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection) { /* we need a nested vmexit to enter SMM, postpone if run is pending */ @@ -7914,7 +7971,7 @@ static int vmx_smi_allowed(struct kvm_vcpu *vcpu, bool for_injection) return !is_smm(vcpu); } -static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate) +static int vmx_enter_smm(struct kvm_vcpu *vcpu, union kvm_smram *smram) { struct vcpu_vmx *vmx = to_vmx(vcpu); @@ -7935,7 +7992,7 @@ static int vmx_enter_smm(struct kvm_vcpu *vcpu, char *smstate) return 0; } -static int vmx_leave_smm(struct kvm_vcpu *vcpu, const char *smstate) +static int vmx_leave_smm(struct kvm_vcpu *vcpu, const union kvm_smram *smram) { struct vcpu_vmx *vmx = to_vmx(vcpu); int ret; @@ -7960,6 +8017,7 @@ static void vmx_enable_smi_window(struct kvm_vcpu *vcpu) { /* RSM will cause a vmexit anyway. */ } +#endif static bool vmx_apic_init_signal_blocked(struct kvm_vcpu *vcpu) { @@ -8127,10 +8185,12 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = { .setup_mce = vmx_setup_mce, +#ifdef CONFIG_KVM_SMM .smi_allowed = vmx_smi_allowed, .enter_smm = vmx_enter_smm, .leave_smm = vmx_leave_smm, .enable_smi_window = vmx_enable_smi_window, +#endif .can_emulate_instruction = vmx_can_emulate_instruction, .apic_init_signal_blocked = vmx_apic_init_signal_blocked, @@ -8490,8 +8550,8 @@ static int __init vmx_init(void) } if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) - vmx_x86_ops.enable_direct_tlbflush - = hv_enable_direct_tlbflush; + vmx_x86_ops.enable_l2_tlb_flush + = hv_enable_l2_tlb_flush; } else { enlightened_vmcs = false; diff --git a/arch/x86/kvm/vmx/vmx_ops.h b/arch/x86/kvm/vmx/vmx_ops.h index ec268df83ed6..842dc898c972 100644 --- a/arch/x86/kvm/vmx/vmx_ops.h +++ b/arch/x86/kvm/vmx/vmx_ops.h @@ -6,19 +6,33 @@ #include <asm/vmx.h> -#include "evmcs.h" +#include "hyperv.h" #include "vmcs.h" #include "../x86.h" void vmread_error(unsigned long field, bool fault); -__attribute__((regparm(0))) void vmread_error_trampoline(unsigned long field, - bool fault); void vmwrite_error(unsigned long field, unsigned long value); void vmclear_error(struct vmcs *vmcs, u64 phys_addr); void vmptrld_error(struct vmcs *vmcs, u64 phys_addr); void invvpid_error(unsigned long ext, u16 vpid, gva_t gva); void invept_error(unsigned long ext, u64 eptp, gpa_t gpa); +#ifndef CONFIG_CC_HAS_ASM_GOTO_OUTPUT +/* + * The VMREAD error trampoline _always_ uses the stack to pass parameters, even + * for 64-bit targets. Preserving all registers allows the VMREAD inline asm + * blob to avoid clobbering GPRs, which in turn allows the compiler to better + * optimize sequences of VMREADs. + * + * Declare the trampoline as an opaque label as it's not safe to call from C + * code; there is no way to tell the compiler to pass params on the stack for + * 64-bit targets. + * + * void vmread_error_trampoline(unsigned long field, bool fault); + */ +extern unsigned long vmread_error_trampoline; +#endif + static __always_inline void vmcs_check16(unsigned long field) { BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000, diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 69227f77b201..312aea1854ae 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -30,6 +30,7 @@ #include "hyperv.h" #include "lapic.h" #include "xen.h" +#include "smm.h" #include <linux/clocksource.h> #include <linux/interrupt.h> @@ -119,8 +120,6 @@ static u64 __read_mostly cr4_reserved_bits = CR4_RESERVED_BITS; static void update_cr8_intercept(struct kvm_vcpu *vcpu); static void process_nmi(struct kvm_vcpu *vcpu); -static void process_smi(struct kvm_vcpu *vcpu); -static void enter_smm(struct kvm_vcpu *vcpu); static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); static void store_regs(struct kvm_vcpu *vcpu); static int sync_regs(struct kvm_vcpu *vcpu); @@ -464,7 +463,6 @@ u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) { return vcpu->arch.apic_base; } -EXPORT_SYMBOL_GPL(kvm_get_apic_base); enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu) { @@ -492,7 +490,6 @@ int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info) kvm_recalculate_apic_map(vcpu->kvm); return 0; } -EXPORT_SYMBOL_GPL(kvm_set_apic_base); /* * Handle a fault on a hardware virtualization (VMX or SVM) instruction. @@ -783,7 +780,6 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) kvm_queue_exception_e_p(vcpu, PF_VECTOR, fault->error_code, fault->address); } -EXPORT_SYMBOL_GPL(kvm_inject_page_fault); void kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) @@ -812,7 +808,6 @@ void kvm_inject_nmi(struct kvm_vcpu *vcpu) atomic_inc(&vcpu->arch.nmi_queued); kvm_make_request(KVM_REQ_NMI, vcpu); } -EXPORT_SYMBOL_GPL(kvm_inject_nmi); void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) { @@ -837,7 +832,6 @@ bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) kvm_queue_exception_e(vcpu, GP_VECTOR, 0); return false; } -EXPORT_SYMBOL_GPL(kvm_require_cpl); bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr) { @@ -1654,6 +1648,9 @@ static int kvm_get_msr_feature(struct kvm_msr_entry *msr) case MSR_IA32_ARCH_CAPABILITIES: msr->data = kvm_get_arch_capabilities(); break; + case MSR_IA32_PERF_CAPABILITIES: + msr->data = kvm_caps.supported_perf_cap; + break; case MSR_IA32_UCODE_REV: rdmsrl_safe(msr->index, &msr->data); break; @@ -2067,7 +2064,6 @@ int kvm_emulate_as_nop(struct kvm_vcpu *vcpu) { return kvm_skip_emulated_instruction(vcpu); } -EXPORT_SYMBOL_GPL(kvm_emulate_as_nop); int kvm_emulate_invd(struct kvm_vcpu *vcpu) { @@ -2315,13 +2311,11 @@ static void kvm_write_system_time(struct kvm_vcpu *vcpu, gpa_t system_time, kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu); /* we verify if the enable bit is set... */ - if (system_time & 1) { - kvm_gpc_activate(vcpu->kvm, &vcpu->arch.pv_time, vcpu, - KVM_HOST_USES_PFN, system_time & ~1ULL, + if (system_time & 1) + kvm_gpc_activate(&vcpu->arch.pv_time, system_time & ~1ULL, sizeof(struct pvclock_vcpu_time_info)); - } else { - kvm_gpc_deactivate(vcpu->kvm, &vcpu->arch.pv_time); - } + else + kvm_gpc_deactivate(&vcpu->arch.pv_time); return; } @@ -2513,7 +2507,6 @@ u64 kvm_scale_tsc(u64 tsc, u64 ratio) return _tsc; } -EXPORT_SYMBOL_GPL(kvm_scale_tsc); static u64 kvm_compute_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) { @@ -2972,6 +2965,22 @@ static void kvm_update_masterclock(struct kvm *kvm) kvm_end_pvclock_update(kvm); } +/* + * Use the kernel's tsc_khz directly if the TSC is constant, otherwise use KVM's + * per-CPU value (which may be zero if a CPU is going offline). Note, tsc_khz + * can change during boot even if the TSC is constant, as it's possible for KVM + * to be loaded before TSC calibration completes. Ideally, KVM would get a + * notification when calibration completes, but practically speaking calibration + * will complete before userspace is alive enough to create VMs. + */ +static unsigned long get_cpu_tsc_khz(void) +{ + if (static_cpu_has(X86_FEATURE_CONSTANT_TSC)) + return tsc_khz; + else + return __this_cpu_read(cpu_tsc_khz); +} + /* Called within read_seqcount_begin/retry for kvm->pvclock_sc. */ static void __get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data) { @@ -2982,7 +2991,8 @@ static void __get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data) get_cpu(); data->flags = 0; - if (ka->use_master_clock && __this_cpu_read(cpu_tsc_khz)) { + if (ka->use_master_clock && + (static_cpu_has(X86_FEATURE_CONSTANT_TSC) || __this_cpu_read(cpu_tsc_khz))) { #ifdef CONFIG_X86_64 struct timespec64 ts; @@ -2996,7 +3006,7 @@ static void __get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data) data->flags |= KVM_CLOCK_TSC_STABLE; hv_clock.tsc_timestamp = ka->master_cycle_now; hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset; - kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL, + kvm_get_time_scale(NSEC_PER_SEC, get_cpu_tsc_khz() * 1000LL, &hv_clock.tsc_shift, &hv_clock.tsc_to_system_mul); data->clock = __pvclock_read_cycles(&hv_clock, data->host_tsc); @@ -3035,12 +3045,10 @@ static void kvm_setup_guest_pvclock(struct kvm_vcpu *v, unsigned long flags; read_lock_irqsave(&gpc->lock, flags); - while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa, - offset + sizeof(*guest_hv_clock))) { + while (!kvm_gpc_check(gpc, offset + sizeof(*guest_hv_clock))) { read_unlock_irqrestore(&gpc->lock, flags); - if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa, - offset + sizeof(*guest_hv_clock))) + if (kvm_gpc_refresh(gpc, offset + sizeof(*guest_hv_clock))) return; read_lock_irqsave(&gpc->lock, flags); @@ -3106,7 +3114,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v) /* Keep irq disabled to prevent changes to the clock */ local_irq_save(flags); - tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz); + tgt_tsc_khz = get_cpu_tsc_khz(); if (unlikely(tgt_tsc_khz == 0)) { local_irq_restore(flags); kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); @@ -3389,7 +3397,7 @@ static int kvm_pv_enable_async_pf_int(struct kvm_vcpu *vcpu, u64 data) static void kvmclock_reset(struct kvm_vcpu *vcpu) { - kvm_gpc_deactivate(vcpu->kvm, &vcpu->arch.pv_time); + kvm_gpc_deactivate(&vcpu->arch.pv_time); vcpu->arch.time = 0; } @@ -3397,6 +3405,9 @@ static void kvm_vcpu_flush_tlb_all(struct kvm_vcpu *vcpu) { ++vcpu->stat.tlb_flush; static_call(kvm_x86_flush_tlb_all)(vcpu); + + /* Flushing all ASIDs flushes the current ASID... */ + kvm_clear_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); } static void kvm_vcpu_flush_tlb_guest(struct kvm_vcpu *vcpu) @@ -3415,6 +3426,12 @@ static void kvm_vcpu_flush_tlb_guest(struct kvm_vcpu *vcpu) } static_call(kvm_x86_flush_tlb_guest)(vcpu); + + /* + * Flushing all "guest" TLB is always a superset of Hyper-V's fine + * grained flushing. + */ + kvm_hv_vcpu_purge_flush_tlb(vcpu); } @@ -3566,20 +3583,15 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; vcpu->arch.arch_capabilities = data; break; - case MSR_IA32_PERF_CAPABILITIES: { - struct kvm_msr_entry msr_ent = {.index = msr, .data = 0}; - + case MSR_IA32_PERF_CAPABILITIES: if (!msr_info->host_initiated) return 1; - if (kvm_get_msr_feature(&msr_ent)) - return 1; - if (data & ~msr_ent.data) + if (data & ~kvm_caps.supported_perf_cap) return 1; vcpu->arch.perf_capabilities = data; kvm_pmu_refresh(vcpu); return 0; - } case MSR_EFER: return set_efer(vcpu, msr_info); case MSR_K7_HWCR: @@ -3651,7 +3663,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) break; } case MSR_IA32_SMBASE: - if (!msr_info->host_initiated) + if (!IS_ENABLED(CONFIG_KVM_SMM) || !msr_info->host_initiated) return 1; vcpu->arch.smbase = data; break; @@ -4067,7 +4079,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) msr_info->data = vcpu->arch.ia32_misc_enable_msr; break; case MSR_IA32_SMBASE: - if (!msr_info->host_initiated) + if (!IS_ENABLED(CONFIG_KVM_SMM) || !msr_info->host_initiated) return 1; msr_info->data = vcpu->arch.smbase; break; @@ -4425,7 +4437,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL | KVM_XEN_HVM_CONFIG_EVTCHN_SEND; if (sched_info_on()) - r |= KVM_XEN_HVM_CONFIG_RUNSTATE; + r |= KVM_XEN_HVM_CONFIG_RUNSTATE | + KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG; break; #endif case KVM_CAP_SYNC_REGS: @@ -4441,6 +4454,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r |= KVM_X86_DISABLE_EXITS_MWAIT; break; case KVM_CAP_X86_SMM: + if (!IS_ENABLED(CONFIG_KVM_SMM)) + break; + /* SMBASE is usually relocated above 1M on modern chipsets, * and SMM handlers might indeed rely on 4G segment limits, * so do not report SMM to be available if real mode is @@ -4481,7 +4497,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) kvm_x86_ops.nested_ops->get_state(NULL, NULL, 0) : 0; break; case KVM_CAP_HYPERV_DIRECT_TLBFLUSH: - r = kvm_x86_ops.enable_direct_tlbflush != NULL; + r = kvm_x86_ops.enable_l2_tlb_flush != NULL; break; case KVM_CAP_HYPERV_ENLIGHTENED_VMCS: r = kvm_x86_ops.nested_ops->enable_evmcs != NULL; @@ -4897,13 +4913,6 @@ static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) return 0; } -static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu) -{ - kvm_make_request(KVM_REQ_SMI, vcpu); - - return 0; -} - static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, struct kvm_tpr_access_ctl *tac) { @@ -5039,8 +5048,10 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, process_nmi(vcpu); +#ifdef CONFIG_KVM_SMM if (kvm_check_request(KVM_REQ_SMI, vcpu)) process_smi(vcpu); +#endif /* * KVM's ABI only allows for one exception to be migrated. Luckily, @@ -5068,16 +5079,15 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, ex->pending && ex->has_payload) kvm_deliver_exception_payload(vcpu, ex); + memset(events, 0, sizeof(*events)); + /* * The API doesn't provide the instruction length for software * exceptions, so don't report them. As long as the guest RIP * isn't advanced, we should expect to encounter the exception * again. */ - if (kvm_exception_is_soft(ex->vector)) { - events->exception.injected = 0; - events->exception.pending = 0; - } else { + if (!kvm_exception_is_soft(ex->vector)) { events->exception.injected = ex->injected; events->exception.pending = ex->pending; /* @@ -5097,20 +5107,20 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, events->interrupt.injected = vcpu->arch.interrupt.injected && !vcpu->arch.interrupt.soft; events->interrupt.nr = vcpu->arch.interrupt.nr; - events->interrupt.soft = 0; events->interrupt.shadow = static_call(kvm_x86_get_interrupt_shadow)(vcpu); events->nmi.injected = vcpu->arch.nmi_injected; events->nmi.pending = vcpu->arch.nmi_pending != 0; events->nmi.masked = static_call(kvm_x86_get_nmi_mask)(vcpu); - events->nmi.pad = 0; - events->sipi_vector = 0; /* never valid when reporting to user space */ + /* events->sipi_vector is never valid when reporting to user space */ +#ifdef CONFIG_KVM_SMM events->smi.smm = is_smm(vcpu); events->smi.pending = vcpu->arch.smi_pending; events->smi.smm_inside_nmi = !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK); +#endif events->smi.latched_init = kvm_lapic_latched_init(vcpu); events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING @@ -5122,12 +5132,8 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, events->triple_fault.pending = kvm_test_request(KVM_REQ_TRIPLE_FAULT, vcpu); events->flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT; } - - memset(&events->reserved, 0, sizeof(events->reserved)); } -static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm); - static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, struct kvm_vcpu_events *events) { @@ -5200,6 +5206,7 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, vcpu->arch.apic->sipi_vector = events->sipi_vector; if (events->flags & KVM_VCPUEVENT_VALID_SMM) { +#ifdef CONFIG_KVM_SMM if (!!(vcpu->arch.hflags & HF_SMM_MASK) != events->smi.smm) { kvm_leave_nested(vcpu); kvm_smm_changed(vcpu, events->smi.smm); @@ -5214,6 +5221,12 @@ static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK; } +#else + if (events->smi.smm || events->smi.pending || + events->smi.smm_inside_nmi) + return -EINVAL; +#endif + if (lapic_in_kernel(vcpu)) { if (events->smi.latched_init) set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events); @@ -5497,10 +5510,10 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, } return r; case KVM_CAP_HYPERV_DIRECT_TLBFLUSH: - if (!kvm_x86_ops.enable_direct_tlbflush) + if (!kvm_x86_ops.enable_l2_tlb_flush) return -ENOTTY; - return static_call(kvm_x86_enable_direct_tlbflush)(vcpu); + return static_call(kvm_x86_enable_l2_tlb_flush)(vcpu); case KVM_CAP_HYPERV_ENFORCE_CPUID: return kvm_hv_set_enforce_cpuid(vcpu, cap->args[0]); @@ -5580,7 +5593,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp, break; } case KVM_SMI: { - r = kvm_vcpu_ioctl_smi(vcpu); + r = kvm_inject_smi(vcpu); break; } case KVM_SET_CPUID: { @@ -6239,9 +6252,7 @@ split_irqchip_unlock: break; case KVM_CAP_X86_USER_SPACE_MSR: r = -EINVAL; - if (cap->args[0] & ~(KVM_MSR_EXIT_REASON_INVAL | - KVM_MSR_EXIT_REASON_UNKNOWN | - KVM_MSR_EXIT_REASON_FILTER)) + if (cap->args[0] & ~KVM_MSR_EXIT_REASON_VALID_MASK) break; kvm->arch.user_space_msr_mask = cap->args[0]; r = 0; @@ -6418,7 +6429,7 @@ static int kvm_add_msr_filter(struct kvm_x86_msr_filter *msr_filter, if (!user_range->nmsrs) return 0; - if (user_range->flags & ~(KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE)) + if (user_range->flags & ~KVM_MSR_FILTER_RANGE_VALID_MASK) return -EINVAL; if (!user_range->flags) @@ -6452,7 +6463,7 @@ static int kvm_vm_ioctl_set_msr_filter(struct kvm *kvm, int r = 0; u32 i; - if (filter->flags & ~KVM_MSR_FILTER_DEFAULT_DENY) + if (filter->flags & ~KVM_MSR_FILTER_VALID_MASK) return -EINVAL; for (i = 0; i < ARRAY_SIZE(filter->ranges); i++) @@ -7125,8 +7136,8 @@ static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v) return handled; } -static void kvm_set_segment(struct kvm_vcpu *vcpu, - struct kvm_segment *var, int seg) +void kvm_set_segment(struct kvm_vcpu *vcpu, + struct kvm_segment *var, int seg) { static_call(kvm_x86_set_segment)(vcpu, var, seg); } @@ -7162,16 +7173,6 @@ gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, } EXPORT_SYMBOL_GPL(kvm_mmu_gva_to_gpa_read); - gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, - struct x86_exception *exception) -{ - struct kvm_mmu *mmu = vcpu->arch.walk_mmu; - - u64 access = (static_call(kvm_x86_get_cpl)(vcpu) == 3) ? PFERR_USER_MASK : 0; - access |= PFERR_FETCH_MASK; - return mmu->gva_to_gpa(vcpu, mmu, gva, access, exception); -} - gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, struct x86_exception *exception) { @@ -7284,15 +7285,6 @@ static int emulator_read_std(struct x86_emulate_ctxt *ctxt, return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception); } -static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt, - unsigned long addr, void *val, unsigned int bytes) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes); - - return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE; -} - static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes, struct kvm_vcpu *vcpu, u64 access, struct x86_exception *exception) @@ -8084,26 +8076,6 @@ static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata); } -static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, - u32 msr_index, u64 data) -{ - return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data); -} - -static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - return vcpu->arch.smbase; -} - -static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - vcpu->arch.smbase = smbase; -} - static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt, u32 pmc) { @@ -8178,18 +8150,13 @@ static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt) return emul_to_vcpu(ctxt)->arch.hflags; } -static void emulator_exiting_smm(struct x86_emulate_ctxt *ctxt) +#ifndef CONFIG_KVM_SMM +static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt) { - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - kvm_smm_changed(vcpu, false); -} - -static int emulator_leave_smm(struct x86_emulate_ctxt *ctxt, - const char *smstate) -{ - return static_call(kvm_x86_leave_smm)(emul_to_vcpu(ctxt), smstate); + WARN_ON_ONCE(1); + return X86EMUL_UNHANDLEABLE; } +#endif static void emulator_triple_fault(struct x86_emulate_ctxt *ctxt) { @@ -8215,7 +8182,6 @@ static const struct x86_emulate_ops emulate_ops = { .write_gpr = emulator_write_gpr, .read_std = emulator_read_std, .write_std = emulator_write_std, - .read_phys = kvm_read_guest_phys_system, .fetch = kvm_fetch_guest_virt, .read_emulated = emulator_read_emulated, .write_emulated = emulator_write_emulated, @@ -8235,11 +8201,8 @@ static const struct x86_emulate_ops emulate_ops = { .cpl = emulator_get_cpl, .get_dr = emulator_get_dr, .set_dr = emulator_set_dr, - .get_smbase = emulator_get_smbase, - .set_smbase = emulator_set_smbase, .set_msr_with_filter = emulator_set_msr_with_filter, .get_msr_with_filter = emulator_get_msr_with_filter, - .set_msr = emulator_set_msr, .get_msr = emulator_get_msr, .check_pmc = emulator_check_pmc, .read_pmc = emulator_read_pmc, @@ -8254,7 +8217,6 @@ static const struct x86_emulate_ops emulate_ops = { .guest_has_rdpid = emulator_guest_has_rdpid, .set_nmi_mask = emulator_set_nmi_mask, .get_hflags = emulator_get_hflags, - .exiting_smm = emulator_exiting_smm, .leave_smm = emulator_leave_smm, .triple_fault = emulator_triple_fault, .set_xcr = emulator_set_xcr, @@ -8327,8 +8289,6 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu) cs_db ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK); - BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK); - BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK); ctxt->interruptibility = 0; ctxt->have_exception = false; @@ -8587,29 +8547,6 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt, static int complete_emulated_mmio(struct kvm_vcpu *vcpu); static int complete_emulated_pio(struct kvm_vcpu *vcpu); -static void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm) -{ - trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm); - - if (entering_smm) { - vcpu->arch.hflags |= HF_SMM_MASK; - } else { - vcpu->arch.hflags &= ~(HF_SMM_MASK | HF_SMM_INSIDE_NMI_MASK); - - /* Process a latched INIT or SMI, if any. */ - kvm_make_request(KVM_REQ_EVENT, vcpu); - - /* - * Even if KVM_SET_SREGS2 loaded PDPTRs out of band, - * on SMM exit we still need to reload them from - * guest memory - */ - vcpu->arch.pdptrs_from_userspace = false; - } - - kvm_mmu_reset_context(vcpu); -} - static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7, unsigned long *db) { @@ -8841,7 +8778,9 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, write_fault_to_spt, emulation_type)) return 1; - if (ctxt->have_exception) { + + if (ctxt->have_exception && + !(emulation_type & EMULTYPE_SKIP)) { /* * #UD should result in just EMULATION_FAILED, and trap-like * exception should not be encountered during decode. @@ -9105,9 +9044,11 @@ static void tsc_khz_changed(void *data) struct cpufreq_freqs *freq = data; unsigned long khz = 0; + WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_CONSTANT_TSC)); + if (data) khz = freq->new; - else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) + else khz = cpufreq_quick_get(raw_smp_processor_id()); if (!khz) khz = tsc_khz; @@ -9128,8 +9069,10 @@ static void kvm_hyperv_tsc_notifier(void) hyperv_stop_tsc_emulation(); /* TSC frequency always matches when on Hyper-V */ - for_each_present_cpu(cpu) - per_cpu(cpu_tsc_khz, cpu) = tsc_khz; + if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { + for_each_present_cpu(cpu) + per_cpu(cpu_tsc_khz, cpu) = tsc_khz; + } kvm_caps.max_guest_tsc_khz = tsc_khz; list_for_each_entry(kvm, &vm_list, vm_list) { @@ -9266,10 +9209,10 @@ static void kvm_timer_init(void) } cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER); - } - cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online", - kvmclock_cpu_online, kvmclock_cpu_down_prep); + cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online", + kvmclock_cpu_online, kvmclock_cpu_down_prep); + } } #ifdef CONFIG_X86_64 @@ -9429,10 +9372,11 @@ void kvm_arch_exit(void) #endif kvm_lapic_exit(); - if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) + if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER); - cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); + cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE); + } #ifdef CONFIG_X86_64 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier); irq_work_sync(&pvclock_irq_work); @@ -9999,6 +9943,7 @@ static int kvm_check_and_inject_events(struct kvm_vcpu *vcpu, * in order to make progress and get back here for another iteration. * The kvm_x86_ops hooks communicate this by returning -EBUSY. */ +#ifdef CONFIG_KVM_SMM if (vcpu->arch.smi_pending) { r = can_inject ? static_call(kvm_x86_smi_allowed)(vcpu, true) : -EBUSY; if (r < 0) @@ -10011,6 +9956,7 @@ static int kvm_check_and_inject_events(struct kvm_vcpu *vcpu, } else static_call(kvm_x86_enable_smi_window)(vcpu); } +#endif if (vcpu->arch.nmi_pending) { r = can_inject ? static_call(kvm_x86_nmi_allowed)(vcpu, true) : -EBUSY; @@ -10086,246 +10032,6 @@ static void process_nmi(struct kvm_vcpu *vcpu) kvm_make_request(KVM_REQ_EVENT, vcpu); } -static u32 enter_smm_get_segment_flags(struct kvm_segment *seg) -{ - u32 flags = 0; - flags |= seg->g << 23; - flags |= seg->db << 22; - flags |= seg->l << 21; - flags |= seg->avl << 20; - flags |= seg->present << 15; - flags |= seg->dpl << 13; - flags |= seg->s << 12; - flags |= seg->type << 8; - return flags; -} - -static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n) -{ - struct kvm_segment seg; - int offset; - - kvm_get_segment(vcpu, &seg, n); - put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector); - - if (n < 3) - offset = 0x7f84 + n * 12; - else - offset = 0x7f2c + (n - 3) * 12; - - put_smstate(u32, buf, offset + 8, seg.base); - put_smstate(u32, buf, offset + 4, seg.limit); - put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg)); -} - -#ifdef CONFIG_X86_64 -static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n) -{ - struct kvm_segment seg; - int offset; - u16 flags; - - kvm_get_segment(vcpu, &seg, n); - offset = 0x7e00 + n * 16; - - flags = enter_smm_get_segment_flags(&seg) >> 8; - put_smstate(u16, buf, offset, seg.selector); - put_smstate(u16, buf, offset + 2, flags); - put_smstate(u32, buf, offset + 4, seg.limit); - put_smstate(u64, buf, offset + 8, seg.base); -} -#endif - -static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf) -{ - struct desc_ptr dt; - struct kvm_segment seg; - unsigned long val; - int i; - - put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu)); - put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu)); - put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu)); - put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu)); - - for (i = 0; i < 8; i++) - put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read_raw(vcpu, i)); - - kvm_get_dr(vcpu, 6, &val); - put_smstate(u32, buf, 0x7fcc, (u32)val); - kvm_get_dr(vcpu, 7, &val); - put_smstate(u32, buf, 0x7fc8, (u32)val); - - kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); - put_smstate(u32, buf, 0x7fc4, seg.selector); - put_smstate(u32, buf, 0x7f64, seg.base); - put_smstate(u32, buf, 0x7f60, seg.limit); - put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg)); - - kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); - put_smstate(u32, buf, 0x7fc0, seg.selector); - put_smstate(u32, buf, 0x7f80, seg.base); - put_smstate(u32, buf, 0x7f7c, seg.limit); - put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg)); - - static_call(kvm_x86_get_gdt)(vcpu, &dt); - put_smstate(u32, buf, 0x7f74, dt.address); - put_smstate(u32, buf, 0x7f70, dt.size); - - static_call(kvm_x86_get_idt)(vcpu, &dt); - put_smstate(u32, buf, 0x7f58, dt.address); - put_smstate(u32, buf, 0x7f54, dt.size); - - for (i = 0; i < 6; i++) - enter_smm_save_seg_32(vcpu, buf, i); - - put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu)); - - /* revision id */ - put_smstate(u32, buf, 0x7efc, 0x00020000); - put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase); -} - -#ifdef CONFIG_X86_64 -static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf) -{ - struct desc_ptr dt; - struct kvm_segment seg; - unsigned long val; - int i; - - for (i = 0; i < 16; i++) - put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read_raw(vcpu, i)); - - put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu)); - put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu)); - - kvm_get_dr(vcpu, 6, &val); - put_smstate(u64, buf, 0x7f68, val); - kvm_get_dr(vcpu, 7, &val); - put_smstate(u64, buf, 0x7f60, val); - - put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu)); - put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu)); - put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu)); - - put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase); - - /* revision id */ - put_smstate(u32, buf, 0x7efc, 0x00020064); - - put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer); - - kvm_get_segment(vcpu, &seg, VCPU_SREG_TR); - put_smstate(u16, buf, 0x7e90, seg.selector); - put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8); - put_smstate(u32, buf, 0x7e94, seg.limit); - put_smstate(u64, buf, 0x7e98, seg.base); - - static_call(kvm_x86_get_idt)(vcpu, &dt); - put_smstate(u32, buf, 0x7e84, dt.size); - put_smstate(u64, buf, 0x7e88, dt.address); - - kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR); - put_smstate(u16, buf, 0x7e70, seg.selector); - put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8); - put_smstate(u32, buf, 0x7e74, seg.limit); - put_smstate(u64, buf, 0x7e78, seg.base); - - static_call(kvm_x86_get_gdt)(vcpu, &dt); - put_smstate(u32, buf, 0x7e64, dt.size); - put_smstate(u64, buf, 0x7e68, dt.address); - - for (i = 0; i < 6; i++) - enter_smm_save_seg_64(vcpu, buf, i); -} -#endif - -static void enter_smm(struct kvm_vcpu *vcpu) -{ - struct kvm_segment cs, ds; - struct desc_ptr dt; - unsigned long cr0; - char buf[512]; - - memset(buf, 0, 512); -#ifdef CONFIG_X86_64 - if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) - enter_smm_save_state_64(vcpu, buf); - else -#endif - enter_smm_save_state_32(vcpu, buf); - - /* - * Give enter_smm() a chance to make ISA-specific changes to the vCPU - * state (e.g. leave guest mode) after we've saved the state into the - * SMM state-save area. - */ - static_call(kvm_x86_enter_smm)(vcpu, buf); - - kvm_smm_changed(vcpu, true); - kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf)); - - if (static_call(kvm_x86_get_nmi_mask)(vcpu)) - vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK; - else - static_call(kvm_x86_set_nmi_mask)(vcpu, true); - - kvm_set_rflags(vcpu, X86_EFLAGS_FIXED); - kvm_rip_write(vcpu, 0x8000); - - cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG); - static_call(kvm_x86_set_cr0)(vcpu, cr0); - vcpu->arch.cr0 = cr0; - - static_call(kvm_x86_set_cr4)(vcpu, 0); - - /* Undocumented: IDT limit is set to zero on entry to SMM. */ - dt.address = dt.size = 0; - static_call(kvm_x86_set_idt)(vcpu, &dt); - - kvm_set_dr(vcpu, 7, DR7_FIXED_1); - - cs.selector = (vcpu->arch.smbase >> 4) & 0xffff; - cs.base = vcpu->arch.smbase; - - ds.selector = 0; - ds.base = 0; - - cs.limit = ds.limit = 0xffffffff; - cs.type = ds.type = 0x3; - cs.dpl = ds.dpl = 0; - cs.db = ds.db = 0; - cs.s = ds.s = 1; - cs.l = ds.l = 0; - cs.g = ds.g = 1; - cs.avl = ds.avl = 0; - cs.present = ds.present = 1; - cs.unusable = ds.unusable = 0; - cs.padding = ds.padding = 0; - - kvm_set_segment(vcpu, &cs, VCPU_SREG_CS); - kvm_set_segment(vcpu, &ds, VCPU_SREG_DS); - kvm_set_segment(vcpu, &ds, VCPU_SREG_ES); - kvm_set_segment(vcpu, &ds, VCPU_SREG_FS); - kvm_set_segment(vcpu, &ds, VCPU_SREG_GS); - kvm_set_segment(vcpu, &ds, VCPU_SREG_SS); - -#ifdef CONFIG_X86_64 - if (guest_cpuid_has(vcpu, X86_FEATURE_LM)) - static_call(kvm_x86_set_efer)(vcpu, 0); -#endif - - kvm_update_cpuid_runtime(vcpu); - kvm_mmu_reset_context(vcpu); -} - -static void process_smi(struct kvm_vcpu *vcpu) -{ - vcpu->arch.smi_pending = true; - kvm_make_request(KVM_REQ_EVENT, vcpu); -} - void kvm_make_scan_ioapic_request_mask(struct kvm *kvm, unsigned long *vcpu_bitmap) { @@ -10516,20 +10222,17 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) bool req_immediate_exit = false; - /* Forbid vmenter if vcpu dirty ring is soft-full */ - if (unlikely(vcpu->kvm->dirty_ring_size && - kvm_dirty_ring_soft_full(&vcpu->dirty_ring))) { - vcpu->run->exit_reason = KVM_EXIT_DIRTY_RING_FULL; - trace_kvm_dirty_ring_exit(vcpu); - r = 0; - goto out; - } - if (kvm_request_pending(vcpu)) { if (kvm_check_request(KVM_REQ_VM_DEAD, vcpu)) { r = -EIO; goto out; } + + if (kvm_dirty_ring_check_request(vcpu)) { + r = 0; + goto out; + } + if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) { if (unlikely(!kvm_x86_ops.nested_ops->get_nested_state_pages(vcpu))) { r = 0; @@ -10553,14 +10256,27 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) kvm_mmu_sync_roots(vcpu); if (kvm_check_request(KVM_REQ_LOAD_MMU_PGD, vcpu)) kvm_mmu_load_pgd(vcpu); - if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { + + /* + * Note, the order matters here, as flushing "all" TLB entries + * also flushes the "current" TLB entries, i.e. servicing the + * flush "all" will clear any request to flush "current". + */ + if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) kvm_vcpu_flush_tlb_all(vcpu); - /* Flushing all ASIDs flushes the current ASID... */ - kvm_clear_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); - } kvm_service_local_tlb_flush_requests(vcpu); + /* + * Fall back to a "full" guest flush if Hyper-V's precise + * flushing fails. Note, Hyper-V's flushing is per-vCPU, but + * the flushes are considered "remote" and not "local" because + * the requests can be initiated from other vCPUs. + */ + if (kvm_check_request(KVM_REQ_HV_TLB_FLUSH, vcpu) && + kvm_hv_vcpu_flush_tlb(vcpu)) + kvm_vcpu_flush_tlb_guest(vcpu); + if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS; r = 0; @@ -10585,8 +10301,10 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) } if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu)) record_steal_time(vcpu); +#ifdef CONFIG_KVM_SMM if (kvm_check_request(KVM_REQ_SMI, vcpu)) process_smi(vcpu); +#endif if (kvm_check_request(KVM_REQ_NMI, vcpu)) process_nmi(vcpu); if (kvm_check_request(KVM_REQ_PMU, vcpu)) @@ -11834,7 +11552,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) vcpu->arch.regs_avail = ~0; vcpu->arch.regs_dirty = ~0; - kvm_gpc_init(&vcpu->arch.pv_time); + kvm_gpc_init(&vcpu->arch.pv_time, vcpu->kvm, vcpu, KVM_HOST_USES_PFN); if (!irqchip_in_kernel(vcpu->kvm) || kvm_vcpu_is_reset_bsp(vcpu)) vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; @@ -11900,6 +11618,8 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT; kvm_async_pf_hash_reset(vcpu); + + vcpu->arch.perf_capabilities = kvm_caps.supported_perf_cap; kvm_pmu_init(vcpu); vcpu->arch.pending_external_vector = -1; @@ -12334,7 +12054,6 @@ bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu) { return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id; } -EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp); bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu) { @@ -12909,10 +12628,12 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu) static_call(kvm_x86_nmi_allowed)(vcpu, false))) return true; +#ifdef CONFIG_KVM_SMM if (kvm_test_request(KVM_REQ_SMI, vcpu) || (vcpu->arch.smi_pending && static_call(kvm_x86_smi_allowed)(vcpu, false))) return true; +#endif if (kvm_arch_interrupt_allowed(vcpu) && (kvm_cpu_has_interrupt(vcpu) || @@ -12953,7 +12674,9 @@ bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) return true; if (kvm_test_request(KVM_REQ_NMI, vcpu) || +#ifdef CONFIG_KVM_SMM kvm_test_request(KVM_REQ_SMI, vcpu) || +#endif kvm_test_request(KVM_REQ_EVENT, vcpu)) return true; diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 829d3134c1eb..9de72586f406 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -27,6 +27,7 @@ struct kvm_caps { u64 supported_mce_cap; u64 supported_xcr0; u64 supported_xss; + u64 supported_perf_cap; }; void kvm_spurious_fault(void); diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index f3098c0e386a..d7af40240248 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -42,13 +42,12 @@ static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn) int idx = srcu_read_lock(&kvm->srcu); if (gfn == GPA_INVALID) { - kvm_gpc_deactivate(kvm, gpc); + kvm_gpc_deactivate(gpc); goto out; } do { - ret = kvm_gpc_activate(kvm, gpc, NULL, KVM_HOST_USES_PFN, gpa, - PAGE_SIZE); + ret = kvm_gpc_activate(gpc, gpa, PAGE_SIZE); if (ret) goto out; @@ -170,112 +169,45 @@ static void kvm_xen_init_timer(struct kvm_vcpu *vcpu) vcpu->arch.xen.timer.function = xen_timer_callback; } -static void kvm_xen_update_runstate(struct kvm_vcpu *v, int state) +static void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, bool atomic) { struct kvm_vcpu_xen *vx = &v->arch.xen; - u64 now = get_kvmclock_ns(v->kvm); - u64 delta_ns = now - vx->runstate_entry_time; - u64 run_delay = current->sched_info.run_delay; - - if (unlikely(!vx->runstate_entry_time)) - vx->current_runstate = RUNSTATE_offline; - - /* - * Time waiting for the scheduler isn't "stolen" if the - * vCPU wasn't running anyway. - */ - if (vx->current_runstate == RUNSTATE_running) { - u64 steal_ns = run_delay - vx->last_steal; - - delta_ns -= steal_ns; - - vx->runstate_times[RUNSTATE_runnable] += steal_ns; - } - vx->last_steal = run_delay; - - vx->runstate_times[vx->current_runstate] += delta_ns; - vx->current_runstate = state; - vx->runstate_entry_time = now; -} - -void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, int state) -{ - struct kvm_vcpu_xen *vx = &v->arch.xen; - struct gfn_to_pfn_cache *gpc = &vx->runstate_cache; - uint64_t *user_times; + struct gfn_to_pfn_cache *gpc1 = &vx->runstate_cache; + struct gfn_to_pfn_cache *gpc2 = &vx->runstate2_cache; + size_t user_len, user_len1, user_len2; + struct vcpu_runstate_info rs; unsigned long flags; - size_t user_len; - int *user_state; - - kvm_xen_update_runstate(v, state); - - if (!vx->runstate_cache.active) - return; - - if (IS_ENABLED(CONFIG_64BIT) && v->kvm->arch.xen.long_mode) - user_len = sizeof(struct vcpu_runstate_info); - else - user_len = sizeof(struct compat_vcpu_runstate_info); - - read_lock_irqsave(&gpc->lock, flags); - while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa, - user_len)) { - read_unlock_irqrestore(&gpc->lock, flags); - - /* When invoked from kvm_sched_out() we cannot sleep */ - if (state == RUNSTATE_runnable) - return; - - if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa, user_len)) - return; - - read_lock_irqsave(&gpc->lock, flags); - } + size_t times_ofs; + uint8_t *update_bit = NULL; + uint64_t entry_time; + uint64_t *rs_times; + int *rs_state; /* * The only difference between 32-bit and 64-bit versions of the - * runstate struct us the alignment of uint64_t in 32-bit, which + * runstate struct is the alignment of uint64_t in 32-bit, which * means that the 64-bit version has an additional 4 bytes of - * padding after the first field 'state'. - * - * So we use 'int __user *user_state' to point to the state field, - * and 'uint64_t __user *user_times' for runstate_entry_time. So - * the actual array of time[] in each state starts at user_times[1]. + * padding after the first field 'state'. Let's be really really + * paranoid about that, and matching it with our internal data + * structures that we memcpy into it... */ BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state) != 0); BUILD_BUG_ON(offsetof(struct compat_vcpu_runstate_info, state) != 0); BUILD_BUG_ON(sizeof(struct compat_vcpu_runstate_info) != 0x2c); #ifdef CONFIG_X86_64 + /* + * The 64-bit structure has 4 bytes of padding before 'state_entry_time' + * so each subsequent field is shifted by 4, and it's 4 bytes longer. + */ BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state_entry_time) != offsetof(struct compat_vcpu_runstate_info, state_entry_time) + 4); BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, time) != offsetof(struct compat_vcpu_runstate_info, time) + 4); + BUILD_BUG_ON(sizeof(struct vcpu_runstate_info) != 0x2c + 4); #endif - - user_state = gpc->khva; - - if (IS_ENABLED(CONFIG_64BIT) && v->kvm->arch.xen.long_mode) - user_times = gpc->khva + offsetof(struct vcpu_runstate_info, - state_entry_time); - else - user_times = gpc->khva + offsetof(struct compat_vcpu_runstate_info, - state_entry_time); - /* - * First write the updated state_entry_time at the appropriate - * location determined by 'offset'. - */ - BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, state_entry_time) != - sizeof(user_times[0])); - BUILD_BUG_ON(sizeof_field(struct compat_vcpu_runstate_info, state_entry_time) != - sizeof(user_times[0])); - - user_times[0] = vx->runstate_entry_time | XEN_RUNSTATE_UPDATE; - smp_wmb(); - - /* - * Next, write the new runstate. This is in the *same* place - * for 32-bit and 64-bit guests, asserted here for paranoia. + * The state field is in the same place at the start of both structs, + * and is the same size (int) as vx->current_runstate. */ BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state) != offsetof(struct compat_vcpu_runstate_info, state)); @@ -284,34 +216,238 @@ void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, int state) BUILD_BUG_ON(sizeof_field(struct compat_vcpu_runstate_info, state) != sizeof(vx->current_runstate)); - *user_state = vx->current_runstate; + /* + * The state_entry_time field is 64 bits in both versions, and the + * XEN_RUNSTATE_UPDATE flag is in the top bit, which given that x86 + * is little-endian means that it's in the last *byte* of the word. + * That detail is important later. + */ + BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, state_entry_time) != + sizeof(uint64_t)); + BUILD_BUG_ON(sizeof_field(struct compat_vcpu_runstate_info, state_entry_time) != + sizeof(uint64_t)); + BUILD_BUG_ON((XEN_RUNSTATE_UPDATE >> 56) != 0x80); /* - * Write the actual runstate times immediately after the - * runstate_entry_time. + * The time array is four 64-bit quantities in both versions, matching + * the vx->runstate_times and immediately following state_entry_time. */ BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state_entry_time) != - offsetof(struct vcpu_runstate_info, time) - sizeof(u64)); + offsetof(struct vcpu_runstate_info, time) - sizeof(uint64_t)); BUILD_BUG_ON(offsetof(struct compat_vcpu_runstate_info, state_entry_time) != - offsetof(struct compat_vcpu_runstate_info, time) - sizeof(u64)); + offsetof(struct compat_vcpu_runstate_info, time) - sizeof(uint64_t)); BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, time) != sizeof_field(struct compat_vcpu_runstate_info, time)); BUILD_BUG_ON(sizeof_field(struct vcpu_runstate_info, time) != sizeof(vx->runstate_times)); - memcpy(user_times + 1, vx->runstate_times, sizeof(vx->runstate_times)); - smp_wmb(); + if (IS_ENABLED(CONFIG_64BIT) && v->kvm->arch.xen.long_mode) { + user_len = sizeof(struct vcpu_runstate_info); + times_ofs = offsetof(struct vcpu_runstate_info, + state_entry_time); + } else { + user_len = sizeof(struct compat_vcpu_runstate_info); + times_ofs = offsetof(struct compat_vcpu_runstate_info, + state_entry_time); + } + + /* + * There are basically no alignment constraints. The guest can set it + * up so it crosses from one page to the next, and at arbitrary byte + * alignment (and the 32-bit ABI doesn't align the 64-bit integers + * anyway, even if the overall struct had been 64-bit aligned). + */ + if ((gpc1->gpa & ~PAGE_MASK) + user_len >= PAGE_SIZE) { + user_len1 = PAGE_SIZE - (gpc1->gpa & ~PAGE_MASK); + user_len2 = user_len - user_len1; + } else { + user_len1 = user_len; + user_len2 = 0; + } + BUG_ON(user_len1 + user_len2 != user_len); + + retry: + /* + * Attempt to obtain the GPC lock on *both* (if there are two) + * gfn_to_pfn caches that cover the region. + */ + read_lock_irqsave(&gpc1->lock, flags); + while (!kvm_gpc_check(gpc1, user_len1)) { + read_unlock_irqrestore(&gpc1->lock, flags); + + /* When invoked from kvm_sched_out() we cannot sleep */ + if (atomic) + return; + + if (kvm_gpc_refresh(gpc1, user_len1)) + return; + + read_lock_irqsave(&gpc1->lock, flags); + } + + if (likely(!user_len2)) { + /* + * Set up three pointers directly to the runstate_info + * struct in the guest (via the GPC). + * + * • @rs_state → state field + * • @rs_times → state_entry_time field. + * • @update_bit → last byte of state_entry_time, which + * contains the XEN_RUNSTATE_UPDATE bit. + */ + rs_state = gpc1->khva; + rs_times = gpc1->khva + times_ofs; + if (v->kvm->arch.xen.runstate_update_flag) + update_bit = ((void *)(&rs_times[1])) - 1; + } else { + /* + * The guest's runstate_info is split across two pages and we + * need to hold and validate both GPCs simultaneously. We can + * declare a lock ordering GPC1 > GPC2 because nothing else + * takes them more than one at a time. + */ + read_lock(&gpc2->lock); + + if (!kvm_gpc_check(gpc2, user_len2)) { + read_unlock(&gpc2->lock); + read_unlock_irqrestore(&gpc1->lock, flags); + + /* When invoked from kvm_sched_out() we cannot sleep */ + if (atomic) + return; + + /* + * Use kvm_gpc_activate() here because if the runstate + * area was configured in 32-bit mode and only extends + * to the second page now because the guest changed to + * 64-bit mode, the second GPC won't have been set up. + */ + if (kvm_gpc_activate(gpc2, gpc1->gpa + user_len1, + user_len2)) + return; + + /* + * We dropped the lock on GPC1 so we have to go all the + * way back and revalidate that too. + */ + goto retry; + } + + /* + * In this case, the runstate_info struct will be assembled on + * the kernel stack (compat or not as appropriate) and will + * be copied to GPC1/GPC2 with a dual memcpy. Set up the three + * rs pointers accordingly. + */ + rs_times = &rs.state_entry_time; + + /* + * The rs_state pointer points to the start of what we'll + * copy to the guest, which in the case of a compat guest + * is the 32-bit field that the compiler thinks is padding. + */ + rs_state = ((void *)rs_times) - times_ofs; + + /* + * The update_bit is still directly in the guest memory, + * via one GPC or the other. + */ + if (v->kvm->arch.xen.runstate_update_flag) { + if (user_len1 >= times_ofs + sizeof(uint64_t)) + update_bit = gpc1->khva + times_ofs + + sizeof(uint64_t) - 1; + else + update_bit = gpc2->khva + times_ofs + + sizeof(uint64_t) - 1 - user_len1; + } + +#ifdef CONFIG_X86_64 + /* + * Don't leak kernel memory through the padding in the 64-bit + * version of the struct. + */ + memset(&rs, 0, offsetof(struct vcpu_runstate_info, state_entry_time)); +#endif + } + + /* + * First, set the XEN_RUNSTATE_UPDATE bit in the top bit of the + * state_entry_time field, directly in the guest. We need to set + * that (and write-barrier) before writing to the rest of the + * structure, and clear it last. Just as Xen does, we address the + * single *byte* in which it resides because it might be in a + * different cache line to the rest of the 64-bit word, due to + * the (lack of) alignment constraints. + */ + entry_time = vx->runstate_entry_time; + if (update_bit) { + entry_time |= XEN_RUNSTATE_UPDATE; + *update_bit = (vx->runstate_entry_time | XEN_RUNSTATE_UPDATE) >> 56; + smp_wmb(); + } /* - * Finally, clear the XEN_RUNSTATE_UPDATE bit in the guest's - * runstate_entry_time field. + * Now assemble the actual structure, either on our kernel stack + * or directly in the guest according to how the rs_state and + * rs_times pointers were set up above. */ - user_times[0] &= ~XEN_RUNSTATE_UPDATE; + *rs_state = vx->current_runstate; + rs_times[0] = entry_time; + memcpy(rs_times + 1, vx->runstate_times, sizeof(vx->runstate_times)); + + /* For the split case, we have to then copy it to the guest. */ + if (user_len2) { + memcpy(gpc1->khva, rs_state, user_len1); + memcpy(gpc2->khva, ((void *)rs_state) + user_len1, user_len2); + } smp_wmb(); - read_unlock_irqrestore(&gpc->lock, flags); + /* Finally, clear the XEN_RUNSTATE_UPDATE bit. */ + if (update_bit) { + entry_time &= ~XEN_RUNSTATE_UPDATE; + *update_bit = entry_time >> 56; + smp_wmb(); + } - mark_page_dirty_in_slot(v->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT); + if (user_len2) + read_unlock(&gpc2->lock); + + read_unlock_irqrestore(&gpc1->lock, flags); + + mark_page_dirty_in_slot(v->kvm, gpc1->memslot, gpc1->gpa >> PAGE_SHIFT); + if (user_len2) + mark_page_dirty_in_slot(v->kvm, gpc2->memslot, gpc2->gpa >> PAGE_SHIFT); +} + +void kvm_xen_update_runstate(struct kvm_vcpu *v, int state) +{ + struct kvm_vcpu_xen *vx = &v->arch.xen; + u64 now = get_kvmclock_ns(v->kvm); + u64 delta_ns = now - vx->runstate_entry_time; + u64 run_delay = current->sched_info.run_delay; + + if (unlikely(!vx->runstate_entry_time)) + vx->current_runstate = RUNSTATE_offline; + + /* + * Time waiting for the scheduler isn't "stolen" if the + * vCPU wasn't running anyway. + */ + if (vx->current_runstate == RUNSTATE_running) { + u64 steal_ns = run_delay - vx->last_steal; + + delta_ns -= steal_ns; + + vx->runstate_times[RUNSTATE_runnable] += steal_ns; + } + vx->last_steal = run_delay; + + vx->runstate_times[vx->current_runstate] += delta_ns; + vx->current_runstate = state; + vx->runstate_entry_time = now; + + if (vx->runstate_cache.active) + kvm_xen_update_runstate_guest(v, state == RUNSTATE_runnable); } static void kvm_xen_inject_vcpu_vector(struct kvm_vcpu *v) @@ -352,12 +488,10 @@ void kvm_xen_inject_pending_events(struct kvm_vcpu *v) * little more honest about it. */ read_lock_irqsave(&gpc->lock, flags); - while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa, - sizeof(struct vcpu_info))) { + while (!kvm_gpc_check(gpc, sizeof(struct vcpu_info))) { read_unlock_irqrestore(&gpc->lock, flags); - if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa, - sizeof(struct vcpu_info))) + if (kvm_gpc_refresh(gpc, sizeof(struct vcpu_info))) return; read_lock_irqsave(&gpc->lock, flags); @@ -417,8 +551,7 @@ int __kvm_xen_has_interrupt(struct kvm_vcpu *v) sizeof_field(struct compat_vcpu_info, evtchn_upcall_pending)); read_lock_irqsave(&gpc->lock, flags); - while (!kvm_gfn_to_pfn_cache_check(v->kvm, gpc, gpc->gpa, - sizeof(struct vcpu_info))) { + while (!kvm_gpc_check(gpc, sizeof(struct vcpu_info))) { read_unlock_irqrestore(&gpc->lock, flags); /* @@ -432,8 +565,7 @@ int __kvm_xen_has_interrupt(struct kvm_vcpu *v) if (in_atomic() || !task_is_running(current)) return 1; - if (kvm_gfn_to_pfn_cache_refresh(v->kvm, gpc, gpc->gpa, - sizeof(struct vcpu_info))) { + if (kvm_gpc_refresh(gpc, sizeof(struct vcpu_info))) { /* * If this failed, userspace has screwed up the * vcpu_info mapping. No interrupts for you. @@ -493,6 +625,17 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) r = 0; break; + case KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG: + if (!sched_info_on()) { + r = -EOPNOTSUPP; + break; + } + mutex_lock(&kvm->lock); + kvm->arch.xen.runstate_update_flag = !!data->u.runstate_update_flag; + mutex_unlock(&kvm->lock); + r = 0; + break; + default: break; } @@ -530,6 +673,15 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) r = 0; break; + case KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG: + if (!sched_info_on()) { + r = -EOPNOTSUPP; + break; + } + data->u.runstate_update_flag = kvm->arch.xen.runstate_update_flag; + r = 0; + break; + default: break; } @@ -554,15 +706,13 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data) offsetof(struct compat_vcpu_info, time)); if (data->u.gpa == GPA_INVALID) { - kvm_gpc_deactivate(vcpu->kvm, &vcpu->arch.xen.vcpu_info_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.vcpu_info_cache); r = 0; break; } - r = kvm_gpc_activate(vcpu->kvm, - &vcpu->arch.xen.vcpu_info_cache, NULL, - KVM_HOST_USES_PFN, data->u.gpa, - sizeof(struct vcpu_info)); + r = kvm_gpc_activate(&vcpu->arch.xen.vcpu_info_cache, + data->u.gpa, sizeof(struct vcpu_info)); if (!r) kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); @@ -570,37 +720,65 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data) case KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO: if (data->u.gpa == GPA_INVALID) { - kvm_gpc_deactivate(vcpu->kvm, - &vcpu->arch.xen.vcpu_time_info_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.vcpu_time_info_cache); r = 0; break; } - r = kvm_gpc_activate(vcpu->kvm, - &vcpu->arch.xen.vcpu_time_info_cache, - NULL, KVM_HOST_USES_PFN, data->u.gpa, + r = kvm_gpc_activate(&vcpu->arch.xen.vcpu_time_info_cache, + data->u.gpa, sizeof(struct pvclock_vcpu_time_info)); if (!r) kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); break; - case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR: + case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR: { + size_t sz, sz1, sz2; + if (!sched_info_on()) { r = -EOPNOTSUPP; break; } if (data->u.gpa == GPA_INVALID) { - kvm_gpc_deactivate(vcpu->kvm, - &vcpu->arch.xen.runstate_cache); r = 0; + deactivate_out: + kvm_gpc_deactivate(&vcpu->arch.xen.runstate_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.runstate2_cache); break; } - r = kvm_gpc_activate(vcpu->kvm, &vcpu->arch.xen.runstate_cache, - NULL, KVM_HOST_USES_PFN, data->u.gpa, - sizeof(struct vcpu_runstate_info)); - break; + /* + * If the guest switches to 64-bit mode after setting the runstate + * address, that's actually OK. kvm_xen_update_runstate_guest() + * will cope. + */ + if (IS_ENABLED(CONFIG_64BIT) && vcpu->kvm->arch.xen.long_mode) + sz = sizeof(struct vcpu_runstate_info); + else + sz = sizeof(struct compat_vcpu_runstate_info); + + /* How much fits in the (first) page? */ + sz1 = PAGE_SIZE - (data->u.gpa & ~PAGE_MASK); + r = kvm_gpc_activate(&vcpu->arch.xen.runstate_cache, + data->u.gpa, sz1); + if (r) + goto deactivate_out; + + /* Either map the second page, or deactivate the second GPC */ + if (sz1 >= sz) { + kvm_gpc_deactivate(&vcpu->arch.xen.runstate2_cache); + } else { + sz2 = sz - sz1; + BUG_ON((data->u.gpa + sz1) & ~PAGE_MASK); + r = kvm_gpc_activate(&vcpu->arch.xen.runstate2_cache, + data->u.gpa + sz1, sz2); + if (r) + goto deactivate_out; + } + kvm_xen_update_runstate_guest(vcpu, false); + break; + } case KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT: if (!sched_info_on()) { r = -EOPNOTSUPP; @@ -693,6 +871,8 @@ int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data) if (data->u.runstate.state <= RUNSTATE_offline) kvm_xen_update_runstate(vcpu, data->u.runstate.state); + else if (vcpu->arch.xen.runstate_cache.active) + kvm_xen_update_runstate_guest(vcpu, false); r = 0; break; @@ -972,9 +1152,9 @@ static bool wait_pending_event(struct kvm_vcpu *vcpu, int nr_ports, bool ret = true; int idx, i; - read_lock_irqsave(&gpc->lock, flags); idx = srcu_read_lock(&kvm->srcu); - if (!kvm_gfn_to_pfn_cache_check(kvm, gpc, gpc->gpa, PAGE_SIZE)) + read_lock_irqsave(&gpc->lock, flags); + if (!kvm_gpc_check(gpc, PAGE_SIZE)) goto out_rcu; ret = false; @@ -994,8 +1174,8 @@ static bool wait_pending_event(struct kvm_vcpu *vcpu, int nr_ports, } out_rcu: - srcu_read_unlock(&kvm->srcu, idx); read_unlock_irqrestore(&gpc->lock, flags); + srcu_read_unlock(&kvm->srcu, idx); return ret; } @@ -1008,20 +1188,45 @@ static bool kvm_xen_schedop_poll(struct kvm_vcpu *vcpu, bool longmode, evtchn_port_t port, *ports; gpa_t gpa; - if (!longmode || !lapic_in_kernel(vcpu) || + if (!lapic_in_kernel(vcpu) || !(vcpu->kvm->arch.xen_hvm_config.flags & KVM_XEN_HVM_CONFIG_EVTCHN_SEND)) return false; idx = srcu_read_lock(&vcpu->kvm->srcu); gpa = kvm_mmu_gva_to_gpa_system(vcpu, param, NULL); srcu_read_unlock(&vcpu->kvm->srcu, idx); - - if (!gpa || kvm_vcpu_read_guest(vcpu, gpa, &sched_poll, - sizeof(sched_poll))) { + if (!gpa) { *r = -EFAULT; return true; } + if (IS_ENABLED(CONFIG_64BIT) && !longmode) { + struct compat_sched_poll sp32; + + /* Sanity check that the compat struct definition is correct */ + BUILD_BUG_ON(sizeof(sp32) != 16); + + if (kvm_vcpu_read_guest(vcpu, gpa, &sp32, sizeof(sp32))) { + *r = -EFAULT; + return true; + } + + /* + * This is a 32-bit pointer to an array of evtchn_port_t which + * are uint32_t, so once it's converted no further compat + * handling is needed. + */ + sched_poll.ports = (void *)(unsigned long)(sp32.ports); + sched_poll.nr_ports = sp32.nr_ports; + sched_poll.timeout = sp32.timeout; + } else { + if (kvm_vcpu_read_guest(vcpu, gpa, &sched_poll, + sizeof(sched_poll))) { + *r = -EFAULT; + return true; + } + } + if (unlikely(sched_poll.nr_ports > 1)) { /* Xen (unofficially) limits number of pollers to 128 */ if (sched_poll.nr_ports > 128) { @@ -1256,7 +1461,7 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) } #endif cpl = static_call(kvm_x86_get_cpl)(vcpu); - trace_kvm_xen_hypercall(input, params[0], params[1], params[2], + trace_kvm_xen_hypercall(cpl, input, params[0], params[1], params[2], params[3], params[4], params[5]); /* @@ -1371,7 +1576,7 @@ int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe, struct kvm *kvm) idx = srcu_read_lock(&kvm->srcu); read_lock_irqsave(&gpc->lock, flags); - if (!kvm_gfn_to_pfn_cache_check(kvm, gpc, gpc->gpa, PAGE_SIZE)) + if (!kvm_gpc_check(gpc, PAGE_SIZE)) goto out_rcu; if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) { @@ -1405,7 +1610,7 @@ int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe, struct kvm *kvm) gpc = &vcpu->arch.xen.vcpu_info_cache; read_lock_irqsave(&gpc->lock, flags); - if (!kvm_gfn_to_pfn_cache_check(kvm, gpc, gpc->gpa, sizeof(struct vcpu_info))) { + if (!kvm_gpc_check(gpc, sizeof(struct vcpu_info))) { /* * Could not access the vcpu_info. Set the bit in-kernel * and prod the vCPU to deliver it for itself. @@ -1503,7 +1708,7 @@ static int kvm_xen_set_evtchn(struct kvm_xen_evtchn *xe, struct kvm *kvm) break; idx = srcu_read_lock(&kvm->srcu); - rc = kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpc->gpa, PAGE_SIZE); + rc = kvm_gpc_refresh(gpc, PAGE_SIZE); srcu_read_unlock(&kvm->srcu, idx); } while(!rc); @@ -1833,9 +2038,14 @@ void kvm_xen_init_vcpu(struct kvm_vcpu *vcpu) timer_setup(&vcpu->arch.xen.poll_timer, cancel_evtchn_poll, 0); - kvm_gpc_init(&vcpu->arch.xen.runstate_cache); - kvm_gpc_init(&vcpu->arch.xen.vcpu_info_cache); - kvm_gpc_init(&vcpu->arch.xen.vcpu_time_info_cache); + kvm_gpc_init(&vcpu->arch.xen.runstate_cache, vcpu->kvm, NULL, + KVM_HOST_USES_PFN); + kvm_gpc_init(&vcpu->arch.xen.runstate2_cache, vcpu->kvm, NULL, + KVM_HOST_USES_PFN); + kvm_gpc_init(&vcpu->arch.xen.vcpu_info_cache, vcpu->kvm, NULL, + KVM_HOST_USES_PFN); + kvm_gpc_init(&vcpu->arch.xen.vcpu_time_info_cache, vcpu->kvm, NULL, + KVM_HOST_USES_PFN); } void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu) @@ -1843,9 +2053,10 @@ void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu) if (kvm_xen_timer_enabled(vcpu)) kvm_xen_stop_timer(vcpu); - kvm_gpc_deactivate(vcpu->kvm, &vcpu->arch.xen.runstate_cache); - kvm_gpc_deactivate(vcpu->kvm, &vcpu->arch.xen.vcpu_info_cache); - kvm_gpc_deactivate(vcpu->kvm, &vcpu->arch.xen.vcpu_time_info_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.runstate_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.runstate2_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.vcpu_info_cache); + kvm_gpc_deactivate(&vcpu->arch.xen.vcpu_time_info_cache); del_timer_sync(&vcpu->arch.xen.poll_timer); } @@ -1853,7 +2064,7 @@ void kvm_xen_destroy_vcpu(struct kvm_vcpu *vcpu) void kvm_xen_init_vm(struct kvm *kvm) { idr_init(&kvm->arch.xen.evtchn_ports); - kvm_gpc_init(&kvm->arch.xen.shinfo_cache); + kvm_gpc_init(&kvm->arch.xen.shinfo_cache, kvm, NULL, KVM_HOST_USES_PFN); } void kvm_xen_destroy_vm(struct kvm *kvm) @@ -1861,7 +2072,7 @@ void kvm_xen_destroy_vm(struct kvm *kvm) struct evtchnfd *evtchnfd; int i; - kvm_gpc_deactivate(kvm, &kvm->arch.xen.shinfo_cache); + kvm_gpc_deactivate(&kvm->arch.xen.shinfo_cache); idr_for_each_entry(&kvm->arch.xen.evtchn_ports, evtchnfd, i) { if (!evtchnfd->deliver.port.port) diff --git a/arch/x86/kvm/xen.h b/arch/x86/kvm/xen.h index 532a535a9e99..ea33d80a0c51 100644 --- a/arch/x86/kvm/xen.h +++ b/arch/x86/kvm/xen.h @@ -143,11 +143,11 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu); #include <asm/xen/interface.h> #include <xen/interface/vcpu.h> -void kvm_xen_update_runstate_guest(struct kvm_vcpu *vcpu, int state); +void kvm_xen_update_runstate(struct kvm_vcpu *vcpu, int state); static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu) { - kvm_xen_update_runstate_guest(vcpu, RUNSTATE_running); + kvm_xen_update_runstate(vcpu, RUNSTATE_running); } static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu) @@ -162,7 +162,7 @@ static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu) if (WARN_ON_ONCE(!vcpu->preempted)) return; - kvm_xen_update_runstate_guest(vcpu, RUNSTATE_runnable); + kvm_xen_update_runstate(vcpu, RUNSTATE_runnable); } /* 32-bit compatibility definitions, also used natively in 32-bit build */ @@ -207,4 +207,11 @@ struct compat_vcpu_runstate_info { uint64_t time[4]; } __attribute__((packed)); +struct compat_sched_poll { + /* This is actually a guest virtual address which points to ports. */ + uint32_t ports; + unsigned int nr_ports; + uint64_t timeout; +}; + #endif /* __ARCH_X86_KVM_XEN_H__ */ diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 68eeb25fb661..9720aed2ac27 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -429,7 +429,7 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q, aqic_gisa.isc = nisc; aqic_gisa.ir = 1; - aqic_gisa.gisa = (uint64_t)gisa >> 4; + aqic_gisa.gisa = virt_to_phys(gisa) >> 4; status = ap_aqic(q->apqn, aqic_gisa, h_nib); switch (status.response_code) { diff --git a/fs/proc/page.c b/fs/proc/page.c index f2273b164535..6249c347809a 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -219,8 +219,9 @@ u64 stable_page_flags(struct page *page) u |= kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2); u |= kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1); u |= kpf_copy_bit(k, KPF_ARCH, PG_arch_1); -#ifdef CONFIG_64BIT +#ifdef CONFIG_ARCH_USES_PG_ARCH_X u |= kpf_copy_bit(k, KPF_ARCH_2, PG_arch_2); + u |= kpf_copy_bit(k, KPF_ARCH_3, PG_arch_3); #endif return u; diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h index b17c6eeb9afa..e29ccabf2e09 100644 --- a/include/asm-generic/hyperv-tlfs.h +++ b/include/asm-generic/hyperv-tlfs.h @@ -408,6 +408,11 @@ struct hv_vpset { u64 bank_contents[]; } __packed; +/* The maximum number of sparse vCPU banks which can be encoded by 'struct hv_vpset' */ +#define HV_MAX_SPARSE_VCPU_BANKS (64) +/* The number of vCPUs in one sparse bank */ +#define HV_VCPUS_PER_SPARSE_BANK (64) + /* HvCallSendSyntheticClusterIpi hypercall */ struct hv_send_ipi { u32 vector; diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index bfb9eb9d7215..d55d2833a37b 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -211,9 +211,10 @@ static inline int __cpumask_to_vpset(struct hv_vpset *vpset, { int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1; int this_cpu = smp_processor_id(); + int max_vcpu_bank = hv_max_vp_index / HV_VCPUS_PER_SPARSE_BANK; - /* valid_bank_mask can represent up to 64 banks */ - if (hv_max_vp_index / 64 >= 64) + /* vpset.valid_bank_mask can represent up to HV_MAX_SPARSE_VCPU_BANKS banks */ + if (max_vcpu_bank >= HV_MAX_SPARSE_VCPU_BANKS) return 0; /* @@ -221,7 +222,7 @@ static inline int __cpumask_to_vpset(struct hv_vpset *vpset, * structs are not cleared between calls, we risk flushing unneeded * vCPUs otherwise. */ - for (vcpu_bank = 0; vcpu_bank <= hv_max_vp_index / 64; vcpu_bank++) + for (vcpu_bank = 0; vcpu_bank <= max_vcpu_bank; vcpu_bank++) vpset->bank_contents[vcpu_bank] = 0; /* @@ -233,8 +234,8 @@ static inline int __cpumask_to_vpset(struct hv_vpset *vpset, vcpu = hv_cpu_number_to_vp_number(cpu); if (vcpu == VP_INVAL) return -1; - vcpu_bank = vcpu / 64; - vcpu_offset = vcpu % 64; + vcpu_bank = vcpu / HV_VCPUS_PER_SPARSE_BANK; + vcpu_offset = vcpu % HV_VCPUS_PER_SPARSE_BANK; __set_bit(vcpu_offset, (unsigned long *) &vpset->bank_contents[vcpu_bank]); if (vcpu_bank >= nr_bank) diff --git a/include/kvm/arm_pmu.h b/include/kvm/arm_pmu.h index c0b868ce6a8f..628775334d5e 100644 --- a/include/kvm/arm_pmu.h +++ b/include/kvm/arm_pmu.h @@ -11,7 +11,6 @@ #include <asm/perf_event.h> #define ARMV8_PMU_CYCLE_IDX (ARMV8_PMU_MAX_COUNTERS - 1) -#define ARMV8_PMU_MAX_COUNTER_PAIRS ((ARMV8_PMU_MAX_COUNTERS + 1) >> 1) #ifdef CONFIG_HW_PERF_EVENTS @@ -29,7 +28,6 @@ struct kvm_pmu { struct irq_work overflow_work; struct kvm_pmu_events events; struct kvm_pmc pmc[ARMV8_PMU_MAX_COUNTERS]; - DECLARE_BITMAP(chained, ARMV8_PMU_MAX_COUNTER_PAIRS); int irq_num; bool created; bool irq_level; @@ -91,6 +89,14 @@ void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu); vcpu->arch.pmu.events = *kvm_get_pmu_events(); \ } while (0) +/* + * Evaluates as true when emulating PMUv3p5, and false otherwise. + */ +#define kvm_pmu_is_3p5(vcpu) \ + (vcpu->kvm->arch.dfr0_pmuver.imp >= ID_AA64DFR0_EL1_PMUVer_V3P5) + +u8 kvm_arm_pmu_get_pmuver_limit(void); + #else struct kvm_pmu { }; @@ -153,9 +159,14 @@ static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) } #define kvm_vcpu_has_pmu(vcpu) ({ false; }) +#define kvm_pmu_is_3p5(vcpu) ({ false; }) static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {} static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {} static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {} +static inline u8 kvm_arm_pmu_get_pmuver_limit(void) +{ + return 0; +} #endif diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 4df9e73a8bb5..9270cd87da3f 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -263,6 +263,7 @@ struct vgic_dist { struct vgic_io_device dist_iodev; bool has_its; + bool save_its_tables_in_progress; /* * Contains the attributes and gpa of the LPI configuration table. diff --git a/include/linux/build_bug.h b/include/linux/build_bug.h index e3a0be2c90ad..3aa3640f8c18 100644 --- a/include/linux/build_bug.h +++ b/include/linux/build_bug.h @@ -77,4 +77,13 @@ #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) #define __static_assert(expr, msg, ...) _Static_assert(expr, msg) + +/* + * Compile time check that field has an expected offset + */ +#define ASSERT_STRUCT_OFFSET(type, field, expected_offset) \ + BUILD_BUG_ON_MSG(offsetof(type, field) != (expected_offset), \ + "Offset of " #field " in " #type " has changed.") + + #endif /* _LINUX_BUILD_BUG_H */ diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-page-flags.h index eee1877a354e..859f4b0c1b2b 100644 --- a/include/linux/kernel-page-flags.h +++ b/include/linux/kernel-page-flags.h @@ -18,5 +18,6 @@ #define KPF_UNCACHED 39 #define KPF_SOFTDIRTY 40 #define KPF_ARCH_2 41 +#define KPF_ARCH_3 42 #endif /* LINUX_KERNEL_PAGE_FLAGS_H */ diff --git a/include/linux/kvm_dirty_ring.h b/include/linux/kvm_dirty_ring.h index 906f899813dc..4862c98d80d3 100644 --- a/include/linux/kvm_dirty_ring.h +++ b/include/linux/kvm_dirty_ring.h @@ -37,6 +37,11 @@ static inline u32 kvm_dirty_ring_get_rsvd_entries(void) return 0; } +static inline bool kvm_use_dirty_bitmap(struct kvm *kvm) +{ + return true; +} + static inline int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size) { @@ -49,7 +54,7 @@ static inline int kvm_dirty_ring_reset(struct kvm *kvm, return 0; } -static inline void kvm_dirty_ring_push(struct kvm_dirty_ring *ring, +static inline void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset) { } @@ -64,13 +69,11 @@ static inline void kvm_dirty_ring_free(struct kvm_dirty_ring *ring) { } -static inline bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring) -{ - return true; -} - #else /* CONFIG_HAVE_KVM_DIRTY_RING */ +int kvm_cpu_dirty_log_size(void); +bool kvm_use_dirty_bitmap(struct kvm *kvm); +bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm); u32 kvm_dirty_ring_get_rsvd_entries(void); int kvm_dirty_ring_alloc(struct kvm_dirty_ring *ring, int index, u32 size); @@ -84,13 +87,14 @@ int kvm_dirty_ring_reset(struct kvm *kvm, struct kvm_dirty_ring *ring); * returns =0: successfully pushed * <0: unable to push, need to wait */ -void kvm_dirty_ring_push(struct kvm_dirty_ring *ring, u32 slot, u64 offset); +void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset); + +bool kvm_dirty_ring_check_request(struct kvm_vcpu *vcpu); /* for use in vm_operations_struct */ struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset); void kvm_dirty_ring_free(struct kvm_dirty_ring *ring); -bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring); #endif /* CONFIG_HAVE_KVM_DIRTY_RING */ diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 915142abdf76..4f26b244f6d0 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -50,8 +50,8 @@ #endif /* - * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used - * in kvm, other bits are visible for userspace which are defined in + * The bit 16 ~ bit 31 of kvm_userspace_memory_region::flags are internally + * used in kvm, other bits are visible for userspace which are defined in * include/linux/kvm_h. */ #define KVM_MEMSLOT_INVALID (1UL << 16) @@ -96,6 +96,7 @@ #define KVM_PFN_ERR_FAULT (KVM_PFN_ERR_MASK) #define KVM_PFN_ERR_HWPOISON (KVM_PFN_ERR_MASK + 1) #define KVM_PFN_ERR_RO_FAULT (KVM_PFN_ERR_MASK + 2) +#define KVM_PFN_ERR_SIGPENDING (KVM_PFN_ERR_MASK + 3) /* * error pfns indicate that the gfn is in slot but faild to @@ -107,6 +108,15 @@ static inline bool is_error_pfn(kvm_pfn_t pfn) } /* + * KVM_PFN_ERR_SIGPENDING indicates that fetching the PFN was interrupted + * by a pending signal. Note, the signal may or may not be fatal. + */ +static inline bool is_sigpending_pfn(kvm_pfn_t pfn) +{ + return pfn == KVM_PFN_ERR_SIGPENDING; +} + +/* * error_noslot pfns indicate that the gfn can not be * translated to pfn - it is not in slot or failed to * translate it to pfn. @@ -153,10 +163,11 @@ static inline bool is_error_page(struct page *page) * Architecture-independent vcpu->requests bit members * Bits 3-7 are reserved for more arch-independent bits. */ -#define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) -#define KVM_REQ_VM_DEAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) -#define KVM_REQ_UNBLOCK 2 -#define KVM_REQUEST_ARCH_BASE 8 +#define KVM_REQ_TLB_FLUSH (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_VM_DEAD (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_UNBLOCK 2 +#define KVM_REQ_DIRTY_RING_SOFT_FULL 3 +#define KVM_REQUEST_ARCH_BASE 8 /* * KVM_REQ_OUTSIDE_GUEST_MODE exists is purely as way to force the vCPU to @@ -655,6 +666,8 @@ struct kvm_irq_routing_table { }; #endif +bool kvm_arch_irqchip_in_kernel(struct kvm *kvm); + #ifndef KVM_INTERNAL_MEM_SLOTS #define KVM_INTERNAL_MEM_SLOTS 0 #endif @@ -710,6 +723,11 @@ struct kvm { /* The current active memslot set for each address space */ struct kvm_memslots __rcu *memslots[KVM_ADDRESS_SPACE_NUM]; struct xarray vcpu_array; + /* + * Protected by slots_lock, but can be read outside if an + * incorrect answer is acceptable. + */ + atomic_t nr_memslots_dirty_logging; /* Used to wait for completion of MMU notifiers. */ spinlock_t mn_invalidate_lock; @@ -779,6 +797,7 @@ struct kvm { bool override_halt_poll_ns; unsigned int max_halt_poll_ns; u32 dirty_ring_size; + bool dirty_ring_with_bitmap; bool vm_bugged; bool vm_dead; @@ -1141,8 +1160,8 @@ kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, kvm_pfn_t gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn); kvm_pfn_t gfn_to_pfn_memslot_atomic(const struct kvm_memory_slot *slot, gfn_t gfn); kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn, - bool atomic, bool *async, bool write_fault, - bool *writable, hva_t *hva); + bool atomic, bool interruptible, bool *async, + bool write_fault, bool *writable, hva_t *hva); void kvm_release_pfn_clean(kvm_pfn_t pfn); void kvm_release_pfn_dirty(kvm_pfn_t pfn); @@ -1244,18 +1263,7 @@ void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn); * kvm_gpc_init - initialize gfn_to_pfn_cache. * * @gpc: struct gfn_to_pfn_cache object. - * - * This sets up a gfn_to_pfn_cache by initializing locks. Note, the cache must - * be zero-allocated (or zeroed by the caller before init). - */ -void kvm_gpc_init(struct gfn_to_pfn_cache *gpc); - -/** - * kvm_gpc_activate - prepare a cached kernel mapping and HPA for a given guest - * physical address. - * * @kvm: pointer to kvm instance. - * @gpc: struct gfn_to_pfn_cache object. * @vcpu: vCPU to be used for marking pages dirty and to be woken on * invalidation. * @usage: indicates if the resulting host physical PFN is used while @@ -1264,28 +1272,36 @@ void kvm_gpc_init(struct gfn_to_pfn_cache *gpc); * changes!---will also force @vcpu to exit the guest and * refresh the cache); and/or if the PFN used directly * by KVM (and thus needs a kernel virtual mapping). + * + * This sets up a gfn_to_pfn_cache by initializing locks and assigning the + * immutable attributes. Note, the cache must be zero-allocated (or zeroed by + * the caller before init). + */ +void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm, + struct kvm_vcpu *vcpu, enum pfn_cache_usage usage); + +/** + * kvm_gpc_activate - prepare a cached kernel mapping and HPA for a given guest + * physical address. + * + * @gpc: struct gfn_to_pfn_cache object. * @gpa: guest physical address to map. * @len: sanity check; the range being access must fit a single page. * * @return: 0 for success. * -EINVAL for a mapping which would cross a page boundary. - * -EFAULT for an untranslatable guest physical address. + * -EFAULT for an untranslatable guest physical address. * - * This primes a gfn_to_pfn_cache and links it into the @kvm's list for - * invalidations to be processed. Callers are required to use - * kvm_gfn_to_pfn_cache_check() to ensure that the cache is valid before - * accessing the target page. + * This primes a gfn_to_pfn_cache and links it into the @gpc->kvm's list for + * invalidations to be processed. Callers are required to use kvm_gpc_check() + * to ensure that the cache is valid before accessing the target page. */ -int kvm_gpc_activate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, - struct kvm_vcpu *vcpu, enum pfn_cache_usage usage, - gpa_t gpa, unsigned long len); +int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len); /** - * kvm_gfn_to_pfn_cache_check - check validity of a gfn_to_pfn_cache. + * kvm_gpc_check - check validity of a gfn_to_pfn_cache. * - * @kvm: pointer to kvm instance. * @gpc: struct gfn_to_pfn_cache object. - * @gpa: current guest physical address to map. * @len: sanity check; the range being access must fit a single page. * * @return: %true if the cache is still valid and the address matches. @@ -1298,52 +1314,35 @@ int kvm_gpc_activate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, * Callers in IN_GUEST_MODE may do so without locking, although they should * still hold a read lock on kvm->scru for the memslot checks. */ -bool kvm_gfn_to_pfn_cache_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, - gpa_t gpa, unsigned long len); +bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len); /** - * kvm_gfn_to_pfn_cache_refresh - update a previously initialized cache. + * kvm_gpc_refresh - update a previously initialized cache. * - * @kvm: pointer to kvm instance. * @gpc: struct gfn_to_pfn_cache object. - * @gpa: updated guest physical address to map. * @len: sanity check; the range being access must fit a single page. * * @return: 0 for success. * -EINVAL for a mapping which would cross a page boundary. - * -EFAULT for an untranslatable guest physical address. + * -EFAULT for an untranslatable guest physical address. * * This will attempt to refresh a gfn_to_pfn_cache. Note that a successful - * returm from this function does not mean the page can be immediately + * return from this function does not mean the page can be immediately * accessed because it may have raced with an invalidation. Callers must * still lock and check the cache status, as this function does not return * with the lock still held to permit access. */ -int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, - gpa_t gpa, unsigned long len); - -/** - * kvm_gfn_to_pfn_cache_unmap - temporarily unmap a gfn_to_pfn_cache. - * - * @kvm: pointer to kvm instance. - * @gpc: struct gfn_to_pfn_cache object. - * - * This unmaps the referenced page. The cache is left in the invalid state - * but at least the mapping from GPA to userspace HVA will remain cached - * and can be reused on a subsequent refresh. - */ -void kvm_gfn_to_pfn_cache_unmap(struct kvm *kvm, struct gfn_to_pfn_cache *gpc); +int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len); /** * kvm_gpc_deactivate - deactivate and unlink a gfn_to_pfn_cache. * - * @kvm: pointer to kvm instance. * @gpc: struct gfn_to_pfn_cache object. * - * This removes a cache from the @kvm's list to be processed on MMU notifier + * This removes a cache from the VM's list to be processed on MMU notifier * invocation. */ -void kvm_gpc_deactivate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc); +void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc); void kvm_sigset_activate(struct kvm_vcpu *vcpu); void kvm_sigset_deactivate(struct kvm_vcpu *vcpu); diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h index 3ca3db020e0e..76de36e56cdf 100644 --- a/include/linux/kvm_types.h +++ b/include/linux/kvm_types.h @@ -67,6 +67,7 @@ struct gfn_to_pfn_cache { gpa_t gpa; unsigned long uhva; struct kvm_memory_slot *memslot; + struct kvm *kvm; struct kvm_vcpu *vcpu; struct list_head list; rwlock_t lock; diff --git a/include/linux/mm.h b/include/linux/mm.h index 8178fe894e2e..f3f196e4d66d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3088,6 +3088,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address, #define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */ #define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */ #define FOLL_PCI_P2PDMA 0x100000 /* allow returning PCI P2PDMA pages */ +#define FOLL_INTERRUPTIBLE 0x200000 /* allow interrupts from generic signals */ /* * FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 9aec9fd8c50b..69e93a0c1277 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -132,8 +132,9 @@ enum pageflags { PG_young, PG_idle, #endif -#ifdef CONFIG_64BIT +#ifdef CONFIG_ARCH_USES_PG_ARCH_X PG_arch_2, + PG_arch_3, #endif #ifdef CONFIG_KASAN_HW_TAGS PG_skip_kasan_poison, diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index e87cb2b80ed3..412b5a46374c 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -91,10 +91,10 @@ #define IF_HAVE_PG_IDLE(flag,string) #endif -#ifdef CONFIG_64BIT -#define IF_HAVE_PG_ARCH_2(flag,string) ,{1UL << flag, string} +#ifdef CONFIG_ARCH_USES_PG_ARCH_X +#define IF_HAVE_PG_ARCH_X(flag,string) ,{1UL << flag, string} #else -#define IF_HAVE_PG_ARCH_2(flag,string) +#define IF_HAVE_PG_ARCH_X(flag,string) #endif #ifdef CONFIG_KASAN_HW_TAGS @@ -130,7 +130,8 @@ IF_HAVE_PG_UNCACHED(PG_uncached, "uncached" ) \ IF_HAVE_PG_HWPOISON(PG_hwpoison, "hwpoison" ) \ IF_HAVE_PG_IDLE(PG_young, "young" ) \ IF_HAVE_PG_IDLE(PG_idle, "idle" ) \ -IF_HAVE_PG_ARCH_2(PG_arch_2, "arch_2" ) \ +IF_HAVE_PG_ARCH_X(PG_arch_2, "arch_2" ) \ +IF_HAVE_PG_ARCH_X(PG_arch_3, "arch_3" ) \ IF_HAVE_PG_SKIP_KASAN_POISON(PG_skip_kasan_poison, "skip_kasan_poison") #define show_page_flags(flags) \ diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 0d5d4419139a..20522d4ba1e0 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -86,14 +86,6 @@ struct kvm_debug_guest { /* *** End of deprecated interfaces *** */ -/* for KVM_CREATE_MEMORY_REGION */ -struct kvm_memory_region { - __u32 slot; - __u32 flags; - __u64 guest_phys_addr; - __u64 memory_size; /* bytes */ -}; - /* for KVM_SET_USER_MEMORY_REGION */ struct kvm_userspace_memory_region { __u32 slot; @@ -104,9 +96,9 @@ struct kvm_userspace_memory_region { }; /* - * The bit 0 ~ bit 15 of kvm_memory_region::flags are visible for userspace, - * other bits are reserved for kvm internal use which are defined in - * include/linux/kvm_host.h. + * The bit 0 ~ bit 15 of kvm_userspace_memory_region::flags are visible for + * userspace, other bits are reserved for kvm internal use which are defined + * in include/linux/kvm_host.h. */ #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) #define KVM_MEM_READONLY (1UL << 1) @@ -485,6 +477,9 @@ struct kvm_run { #define KVM_MSR_EXIT_REASON_INVAL (1 << 0) #define KVM_MSR_EXIT_REASON_UNKNOWN (1 << 1) #define KVM_MSR_EXIT_REASON_FILTER (1 << 2) +#define KVM_MSR_EXIT_REASON_VALID_MASK (KVM_MSR_EXIT_REASON_INVAL | \ + KVM_MSR_EXIT_REASON_UNKNOWN | \ + KVM_MSR_EXIT_REASON_FILTER) __u32 reason; /* kernel -> user */ __u32 index; /* kernel -> user */ __u64 data; /* kernel <-> user */ @@ -1178,6 +1173,8 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_S390_ZPCI_OP 221 #define KVM_CAP_S390_CPU_TOPOLOGY 222 #define KVM_CAP_DIRTY_LOG_RING_ACQ_REL 223 +#define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 224 +#define KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP 225 #ifdef KVM_CAP_IRQ_ROUTING @@ -1267,6 +1264,7 @@ struct kvm_x86_mce { #define KVM_XEN_HVM_CONFIG_RUNSTATE (1 << 3) #define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4) #define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5) +#define KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG (1 << 6) struct kvm_xen_hvm_config { __u32 flags; @@ -1438,17 +1436,11 @@ struct kvm_vfio_spapr_tce { }; /* - * ioctls for VM fds - */ -#define KVM_SET_MEMORY_REGION _IOW(KVMIO, 0x40, struct kvm_memory_region) -/* * KVM_CREATE_VCPU receives as a parameter the vcpu slot, and returns * a vcpu fd. */ #define KVM_CREATE_VCPU _IO(KVMIO, 0x41) #define KVM_GET_DIRTY_LOG _IOW(KVMIO, 0x42, struct kvm_dirty_log) -/* KVM_SET_MEMORY_ALIAS is obsolete: */ -#define KVM_SET_MEMORY_ALIAS _IOW(KVMIO, 0x43, struct kvm_memory_alias) #define KVM_SET_NR_MMU_PAGES _IO(KVMIO, 0x44) #define KVM_GET_NR_MMU_PAGES _IO(KVMIO, 0x45) #define KVM_SET_USER_MEMORY_REGION _IOW(KVMIO, 0x46, \ @@ -1740,6 +1732,8 @@ enum pv_cmd_id { KVM_PV_UNSHARE_ALL, KVM_PV_INFO, KVM_PV_DUMP, + KVM_PV_ASYNC_CLEANUP_PREPARE, + KVM_PV_ASYNC_CLEANUP_PERFORM, }; struct kvm_pv_cmd { @@ -1770,6 +1764,7 @@ struct kvm_xen_hvm_attr { union { __u8 long_mode; __u8 vector; + __u8 runstate_update_flag; struct { __u64 gfn; } shared_info; @@ -1810,6 +1805,8 @@ struct kvm_xen_hvm_attr { /* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND */ #define KVM_XEN_ATTR_TYPE_EVTCHN 0x3 #define KVM_XEN_ATTR_TYPE_XEN_VERSION 0x4 +/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG */ +#define KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG 0x5 /* Per-vCPU Xen attributes */ #define KVM_XEN_VCPU_GET_ATTR _IOWR(KVMIO, 0xca, struct kvm_xen_vcpu_attr) diff --git a/mm/Kconfig b/mm/Kconfig index 34d36958b8ac..3425708f274c 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1031,6 +1031,14 @@ config ARCH_USES_HIGH_VMA_FLAGS config ARCH_HAS_PKEYS bool +config ARCH_USES_PG_ARCH_X + bool + help + Enable the definition of PG_arch_x page flags with x > 1. Only + suitable for 64-bit architectures with CONFIG_FLATMEM or + CONFIG_SPARSEMEM_VMEMMAP enabled, otherwise there may not be + enough room for additional bits in page->flags. + config VM_EVENT_COUNTERS default y bool "Enable VM event counters for /proc/vmstat" if EXPERT @@ -897,8 +897,17 @@ static int faultin_page(struct vm_area_struct *vma, fault_flags |= FAULT_FLAG_WRITE; if (*flags & FOLL_REMOTE) fault_flags |= FAULT_FLAG_REMOTE; - if (locked) + if (locked) { fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + /* + * FAULT_FLAG_INTERRUPTIBLE is opt-in. GUP callers must set + * FOLL_INTERRUPTIBLE to enable FAULT_FLAG_INTERRUPTIBLE. + * That's because some callers may not be prepared to + * handle early exits caused by non-fatal signals. + */ + if (*flags & FOLL_INTERRUPTIBLE) + fault_flags |= FAULT_FLAG_INTERRUPTIBLE; + } if (*flags & FOLL_NOWAIT) fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_RETRY_NOWAIT; if (*flags & FOLL_TRIED) { @@ -1306,6 +1315,22 @@ retry: EXPORT_SYMBOL_GPL(fixup_user_fault); /* + * GUP always responds to fatal signals. When FOLL_INTERRUPTIBLE is + * specified, it'll also respond to generic signals. The caller of GUP + * that has FOLL_INTERRUPTIBLE should take care of the GUP interruption. + */ +static bool gup_signal_pending(unsigned int flags) +{ + if (fatal_signal_pending(current)) + return true; + + if (!(flags & FOLL_INTERRUPTIBLE)) + return false; + + return signal_pending(current); +} + +/* * Please note that this function, unlike __get_user_pages will not * return 0 for nr_pages > 0 without FOLL_NOWAIT */ @@ -1386,11 +1411,11 @@ retry: * Repeat on the address that fired VM_FAULT_RETRY * with both FAULT_FLAG_ALLOW_RETRY and * FAULT_FLAG_TRIED. Note that GUP can be interrupted - * by fatal signals, so we need to check it before we + * by fatal signals of even common signals, depending on + * the caller's request. So we need to check it before we * start trying again otherwise it can loop forever. */ - - if (fatal_signal_pending(current)) { + if (gup_signal_pending(flags)) { if (!pages_done) pages_done = -EINTR; break; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2546199ab3c0..abe6cfd92ffa 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2461,8 +2461,9 @@ static void __split_huge_page_tail(struct page *head, int tail, (1L << PG_workingset) | (1L << PG_locked) | (1L << PG_unevictable) | -#ifdef CONFIG_64BIT +#ifdef CONFIG_ARCH_USES_PG_ARCH_X (1L << PG_arch_2) | + (1L << PG_arch_3) | #endif (1L << PG_dirty) | LRU_GEN_MASK | LRU_REFS_MASK)); diff --git a/mm/hugetlb.c b/mm/hugetlb.c index f5f445c39dbc..77f36e3681e3 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6347,9 +6347,12 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, fault_flags |= FAULT_FLAG_WRITE; else if (unshare) fault_flags |= FAULT_FLAG_UNSHARE; - if (locked) + if (locked) { fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + if (flags & FOLL_INTERRUPTIBLE) + fault_flags |= FAULT_FLAG_INTERRUPTIBLE; + } if (flags & FOLL_NOWAIT) fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_RETRY_NOWAIT; diff --git a/tools/arch/x86/include/asm/atomic.h b/tools/arch/x86/include/asm/atomic.h index 1f5e26aae9fc..365cf182df12 100644 --- a/tools/arch/x86/include/asm/atomic.h +++ b/tools/arch/x86/include/asm/atomic.h @@ -8,6 +8,7 @@ #define LOCK_PREFIX "\n\tlock; " +#include <asm/asm.h> #include <asm/cmpxchg.h> /* @@ -70,4 +71,14 @@ static __always_inline int atomic_cmpxchg(atomic_t *v, int old, int new) return cmpxchg(&v->counter, old, new); } +static inline int test_and_set_bit(long nr, unsigned long *addr) +{ + GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(bts), *addr, "Ir", nr, "%0", "c"); +} + +static inline int test_and_clear_bit(long nr, unsigned long *addr) +{ + GEN_BINARY_RMWcc(LOCK_PREFIX __ASM_SIZE(btc), *addr, "Ir", nr, "%0", "c"); +} + #endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */ diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h index 46de10a809ec..649e50a8f9dd 100644 --- a/tools/arch/x86/include/uapi/asm/kvm.h +++ b/tools/arch/x86/include/uapi/asm/kvm.h @@ -53,14 +53,6 @@ /* Architectural interrupt line count. */ #define KVM_NR_INTERRUPTS 256 -struct kvm_memory_alias { - __u32 slot; /* this has a different namespace than memory slots */ - __u32 flags; - __u64 guest_phys_addr; - __u64 memory_size; - __u64 target_phys_addr; -}; - /* for KVM_GET_IRQCHIP and KVM_SET_IRQCHIP */ struct kvm_pic_state { __u8 last_irr; /* edge detection */ diff --git a/tools/include/asm-generic/atomic-gcc.h b/tools/include/asm-generic/atomic-gcc.h index 4c1966f7c77a..9b3c528bab92 100644 --- a/tools/include/asm-generic/atomic-gcc.h +++ b/tools/include/asm-generic/atomic-gcc.h @@ -4,6 +4,7 @@ #include <linux/compiler.h> #include <linux/types.h> +#include <linux/bitops.h> /* * Atomic operations that C can't guarantee us. Useful for @@ -69,4 +70,26 @@ static inline int atomic_cmpxchg(atomic_t *v, int oldval, int newval) return cmpxchg(&(v)->counter, oldval, newval); } +static inline int test_and_set_bit(long nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + long old; + + addr += BIT_WORD(nr); + + old = __sync_fetch_and_or(addr, mask); + return !!(old & mask); +} + +static inline int test_and_clear_bit(long nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + long old; + + addr += BIT_WORD(nr); + + old = __sync_fetch_and_and(addr, ~mask); + return !!(old & mask); +} + #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */ diff --git a/tools/include/asm-generic/bitops/atomic.h b/tools/include/asm-generic/bitops/atomic.h index 2f6ea28764a7..ab37a221b41a 100644 --- a/tools/include/asm-generic/bitops/atomic.h +++ b/tools/include/asm-generic/bitops/atomic.h @@ -5,14 +5,11 @@ #include <asm/types.h> #include <asm/bitsperlong.h> -static inline void set_bit(int nr, unsigned long *addr) -{ - addr[nr / __BITS_PER_LONG] |= 1UL << (nr % __BITS_PER_LONG); -} - -static inline void clear_bit(int nr, unsigned long *addr) -{ - addr[nr / __BITS_PER_LONG] &= ~(1UL << (nr % __BITS_PER_LONG)); -} +/* + * Just alias the test versions, all of the compiler built-in atomics "fetch", + * and optimizing compile-time constants on x86 isn't worth the complexity. + */ +#define set_bit test_and_set_bit +#define clear_bit test_and_clear_bit #endif /* _TOOLS_LINUX_ASM_GENERIC_BITOPS_ATOMIC_H_ */ diff --git a/tools/include/linux/bitfield.h b/tools/include/linux/bitfield.h new file mode 100644 index 000000000000..6093fa6db260 --- /dev/null +++ b/tools/include/linux/bitfield.h @@ -0,0 +1,176 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2014 Felix Fietkau <nbd@nbd.name> + * Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com> + */ + +#ifndef _LINUX_BITFIELD_H +#define _LINUX_BITFIELD_H + +#include <linux/build_bug.h> +#include <asm/byteorder.h> + +/* + * Bitfield access macros + * + * FIELD_{GET,PREP} macros take as first parameter shifted mask + * from which they extract the base mask and shift amount. + * Mask must be a compilation time constant. + * + * Example: + * + * #define REG_FIELD_A GENMASK(6, 0) + * #define REG_FIELD_B BIT(7) + * #define REG_FIELD_C GENMASK(15, 8) + * #define REG_FIELD_D GENMASK(31, 16) + * + * Get: + * a = FIELD_GET(REG_FIELD_A, reg); + * b = FIELD_GET(REG_FIELD_B, reg); + * + * Set: + * reg = FIELD_PREP(REG_FIELD_A, 1) | + * FIELD_PREP(REG_FIELD_B, 0) | + * FIELD_PREP(REG_FIELD_C, c) | + * FIELD_PREP(REG_FIELD_D, 0x40); + * + * Modify: + * reg &= ~REG_FIELD_C; + * reg |= FIELD_PREP(REG_FIELD_C, c); + */ + +#define __bf_shf(x) (__builtin_ffsll(x) - 1) + +#define __scalar_type_to_unsigned_cases(type) \ + unsigned type: (unsigned type)0, \ + signed type: (unsigned type)0 + +#define __unsigned_scalar_typeof(x) typeof( \ + _Generic((x), \ + char: (unsigned char)0, \ + __scalar_type_to_unsigned_cases(char), \ + __scalar_type_to_unsigned_cases(short), \ + __scalar_type_to_unsigned_cases(int), \ + __scalar_type_to_unsigned_cases(long), \ + __scalar_type_to_unsigned_cases(long long), \ + default: (x))) + +#define __bf_cast_unsigned(type, x) ((__unsigned_scalar_typeof(type))(x)) + +#define __BF_FIELD_CHECK(_mask, _reg, _val, _pfx) \ + ({ \ + BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask), \ + _pfx "mask is not constant"); \ + BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero"); \ + BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \ + ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \ + _pfx "value too large for the field"); \ + BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) > \ + __bf_cast_unsigned(_reg, ~0ull), \ + _pfx "type of reg too small for mask"); \ + __BUILD_BUG_ON_NOT_POWER_OF_2((_mask) + \ + (1ULL << __bf_shf(_mask))); \ + }) + +/** + * FIELD_MAX() - produce the maximum value representable by a field + * @_mask: shifted mask defining the field's length and position + * + * FIELD_MAX() returns the maximum value that can be held in the field + * specified by @_mask. + */ +#define FIELD_MAX(_mask) \ + ({ \ + __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_MAX: "); \ + (typeof(_mask))((_mask) >> __bf_shf(_mask)); \ + }) + +/** + * FIELD_FIT() - check if value fits in the field + * @_mask: shifted mask defining the field's length and position + * @_val: value to test against the field + * + * Return: true if @_val can fit inside @_mask, false if @_val is too big. + */ +#define FIELD_FIT(_mask, _val) \ + ({ \ + __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_FIT: "); \ + !((((typeof(_mask))_val) << __bf_shf(_mask)) & ~(_mask)); \ + }) + +/** + * FIELD_PREP() - prepare a bitfield element + * @_mask: shifted mask defining the field's length and position + * @_val: value to put in the field + * + * FIELD_PREP() masks and shifts up the value. The result should + * be combined with other fields of the bitfield using logical OR. + */ +#define FIELD_PREP(_mask, _val) \ + ({ \ + __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \ + ((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask); \ + }) + +/** + * FIELD_GET() - extract a bitfield element + * @_mask: shifted mask defining the field's length and position + * @_reg: value of entire bitfield + * + * FIELD_GET() extracts the field specified by @_mask from the + * bitfield passed in as @_reg by masking and shifting it down. + */ +#define FIELD_GET(_mask, _reg) \ + ({ \ + __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \ + (typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask)); \ + }) + +extern void __compiletime_error("value doesn't fit into mask") +__field_overflow(void); +extern void __compiletime_error("bad bitfield mask") +__bad_mask(void); +static __always_inline u64 field_multiplier(u64 field) +{ + if ((field | (field - 1)) & ((field | (field - 1)) + 1)) + __bad_mask(); + return field & -field; +} +static __always_inline u64 field_mask(u64 field) +{ + return field / field_multiplier(field); +} +#define field_max(field) ((typeof(field))field_mask(field)) +#define ____MAKE_OP(type,base,to,from) \ +static __always_inline __##type type##_encode_bits(base v, base field) \ +{ \ + if (__builtin_constant_p(v) && (v & ~field_mask(field))) \ + __field_overflow(); \ + return to((v & field_mask(field)) * field_multiplier(field)); \ +} \ +static __always_inline __##type type##_replace_bits(__##type old, \ + base val, base field) \ +{ \ + return (old & ~to(field)) | type##_encode_bits(val, field); \ +} \ +static __always_inline void type##p_replace_bits(__##type *p, \ + base val, base field) \ +{ \ + *p = (*p & ~to(field)) | type##_encode_bits(val, field); \ +} \ +static __always_inline base type##_get_bits(__##type v, base field) \ +{ \ + return (from(v) & field)/field_multiplier(field); \ +} +#define __MAKE_OP(size) \ + ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \ + ____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu) \ + ____MAKE_OP(u##size,u##size,,) +____MAKE_OP(u8,u8,,) +__MAKE_OP(16) +__MAKE_OP(32) +__MAKE_OP(64) +#undef __MAKE_OP +#undef ____MAKE_OP + +#endif diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h index 65d0747c5205..f3566ea0f932 100644 --- a/tools/include/linux/bitmap.h +++ b/tools/include/linux/bitmap.h @@ -78,40 +78,6 @@ static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, } /** - * test_and_set_bit - Set a bit and return its old value - * @nr: Bit to set - * @addr: Address to count from - */ -static inline int test_and_set_bit(int nr, unsigned long *addr) -{ - unsigned long mask = BIT_MASK(nr); - unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); - unsigned long old; - - old = *p; - *p = old | mask; - - return (old & mask) != 0; -} - -/** - * test_and_clear_bit - Clear a bit and return its old value - * @nr: Bit to clear - * @addr: Address to count from - */ -static inline int test_and_clear_bit(int nr, unsigned long *addr) -{ - unsigned long mask = BIT_MASK(nr); - unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); - unsigned long old; - - old = *p; - *p = old & ~mask; - - return (old & mask) != 0; -} - -/** * bitmap_zalloc - Allocate bitmap * @nbits: Number of bits */ diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h index 0d5d4419139a..21d6d29502e4 100644 --- a/tools/include/uapi/linux/kvm.h +++ b/tools/include/uapi/linux/kvm.h @@ -86,14 +86,6 @@ struct kvm_debug_guest { /* *** End of deprecated interfaces *** */ -/* for KVM_CREATE_MEMORY_REGION */ -struct kvm_memory_region { - __u32 slot; - __u32 flags; - __u64 guest_phys_addr; - __u64 memory_size; /* bytes */ -}; - /* for KVM_SET_USER_MEMORY_REGION */ struct kvm_userspace_memory_region { __u32 slot; @@ -104,9 +96,9 @@ struct kvm_userspace_memory_region { }; /* - * The bit 0 ~ bit 15 of kvm_memory_region::flags are visible for userspace, - * other bits are reserved for kvm internal use which are defined in - * include/linux/kvm_host.h. + * The bit 0 ~ bit 15 of kvm_userspace_memory_region::flags are visible for + * userspace, other bits are reserved for kvm internal use which are defined + *in include/linux/kvm_host.h. */ #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) #define KVM_MEM_READONLY (1UL << 1) @@ -1438,17 +1430,11 @@ struct kvm_vfio_spapr_tce { }; /* - * ioctls for VM fds - */ -#define KVM_SET_MEMORY_REGION _IOW(KVMIO, 0x40, struct kvm_memory_region) -/* * KVM_CREATE_VCPU receives as a parameter the vcpu slot, and returns * a vcpu fd. */ #define KVM_CREATE_VCPU _IO(KVMIO, 0x41) #define KVM_GET_DIRTY_LOG _IOW(KVMIO, 0x42, struct kvm_dirty_log) -/* KVM_SET_MEMORY_ALIAS is obsolete: */ -#define KVM_SET_MEMORY_ALIAS _IOW(KVMIO, 0x43, struct kvm_memory_alias) #define KVM_SET_NR_MMU_PAGES _IO(KVMIO, 0x44) #define KVM_GET_NR_MMU_PAGES _IO(KVMIO, 0x45) #define KVM_SET_USER_MEMORY_REGION _IOW(KVMIO, 0x46, \ diff --git a/tools/perf/bench/find-bit-bench.c b/tools/perf/bench/find-bit-bench.c index 22b5cfe97023..d103c3136983 100644 --- a/tools/perf/bench/find-bit-bench.c +++ b/tools/perf/bench/find-bit-bench.c @@ -70,7 +70,7 @@ static int do_for_each_set_bit(unsigned int num_bits) bitmap_zero(to_test, num_bits); skip = num_bits / set_bits; for (i = 0; i < num_bits; i += skip) - set_bit(i, to_test); + __set_bit(i, to_test); for (i = 0; i < outer_iterations; i++) { old = accumulator; diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c index a9190458d2d5..52d94c7dd836 100644 --- a/tools/perf/builtin-c2c.c +++ b/tools/perf/builtin-c2c.c @@ -230,7 +230,7 @@ static void c2c_he__set_cpu(struct c2c_hist_entry *c2c_he, "WARNING: no sample cpu value")) return; - set_bit(sample->cpu, c2c_he->cpuset); + __set_bit(sample->cpu, c2c_he->cpuset); } static void c2c_he__set_node(struct c2c_hist_entry *c2c_he, @@ -247,7 +247,7 @@ static void c2c_he__set_node(struct c2c_hist_entry *c2c_he, if (WARN_ONCE(node < 0, "WARNING: failed to find node\n")) return; - set_bit(node, c2c_he->nodeset); + __set_bit(node, c2c_he->nodeset); if (c2c_he->paddr != sample->phys_addr) { c2c_he->paddr_cnt++; @@ -2318,7 +2318,7 @@ static int setup_nodes(struct perf_session *session) continue; perf_cpu_map__for_each_cpu(cpu, idx, map) { - set_bit(cpu.cpu, set); + __set_bit(cpu.cpu, set); if (WARN_ONCE(cpu2node[cpu.cpu] != -1, "node/cpu topology bug")) return -EINVAL; diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c index fb8c63656ad8..1f63e24f704e 100644 --- a/tools/perf/builtin-kwork.c +++ b/tools/perf/builtin-kwork.c @@ -216,7 +216,7 @@ static struct kwork_atom *atom_new(struct perf_kwork *kwork, list_add_tail(&page->list, &kwork->atom_page_list); found_atom: - set_bit(i, page->bitmap); + __set_bit(i, page->bitmap); atom->time = sample->time; atom->prev = NULL; atom->page_addr = page; @@ -229,8 +229,8 @@ static void atom_free(struct kwork_atom *atom) if (atom->prev != NULL) atom_free(atom->prev); - clear_bit(atom->bit_inpage, - ((struct kwork_atom_page *)atom->page_addr)->bitmap); + __clear_bit(atom->bit_inpage, + ((struct kwork_atom_page *)atom->page_addr)->bitmap); } static void atom_del(struct kwork_atom *atom) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index e128b855ddde..2711c141c5bf 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -3555,7 +3555,7 @@ static int record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cp /* Return ENODEV is input cpu is greater than max cpu */ if ((unsigned long)cpu.cpu > mask->nbits) return -ENODEV; - set_bit(cpu.cpu, mask->bits); + __set_bit(cpu.cpu, mask->bits); } return 0; @@ -3627,8 +3627,8 @@ static int record__init_thread_cpu_masks(struct record *rec, struct perf_cpu_map pr_debug("nr_threads: %d\n", rec->nr_threads); for (t = 0; t < rec->nr_threads; t++) { - set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].maps.bits); - set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].affinity.bits); + __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].maps.bits); + __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].affinity.bits); if (verbose) { pr_debug("thread_masks[%d]: ", t); mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps"); diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index f93737eef07b..86e18575c9be 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -1573,7 +1573,7 @@ static int map_switch_event(struct perf_sched *sched, struct evsel *evsel, if (sched->map.comp) { cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS); - if (!test_and_set_bit(this_cpu.cpu, sched->map.comp_cpus_mask)) { + if (!__test_and_set_bit(this_cpu.cpu, sched->map.comp_cpus_mask)) { sched->map.comp_cpus[cpus_nr++] = this_cpu; new_cpu = true; } diff --git a/tools/perf/tests/bitmap.c b/tools/perf/tests/bitmap.c index 4965dd666956..0173f5402a35 100644 --- a/tools/perf/tests/bitmap.c +++ b/tools/perf/tests/bitmap.c @@ -18,7 +18,7 @@ static unsigned long *get_bitmap(const char *str, int nbits) if (map && bm) { for (i = 0; i < perf_cpu_map__nr(map); i++) - set_bit(perf_cpu_map__cpu(map, i).cpu, bm); + __set_bit(perf_cpu_map__cpu(map, i).cpu, bm); } if (map) diff --git a/tools/perf/tests/mem2node.c b/tools/perf/tests/mem2node.c index 4c96829510c9..a0e88c496107 100644 --- a/tools/perf/tests/mem2node.c +++ b/tools/perf/tests/mem2node.c @@ -33,7 +33,7 @@ static unsigned long *get_bitmap(const char *str, int nbits) int i; perf_cpu_map__for_each_cpu(cpu, i, map) - set_bit(cpu.cpu, bm); + __set_bit(cpu.cpu, bm); } if (map) diff --git a/tools/perf/util/affinity.c b/tools/perf/util/affinity.c index 4ee96b3c755b..38dc4524b7e8 100644 --- a/tools/perf/util/affinity.c +++ b/tools/perf/util/affinity.c @@ -58,14 +58,14 @@ void affinity__set(struct affinity *a, int cpu) return; a->changed = true; - set_bit(cpu, a->sched_cpus); + __set_bit(cpu, a->sched_cpus); /* * We ignore errors because affinity is just an optimization. * This could happen for example with isolated CPUs or cpusets. * In this case the IPIs inside the kernel's perf API still work. */ sched_setaffinity(0, cpu_set_size, (cpu_set_t *)a->sched_cpus); - clear_bit(cpu, a->sched_cpus); + __clear_bit(cpu, a->sched_cpus); } static void __affinity__cleanup(struct affinity *a) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 98dfaf84bd13..dc2ae397d400 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -79,12 +79,12 @@ struct perf_file_attr { void perf_header__set_feat(struct perf_header *header, int feat) { - set_bit(feat, header->adds_features); + __set_bit(feat, header->adds_features); } void perf_header__clear_feat(struct perf_header *header, int feat) { - clear_bit(feat, header->adds_features); + __clear_bit(feat, header->adds_features); } bool perf_header__has_feat(const struct perf_header *header, int feat) @@ -1358,7 +1358,7 @@ static int memory_node__read(struct memory_node *n, unsigned long idx) rewinddir(dir); for_each_memory(phys, dir) { - set_bit(phys, n->set); + __set_bit(phys, n->set); } closedir(dir); @@ -3952,7 +3952,7 @@ int perf_file_header__read(struct perf_file_header *header, if (!test_bit(HEADER_HOSTNAME, header->adds_features)) { bitmap_zero(header->adds_features, HEADER_FEAT_BITS); - set_bit(HEADER_BUILD_ID, header->adds_features); + __set_bit(HEADER_BUILD_ID, header->adds_features); } } diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c index a4dff881be39..49093b21ee2d 100644 --- a/tools/perf/util/mmap.c +++ b/tools/perf/util/mmap.c @@ -111,7 +111,7 @@ static int perf_mmap__aio_bind(struct mmap *map, int idx, struct perf_cpu cpu, i pr_err("Failed to allocate node mask for mbind: error %m\n"); return -1; } - set_bit(node_index, node_mask); + __set_bit(node_index, node_mask); if (mbind(data, mmap_len, MPOL_BIND, node_mask, node_index + 1 + 1, 0)) { pr_err("Failed to bind [%p-%p] AIO buffer to node %lu: error %m\n", data, data + mmap_len, node_index); @@ -256,7 +256,7 @@ static void build_node_mask(int node, struct mmap_cpu_mask *mask) for (idx = 0; idx < nr_cpus; idx++) { cpu = perf_cpu_map__cpu(cpu_map, idx); /* map c index to online cpu index */ if (cpu__get_node(cpu) == node) - set_bit(cpu.cpu, mask->bits); + __set_bit(cpu.cpu, mask->bits); } } @@ -270,7 +270,7 @@ static int perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params * if (mp->affinity == PERF_AFFINITY_NODE && cpu__max_node() > 1) build_node_mask(cpu__get_node(map->core.cpu), &map->affinity_mask); else if (mp->affinity == PERF_AFFINITY_CPU) - set_bit(map->core.cpu.cpu, map->affinity_mask.bits); + __set_bit(map->core.cpu.cpu, map->affinity_mask.bits); return 0; } diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 03284059175f..371d8f7a3de3 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -1513,7 +1513,7 @@ void perf_pmu__set_format(unsigned long *bits, long from, long to) memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS)); for (b = from; b <= to; b++) - set_bit(b, bits); + __set_bit(b, bits); } void perf_pmu__del_formats(struct list_head *formats) diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c index a5d945415bbc..5b602b6d4685 100644 --- a/tools/perf/util/scripting-engines/trace-event-perl.c +++ b/tools/perf/util/scripting-engines/trace-event-perl.c @@ -365,7 +365,7 @@ static void perl_process_tracepoint(struct perf_sample *sample, sprintf(handler, "%s::%s", event->system, event->name); - if (!test_and_set_bit(event->id, events_defined)) + if (!__test_and_set_bit(event->id, events_defined)) define_event_symbols(event, handler, event->print_fmt.args); s = nsecs / NSEC_PER_SEC; diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c index 1f2040f36d4e..0f229fa29163 100644 --- a/tools/perf/util/scripting-engines/trace-event-python.c +++ b/tools/perf/util/scripting-engines/trace-event-python.c @@ -933,7 +933,7 @@ static void python_process_tracepoint(struct perf_sample *sample, sprintf(handler_name, "%s__%s", event->system, event->name); - if (!test_and_set_bit(event->id, events_defined)) + if (!__test_and_set_bit(event->id, events_defined)) define_event_symbols(event, handler_name, event->print_fmt.args); handler = get_handler(handler_name); diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 1a4f10de29ff..873fd51ec1b2 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -2748,7 +2748,7 @@ int perf_session__cpu_bitmap(struct perf_session *session, goto out_delete_map; } - set_bit(cpu.cpu, cpu_bitmap); + __set_bit(cpu.cpu, cpu_bitmap); } err = 0; diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c index 1e0c731fc539..5c62d3118c41 100644 --- a/tools/perf/util/svghelper.c +++ b/tools/perf/util/svghelper.c @@ -741,7 +741,7 @@ static int str_to_bitmap(char *s, cpumask_t *b, int nr_cpus) break; } - set_bit(c.cpu, cpumask_bits(b)); + __set_bit(c.cpu, cpumask_bits(b)); } perf_cpu_map__put(m); diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 05d980fb083d..6ce8c488d62e 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -4,6 +4,7 @@ /aarch64/debug-exceptions /aarch64/get-reg-list /aarch64/hypercalls +/aarch64/page_fault_test /aarch64/psci_test /aarch64/vcpu_width_config /aarch64/vgic_init @@ -16,16 +17,18 @@ /x86_64/cpuid_test /x86_64/cr4_cpuid_sync_test /x86_64/debug_regs -/x86_64/evmcs_test -/x86_64/emulator_error_test +/x86_64/exit_on_emulation_failure_test /x86_64/fix_hypercall_test /x86_64/get_msr_index_features /x86_64/kvm_clock_test /x86_64/kvm_pv_test /x86_64/hyperv_clock /x86_64/hyperv_cpuid +/x86_64/hyperv_evmcs /x86_64/hyperv_features +/x86_64/hyperv_ipi /x86_64/hyperv_svm_test +/x86_64/hyperv_tlb_flush /x86_64/max_vcpuid_cap_test /x86_64/mmio_warning_test /x86_64/monitor_mwait_test @@ -36,6 +39,7 @@ /x86_64/set_boot_cpu_id /x86_64/set_sregs_test /x86_64/sev_migrate_tests +/x86_64/smaller_maxphyaddr_emulation_test /x86_64/smm_test /x86_64/state_test /x86_64/svm_vmcall_test diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 4a2caef2c939..947676983da1 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -43,16 +43,19 @@ LIBKVM += lib/elf.c LIBKVM += lib/guest_modes.c LIBKVM += lib/io.c LIBKVM += lib/kvm_util.c -LIBKVM += lib/perf_test_util.c +LIBKVM += lib/memstress.c LIBKVM += lib/rbtree.c LIBKVM += lib/sparsebit.c LIBKVM += lib/test_util.c +LIBKVM += lib/ucall_common.c +LIBKVM += lib/userfaultfd_util.c LIBKVM_STRING += lib/string_override.c LIBKVM_x86_64 += lib/x86_64/apic.c LIBKVM_x86_64 += lib/x86_64/handlers.S -LIBKVM_x86_64 += lib/x86_64/perf_test_util.c +LIBKVM_x86_64 += lib/x86_64/hyperv.c +LIBKVM_x86_64 += lib/x86_64/memstress.c LIBKVM_x86_64 += lib/x86_64/processor.c LIBKVM_x86_64 += lib/x86_64/svm.c LIBKVM_x86_64 += lib/x86_64/ucall.c @@ -80,13 +83,15 @@ TEST_PROGS_x86_64 += x86_64/nx_huge_pages_test.sh TEST_GEN_PROGS_x86_64 = x86_64/cpuid_test TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test TEST_GEN_PROGS_x86_64 += x86_64/get_msr_index_features -TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test -TEST_GEN_PROGS_x86_64 += x86_64/emulator_error_test +TEST_GEN_PROGS_x86_64 += x86_64/exit_on_emulation_failure_test TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_evmcs TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_ipi TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test +TEST_GEN_PROGS_x86_64 += x86_64/hyperv_tlb_flush TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test TEST_GEN_PROGS_x86_64 += x86_64/mmio_warning_test @@ -96,6 +101,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/platform_info_test TEST_GEN_PROGS_x86_64 += x86_64/pmu_event_filter_test TEST_GEN_PROGS_x86_64 += x86_64/set_boot_cpu_id TEST_GEN_PROGS_x86_64 += x86_64/set_sregs_test +TEST_GEN_PROGS_x86_64 += x86_64/smaller_maxphyaddr_emulation_test TEST_GEN_PROGS_x86_64 += x86_64/smm_test TEST_GEN_PROGS_x86_64 += x86_64/state_test TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test @@ -153,10 +159,12 @@ TEST_GEN_PROGS_aarch64 += aarch64/arch_timer TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list TEST_GEN_PROGS_aarch64 += aarch64/hypercalls +TEST_GEN_PROGS_aarch64 += aarch64/page_fault_test TEST_GEN_PROGS_aarch64 += aarch64/psci_test TEST_GEN_PROGS_aarch64 += aarch64/vcpu_width_config TEST_GEN_PROGS_aarch64 += aarch64/vgic_init TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq +TEST_GEN_PROGS_aarch64 += access_tracking_perf_test TEST_GEN_PROGS_aarch64 += demand_paging_test TEST_GEN_PROGS_aarch64 += dirty_log_test TEST_GEN_PROGS_aarch64 += dirty_log_perf_test diff --git a/tools/testing/selftests/kvm/aarch64/aarch32_id_regs.c b/tools/testing/selftests/kvm/aarch64/aarch32_id_regs.c index 6f9c1f19c7f6..4951ac53d1f8 100644 --- a/tools/testing/selftests/kvm/aarch64/aarch32_id_regs.c +++ b/tools/testing/selftests/kvm/aarch64/aarch32_id_regs.c @@ -13,6 +13,7 @@ #include "kvm_util.h" #include "processor.h" #include "test_util.h" +#include <linux/bitfield.h> #define BAD_ID_REG_VAL 0x1badc0deul @@ -145,7 +146,7 @@ static bool vcpu_aarch64_only(struct kvm_vcpu *vcpu) vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64PFR0_EL1), &val); - el0 = (val & ARM64_FEATURE_MASK(ID_AA64PFR0_EL0)) >> ID_AA64PFR0_EL0_SHIFT; + el0 = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL0), val); return el0 == ID_AA64PFR0_ELx_64BIT_ONLY; } @@ -158,12 +159,9 @@ int main(void) TEST_REQUIRE(vcpu_aarch64_only(vcpu)); - ucall_init(vm, NULL); - test_user_raz_wi(vcpu); test_user_raz_invariant(vcpu); test_guest_raz(vcpu); - ucall_uninit(vm); kvm_vm_free(vm); } diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c index 574eb73f0e90..26556a266021 100644 --- a/tools/testing/selftests/kvm/aarch64/arch_timer.c +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c @@ -222,7 +222,7 @@ static void *test_vcpu_run(void *arg) /* Currently, any exit from guest is an indication of completion */ pthread_mutex_lock(&vcpu_done_map_lock); - set_bit(vcpu_idx, vcpu_done_map); + __set_bit(vcpu_idx, vcpu_done_map); pthread_mutex_unlock(&vcpu_done_map_lock); switch (get_ucall(vcpu, &uc)) { @@ -375,7 +375,6 @@ static struct kvm_vm *test_vm_create(void) for (i = 0; i < nr_vcpus; i++) vcpu_init_descriptor_tables(vcpus[i]); - ucall_init(vm, NULL); test_init_timer_irq(vm); gic_fd = vgic_v3_setup(vm, nr_vcpus, 64, GICD_BASE_GPA, GICR_BASE_GPA); __TEST_REQUIRE(gic_fd >= 0, "Failed to create vgic-v3"); @@ -414,36 +413,21 @@ static bool parse_args(int argc, char *argv[]) while ((opt = getopt(argc, argv, "hn:i:p:m:")) != -1) { switch (opt) { case 'n': - test_args.nr_vcpus = atoi(optarg); - if (test_args.nr_vcpus <= 0) { - pr_info("Positive value needed for -n\n"); - goto err; - } else if (test_args.nr_vcpus > KVM_MAX_VCPUS) { + test_args.nr_vcpus = atoi_positive("Number of vCPUs", optarg); + if (test_args.nr_vcpus > KVM_MAX_VCPUS) { pr_info("Max allowed vCPUs: %u\n", KVM_MAX_VCPUS); goto err; } break; case 'i': - test_args.nr_iter = atoi(optarg); - if (test_args.nr_iter <= 0) { - pr_info("Positive value needed for -i\n"); - goto err; - } + test_args.nr_iter = atoi_positive("Number of iterations", optarg); break; case 'p': - test_args.timer_period_ms = atoi(optarg); - if (test_args.timer_period_ms <= 0) { - pr_info("Positive value needed for -p\n"); - goto err; - } + test_args.timer_period_ms = atoi_positive("Periodicity", optarg); break; case 'm': - test_args.migration_freq_ms = atoi(optarg); - if (test_args.migration_freq_ms < 0) { - pr_info("0 or positive value needed for -m\n"); - goto err; - } + test_args.migration_freq_ms = atoi_non_negative("Frequency", optarg); break; case 'h': default: @@ -462,9 +446,6 @@ int main(int argc, char *argv[]) { struct kvm_vm *vm; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - if (!parse_args(argc, argv)) exit(KSFT_SKIP); diff --git a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c index 947bd201435c..637be796086f 100644 --- a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c +++ b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c @@ -2,6 +2,7 @@ #include <test_util.h> #include <kvm_util.h> #include <processor.h> +#include <linux/bitfield.h> #define MDSCR_KDE (1 << 13) #define MDSCR_MDE (1 << 15) @@ -11,17 +12,24 @@ #define DBGBCR_EXEC (0x0 << 3) #define DBGBCR_EL1 (0x1 << 1) #define DBGBCR_E (0x1 << 0) +#define DBGBCR_LBN_SHIFT 16 +#define DBGBCR_BT_SHIFT 20 +#define DBGBCR_BT_ADDR_LINK_CTX (0x1 << DBGBCR_BT_SHIFT) +#define DBGBCR_BT_CTX_LINK (0x3 << DBGBCR_BT_SHIFT) #define DBGWCR_LEN8 (0xff << 5) #define DBGWCR_RD (0x1 << 3) #define DBGWCR_WR (0x2 << 3) #define DBGWCR_EL1 (0x1 << 1) #define DBGWCR_E (0x1 << 0) +#define DBGWCR_LBN_SHIFT 16 +#define DBGWCR_WT_SHIFT 20 +#define DBGWCR_WT_LINK (0x1 << DBGWCR_WT_SHIFT) #define SPSR_D (1 << 9) #define SPSR_SS (1 << 21) -extern unsigned char sw_bp, sw_bp2, hw_bp, hw_bp2, bp_svc, bp_brk, hw_wp, ss_start; +extern unsigned char sw_bp, sw_bp2, hw_bp, hw_bp2, bp_svc, bp_brk, hw_wp, ss_start, hw_bp_ctx; extern unsigned char iter_ss_begin, iter_ss_end; static volatile uint64_t sw_bp_addr, hw_bp_addr; static volatile uint64_t wp_addr, wp_data_addr; @@ -29,8 +37,74 @@ static volatile uint64_t svc_addr; static volatile uint64_t ss_addr[4], ss_idx; #define PC(v) ((uint64_t)&(v)) +#define GEN_DEBUG_WRITE_REG(reg_name) \ +static void write_##reg_name(int num, uint64_t val) \ +{ \ + switch (num) { \ + case 0: \ + write_sysreg(val, reg_name##0_el1); \ + break; \ + case 1: \ + write_sysreg(val, reg_name##1_el1); \ + break; \ + case 2: \ + write_sysreg(val, reg_name##2_el1); \ + break; \ + case 3: \ + write_sysreg(val, reg_name##3_el1); \ + break; \ + case 4: \ + write_sysreg(val, reg_name##4_el1); \ + break; \ + case 5: \ + write_sysreg(val, reg_name##5_el1); \ + break; \ + case 6: \ + write_sysreg(val, reg_name##6_el1); \ + break; \ + case 7: \ + write_sysreg(val, reg_name##7_el1); \ + break; \ + case 8: \ + write_sysreg(val, reg_name##8_el1); \ + break; \ + case 9: \ + write_sysreg(val, reg_name##9_el1); \ + break; \ + case 10: \ + write_sysreg(val, reg_name##10_el1); \ + break; \ + case 11: \ + write_sysreg(val, reg_name##11_el1); \ + break; \ + case 12: \ + write_sysreg(val, reg_name##12_el1); \ + break; \ + case 13: \ + write_sysreg(val, reg_name##13_el1); \ + break; \ + case 14: \ + write_sysreg(val, reg_name##14_el1); \ + break; \ + case 15: \ + write_sysreg(val, reg_name##15_el1); \ + break; \ + default: \ + GUEST_ASSERT(0); \ + } \ +} + +/* Define write_dbgbcr()/write_dbgbvr()/write_dbgwcr()/write_dbgwvr() */ +GEN_DEBUG_WRITE_REG(dbgbcr) +GEN_DEBUG_WRITE_REG(dbgbvr) +GEN_DEBUG_WRITE_REG(dbgwcr) +GEN_DEBUG_WRITE_REG(dbgwvr) + static void reset_debug_state(void) { + uint8_t brps, wrps, i; + uint64_t dfr0; + asm volatile("msr daifset, #8"); write_sysreg(0, osdlr_el1); @@ -38,11 +112,21 @@ static void reset_debug_state(void) isb(); write_sysreg(0, mdscr_el1); - /* This test only uses the first bp and wp slot. */ - write_sysreg(0, dbgbvr0_el1); - write_sysreg(0, dbgbcr0_el1); - write_sysreg(0, dbgwcr0_el1); - write_sysreg(0, dbgwvr0_el1); + write_sysreg(0, contextidr_el1); + + /* Reset all bcr/bvr/wcr/wvr registers */ + dfr0 = read_sysreg(id_aa64dfr0_el1); + brps = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_BRPS), dfr0); + for (i = 0; i <= brps; i++) { + write_dbgbcr(i, 0); + write_dbgbvr(i, 0); + } + wrps = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_WRPS), dfr0); + for (i = 0; i <= wrps; i++) { + write_dbgwcr(i, 0); + write_dbgwvr(i, 0); + } + isb(); } @@ -54,16 +138,10 @@ static void enable_os_lock(void) GUEST_ASSERT(read_sysreg(oslsr_el1) & 2); } -static void install_wp(uint64_t addr) +static void enable_monitor_debug_exceptions(void) { - uint32_t wcr; uint32_t mdscr; - wcr = DBGWCR_LEN8 | DBGWCR_RD | DBGWCR_WR | DBGWCR_EL1 | DBGWCR_E; - write_sysreg(wcr, dbgwcr0_el1); - write_sysreg(addr, dbgwvr0_el1); - isb(); - asm volatile("msr daifclr, #8"); mdscr = read_sysreg(mdscr_el1) | MDSCR_KDE | MDSCR_MDE; @@ -71,21 +149,76 @@ static void install_wp(uint64_t addr) isb(); } -static void install_hw_bp(uint64_t addr) +static void install_wp(uint8_t wpn, uint64_t addr) +{ + uint32_t wcr; + + wcr = DBGWCR_LEN8 | DBGWCR_RD | DBGWCR_WR | DBGWCR_EL1 | DBGWCR_E; + write_dbgwcr(wpn, wcr); + write_dbgwvr(wpn, addr); + + isb(); + + enable_monitor_debug_exceptions(); +} + +static void install_hw_bp(uint8_t bpn, uint64_t addr) { uint32_t bcr; - uint32_t mdscr; bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E; - write_sysreg(bcr, dbgbcr0_el1); - write_sysreg(addr, dbgbvr0_el1); + write_dbgbcr(bpn, bcr); + write_dbgbvr(bpn, addr); isb(); - asm volatile("msr daifclr, #8"); + enable_monitor_debug_exceptions(); +} - mdscr = read_sysreg(mdscr_el1) | MDSCR_KDE | MDSCR_MDE; - write_sysreg(mdscr, mdscr_el1); +static void install_wp_ctx(uint8_t addr_wp, uint8_t ctx_bp, uint64_t addr, + uint64_t ctx) +{ + uint32_t wcr; + uint64_t ctx_bcr; + + /* Setup a context-aware breakpoint for Linked Context ID Match */ + ctx_bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E | + DBGBCR_BT_CTX_LINK; + write_dbgbcr(ctx_bp, ctx_bcr); + write_dbgbvr(ctx_bp, ctx); + + /* Setup a linked watchpoint (linked to the context-aware breakpoint) */ + wcr = DBGWCR_LEN8 | DBGWCR_RD | DBGWCR_WR | DBGWCR_EL1 | DBGWCR_E | + DBGWCR_WT_LINK | ((uint32_t)ctx_bp << DBGWCR_LBN_SHIFT); + write_dbgwcr(addr_wp, wcr); + write_dbgwvr(addr_wp, addr); + isb(); + + enable_monitor_debug_exceptions(); +} + +void install_hw_bp_ctx(uint8_t addr_bp, uint8_t ctx_bp, uint64_t addr, + uint64_t ctx) +{ + uint32_t addr_bcr, ctx_bcr; + + /* Setup a context-aware breakpoint for Linked Context ID Match */ + ctx_bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E | + DBGBCR_BT_CTX_LINK; + write_dbgbcr(ctx_bp, ctx_bcr); + write_dbgbvr(ctx_bp, ctx); + + /* + * Setup a normal breakpoint for Linked Address Match, and link it + * to the context-aware breakpoint. + */ + addr_bcr = DBGBCR_LEN8 | DBGBCR_EXEC | DBGBCR_EL1 | DBGBCR_E | + DBGBCR_BT_ADDR_LINK_CTX | + ((uint32_t)ctx_bp << DBGBCR_LBN_SHIFT); + write_dbgbcr(addr_bp, addr_bcr); + write_dbgbvr(addr_bp, addr); isb(); + + enable_monitor_debug_exceptions(); } static void install_ss(void) @@ -101,52 +234,42 @@ static void install_ss(void) static volatile char write_data; -static void guest_code(void) +static void guest_code(uint8_t bpn, uint8_t wpn, uint8_t ctx_bpn) { - GUEST_SYNC(0); + uint64_t ctx = 0xabcdef; /* a random context number */ /* Software-breakpoint */ reset_debug_state(); asm volatile("sw_bp: brk #0"); GUEST_ASSERT_EQ(sw_bp_addr, PC(sw_bp)); - GUEST_SYNC(1); - /* Hardware-breakpoint */ reset_debug_state(); - install_hw_bp(PC(hw_bp)); + install_hw_bp(bpn, PC(hw_bp)); asm volatile("hw_bp: nop"); GUEST_ASSERT_EQ(hw_bp_addr, PC(hw_bp)); - GUEST_SYNC(2); - /* Hardware-breakpoint + svc */ reset_debug_state(); - install_hw_bp(PC(bp_svc)); + install_hw_bp(bpn, PC(bp_svc)); asm volatile("bp_svc: svc #0"); GUEST_ASSERT_EQ(hw_bp_addr, PC(bp_svc)); GUEST_ASSERT_EQ(svc_addr, PC(bp_svc) + 4); - GUEST_SYNC(3); - /* Hardware-breakpoint + software-breakpoint */ reset_debug_state(); - install_hw_bp(PC(bp_brk)); + install_hw_bp(bpn, PC(bp_brk)); asm volatile("bp_brk: brk #0"); GUEST_ASSERT_EQ(sw_bp_addr, PC(bp_brk)); GUEST_ASSERT_EQ(hw_bp_addr, PC(bp_brk)); - GUEST_SYNC(4); - /* Watchpoint */ reset_debug_state(); - install_wp(PC(write_data)); + install_wp(wpn, PC(write_data)); write_data = 'x'; GUEST_ASSERT_EQ(write_data, 'x'); GUEST_ASSERT_EQ(wp_data_addr, PC(write_data)); - GUEST_SYNC(5); - /* Single-step */ reset_debug_state(); install_ss(); @@ -160,8 +283,6 @@ static void guest_code(void) GUEST_ASSERT_EQ(ss_addr[1], PC(ss_start) + 4); GUEST_ASSERT_EQ(ss_addr[2], PC(ss_start) + 8); - GUEST_SYNC(6); - /* OS Lock does not block software-breakpoint */ reset_debug_state(); enable_os_lock(); @@ -169,30 +290,24 @@ static void guest_code(void) asm volatile("sw_bp2: brk #0"); GUEST_ASSERT_EQ(sw_bp_addr, PC(sw_bp2)); - GUEST_SYNC(7); - /* OS Lock blocking hardware-breakpoint */ reset_debug_state(); enable_os_lock(); - install_hw_bp(PC(hw_bp2)); + install_hw_bp(bpn, PC(hw_bp2)); hw_bp_addr = 0; asm volatile("hw_bp2: nop"); GUEST_ASSERT_EQ(hw_bp_addr, 0); - GUEST_SYNC(8); - /* OS Lock blocking watchpoint */ reset_debug_state(); enable_os_lock(); write_data = '\0'; wp_data_addr = 0; - install_wp(PC(write_data)); + install_wp(wpn, PC(write_data)); write_data = 'x'; GUEST_ASSERT_EQ(write_data, 'x'); GUEST_ASSERT_EQ(wp_data_addr, 0); - GUEST_SYNC(9); - /* OS Lock blocking single-step */ reset_debug_state(); enable_os_lock(); @@ -205,6 +320,27 @@ static void guest_code(void) : : : "x0"); GUEST_ASSERT_EQ(ss_addr[0], 0); + /* Linked hardware-breakpoint */ + hw_bp_addr = 0; + reset_debug_state(); + install_hw_bp_ctx(bpn, ctx_bpn, PC(hw_bp_ctx), ctx); + /* Set context id */ + write_sysreg(ctx, contextidr_el1); + isb(); + asm volatile("hw_bp_ctx: nop"); + write_sysreg(0, contextidr_el1); + GUEST_ASSERT_EQ(hw_bp_addr, PC(hw_bp_ctx)); + + /* Linked watchpoint */ + reset_debug_state(); + install_wp_ctx(wpn, ctx_bpn, PC(write_data), ctx); + /* Set context id */ + write_sysreg(ctx, contextidr_el1); + isb(); + write_data = 'x'; + GUEST_ASSERT_EQ(write_data, 'x'); + GUEST_ASSERT_EQ(wp_data_addr, PC(write_data)); + GUEST_DONE(); } @@ -239,11 +375,6 @@ static void guest_svc_handler(struct ex_regs *regs) svc_addr = regs->pc; } -enum single_step_op { - SINGLE_STEP_ENABLE = 0, - SINGLE_STEP_DISABLE = 1, -}; - static void guest_code_ss(int test_cnt) { uint64_t i; @@ -254,11 +385,19 @@ static void guest_code_ss(int test_cnt) w_bvr = i << 2; w_wvr = i << 2; - /* Enable Single Step execution */ - GUEST_SYNC(SINGLE_STEP_ENABLE); + /* + * Enable Single Step execution. Note! This _must_ be a bare + * ucall as the ucall() path uses atomic operations to manage + * the ucall structures, and the built-in "atomics" are usually + * implemented via exclusive access instructions. The exlusive + * monitor is cleared on ERET, and so taking debug exceptions + * during a LDREX=>STREX sequence will prevent forward progress + * and hang the guest/test. + */ + GUEST_UCALL_NONE(); /* - * The userspace will veriry that the pc is as expected during + * The userspace will verify that the pc is as expected during * single step execution between iter_ss_begin and iter_ss_end. */ asm volatile("iter_ss_begin:nop\n"); @@ -268,34 +407,27 @@ static void guest_code_ss(int test_cnt) bvr = read_sysreg(dbgbvr0_el1); wvr = read_sysreg(dbgwvr0_el1); + /* Userspace disables Single Step when the end is nigh. */ asm volatile("iter_ss_end:\n"); - /* Disable Single Step execution */ - GUEST_SYNC(SINGLE_STEP_DISABLE); - GUEST_ASSERT(bvr == w_bvr); GUEST_ASSERT(wvr == w_wvr); } GUEST_DONE(); } -static int debug_version(struct kvm_vcpu *vcpu) +static int debug_version(uint64_t id_aa64dfr0) { - uint64_t id_aa64dfr0; - - vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64DFR0_EL1), &id_aa64dfr0); - return id_aa64dfr0 & 0xf; + return FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_DEBUGVER), id_aa64dfr0); } -static void test_guest_debug_exceptions(void) +static void test_guest_debug_exceptions(uint8_t bpn, uint8_t wpn, uint8_t ctx_bpn) { struct kvm_vcpu *vcpu; struct kvm_vm *vm; struct ucall uc; - int stage; vm = vm_create_with_one_vcpu(&vcpu, guest_code); - ucall_init(vm, NULL); vm_init_descriptor_tables(vm); vcpu_init_descriptor_tables(vcpu); @@ -311,23 +443,19 @@ static void test_guest_debug_exceptions(void) vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, ESR_EC_SVC64, guest_svc_handler); - for (stage = 0; stage < 11; stage++) { - vcpu_run(vcpu); - - switch (get_ucall(vcpu, &uc)) { - case UCALL_SYNC: - TEST_ASSERT(uc.args[1] == stage, - "Stage %d: Unexpected sync ucall, got %lx", - stage, (ulong)uc.args[1]); - break; - case UCALL_ABORT: - REPORT_GUEST_ASSERT_2(uc, "values: %#lx, %#lx"); - break; - case UCALL_DONE: - goto done; - default: - TEST_FAIL("Unknown ucall %lu", uc.cmd); - } + /* Specify bpn/wpn/ctx_bpn to be tested */ + vcpu_args_set(vcpu, 3, bpn, wpn, ctx_bpn); + pr_debug("Use bpn#%d, wpn#%d and ctx_bpn#%d\n", bpn, wpn, ctx_bpn); + + vcpu_run(vcpu); + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT_2(uc, "values: %#lx, %#lx"); + break; + case UCALL_DONE: + goto done; + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); } done: @@ -346,7 +474,6 @@ void test_single_step_from_userspace(int test_cnt) struct kvm_guest_debug debug = {}; vm = vm_create_with_one_vcpu(&vcpu, guest_code_ss); - ucall_init(vm, NULL); run = vcpu->run; vcpu_args_set(vcpu, 1, test_cnt); @@ -361,18 +488,12 @@ void test_single_step_from_userspace(int test_cnt) break; } - TEST_ASSERT(cmd == UCALL_SYNC, + TEST_ASSERT(cmd == UCALL_NONE, "Unexpected ucall cmd 0x%lx", cmd); - if (uc.args[1] == SINGLE_STEP_ENABLE) { - debug.control = KVM_GUESTDBG_ENABLE | - KVM_GUESTDBG_SINGLESTEP; - ss_enable = true; - } else { - debug.control = SINGLE_STEP_DISABLE; - ss_enable = false; - } - + debug.control = KVM_GUESTDBG_ENABLE | + KVM_GUESTDBG_SINGLESTEP; + ss_enable = true; vcpu_guest_debug_set(vcpu, &debug); continue; } @@ -385,6 +506,14 @@ void test_single_step_from_userspace(int test_cnt) "Unexpected pc 0x%lx (expected 0x%lx)", pc, test_pc); + if ((pc + 4) == (uint64_t)&iter_ss_end) { + test_pc = 0; + debug.control = KVM_GUESTDBG_ENABLE; + ss_enable = false; + vcpu_guest_debug_set(vcpu, &debug); + continue; + } + /* * If the current pc is between iter_ss_bgin and * iter_ss_end, the pc for the next KVM_EXIT_DEBUG should @@ -400,6 +529,43 @@ void test_single_step_from_userspace(int test_cnt) kvm_vm_free(vm); } +/* + * Run debug testing using the various breakpoint#, watchpoint# and + * context-aware breakpoint# with the given ID_AA64DFR0_EL1 configuration. + */ +void test_guest_debug_exceptions_all(uint64_t aa64dfr0) +{ + uint8_t brp_num, wrp_num, ctx_brp_num, normal_brp_num, ctx_brp_base; + int b, w, c; + + /* Number of breakpoints */ + brp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_BRPS), aa64dfr0) + 1; + __TEST_REQUIRE(brp_num >= 2, "At least two breakpoints are required"); + + /* Number of watchpoints */ + wrp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_WRPS), aa64dfr0) + 1; + + /* Number of context aware breakpoints */ + ctx_brp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_CTX_CMPS), aa64dfr0) + 1; + + pr_debug("%s brp_num:%d, wrp_num:%d, ctx_brp_num:%d\n", __func__, + brp_num, wrp_num, ctx_brp_num); + + /* Number of normal (non-context aware) breakpoints */ + normal_brp_num = brp_num - ctx_brp_num; + + /* Lowest context aware breakpoint number */ + ctx_brp_base = normal_brp_num; + + /* Run tests with all supported breakpoints/watchpoints */ + for (c = ctx_brp_base; c < ctx_brp_base + ctx_brp_num; c++) { + for (b = 0; b < normal_brp_num; b++) { + for (w = 0; w < wrp_num; w++) + test_guest_debug_exceptions(b, w, c); + } + } +} + static void help(char *name) { puts(""); @@ -414,16 +580,18 @@ int main(int argc, char *argv[]) struct kvm_vm *vm; int opt; int ss_iteration = 10000; + uint64_t aa64dfr0; vm = vm_create_with_one_vcpu(&vcpu, guest_code); - __TEST_REQUIRE(debug_version(vcpu) >= 6, + vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64DFR0_EL1), &aa64dfr0); + __TEST_REQUIRE(debug_version(aa64dfr0) >= 6, "Armv8 debug architecture not supported."); kvm_vm_free(vm); while ((opt = getopt(argc, argv, "i:")) != -1) { switch (opt) { case 'i': - ss_iteration = atoi(optarg); + ss_iteration = atoi_positive("Number of iterations", optarg); break; case 'h': default: @@ -432,7 +600,7 @@ int main(int argc, char *argv[]) } } - test_guest_debug_exceptions(); + test_guest_debug_exceptions_all(aa64dfr0); test_single_step_from_userspace(ss_iteration); return 0; diff --git a/tools/testing/selftests/kvm/aarch64/hypercalls.c b/tools/testing/selftests/kvm/aarch64/hypercalls.c index a39da3fe4952..bef1499fb465 100644 --- a/tools/testing/selftests/kvm/aarch64/hypercalls.c +++ b/tools/testing/selftests/kvm/aarch64/hypercalls.c @@ -236,7 +236,6 @@ static struct kvm_vm *test_vm_create(struct kvm_vcpu **vcpu) vm = vm_create_with_one_vcpu(vcpu, guest_code); - ucall_init(vm, NULL); steal_time_init(*vcpu); return vm; @@ -306,8 +305,6 @@ static void test_run(void) int main(void) { - setbuf(stdout, NULL); - test_run(); return 0; } diff --git a/tools/testing/selftests/kvm/aarch64/page_fault_test.c b/tools/testing/selftests/kvm/aarch64/page_fault_test.c new file mode 100644 index 000000000000..95d22cfb7b41 --- /dev/null +++ b/tools/testing/selftests/kvm/aarch64/page_fault_test.c @@ -0,0 +1,1117 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * page_fault_test.c - Test stage 2 faults. + * + * This test tries different combinations of guest accesses (e.g., write, + * S1PTW), backing source type (e.g., anon) and types of faults (e.g., read on + * hugetlbfs with a hole). It checks that the expected handling method is + * called (e.g., uffd faults with the right address and write/read flag). + */ + +#define _GNU_SOURCE +#include <linux/bitmap.h> +#include <fcntl.h> +#include <test_util.h> +#include <kvm_util.h> +#include <processor.h> +#include <asm/sysreg.h> +#include <linux/bitfield.h> +#include "guest_modes.h" +#include "userfaultfd_util.h" + +/* Guest virtual addresses that point to the test page and its PTE. */ +#define TEST_GVA 0xc0000000 +#define TEST_EXEC_GVA (TEST_GVA + 0x8) +#define TEST_PTE_GVA 0xb0000000 +#define TEST_DATA 0x0123456789ABCDEF + +static uint64_t *guest_test_memory = (uint64_t *)TEST_GVA; + +#define CMD_NONE (0) +#define CMD_SKIP_TEST (1ULL << 1) +#define CMD_HOLE_PT (1ULL << 2) +#define CMD_HOLE_DATA (1ULL << 3) +#define CMD_CHECK_WRITE_IN_DIRTY_LOG (1ULL << 4) +#define CMD_CHECK_S1PTW_WR_IN_DIRTY_LOG (1ULL << 5) +#define CMD_CHECK_NO_WRITE_IN_DIRTY_LOG (1ULL << 6) +#define CMD_CHECK_NO_S1PTW_WR_IN_DIRTY_LOG (1ULL << 7) +#define CMD_SET_PTE_AF (1ULL << 8) + +#define PREPARE_FN_NR 10 +#define CHECK_FN_NR 10 + +static struct event_cnt { + int mmio_exits; + int fail_vcpu_runs; + int uffd_faults; + /* uffd_faults is incremented from multiple threads. */ + pthread_mutex_t uffd_faults_mutex; +} events; + +struct test_desc { + const char *name; + uint64_t mem_mark_cmd; + /* Skip the test if any prepare function returns false */ + bool (*guest_prepare[PREPARE_FN_NR])(void); + void (*guest_test)(void); + void (*guest_test_check[CHECK_FN_NR])(void); + uffd_handler_t uffd_pt_handler; + uffd_handler_t uffd_data_handler; + void (*dabt_handler)(struct ex_regs *regs); + void (*iabt_handler)(struct ex_regs *regs); + void (*mmio_handler)(struct kvm_vm *vm, struct kvm_run *run); + void (*fail_vcpu_run_handler)(int ret); + uint32_t pt_memslot_flags; + uint32_t data_memslot_flags; + bool skip; + struct event_cnt expected_events; +}; + +struct test_params { + enum vm_mem_backing_src_type src_type; + struct test_desc *test_desc; +}; + +static inline void flush_tlb_page(uint64_t vaddr) +{ + uint64_t page = vaddr >> 12; + + dsb(ishst); + asm volatile("tlbi vaae1is, %0" :: "r" (page)); + dsb(ish); + isb(); +} + +static void guest_write64(void) +{ + uint64_t val; + + WRITE_ONCE(*guest_test_memory, TEST_DATA); + val = READ_ONCE(*guest_test_memory); + GUEST_ASSERT_EQ(val, TEST_DATA); +} + +/* Check the system for atomic instructions. */ +static bool guest_check_lse(void) +{ + uint64_t isar0 = read_sysreg(id_aa64isar0_el1); + uint64_t atomic; + + atomic = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64ISAR0_ATOMICS), isar0); + return atomic >= 2; +} + +static bool guest_check_dc_zva(void) +{ + uint64_t dczid = read_sysreg(dczid_el0); + uint64_t dzp = FIELD_GET(ARM64_FEATURE_MASK(DCZID_DZP), dczid); + + return dzp == 0; +} + +/* Compare and swap instruction. */ +static void guest_cas(void) +{ + uint64_t val; + + GUEST_ASSERT(guest_check_lse()); + asm volatile(".arch_extension lse\n" + "casal %0, %1, [%2]\n" + :: "r" (0), "r" (TEST_DATA), "r" (guest_test_memory)); + val = READ_ONCE(*guest_test_memory); + GUEST_ASSERT_EQ(val, TEST_DATA); +} + +static void guest_read64(void) +{ + uint64_t val; + + val = READ_ONCE(*guest_test_memory); + GUEST_ASSERT_EQ(val, 0); +} + +/* Address translation instruction */ +static void guest_at(void) +{ + uint64_t par; + + asm volatile("at s1e1r, %0" :: "r" (guest_test_memory)); + par = read_sysreg(par_el1); + isb(); + + /* Bit 1 indicates whether the AT was successful */ + GUEST_ASSERT_EQ(par & 1, 0); +} + +/* + * The size of the block written by "dc zva" is guaranteed to be between (2 << + * 0) and (2 << 9), which is safe in our case as we need the write to happen + * for at least a word, and not more than a page. + */ +static void guest_dc_zva(void) +{ + uint16_t val; + + asm volatile("dc zva, %0" :: "r" (guest_test_memory)); + dsb(ish); + val = READ_ONCE(*guest_test_memory); + GUEST_ASSERT_EQ(val, 0); +} + +/* + * Pre-indexing loads and stores don't have a valid syndrome (ESR_EL2.ISV==0). + * And that's special because KVM must take special care with those: they + * should still count as accesses for dirty logging or user-faulting, but + * should be handled differently on mmio. + */ +static void guest_ld_preidx(void) +{ + uint64_t val; + uint64_t addr = TEST_GVA - 8; + + /* + * This ends up accessing "TEST_GVA + 8 - 8", where "TEST_GVA - 8" is + * in a gap between memslots not backing by anything. + */ + asm volatile("ldr %0, [%1, #8]!" + : "=r" (val), "+r" (addr)); + GUEST_ASSERT_EQ(val, 0); + GUEST_ASSERT_EQ(addr, TEST_GVA); +} + +static void guest_st_preidx(void) +{ + uint64_t val = TEST_DATA; + uint64_t addr = TEST_GVA - 8; + + asm volatile("str %0, [%1, #8]!" + : "+r" (val), "+r" (addr)); + + GUEST_ASSERT_EQ(addr, TEST_GVA); + val = READ_ONCE(*guest_test_memory); +} + +static bool guest_set_ha(void) +{ + uint64_t mmfr1 = read_sysreg(id_aa64mmfr1_el1); + uint64_t hadbs, tcr; + + /* Skip if HA is not supported. */ + hadbs = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR1_HADBS), mmfr1); + if (hadbs == 0) + return false; + + tcr = read_sysreg(tcr_el1) | TCR_EL1_HA; + write_sysreg(tcr, tcr_el1); + isb(); + + return true; +} + +static bool guest_clear_pte_af(void) +{ + *((uint64_t *)TEST_PTE_GVA) &= ~PTE_AF; + flush_tlb_page(TEST_GVA); + + return true; +} + +static void guest_check_pte_af(void) +{ + dsb(ish); + GUEST_ASSERT_EQ(*((uint64_t *)TEST_PTE_GVA) & PTE_AF, PTE_AF); +} + +static void guest_check_write_in_dirty_log(void) +{ + GUEST_SYNC(CMD_CHECK_WRITE_IN_DIRTY_LOG); +} + +static void guest_check_no_write_in_dirty_log(void) +{ + GUEST_SYNC(CMD_CHECK_NO_WRITE_IN_DIRTY_LOG); +} + +static void guest_check_s1ptw_wr_in_dirty_log(void) +{ + GUEST_SYNC(CMD_CHECK_S1PTW_WR_IN_DIRTY_LOG); +} + +static void guest_exec(void) +{ + int (*code)(void) = (int (*)(void))TEST_EXEC_GVA; + int ret; + + ret = code(); + GUEST_ASSERT_EQ(ret, 0x77); +} + +static bool guest_prepare(struct test_desc *test) +{ + bool (*prepare_fn)(void); + int i; + + for (i = 0; i < PREPARE_FN_NR; i++) { + prepare_fn = test->guest_prepare[i]; + if (prepare_fn && !prepare_fn()) + return false; + } + + return true; +} + +static void guest_test_check(struct test_desc *test) +{ + void (*check_fn)(void); + int i; + + for (i = 0; i < CHECK_FN_NR; i++) { + check_fn = test->guest_test_check[i]; + if (check_fn) + check_fn(); + } +} + +static void guest_code(struct test_desc *test) +{ + if (!guest_prepare(test)) + GUEST_SYNC(CMD_SKIP_TEST); + + GUEST_SYNC(test->mem_mark_cmd); + + if (test->guest_test) + test->guest_test(); + + guest_test_check(test); + GUEST_DONE(); +} + +static void no_dabt_handler(struct ex_regs *regs) +{ + GUEST_ASSERT_1(false, read_sysreg(far_el1)); +} + +static void no_iabt_handler(struct ex_regs *regs) +{ + GUEST_ASSERT_1(false, regs->pc); +} + +static struct uffd_args { + char *copy; + void *hva; + uint64_t paging_size; +} pt_args, data_args; + +/* Returns true to continue the test, and false if it should be skipped. */ +static int uffd_generic_handler(int uffd_mode, int uffd, struct uffd_msg *msg, + struct uffd_args *args, bool expect_write) +{ + uint64_t addr = msg->arg.pagefault.address; + uint64_t flags = msg->arg.pagefault.flags; + struct uffdio_copy copy; + int ret; + + TEST_ASSERT(uffd_mode == UFFDIO_REGISTER_MODE_MISSING, + "The only expected UFFD mode is MISSING"); + ASSERT_EQ(!!(flags & UFFD_PAGEFAULT_FLAG_WRITE), expect_write); + ASSERT_EQ(addr, (uint64_t)args->hva); + + pr_debug("uffd fault: addr=%p write=%d\n", + (void *)addr, !!(flags & UFFD_PAGEFAULT_FLAG_WRITE)); + + copy.src = (uint64_t)args->copy; + copy.dst = addr; + copy.len = args->paging_size; + copy.mode = 0; + + ret = ioctl(uffd, UFFDIO_COPY, ©); + if (ret == -1) { + pr_info("Failed UFFDIO_COPY in 0x%lx with errno: %d\n", + addr, errno); + return ret; + } + + pthread_mutex_lock(&events.uffd_faults_mutex); + events.uffd_faults += 1; + pthread_mutex_unlock(&events.uffd_faults_mutex); + return 0; +} + +static int uffd_pt_write_handler(int mode, int uffd, struct uffd_msg *msg) +{ + return uffd_generic_handler(mode, uffd, msg, &pt_args, true); +} + +static int uffd_data_write_handler(int mode, int uffd, struct uffd_msg *msg) +{ + return uffd_generic_handler(mode, uffd, msg, &data_args, true); +} + +static int uffd_data_read_handler(int mode, int uffd, struct uffd_msg *msg) +{ + return uffd_generic_handler(mode, uffd, msg, &data_args, false); +} + +static void setup_uffd_args(struct userspace_mem_region *region, + struct uffd_args *args) +{ + args->hva = (void *)region->region.userspace_addr; + args->paging_size = region->region.memory_size; + + args->copy = malloc(args->paging_size); + TEST_ASSERT(args->copy, "Failed to allocate data copy."); + memcpy(args->copy, args->hva, args->paging_size); +} + +static void setup_uffd(struct kvm_vm *vm, struct test_params *p, + struct uffd_desc **pt_uffd, struct uffd_desc **data_uffd) +{ + struct test_desc *test = p->test_desc; + int uffd_mode = UFFDIO_REGISTER_MODE_MISSING; + + setup_uffd_args(vm_get_mem_region(vm, MEM_REGION_PT), &pt_args); + setup_uffd_args(vm_get_mem_region(vm, MEM_REGION_TEST_DATA), &data_args); + + *pt_uffd = NULL; + if (test->uffd_pt_handler) + *pt_uffd = uffd_setup_demand_paging(uffd_mode, 0, + pt_args.hva, + pt_args.paging_size, + test->uffd_pt_handler); + + *data_uffd = NULL; + if (test->uffd_data_handler) + *data_uffd = uffd_setup_demand_paging(uffd_mode, 0, + data_args.hva, + data_args.paging_size, + test->uffd_data_handler); +} + +static void free_uffd(struct test_desc *test, struct uffd_desc *pt_uffd, + struct uffd_desc *data_uffd) +{ + if (test->uffd_pt_handler) + uffd_stop_demand_paging(pt_uffd); + if (test->uffd_data_handler) + uffd_stop_demand_paging(data_uffd); + + free(pt_args.copy); + free(data_args.copy); +} + +static int uffd_no_handler(int mode, int uffd, struct uffd_msg *msg) +{ + TEST_FAIL("There was no UFFD fault expected."); + return -1; +} + +/* Returns false if the test should be skipped. */ +static bool punch_hole_in_backing_store(struct kvm_vm *vm, + struct userspace_mem_region *region) +{ + void *hva = (void *)region->region.userspace_addr; + uint64_t paging_size = region->region.memory_size; + int ret, fd = region->fd; + + if (fd != -1) { + ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, + 0, paging_size); + TEST_ASSERT(ret == 0, "fallocate failed\n"); + } else { + ret = madvise(hva, paging_size, MADV_DONTNEED); + TEST_ASSERT(ret == 0, "madvise failed\n"); + } + + return true; +} + +static void mmio_on_test_gpa_handler(struct kvm_vm *vm, struct kvm_run *run) +{ + struct userspace_mem_region *region; + void *hva; + + region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA); + hva = (void *)region->region.userspace_addr; + + ASSERT_EQ(run->mmio.phys_addr, region->region.guest_phys_addr); + + memcpy(hva, run->mmio.data, run->mmio.len); + events.mmio_exits += 1; +} + +static void mmio_no_handler(struct kvm_vm *vm, struct kvm_run *run) +{ + uint64_t data; + + memcpy(&data, run->mmio.data, sizeof(data)); + pr_debug("addr=%lld len=%d w=%d data=%lx\n", + run->mmio.phys_addr, run->mmio.len, + run->mmio.is_write, data); + TEST_FAIL("There was no MMIO exit expected."); +} + +static bool check_write_in_dirty_log(struct kvm_vm *vm, + struct userspace_mem_region *region, + uint64_t host_pg_nr) +{ + unsigned long *bmap; + bool first_page_dirty; + uint64_t size = region->region.memory_size; + + /* getpage_size() is not always equal to vm->page_size */ + bmap = bitmap_zalloc(size / getpagesize()); + kvm_vm_get_dirty_log(vm, region->region.slot, bmap); + first_page_dirty = test_bit(host_pg_nr, bmap); + free(bmap); + return first_page_dirty; +} + +/* Returns true to continue the test, and false if it should be skipped. */ +static bool handle_cmd(struct kvm_vm *vm, int cmd) +{ + struct userspace_mem_region *data_region, *pt_region; + bool continue_test = true; + + data_region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA); + pt_region = vm_get_mem_region(vm, MEM_REGION_PT); + + if (cmd == CMD_SKIP_TEST) + continue_test = false; + + if (cmd & CMD_HOLE_PT) + continue_test = punch_hole_in_backing_store(vm, pt_region); + if (cmd & CMD_HOLE_DATA) + continue_test = punch_hole_in_backing_store(vm, data_region); + if (cmd & CMD_CHECK_WRITE_IN_DIRTY_LOG) + TEST_ASSERT(check_write_in_dirty_log(vm, data_region, 0), + "Missing write in dirty log"); + if (cmd & CMD_CHECK_S1PTW_WR_IN_DIRTY_LOG) + TEST_ASSERT(check_write_in_dirty_log(vm, pt_region, 0), + "Missing s1ptw write in dirty log"); + if (cmd & CMD_CHECK_NO_WRITE_IN_DIRTY_LOG) + TEST_ASSERT(!check_write_in_dirty_log(vm, data_region, 0), + "Unexpected write in dirty log"); + if (cmd & CMD_CHECK_NO_S1PTW_WR_IN_DIRTY_LOG) + TEST_ASSERT(!check_write_in_dirty_log(vm, pt_region, 0), + "Unexpected s1ptw write in dirty log"); + + return continue_test; +} + +void fail_vcpu_run_no_handler(int ret) +{ + TEST_FAIL("Unexpected vcpu run failure\n"); +} + +void fail_vcpu_run_mmio_no_syndrome_handler(int ret) +{ + TEST_ASSERT(errno == ENOSYS, + "The mmio handler should have returned not implemented."); + events.fail_vcpu_runs += 1; +} + +typedef uint32_t aarch64_insn_t; +extern aarch64_insn_t __exec_test[2]; + +noinline void __return_0x77(void) +{ + asm volatile("__exec_test: mov x0, #0x77\n" + "ret\n"); +} + +/* + * Note that this function runs on the host before the test VM starts: there's + * no need to sync the D$ and I$ caches. + */ +static void load_exec_code_for_test(struct kvm_vm *vm) +{ + uint64_t *code; + struct userspace_mem_region *region; + void *hva; + + region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA); + hva = (void *)region->region.userspace_addr; + + assert(TEST_EXEC_GVA > TEST_GVA); + code = hva + TEST_EXEC_GVA - TEST_GVA; + memcpy(code, __exec_test, sizeof(__exec_test)); +} + +static void setup_abort_handlers(struct kvm_vm *vm, struct kvm_vcpu *vcpu, + struct test_desc *test) +{ + vm_init_descriptor_tables(vm); + vcpu_init_descriptor_tables(vcpu); + + vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, + ESR_EC_DABT, no_dabt_handler); + vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, + ESR_EC_IABT, no_iabt_handler); +} + +static void setup_gva_maps(struct kvm_vm *vm) +{ + struct userspace_mem_region *region; + uint64_t pte_gpa; + + region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA); + /* Map TEST_GVA first. This will install a new PTE. */ + virt_pg_map(vm, TEST_GVA, region->region.guest_phys_addr); + /* Then map TEST_PTE_GVA to the above PTE. */ + pte_gpa = addr_hva2gpa(vm, virt_get_pte_hva(vm, TEST_GVA)); + virt_pg_map(vm, TEST_PTE_GVA, pte_gpa); +} + +enum pf_test_memslots { + CODE_AND_DATA_MEMSLOT, + PAGE_TABLE_MEMSLOT, + TEST_DATA_MEMSLOT, +}; + +/* + * Create a memslot for code and data at pfn=0, and test-data and PT ones + * at max_gfn. + */ +static void setup_memslots(struct kvm_vm *vm, struct test_params *p) +{ + uint64_t backing_src_pagesz = get_backing_src_pagesz(p->src_type); + uint64_t guest_page_size = vm->page_size; + uint64_t max_gfn = vm_compute_max_gfn(vm); + /* Enough for 2M of code when using 4K guest pages. */ + uint64_t code_npages = 512; + uint64_t pt_size, data_size, data_gpa; + + /* + * This test requires 1 pgd, 2 pud, 4 pmd, and 6 pte pages when using + * VM_MODE_P48V48_4K. Note that the .text takes ~1.6MBs. That's 13 + * pages. VM_MODE_P48V48_4K is the mode with most PT pages; let's use + * twice that just in case. + */ + pt_size = 26 * guest_page_size; + + /* memslot sizes and gpa's must be aligned to the backing page size */ + pt_size = align_up(pt_size, backing_src_pagesz); + data_size = align_up(guest_page_size, backing_src_pagesz); + data_gpa = (max_gfn * guest_page_size) - data_size; + data_gpa = align_down(data_gpa, backing_src_pagesz); + + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0, + CODE_AND_DATA_MEMSLOT, code_npages, 0); + vm->memslots[MEM_REGION_CODE] = CODE_AND_DATA_MEMSLOT; + vm->memslots[MEM_REGION_DATA] = CODE_AND_DATA_MEMSLOT; + + vm_userspace_mem_region_add(vm, p->src_type, data_gpa - pt_size, + PAGE_TABLE_MEMSLOT, pt_size / guest_page_size, + p->test_desc->pt_memslot_flags); + vm->memslots[MEM_REGION_PT] = PAGE_TABLE_MEMSLOT; + + vm_userspace_mem_region_add(vm, p->src_type, data_gpa, TEST_DATA_MEMSLOT, + data_size / guest_page_size, + p->test_desc->data_memslot_flags); + vm->memslots[MEM_REGION_TEST_DATA] = TEST_DATA_MEMSLOT; +} + +static void setup_ucall(struct kvm_vm *vm) +{ + struct userspace_mem_region *region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA); + + ucall_init(vm, region->region.guest_phys_addr + region->region.memory_size); +} + +static void setup_default_handlers(struct test_desc *test) +{ + if (!test->mmio_handler) + test->mmio_handler = mmio_no_handler; + + if (!test->fail_vcpu_run_handler) + test->fail_vcpu_run_handler = fail_vcpu_run_no_handler; +} + +static void check_event_counts(struct test_desc *test) +{ + ASSERT_EQ(test->expected_events.uffd_faults, events.uffd_faults); + ASSERT_EQ(test->expected_events.mmio_exits, events.mmio_exits); + ASSERT_EQ(test->expected_events.fail_vcpu_runs, events.fail_vcpu_runs); +} + +static void print_test_banner(enum vm_guest_mode mode, struct test_params *p) +{ + struct test_desc *test = p->test_desc; + + pr_debug("Test: %s\n", test->name); + pr_debug("Testing guest mode: %s\n", vm_guest_mode_string(mode)); + pr_debug("Testing memory backing src type: %s\n", + vm_mem_backing_src_alias(p->src_type)->name); +} + +static void reset_event_counts(void) +{ + memset(&events, 0, sizeof(events)); +} + +/* + * This function either succeeds, skips the test (after setting test->skip), or + * fails with a TEST_FAIL that aborts all tests. + */ +static void vcpu_run_loop(struct kvm_vm *vm, struct kvm_vcpu *vcpu, + struct test_desc *test) +{ + struct kvm_run *run; + struct ucall uc; + int ret; + + run = vcpu->run; + + for (;;) { + ret = _vcpu_run(vcpu); + if (ret) { + test->fail_vcpu_run_handler(ret); + goto done; + } + + switch (get_ucall(vcpu, &uc)) { + case UCALL_SYNC: + if (!handle_cmd(vm, uc.args[1])) { + test->skip = true; + goto done; + } + break; + case UCALL_ABORT: + REPORT_GUEST_ASSERT_2(uc, "values: %#lx, %#lx"); + break; + case UCALL_DONE: + goto done; + case UCALL_NONE: + if (run->exit_reason == KVM_EXIT_MMIO) + test->mmio_handler(vm, run); + break; + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); + } + } + +done: + pr_debug(test->skip ? "Skipped.\n" : "Done.\n"); +} + +static void run_test(enum vm_guest_mode mode, void *arg) +{ + struct test_params *p = (struct test_params *)arg; + struct test_desc *test = p->test_desc; + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + struct uffd_desc *pt_uffd, *data_uffd; + + print_test_banner(mode, p); + + vm = ____vm_create(mode); + setup_memslots(vm, p); + kvm_vm_elf_load(vm, program_invocation_name); + setup_ucall(vm); + vcpu = vm_vcpu_add(vm, 0, guest_code); + + setup_gva_maps(vm); + + reset_event_counts(); + + /* + * Set some code in the data memslot for the guest to execute (only + * applicable to the EXEC tests). This has to be done before + * setup_uffd() as that function copies the memslot data for the uffd + * handler. + */ + load_exec_code_for_test(vm); + setup_uffd(vm, p, &pt_uffd, &data_uffd); + setup_abort_handlers(vm, vcpu, test); + setup_default_handlers(test); + vcpu_args_set(vcpu, 1, test); + + vcpu_run_loop(vm, vcpu, test); + + kvm_vm_free(vm); + free_uffd(test, pt_uffd, data_uffd); + + /* + * Make sure we check the events after the uffd threads have exited, + * which means they updated their respective event counters. + */ + if (!test->skip) + check_event_counts(test); +} + +static void help(char *name) +{ + puts(""); + printf("usage: %s [-h] [-s mem-type]\n", name); + puts(""); + guest_modes_help(); + backing_src_help("-s"); + puts(""); +} + +#define SNAME(s) #s +#define SCAT2(a, b) SNAME(a ## _ ## b) +#define SCAT3(a, b, c) SCAT2(a, SCAT2(b, c)) +#define SCAT4(a, b, c, d) SCAT2(a, SCAT3(b, c, d)) + +#define _CHECK(_test) _CHECK_##_test +#define _PREPARE(_test) _PREPARE_##_test +#define _PREPARE_guest_read64 NULL +#define _PREPARE_guest_ld_preidx NULL +#define _PREPARE_guest_write64 NULL +#define _PREPARE_guest_st_preidx NULL +#define _PREPARE_guest_exec NULL +#define _PREPARE_guest_at NULL +#define _PREPARE_guest_dc_zva guest_check_dc_zva +#define _PREPARE_guest_cas guest_check_lse + +/* With or without access flag checks */ +#define _PREPARE_with_af guest_set_ha, guest_clear_pte_af +#define _PREPARE_no_af NULL +#define _CHECK_with_af guest_check_pte_af +#define _CHECK_no_af NULL + +/* Performs an access and checks that no faults were triggered. */ +#define TEST_ACCESS(_access, _with_af, _mark_cmd) \ +{ \ + .name = SCAT3(_access, _with_af, #_mark_cmd), \ + .guest_prepare = { _PREPARE(_with_af), \ + _PREPARE(_access) }, \ + .mem_mark_cmd = _mark_cmd, \ + .guest_test = _access, \ + .guest_test_check = { _CHECK(_with_af) }, \ + .expected_events = { 0 }, \ +} + +#define TEST_UFFD(_access, _with_af, _mark_cmd, \ + _uffd_data_handler, _uffd_pt_handler, _uffd_faults) \ +{ \ + .name = SCAT4(uffd, _access, _with_af, #_mark_cmd), \ + .guest_prepare = { _PREPARE(_with_af), \ + _PREPARE(_access) }, \ + .guest_test = _access, \ + .mem_mark_cmd = _mark_cmd, \ + .guest_test_check = { _CHECK(_with_af) }, \ + .uffd_data_handler = _uffd_data_handler, \ + .uffd_pt_handler = _uffd_pt_handler, \ + .expected_events = { .uffd_faults = _uffd_faults, }, \ +} + +#define TEST_DIRTY_LOG(_access, _with_af, _test_check) \ +{ \ + .name = SCAT3(dirty_log, _access, _with_af), \ + .data_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \ + .pt_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \ + .guest_prepare = { _PREPARE(_with_af), \ + _PREPARE(_access) }, \ + .guest_test = _access, \ + .guest_test_check = { _CHECK(_with_af), _test_check, \ + guest_check_s1ptw_wr_in_dirty_log}, \ + .expected_events = { 0 }, \ +} + +#define TEST_UFFD_AND_DIRTY_LOG(_access, _with_af, _uffd_data_handler, \ + _uffd_faults, _test_check) \ +{ \ + .name = SCAT3(uffd_and_dirty_log, _access, _with_af), \ + .data_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \ + .pt_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \ + .guest_prepare = { _PREPARE(_with_af), \ + _PREPARE(_access) }, \ + .guest_test = _access, \ + .mem_mark_cmd = CMD_HOLE_DATA | CMD_HOLE_PT, \ + .guest_test_check = { _CHECK(_with_af), _test_check }, \ + .uffd_data_handler = _uffd_data_handler, \ + .uffd_pt_handler = uffd_pt_write_handler, \ + .expected_events = { .uffd_faults = _uffd_faults, }, \ +} + +#define TEST_RO_MEMSLOT(_access, _mmio_handler, _mmio_exits) \ +{ \ + .name = SCAT3(ro_memslot, _access, _with_af), \ + .data_memslot_flags = KVM_MEM_READONLY, \ + .guest_prepare = { _PREPARE(_access) }, \ + .guest_test = _access, \ + .mmio_handler = _mmio_handler, \ + .expected_events = { .mmio_exits = _mmio_exits }, \ +} + +#define TEST_RO_MEMSLOT_NO_SYNDROME(_access) \ +{ \ + .name = SCAT2(ro_memslot_no_syndrome, _access), \ + .data_memslot_flags = KVM_MEM_READONLY, \ + .guest_test = _access, \ + .fail_vcpu_run_handler = fail_vcpu_run_mmio_no_syndrome_handler, \ + .expected_events = { .fail_vcpu_runs = 1 }, \ +} + +#define TEST_RO_MEMSLOT_AND_DIRTY_LOG(_access, _mmio_handler, _mmio_exits, \ + _test_check) \ +{ \ + .name = SCAT3(ro_memslot, _access, _with_af), \ + .data_memslot_flags = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES, \ + .pt_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \ + .guest_prepare = { _PREPARE(_access) }, \ + .guest_test = _access, \ + .guest_test_check = { _test_check }, \ + .mmio_handler = _mmio_handler, \ + .expected_events = { .mmio_exits = _mmio_exits}, \ +} + +#define TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(_access, _test_check) \ +{ \ + .name = SCAT2(ro_memslot_no_syn_and_dlog, _access), \ + .data_memslot_flags = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES, \ + .pt_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \ + .guest_test = _access, \ + .guest_test_check = { _test_check }, \ + .fail_vcpu_run_handler = fail_vcpu_run_mmio_no_syndrome_handler, \ + .expected_events = { .fail_vcpu_runs = 1 }, \ +} + +#define TEST_RO_MEMSLOT_AND_UFFD(_access, _mmio_handler, _mmio_exits, \ + _uffd_data_handler, _uffd_faults) \ +{ \ + .name = SCAT2(ro_memslot_uffd, _access), \ + .data_memslot_flags = KVM_MEM_READONLY, \ + .mem_mark_cmd = CMD_HOLE_DATA | CMD_HOLE_PT, \ + .guest_prepare = { _PREPARE(_access) }, \ + .guest_test = _access, \ + .uffd_data_handler = _uffd_data_handler, \ + .uffd_pt_handler = uffd_pt_write_handler, \ + .mmio_handler = _mmio_handler, \ + .expected_events = { .mmio_exits = _mmio_exits, \ + .uffd_faults = _uffd_faults }, \ +} + +#define TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(_access, _uffd_data_handler, \ + _uffd_faults) \ +{ \ + .name = SCAT2(ro_memslot_no_syndrome, _access), \ + .data_memslot_flags = KVM_MEM_READONLY, \ + .mem_mark_cmd = CMD_HOLE_DATA | CMD_HOLE_PT, \ + .guest_test = _access, \ + .uffd_data_handler = _uffd_data_handler, \ + .uffd_pt_handler = uffd_pt_write_handler, \ + .fail_vcpu_run_handler = fail_vcpu_run_mmio_no_syndrome_handler, \ + .expected_events = { .fail_vcpu_runs = 1, \ + .uffd_faults = _uffd_faults }, \ +} + +static struct test_desc tests[] = { + + /* Check that HW is setting the Access Flag (AF) (sanity checks). */ + TEST_ACCESS(guest_read64, with_af, CMD_NONE), + TEST_ACCESS(guest_ld_preidx, with_af, CMD_NONE), + TEST_ACCESS(guest_cas, with_af, CMD_NONE), + TEST_ACCESS(guest_write64, with_af, CMD_NONE), + TEST_ACCESS(guest_st_preidx, with_af, CMD_NONE), + TEST_ACCESS(guest_dc_zva, with_af, CMD_NONE), + TEST_ACCESS(guest_exec, with_af, CMD_NONE), + + /* + * Punch a hole in the data backing store, and then try multiple + * accesses: reads should rturn zeroes, and writes should + * re-populate the page. Moreover, the test also check that no + * exception was generated in the guest. Note that this + * reading/writing behavior is the same as reading/writing a + * punched page (with fallocate(FALLOC_FL_PUNCH_HOLE)) from + * userspace. + */ + TEST_ACCESS(guest_read64, no_af, CMD_HOLE_DATA), + TEST_ACCESS(guest_cas, no_af, CMD_HOLE_DATA), + TEST_ACCESS(guest_ld_preidx, no_af, CMD_HOLE_DATA), + TEST_ACCESS(guest_write64, no_af, CMD_HOLE_DATA), + TEST_ACCESS(guest_st_preidx, no_af, CMD_HOLE_DATA), + TEST_ACCESS(guest_at, no_af, CMD_HOLE_DATA), + TEST_ACCESS(guest_dc_zva, no_af, CMD_HOLE_DATA), + + /* + * Punch holes in the data and PT backing stores and mark them for + * userfaultfd handling. This should result in 2 faults: the access + * on the data backing store, and its respective S1 page table walk + * (S1PTW). + */ + TEST_UFFD(guest_read64, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_read_handler, uffd_pt_write_handler, 2), + /* no_af should also lead to a PT write. */ + TEST_UFFD(guest_read64, no_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_read_handler, uffd_pt_write_handler, 2), + /* Note how that cas invokes the read handler. */ + TEST_UFFD(guest_cas, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_read_handler, uffd_pt_write_handler, 2), + /* + * Can't test guest_at with_af as it's IMPDEF whether the AF is set. + * The S1PTW fault should still be marked as a write. + */ + TEST_UFFD(guest_at, no_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_read_handler, uffd_pt_write_handler, 1), + TEST_UFFD(guest_ld_preidx, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_read_handler, uffd_pt_write_handler, 2), + TEST_UFFD(guest_write64, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_write_handler, uffd_pt_write_handler, 2), + TEST_UFFD(guest_dc_zva, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_write_handler, uffd_pt_write_handler, 2), + TEST_UFFD(guest_st_preidx, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_write_handler, uffd_pt_write_handler, 2), + TEST_UFFD(guest_exec, with_af, CMD_HOLE_DATA | CMD_HOLE_PT, + uffd_data_read_handler, uffd_pt_write_handler, 2), + + /* + * Try accesses when the data and PT memory regions are both + * tracked for dirty logging. + */ + TEST_DIRTY_LOG(guest_read64, with_af, guest_check_no_write_in_dirty_log), + /* no_af should also lead to a PT write. */ + TEST_DIRTY_LOG(guest_read64, no_af, guest_check_no_write_in_dirty_log), + TEST_DIRTY_LOG(guest_ld_preidx, with_af, guest_check_no_write_in_dirty_log), + TEST_DIRTY_LOG(guest_at, no_af, guest_check_no_write_in_dirty_log), + TEST_DIRTY_LOG(guest_exec, with_af, guest_check_no_write_in_dirty_log), + TEST_DIRTY_LOG(guest_write64, with_af, guest_check_write_in_dirty_log), + TEST_DIRTY_LOG(guest_cas, with_af, guest_check_write_in_dirty_log), + TEST_DIRTY_LOG(guest_dc_zva, with_af, guest_check_write_in_dirty_log), + TEST_DIRTY_LOG(guest_st_preidx, with_af, guest_check_write_in_dirty_log), + + /* + * Access when the data and PT memory regions are both marked for + * dirty logging and UFFD at the same time. The expected result is + * that writes should mark the dirty log and trigger a userfaultfd + * write fault. Reads/execs should result in a read userfaultfd + * fault, and nothing in the dirty log. Any S1PTW should result in + * a write in the dirty log and a userfaultfd write. + */ + TEST_UFFD_AND_DIRTY_LOG(guest_read64, with_af, uffd_data_read_handler, 2, + guest_check_no_write_in_dirty_log), + /* no_af should also lead to a PT write. */ + TEST_UFFD_AND_DIRTY_LOG(guest_read64, no_af, uffd_data_read_handler, 2, + guest_check_no_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_ld_preidx, with_af, uffd_data_read_handler, + 2, guest_check_no_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_at, with_af, 0, 1, + guest_check_no_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_exec, with_af, uffd_data_read_handler, 2, + guest_check_no_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_write64, with_af, uffd_data_write_handler, + 2, guest_check_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_cas, with_af, uffd_data_read_handler, 2, + guest_check_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_dc_zva, with_af, uffd_data_write_handler, + 2, guest_check_write_in_dirty_log), + TEST_UFFD_AND_DIRTY_LOG(guest_st_preidx, with_af, + uffd_data_write_handler, 2, + guest_check_write_in_dirty_log), + + /* + * Try accesses when the data memory region is marked read-only + * (with KVM_MEM_READONLY). Writes with a syndrome result in an + * MMIO exit, writes with no syndrome (e.g., CAS) result in a + * failed vcpu run, and reads/execs with and without syndroms do + * not fault. + */ + TEST_RO_MEMSLOT(guest_read64, 0, 0), + TEST_RO_MEMSLOT(guest_ld_preidx, 0, 0), + TEST_RO_MEMSLOT(guest_at, 0, 0), + TEST_RO_MEMSLOT(guest_exec, 0, 0), + TEST_RO_MEMSLOT(guest_write64, mmio_on_test_gpa_handler, 1), + TEST_RO_MEMSLOT_NO_SYNDROME(guest_dc_zva), + TEST_RO_MEMSLOT_NO_SYNDROME(guest_cas), + TEST_RO_MEMSLOT_NO_SYNDROME(guest_st_preidx), + + /* + * Access when both the data region is both read-only and marked + * for dirty logging at the same time. The expected result is that + * for writes there should be no write in the dirty log. The + * readonly handling is the same as if the memslot was not marked + * for dirty logging: writes with a syndrome result in an MMIO + * exit, and writes with no syndrome result in a failed vcpu run. + */ + TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_read64, 0, 0, + guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_ld_preidx, 0, 0, + guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_at, 0, 0, + guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_exec, 0, 0, + guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_write64, mmio_on_test_gpa_handler, + 1, guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_dc_zva, + guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_cas, + guest_check_no_write_in_dirty_log), + TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_st_preidx, + guest_check_no_write_in_dirty_log), + + /* + * Access when the data region is both read-only and punched with + * holes tracked with userfaultfd. The expected result is the + * union of both userfaultfd and read-only behaviors. For example, + * write accesses result in a userfaultfd write fault and an MMIO + * exit. Writes with no syndrome result in a failed vcpu run and + * no userfaultfd write fault. Reads result in userfaultfd getting + * triggered. + */ + TEST_RO_MEMSLOT_AND_UFFD(guest_read64, 0, 0, + uffd_data_read_handler, 2), + TEST_RO_MEMSLOT_AND_UFFD(guest_ld_preidx, 0, 0, + uffd_data_read_handler, 2), + TEST_RO_MEMSLOT_AND_UFFD(guest_at, 0, 0, + uffd_no_handler, 1), + TEST_RO_MEMSLOT_AND_UFFD(guest_exec, 0, 0, + uffd_data_read_handler, 2), + TEST_RO_MEMSLOT_AND_UFFD(guest_write64, mmio_on_test_gpa_handler, 1, + uffd_data_write_handler, 2), + TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_cas, + uffd_data_read_handler, 2), + TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_dc_zva, + uffd_no_handler, 1), + TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_st_preidx, + uffd_no_handler, 1), + + { 0 } +}; + +static void for_each_test_and_guest_mode(enum vm_mem_backing_src_type src_type) +{ + struct test_desc *t; + + for (t = &tests[0]; t->name; t++) { + if (t->skip) + continue; + + struct test_params p = { + .src_type = src_type, + .test_desc = t, + }; + + for_each_guest_mode(run_test, &p); + } +} + +int main(int argc, char *argv[]) +{ + enum vm_mem_backing_src_type src_type; + int opt; + + setbuf(stdout, NULL); + + src_type = DEFAULT_VM_MEM_SRC; + + while ((opt = getopt(argc, argv, "hm:s:")) != -1) { + switch (opt) { + case 'm': + guest_modes_cmdline(optarg); + break; + case 's': + src_type = parse_backing_src_type(optarg); + break; + case 'h': + default: + help(argv[0]); + exit(0); + } + } + + for_each_test_and_guest_mode(src_type); + return 0; +} diff --git a/tools/testing/selftests/kvm/aarch64/psci_test.c b/tools/testing/selftests/kvm/aarch64/psci_test.c index e0b9e81a3e09..cfa36f387948 100644 --- a/tools/testing/selftests/kvm/aarch64/psci_test.c +++ b/tools/testing/selftests/kvm/aarch64/psci_test.c @@ -79,7 +79,6 @@ static struct kvm_vm *setup_vm(void *guest_code, struct kvm_vcpu **source, struct kvm_vm *vm; vm = vm_create(2); - ucall_init(vm, NULL); vm_ioctl(vm, KVM_ARM_PREFERRED_TARGET, &init); init.features[0] |= (1 << KVM_ARM_VCPU_PSCI_0_2); diff --git a/tools/testing/selftests/kvm/aarch64/vgic_init.c b/tools/testing/selftests/kvm/aarch64/vgic_init.c index 9c131d977a1b..eef816b80993 100644 --- a/tools/testing/selftests/kvm/aarch64/vgic_init.c +++ b/tools/testing/selftests/kvm/aarch64/vgic_init.c @@ -68,8 +68,6 @@ static void guest_code(void) /* we don't want to assert on run execution, hence that helper */ static int run_vcpu(struct kvm_vcpu *vcpu) { - ucall_init(vcpu->vm, NULL); - return __vcpu_run(vcpu) ? -errno : 0; } diff --git a/tools/testing/selftests/kvm/aarch64/vgic_irq.c b/tools/testing/selftests/kvm/aarch64/vgic_irq.c index 17417220a083..90d854e0fcff 100644 --- a/tools/testing/selftests/kvm/aarch64/vgic_irq.c +++ b/tools/testing/selftests/kvm/aarch64/vgic_irq.c @@ -756,7 +756,6 @@ static void test_vgic(uint32_t nr_irqs, bool level_sensitive, bool eoi_split) print_args(&args); vm = vm_create_with_one_vcpu(&vcpu, guest_code); - ucall_init(vm, NULL); vm_init_descriptor_tables(vm); vcpu_init_descriptor_tables(vcpu); @@ -818,22 +817,19 @@ int main(int argc, char **argv) int opt; bool eoi_split = false; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - while ((opt = getopt(argc, argv, "hn:e:l:")) != -1) { switch (opt) { case 'n': - nr_irqs = atoi(optarg); + nr_irqs = atoi_non_negative("Number of IRQs", optarg); if (nr_irqs > 1024 || nr_irqs % 32) help(argv[0]); break; case 'e': - eoi_split = (bool)atoi(optarg); + eoi_split = (bool)atoi_paranoid(optarg); default_args = false; break; case 'l': - level_sensitive = (bool)atoi(optarg); + level_sensitive = (bool)atoi_paranoid(optarg); default_args = false; break; case 'h': diff --git a/tools/testing/selftests/kvm/access_tracking_perf_test.c b/tools/testing/selftests/kvm/access_tracking_perf_test.c index 76c583a07ea2..3c7defd34f56 100644 --- a/tools/testing/selftests/kvm/access_tracking_perf_test.c +++ b/tools/testing/selftests/kvm/access_tracking_perf_test.c @@ -44,8 +44,9 @@ #include "kvm_util.h" #include "test_util.h" -#include "perf_test_util.h" +#include "memstress.h" #include "guest_modes.h" +#include "processor.h" /* Global variable used to synchronize all of the vCPU threads. */ static int iteration; @@ -58,9 +59,6 @@ static enum { ITERATION_MARK_IDLE, } iteration_work; -/* Set to true when vCPU threads should exit. */ -static bool done; - /* The iteration that was last completed by each vCPU. */ static int vcpu_last_completed_iteration[KVM_MAX_VCPUS]; @@ -126,7 +124,7 @@ static void mark_page_idle(int page_idle_fd, uint64_t pfn) } static void mark_vcpu_memory_idle(struct kvm_vm *vm, - struct perf_test_vcpu_args *vcpu_args) + struct memstress_vcpu_args *vcpu_args) { int vcpu_idx = vcpu_args->vcpu_idx; uint64_t base_gva = vcpu_args->gva; @@ -148,7 +146,7 @@ static void mark_vcpu_memory_idle(struct kvm_vm *vm, TEST_ASSERT(pagemap_fd > 0, "Failed to open pagemap."); for (page = 0; page < pages; page++) { - uint64_t gva = base_gva + page * perf_test_args.guest_page_size; + uint64_t gva = base_gva + page * memstress_args.guest_page_size; uint64_t pfn = lookup_pfn(pagemap_fd, vm, gva); if (!pfn) { @@ -180,16 +178,21 @@ static void mark_vcpu_memory_idle(struct kvm_vm *vm, * access tracking but low enough as to not make the test too brittle * over time and across architectures. * - * Note that when run in nested virtualization, this check will trigger - * much more frequently because TLB size is unlimited and since no flush - * happens, much more pages are cached there and guest won't see the - * "idle" bit cleared. + * When running the guest as a nested VM, "warn" instead of asserting + * as the TLB size is effectively unlimited and the KVM doesn't + * explicitly flush the TLB when aging SPTEs. As a result, more pages + * are cached and the guest won't see the "idle" bit cleared. */ - if (still_idle < pages / 10) - printf("WARNING: vCPU%d: Too many pages still idle (%" PRIu64 - "out of %" PRIu64 "), this will affect performance results" - ".\n", + if (still_idle >= pages / 10) { +#ifdef __x86_64__ + TEST_ASSERT(this_cpu_has(X86_FEATURE_HYPERVISOR), + "vCPU%d: Too many pages still idle (%lu out of %lu)", + vcpu_idx, still_idle, pages); +#endif + printf("WARNING: vCPU%d: Too many pages still idle (%lu out of %lu), " + "this will affect performance results.\n", vcpu_idx, still_idle, pages); + } close(page_idle_fd); close(pagemap_fd); @@ -211,7 +214,7 @@ static bool spin_wait_for_next_iteration(int *current_iteration) int last_iteration = *current_iteration; do { - if (READ_ONCE(done)) + if (READ_ONCE(memstress_args.stop_vcpus)) return false; *current_iteration = READ_ONCE(iteration); @@ -220,10 +223,10 @@ static bool spin_wait_for_next_iteration(int *current_iteration) return true; } -static void vcpu_thread_main(struct perf_test_vcpu_args *vcpu_args) +static void vcpu_thread_main(struct memstress_vcpu_args *vcpu_args) { struct kvm_vcpu *vcpu = vcpu_args->vcpu; - struct kvm_vm *vm = perf_test_args.vm; + struct kvm_vm *vm = memstress_args.vm; int vcpu_idx = vcpu_args->vcpu_idx; int current_iteration = 0; @@ -279,7 +282,7 @@ static void run_iteration(struct kvm_vm *vm, int nr_vcpus, const char *descripti static void access_memory(struct kvm_vm *vm, int nr_vcpus, enum access_type access, const char *description) { - perf_test_set_wr_fract(vm, (access == ACCESS_READ) ? INT_MAX : 1); + memstress_set_write_percent(vm, (access == ACCESS_READ) ? 0 : 100); iteration_work = ITERATION_ACCESS_MEMORY; run_iteration(vm, nr_vcpus, description); } @@ -303,10 +306,10 @@ static void run_test(enum vm_guest_mode mode, void *arg) struct kvm_vm *vm; int nr_vcpus = params->nr_vcpus; - vm = perf_test_create_vm(mode, nr_vcpus, params->vcpu_memory_bytes, 1, + vm = memstress_create_vm(mode, nr_vcpus, params->vcpu_memory_bytes, 1, params->backing_src, !overlap_memory_access); - perf_test_start_vcpu_threads(nr_vcpus, vcpu_thread_main); + memstress_start_vcpu_threads(nr_vcpus, vcpu_thread_main); pr_info("\n"); access_memory(vm, nr_vcpus, ACCESS_WRITE, "Populating memory"); @@ -321,11 +324,8 @@ static void run_test(enum vm_guest_mode mode, void *arg) mark_memory_idle(vm, nr_vcpus); access_memory(vm, nr_vcpus, ACCESS_READ, "Reading from idle memory"); - /* Set done to signal the vCPU threads to exit */ - done = true; - - perf_test_join_vcpu_threads(nr_vcpus); - perf_test_destroy_vm(vm); + memstress_join_vcpu_threads(nr_vcpus); + memstress_destroy_vm(vm); } static void help(char *name) @@ -368,7 +368,7 @@ int main(int argc, char *argv[]) params.vcpu_memory_bytes = parse_size(optarg); break; case 'v': - params.nr_vcpus = atoi(optarg); + params.nr_vcpus = atoi_positive("Number of vCPUs", optarg); break; case 'o': overlap_memory_access = true; diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c index 779ae54f89c4..b0e1fc4de9e2 100644 --- a/tools/testing/selftests/kvm/demand_paging_test.c +++ b/tools/testing/selftests/kvm/demand_paging_test.c @@ -20,29 +20,19 @@ #include "kvm_util.h" #include "test_util.h" -#include "perf_test_util.h" +#include "memstress.h" #include "guest_modes.h" +#include "userfaultfd_util.h" #ifdef __NR_userfaultfd -#ifdef PRINT_PER_PAGE_UPDATES -#define PER_PAGE_DEBUG(...) printf(__VA_ARGS__) -#else -#define PER_PAGE_DEBUG(...) _no_printf(__VA_ARGS__) -#endif - -#ifdef PRINT_PER_VCPU_UPDATES -#define PER_VCPU_DEBUG(...) printf(__VA_ARGS__) -#else -#define PER_VCPU_DEBUG(...) _no_printf(__VA_ARGS__) -#endif - static int nr_vcpus = 1; static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE; + static size_t demand_paging_size; static char *guest_data_prototype; -static void vcpu_worker(struct perf_test_vcpu_args *vcpu_args) +static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) { struct kvm_vcpu *vcpu = vcpu_args->vcpu; int vcpu_idx = vcpu_args->vcpu_idx; @@ -67,9 +57,11 @@ static void vcpu_worker(struct perf_test_vcpu_args *vcpu_args) ts_diff.tv_sec, ts_diff.tv_nsec); } -static int handle_uffd_page_request(int uffd_mode, int uffd, uint64_t addr) +static int handle_uffd_page_request(int uffd_mode, int uffd, + struct uffd_msg *msg) { pid_t tid = syscall(__NR_gettid); + uint64_t addr = msg->arg.pagefault.address; struct timespec start; struct timespec ts_diff; int r; @@ -116,176 +108,34 @@ static int handle_uffd_page_request(int uffd_mode, int uffd, uint64_t addr) return 0; } -bool quit_uffd_thread; - -struct uffd_handler_args { +struct test_params { int uffd_mode; - int uffd; - int pipefd; - useconds_t delay; + useconds_t uffd_delay; + enum vm_mem_backing_src_type src_type; + bool partition_vcpu_memory_access; }; -static void *uffd_handler_thread_fn(void *arg) -{ - struct uffd_handler_args *uffd_args = (struct uffd_handler_args *)arg; - int uffd = uffd_args->uffd; - int pipefd = uffd_args->pipefd; - useconds_t delay = uffd_args->delay; - int64_t pages = 0; - struct timespec start; - struct timespec ts_diff; - - clock_gettime(CLOCK_MONOTONIC, &start); - while (!quit_uffd_thread) { - struct uffd_msg msg; - struct pollfd pollfd[2]; - char tmp_chr; - int r; - uint64_t addr; - - pollfd[0].fd = uffd; - pollfd[0].events = POLLIN; - pollfd[1].fd = pipefd; - pollfd[1].events = POLLIN; - - r = poll(pollfd, 2, -1); - switch (r) { - case -1: - pr_info("poll err"); - continue; - case 0: - continue; - case 1: - break; - default: - pr_info("Polling uffd returned %d", r); - return NULL; - } - - if (pollfd[0].revents & POLLERR) { - pr_info("uffd revents has POLLERR"); - return NULL; - } - - if (pollfd[1].revents & POLLIN) { - r = read(pollfd[1].fd, &tmp_chr, 1); - TEST_ASSERT(r == 1, - "Error reading pipefd in UFFD thread\n"); - return NULL; - } - - if (!(pollfd[0].revents & POLLIN)) - continue; - - r = read(uffd, &msg, sizeof(msg)); - if (r == -1) { - if (errno == EAGAIN) - continue; - pr_info("Read of uffd got errno %d\n", errno); - return NULL; - } - - if (r != sizeof(msg)) { - pr_info("Read on uffd returned unexpected size: %d bytes", r); - return NULL; - } - - if (!(msg.event & UFFD_EVENT_PAGEFAULT)) - continue; - - if (delay) - usleep(delay); - addr = msg.arg.pagefault.address; - r = handle_uffd_page_request(uffd_args->uffd_mode, uffd, addr); - if (r < 0) - return NULL; - pages++; - } - - ts_diff = timespec_elapsed(start); - PER_VCPU_DEBUG("userfaulted %ld pages over %ld.%.9lds. (%f/sec)\n", - pages, ts_diff.tv_sec, ts_diff.tv_nsec, - pages / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0)); - - return NULL; -} - -static void setup_demand_paging(struct kvm_vm *vm, - pthread_t *uffd_handler_thread, int pipefd, - int uffd_mode, useconds_t uffd_delay, - struct uffd_handler_args *uffd_args, - void *hva, void *alias, uint64_t len) +static void prefault_mem(void *alias, uint64_t len) { - bool is_minor = (uffd_mode == UFFDIO_REGISTER_MODE_MINOR); - int uffd; - struct uffdio_api uffdio_api; - struct uffdio_register uffdio_register; - uint64_t expected_ioctls = ((uint64_t) 1) << _UFFDIO_COPY; - int ret; + size_t p; - PER_PAGE_DEBUG("Userfaultfd %s mode, faults resolved with %s\n", - is_minor ? "MINOR" : "MISSING", - is_minor ? "UFFDIO_CONINUE" : "UFFDIO_COPY"); - - /* In order to get minor faults, prefault via the alias. */ - if (is_minor) { - size_t p; - - expected_ioctls = ((uint64_t) 1) << _UFFDIO_CONTINUE; - - TEST_ASSERT(alias != NULL, "Alias required for minor faults"); - for (p = 0; p < (len / demand_paging_size); ++p) { - memcpy(alias + (p * demand_paging_size), - guest_data_prototype, demand_paging_size); - } + TEST_ASSERT(alias != NULL, "Alias required for minor faults"); + for (p = 0; p < (len / demand_paging_size); ++p) { + memcpy(alias + (p * demand_paging_size), + guest_data_prototype, demand_paging_size); } - - uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); - TEST_ASSERT(uffd >= 0, __KVM_SYSCALL_ERROR("userfaultfd()", uffd)); - - uffdio_api.api = UFFD_API; - uffdio_api.features = 0; - ret = ioctl(uffd, UFFDIO_API, &uffdio_api); - TEST_ASSERT(ret != -1, __KVM_SYSCALL_ERROR("UFFDIO_API", ret)); - - uffdio_register.range.start = (uint64_t)hva; - uffdio_register.range.len = len; - uffdio_register.mode = uffd_mode; - ret = ioctl(uffd, UFFDIO_REGISTER, &uffdio_register); - TEST_ASSERT(ret != -1, __KVM_SYSCALL_ERROR("UFFDIO_REGISTER", ret)); - TEST_ASSERT((uffdio_register.ioctls & expected_ioctls) == - expected_ioctls, "missing userfaultfd ioctls"); - - uffd_args->uffd_mode = uffd_mode; - uffd_args->uffd = uffd; - uffd_args->pipefd = pipefd; - uffd_args->delay = uffd_delay; - pthread_create(uffd_handler_thread, NULL, uffd_handler_thread_fn, - uffd_args); - - PER_VCPU_DEBUG("Created uffd thread for HVA range [%p, %p)\n", - hva, hva + len); } -struct test_params { - int uffd_mode; - useconds_t uffd_delay; - enum vm_mem_backing_src_type src_type; - bool partition_vcpu_memory_access; -}; - static void run_test(enum vm_guest_mode mode, void *arg) { struct test_params *p = arg; - pthread_t *uffd_handler_threads = NULL; - struct uffd_handler_args *uffd_args = NULL; + struct uffd_desc **uffd_descs = NULL; struct timespec start; struct timespec ts_diff; - int *pipefds = NULL; struct kvm_vm *vm; - int r, i; + int i; - vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size, 1, + vm = memstress_create_vm(mode, nr_vcpus, guest_percpu_mem_size, 1, p->src_type, p->partition_vcpu_memory_access); demand_paging_size = get_backing_src_pagesz(p->src_type); @@ -296,79 +146,61 @@ static void run_test(enum vm_guest_mode mode, void *arg) memset(guest_data_prototype, 0xAB, demand_paging_size); if (p->uffd_mode) { - uffd_handler_threads = - malloc(nr_vcpus * sizeof(*uffd_handler_threads)); - TEST_ASSERT(uffd_handler_threads, "Memory allocation failed"); - - uffd_args = malloc(nr_vcpus * sizeof(*uffd_args)); - TEST_ASSERT(uffd_args, "Memory allocation failed"); - - pipefds = malloc(sizeof(int) * nr_vcpus * 2); - TEST_ASSERT(pipefds, "Unable to allocate memory for pipefd"); + uffd_descs = malloc(nr_vcpus * sizeof(struct uffd_desc *)); + TEST_ASSERT(uffd_descs, "Memory allocation failed"); for (i = 0; i < nr_vcpus; i++) { - struct perf_test_vcpu_args *vcpu_args; + struct memstress_vcpu_args *vcpu_args; void *vcpu_hva; void *vcpu_alias; - vcpu_args = &perf_test_args.vcpu_args[i]; + vcpu_args = &memstress_args.vcpu_args[i]; /* Cache the host addresses of the region */ vcpu_hva = addr_gpa2hva(vm, vcpu_args->gpa); vcpu_alias = addr_gpa2alias(vm, vcpu_args->gpa); + prefault_mem(vcpu_alias, + vcpu_args->pages * memstress_args.guest_page_size); + /* * Set up user fault fd to handle demand paging * requests. */ - r = pipe2(&pipefds[i * 2], - O_CLOEXEC | O_NONBLOCK); - TEST_ASSERT(!r, "Failed to set up pipefd"); - - setup_demand_paging(vm, &uffd_handler_threads[i], - pipefds[i * 2], p->uffd_mode, - p->uffd_delay, &uffd_args[i], - vcpu_hva, vcpu_alias, - vcpu_args->pages * perf_test_args.guest_page_size); + uffd_descs[i] = uffd_setup_demand_paging( + p->uffd_mode, p->uffd_delay, vcpu_hva, + vcpu_args->pages * memstress_args.guest_page_size, + &handle_uffd_page_request); } } pr_info("Finished creating vCPUs and starting uffd threads\n"); clock_gettime(CLOCK_MONOTONIC, &start); - perf_test_start_vcpu_threads(nr_vcpus, vcpu_worker); + memstress_start_vcpu_threads(nr_vcpus, vcpu_worker); pr_info("Started all vCPUs\n"); - perf_test_join_vcpu_threads(nr_vcpus); + memstress_join_vcpu_threads(nr_vcpus); ts_diff = timespec_elapsed(start); pr_info("All vCPU threads joined\n"); if (p->uffd_mode) { - char c; - /* Tell the user fault fd handler threads to quit */ - for (i = 0; i < nr_vcpus; i++) { - r = write(pipefds[i * 2 + 1], &c, 1); - TEST_ASSERT(r == 1, "Unable to write to pipefd"); - - pthread_join(uffd_handler_threads[i], NULL); - } + for (i = 0; i < nr_vcpus; i++) + uffd_stop_demand_paging(uffd_descs[i]); } pr_info("Total guest execution time: %ld.%.9lds\n", ts_diff.tv_sec, ts_diff.tv_nsec); pr_info("Overall demand paging rate: %f pgs/sec\n", - perf_test_args.vcpu_args[0].pages * nr_vcpus / + memstress_args.vcpu_args[0].pages * nr_vcpus / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0)); - perf_test_destroy_vm(vm); + memstress_destroy_vm(vm); free(guest_data_prototype); - if (p->uffd_mode) { - free(uffd_handler_threads); - free(uffd_args); - free(pipefds); - } + if (p->uffd_mode) + free(uffd_descs); } static void help(char *name) @@ -427,8 +259,8 @@ int main(int argc, char *argv[]) p.src_type = parse_backing_src_type(optarg); break; case 'v': - nr_vcpus = atoi(optarg); - TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus, + nr_vcpus = atoi_positive("Number of vCPUs", optarg); + TEST_ASSERT(nr_vcpus <= max_vcpus, "Invalid number of vcpus, must be between 1 and %d", max_vcpus); break; case 'o': diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c index f99e39a672d3..e9d6d1aecf89 100644 --- a/tools/testing/selftests/kvm/dirty_log_perf_test.c +++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c @@ -16,7 +16,7 @@ #include "kvm_util.h" #include "test_util.h" -#include "perf_test_util.h" +#include "memstress.h" #include "guest_modes.h" #ifdef __aarch64__ @@ -67,7 +67,7 @@ static bool host_quit; static int iteration; static int vcpu_last_completed_iteration[KVM_MAX_VCPUS]; -static void vcpu_worker(struct perf_test_vcpu_args *vcpu_args) +static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) { struct kvm_vcpu *vcpu = vcpu_args->vcpu; int vcpu_idx = vcpu_args->vcpu_idx; @@ -128,10 +128,12 @@ static void vcpu_worker(struct perf_test_vcpu_args *vcpu_args) struct test_params { unsigned long iterations; uint64_t phys_offset; - int wr_fract; bool partition_vcpu_memory_access; enum vm_mem_backing_src_type backing_src; int slots; + uint32_t write_percent; + uint32_t random_seed; + bool random_access; }; static void toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable) @@ -139,7 +141,7 @@ static void toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable) int i; for (i = 0; i < slots; i++) { - int slot = PERF_TEST_MEM_SLOT_INDEX + i; + int slot = MEMSTRESS_MEM_SLOT_INDEX + i; int flags = enable ? KVM_MEM_LOG_DIRTY_PAGES : 0; vm_mem_region_set_flags(vm, slot, flags); @@ -161,7 +163,7 @@ static void get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots int i; for (i = 0; i < slots; i++) { - int slot = PERF_TEST_MEM_SLOT_INDEX + i; + int slot = MEMSTRESS_MEM_SLOT_INDEX + i; kvm_vm_get_dirty_log(vm, slot, bitmaps[i]); } @@ -173,7 +175,7 @@ static void clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int i; for (i = 0; i < slots; i++) { - int slot = PERF_TEST_MEM_SLOT_INDEX + i; + int slot = MEMSTRESS_MEM_SLOT_INDEX + i; kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], 0, pages_per_slot); } @@ -221,11 +223,13 @@ static void run_test(enum vm_guest_mode mode, void *arg) struct timespec clear_dirty_log_total = (struct timespec){0}; int i; - vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size, + vm = memstress_create_vm(mode, nr_vcpus, guest_percpu_mem_size, p->slots, p->backing_src, p->partition_vcpu_memory_access); - perf_test_set_wr_fract(vm, p->wr_fract); + pr_info("Random seed: %u\n", p->random_seed); + memstress_set_random_seed(vm, p->random_seed); + memstress_set_write_percent(vm, p->write_percent); guest_num_pages = (nr_vcpus * guest_percpu_mem_size) >> vm->page_shift; guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages); @@ -248,7 +252,16 @@ static void run_test(enum vm_guest_mode mode, void *arg) for (i = 0; i < nr_vcpus; i++) vcpu_last_completed_iteration[i] = -1; - perf_test_start_vcpu_threads(nr_vcpus, vcpu_worker); + /* + * Use 100% writes during the population phase to ensure all + * memory is actually populated and not just mapped to the zero + * page. The prevents expensive copy-on-write faults from + * occurring during the dirty memory iterations below, which + * would pollute the performance results. + */ + memstress_set_write_percent(vm, 100); + memstress_set_random_access(vm, false); + memstress_start_vcpu_threads(nr_vcpus, vcpu_worker); /* Allow the vCPUs to populate memory */ pr_debug("Starting iteration %d - Populating\n", iteration); @@ -269,6 +282,9 @@ static void run_test(enum vm_guest_mode mode, void *arg) pr_info("Enabling dirty logging time: %ld.%.9lds\n\n", ts_diff.tv_sec, ts_diff.tv_nsec); + memstress_set_write_percent(vm, p->write_percent); + memstress_set_random_access(vm, p->random_access); + while (iteration < p->iterations) { /* * Incrementing the iteration number will start the vCPUs @@ -329,7 +345,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) * wait for them to exit. */ host_quit = true; - perf_test_join_vcpu_threads(nr_vcpus); + memstress_join_vcpu_threads(nr_vcpus); avg = timespec_div(get_dirty_log_total, p->iterations); pr_info("Get dirty log over %lu iterations took %ld.%.9lds. (Avg %ld.%.9lds/iteration)\n", @@ -345,16 +361,17 @@ static void run_test(enum vm_guest_mode mode, void *arg) free_bitmaps(bitmaps, p->slots); arch_cleanup_vm(vm); - perf_test_destroy_vm(vm); + memstress_destroy_vm(vm); } static void help(char *name) { puts(""); - printf("usage: %s [-h] [-i iterations] [-p offset] [-g] " - "[-m mode] [-n] [-b vcpu bytes] [-v vcpus] [-o] [-s mem type]" - "[-x memslots]\n", name); + printf("usage: %s [-h] [-a] [-i iterations] [-p offset] [-g] " + "[-m mode] [-n] [-b vcpu bytes] [-v vcpus] [-o] [-r random seed ] [-s mem type]" + "[-x memslots] [-w percentage] [-c physical cpus to run test on]\n", name); puts(""); + printf(" -a: access memory randomly rather than in order.\n"); printf(" -i: specify iteration counts (default: %"PRIu64")\n", TEST_HOST_LOOP_N); printf(" -g: Do not enable KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2. This\n" @@ -373,16 +390,29 @@ static void help(char *name) printf(" -b: specify the size of the memory region which should be\n" " dirtied by each vCPU. e.g. 10M or 3G.\n" " (default: 1G)\n"); - printf(" -f: specify the fraction of pages which should be written to\n" - " as opposed to simply read, in the form\n" - " 1/<fraction of pages to write>.\n" - " (default: 1 i.e. all pages are written to.)\n"); printf(" -v: specify the number of vCPUs to run.\n"); printf(" -o: Overlap guest memory accesses instead of partitioning\n" " them into a separate region of memory for each vCPU.\n"); + printf(" -r: specify the starting random seed.\n"); backing_src_help("-s"); printf(" -x: Split the memory region into this number of memslots.\n" " (default: 1)\n"); + printf(" -w: specify the percentage of pages which should be written to\n" + " as an integer from 0-100 inclusive. This is probabilistic,\n" + " so -w X means each page has an X%% chance of writing\n" + " and a (100-X)%% chance of reading.\n" + " (default: 100 i.e. all pages are written to.)\n"); + printf(" -c: Pin tasks to physical CPUs. Takes a list of comma separated\n" + " values (target pCPU), one for each vCPU, plus an optional\n" + " entry for the main application task (specified via entry\n" + " <nr_vcpus + 1>). If used, entries must be provided for all\n" + " vCPUs, i.e. pinning vCPUs is all or nothing.\n\n" + " E.g. to create 3 vCPUs, pin vCPU0=>pCPU22, vCPU1=>pCPU23,\n" + " vCPU2=>pCPU24, and pin the application task to pCPU50:\n\n" + " ./dirty_log_perf_test -v 3 -c 22,23,24,50\n\n" + " To leave the application task unpinned, drop the final entry:\n\n" + " ./dirty_log_perf_test -v 3 -c 22,23,24\n\n" + " (default: no pinning)\n"); puts(""); exit(0); } @@ -390,12 +420,14 @@ static void help(char *name) int main(int argc, char *argv[]) { int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS); + const char *pcpu_list = NULL; struct test_params p = { .iterations = TEST_HOST_LOOP_N, - .wr_fract = 1, .partition_vcpu_memory_access = true, .backing_src = DEFAULT_VM_MEM_SRC, .slots = 1, + .random_seed = 1, + .write_percent = 100, }; int opt; @@ -406,55 +438,73 @@ int main(int argc, char *argv[]) guest_modes_append_default(); - while ((opt = getopt(argc, argv, "eghi:p:m:nb:f:v:os:x:")) != -1) { + while ((opt = getopt(argc, argv, "ab:c:eghi:m:nop:r:s:v:x:w:")) != -1) { switch (opt) { + case 'a': + p.random_access = true; + break; + case 'b': + guest_percpu_mem_size = parse_size(optarg); + break; + case 'c': + pcpu_list = optarg; + break; case 'e': /* 'e' is for evil. */ run_vcpus_while_disabling_dirty_logging = true; + break; case 'g': dirty_log_manual_caps = 0; break; - case 'i': - p.iterations = atoi(optarg); + case 'h': + help(argv[0]); break; - case 'p': - p.phys_offset = strtoull(optarg, NULL, 0); + case 'i': + p.iterations = atoi_positive("Number of iterations", optarg); break; case 'm': guest_modes_cmdline(optarg); break; case 'n': - perf_test_args.nested = true; - break; - case 'b': - guest_percpu_mem_size = parse_size(optarg); - break; - case 'f': - p.wr_fract = atoi(optarg); - TEST_ASSERT(p.wr_fract >= 1, - "Write fraction cannot be less than one"); - break; - case 'v': - nr_vcpus = atoi(optarg); - TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus, - "Invalid number of vcpus, must be between 1 and %d", max_vcpus); + memstress_args.nested = true; break; case 'o': p.partition_vcpu_memory_access = false; break; + case 'p': + p.phys_offset = strtoull(optarg, NULL, 0); + break; + case 'r': + p.random_seed = atoi_positive("Random seed", optarg); + break; case 's': p.backing_src = parse_backing_src_type(optarg); break; + case 'v': + nr_vcpus = atoi_positive("Number of vCPUs", optarg); + TEST_ASSERT(nr_vcpus <= max_vcpus, + "Invalid number of vcpus, must be between 1 and %d", max_vcpus); + break; + case 'w': + p.write_percent = atoi_non_negative("Write percentage", optarg); + TEST_ASSERT(p.write_percent <= 100, + "Write percentage must be between 0 and 100"); + break; case 'x': - p.slots = atoi(optarg); + p.slots = atoi_positive("Number of slots", optarg); break; - case 'h': default: help(argv[0]); break; } } + if (pcpu_list) { + kvm_parse_vcpu_pinning(pcpu_list, memstress_args.vcpu_to_pcpu, + nr_vcpus); + memstress_args.pin_vcpus = true; + } + TEST_ASSERT(p.iterations >= 2, "The test should have at least two iterations"); pr_info("Test iterations: %"PRIu64"\n", p.iterations); diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c index b5234d6efbe1..936f3a8d1b83 100644 --- a/tools/testing/selftests/kvm/dirty_log_test.c +++ b/tools/testing/selftests/kvm/dirty_log_test.c @@ -24,6 +24,9 @@ #include "guest_modes.h" #include "processor.h" +#define DIRTY_MEM_BITS 30 /* 1G */ +#define PAGE_SHIFT_4K 12 + /* The memory slot index to track dirty pages */ #define TEST_MEM_SLOT_INDEX 1 @@ -44,20 +47,20 @@ # define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7) # define test_bit_le(nr, addr) \ test_bit((nr) ^ BITOP_LE_SWIZZLE, addr) -# define set_bit_le(nr, addr) \ - set_bit((nr) ^ BITOP_LE_SWIZZLE, addr) -# define clear_bit_le(nr, addr) \ - clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr) -# define test_and_set_bit_le(nr, addr) \ - test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, addr) -# define test_and_clear_bit_le(nr, addr) \ - test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr) +# define __set_bit_le(nr, addr) \ + __set_bit((nr) ^ BITOP_LE_SWIZZLE, addr) +# define __clear_bit_le(nr, addr) \ + __clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr) +# define __test_and_set_bit_le(nr, addr) \ + __test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, addr) +# define __test_and_clear_bit_le(nr, addr) \ + __test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr) #else -# define test_bit_le test_bit -# define set_bit_le set_bit -# define clear_bit_le clear_bit -# define test_and_set_bit_le test_and_set_bit -# define test_and_clear_bit_le test_and_clear_bit +# define test_bit_le test_bit +# define __set_bit_le __set_bit +# define __clear_bit_le __clear_bit +# define __test_and_set_bit_le __test_and_set_bit +# define __test_and_clear_bit_le __test_and_clear_bit #endif #define TEST_DIRTY_RING_COUNT 65536 @@ -226,13 +229,15 @@ static void clear_log_create_vm_done(struct kvm_vm *vm) } static void dirty_log_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot, - void *bitmap, uint32_t num_pages) + void *bitmap, uint32_t num_pages, + uint32_t *unused) { kvm_vm_get_dirty_log(vcpu->vm, slot, bitmap); } static void clear_log_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot, - void *bitmap, uint32_t num_pages) + void *bitmap, uint32_t num_pages, + uint32_t *unused) { kvm_vm_get_dirty_log(vcpu->vm, slot, bitmap); kvm_vm_clear_dirty_log(vcpu->vm, slot, bitmap, 0, num_pages); @@ -271,6 +276,24 @@ static bool dirty_ring_supported(void) static void dirty_ring_create_vm_done(struct kvm_vm *vm) { + uint64_t pages; + uint32_t limit; + + /* + * We rely on vcpu exit due to full dirty ring state. Adjust + * the ring buffer size to ensure we're able to reach the + * full dirty ring state. + */ + pages = (1ul << (DIRTY_MEM_BITS - vm->page_shift)) + 3; + pages = vm_adjust_num_guest_pages(vm->mode, pages); + if (vm->page_size < getpagesize()) + pages = vm_num_host_pages(vm->mode, pages); + + limit = 1 << (31 - __builtin_clz(pages)); + test_dirty_ring_count = 1 << (31 - __builtin_clz(test_dirty_ring_count)); + test_dirty_ring_count = min(limit, test_dirty_ring_count); + pr_info("dirty ring count: 0x%x\n", test_dirty_ring_count); + /* * Switch to dirty ring mode after VM creation but before any * of the vcpu creation. @@ -305,7 +328,7 @@ static uint32_t dirty_ring_collect_one(struct kvm_dirty_gfn *dirty_gfns, TEST_ASSERT(cur->offset < num_pages, "Offset overflow: " "0x%llx >= 0x%x", cur->offset, num_pages); //pr_info("fetch 0x%x page %llu\n", *fetch_index, cur->offset); - set_bit_le(cur->offset, bitmap); + __set_bit_le(cur->offset, bitmap); dirty_ring_last_page = cur->offset; dirty_gfn_set_collected(cur); (*fetch_index)++; @@ -329,10 +352,9 @@ static void dirty_ring_continue_vcpu(void) } static void dirty_ring_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot, - void *bitmap, uint32_t num_pages) + void *bitmap, uint32_t num_pages, + uint32_t *ring_buf_idx) { - /* We only have one vcpu */ - static uint32_t fetch_index = 0; uint32_t count = 0, cleared; bool continued_vcpu = false; @@ -349,7 +371,8 @@ static void dirty_ring_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot, /* Only have one vcpu */ count = dirty_ring_collect_one(vcpu_map_dirty_ring(vcpu), - slot, bitmap, num_pages, &fetch_index); + slot, bitmap, num_pages, + ring_buf_idx); cleared = kvm_vm_reset_dirty_ring(vcpu->vm); @@ -406,7 +429,8 @@ struct log_mode { void (*create_vm_done)(struct kvm_vm *vm); /* Hook to collect the dirty pages into the bitmap provided */ void (*collect_dirty_pages) (struct kvm_vcpu *vcpu, int slot, - void *bitmap, uint32_t num_pages); + void *bitmap, uint32_t num_pages, + uint32_t *ring_buf_idx); /* Hook to call when after each vcpu run */ void (*after_vcpu_run)(struct kvm_vcpu *vcpu, int ret, int err); void (*before_vcpu_join) (void); @@ -471,13 +495,14 @@ static void log_mode_create_vm_done(struct kvm_vm *vm) } static void log_mode_collect_dirty_pages(struct kvm_vcpu *vcpu, int slot, - void *bitmap, uint32_t num_pages) + void *bitmap, uint32_t num_pages, + uint32_t *ring_buf_idx) { struct log_mode *mode = &log_modes[host_log_mode]; TEST_ASSERT(mode->collect_dirty_pages != NULL, "collect_dirty_pages() is required for any log mode!"); - mode->collect_dirty_pages(vcpu, slot, bitmap, num_pages); + mode->collect_dirty_pages(vcpu, slot, bitmap, num_pages, ring_buf_idx); } static void log_mode_after_vcpu_run(struct kvm_vcpu *vcpu, int ret, int err) @@ -560,7 +585,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) value_ptr = host_test_mem + page * host_page_size; /* If this is a special page that we were tracking... */ - if (test_and_clear_bit_le(page, host_bmap_track)) { + if (__test_and_clear_bit_le(page, host_bmap_track)) { host_track_next_count++; TEST_ASSERT(test_bit_le(page, bmap), "Page %"PRIu64" should have its dirty bit " @@ -568,7 +593,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) page); } - if (test_and_clear_bit_le(page, bmap)) { + if (__test_and_clear_bit_le(page, bmap)) { bool matched; host_dirty_count++; @@ -661,7 +686,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) * should report its dirtyness in the * next run */ - set_bit_le(page, host_bmap_track); + __set_bit_le(page, host_bmap_track); } } } @@ -681,9 +706,6 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, struct kvm_vcpu **vcpu, return vm; } -#define DIRTY_MEM_BITS 30 /* 1G */ -#define PAGE_SHIFT_4K 12 - struct test_params { unsigned long iterations; unsigned long interval; @@ -696,6 +718,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) struct kvm_vcpu *vcpu; struct kvm_vm *vm; unsigned long *bmap; + uint32_t ring_buf_idx = 0; if (!log_mode_supported()) { print_skip("Log mode '%s' not supported", @@ -756,8 +779,6 @@ static void run_test(enum vm_guest_mode mode, void *arg) /* Cache the HVA pointer of the region */ host_test_mem = addr_gpa2hva(vm, (vm_paddr_t)guest_test_phys_mem); - ucall_init(vm, NULL); - /* Export the shared variables to the guest */ sync_global_to_guest(vm, host_page_size); sync_global_to_guest(vm, guest_page_size); @@ -771,6 +792,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) host_dirty_count = 0; host_clear_count = 0; host_track_next_count = 0; + WRITE_ONCE(dirty_ring_vcpu_ring_full, false); pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu); @@ -778,7 +800,8 @@ static void run_test(enum vm_guest_mode mode, void *arg) /* Give the vcpu thread some time to dirty some pages */ usleep(p->interval * 1000); log_mode_collect_dirty_pages(vcpu, TEST_MEM_SLOT_INDEX, - bmap, host_num_pages); + bmap, host_num_pages, + &ring_buf_idx); /* * See vcpu_sync_stop_requested definition for details on why @@ -813,7 +836,6 @@ static void run_test(enum vm_guest_mode mode, void *arg) free(bmap); free(host_bmap_track); - ucall_uninit(vm); kvm_vm_free(vm); } @@ -823,7 +845,7 @@ static void help(char *name) printf("usage: %s [-h] [-i iterations] [-I interval] " "[-p offset] [-m mode]\n", name); puts(""); - printf(" -c: specify dirty ring size, in number of entries\n"); + printf(" -c: hint to dirty ring size, in number of entries\n"); printf(" (only useful for dirty-ring test; default: %"PRIu32")\n", TEST_DIRTY_RING_COUNT); printf(" -i: specify iteration counts (default: %"PRIu64")\n", diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h index a8124f9dd68a..5f977528e09c 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -38,12 +38,25 @@ * NORMAL 4 1111:1111 * NORMAL_WT 5 1011:1011 */ -#define DEFAULT_MAIR_EL1 ((0x00ul << (0 * 8)) | \ - (0x04ul << (1 * 8)) | \ - (0x0cul << (2 * 8)) | \ - (0x44ul << (3 * 8)) | \ - (0xfful << (4 * 8)) | \ - (0xbbul << (5 * 8))) + +/* Linux doesn't use these memory types, so let's define them. */ +#define MAIR_ATTR_DEVICE_GRE UL(0x0c) +#define MAIR_ATTR_NORMAL_WT UL(0xbb) + +#define MT_DEVICE_nGnRnE 0 +#define MT_DEVICE_nGnRE 1 +#define MT_DEVICE_GRE 2 +#define MT_NORMAL_NC 3 +#define MT_NORMAL 4 +#define MT_NORMAL_WT 5 + +#define DEFAULT_MAIR_EL1 \ + (MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRnE, MT_DEVICE_nGnRnE) | \ + MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRE, MT_DEVICE_nGnRE) | \ + MAIR_ATTRIDX(MAIR_ATTR_DEVICE_GRE, MT_DEVICE_GRE) | \ + MAIR_ATTRIDX(MAIR_ATTR_NORMAL_NC, MT_NORMAL_NC) | \ + MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL) | \ + MAIR_ATTRIDX(MAIR_ATTR_NORMAL_WT, MT_NORMAL_WT)) #define MPIDR_HWID_BITMASK (0xff00fffffful) @@ -92,11 +105,19 @@ enum { #define ESR_EC_MASK (ESR_EC_NUM - 1) #define ESR_EC_SVC64 0x15 +#define ESR_EC_IABT 0x21 +#define ESR_EC_DABT 0x25 #define ESR_EC_HW_BP_CURRENT 0x31 #define ESR_EC_SSTEP_CURRENT 0x33 #define ESR_EC_WP_CURRENT 0x35 #define ESR_EC_BRK_INS 0x3c +/* Access flag */ +#define PTE_AF (1ULL << 10) + +/* Access flag update enable/disable */ +#define TCR_EL1_HA (1ULL << 39) + void aarch64_get_supported_page_sizes(uint32_t ipa, bool *ps4k, bool *ps16k, bool *ps64k); @@ -109,6 +130,8 @@ void vm_install_exception_handler(struct kvm_vm *vm, void vm_install_sync_handler(struct kvm_vm *vm, int vector, int ec, handler_fn handler); +uint64_t *virt_get_pte_hva(struct kvm_vm *vm, vm_vaddr_t gva); + static inline void cpu_relax(void) { asm volatile("yield" ::: "memory"); diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index e42a09cd24a0..fbc2a79369b8 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -16,11 +16,24 @@ #include <linux/kvm.h> #include "linux/rbtree.h" +#include <asm/atomic.h> #include <sys/ioctl.h> #include "sparsebit.h" +/* + * Provide a version of static_assert() that is guaranteed to have an optional + * message param. If _ISOC11_SOURCE is defined, glibc (/usr/include/assert.h) + * #undefs and #defines static_assert() as a direct alias to _Static_assert(), + * i.e. effectively makes the message mandatory. Many KVM selftests #define + * _GNU_SOURCE for various reasons, and _GNU_SOURCE implies _ISOC11_SOURCE. As + * a result, static_assert() behavior is non-deterministic and may or may not + * require a message depending on #include order. + */ +#define __kvm_static_assert(expr, msg, ...) _Static_assert(expr, msg) +#define kvm_static_assert(expr, ...) __kvm_static_assert(expr, ##__VA_ARGS__, #expr) + #define KVM_DEV_PATH "/dev/kvm" #define KVM_MAX_VCPUS 512 @@ -34,6 +47,7 @@ struct userspace_mem_region { struct sparsebit *unused_phy_pages; int fd; off_t offset; + enum vm_mem_backing_src_type backing_src_type; void *host_mem; void *host_alias; void *mmap_start; @@ -64,6 +78,14 @@ struct userspace_mem_regions { DECLARE_HASHTABLE(slot_hash, 9); }; +enum kvm_mem_region_type { + MEM_REGION_CODE, + MEM_REGION_DATA, + MEM_REGION_PT, + MEM_REGION_TEST_DATA, + NR_MEM_REGIONS, +}; + struct kvm_vm { int mode; unsigned long type; @@ -81,6 +103,7 @@ struct kvm_vm { struct sparsebit *vpages_mapped; bool has_irqchip; bool pgd_created; + vm_paddr_t ucall_mmio_addr; vm_paddr_t pgd; vm_vaddr_t gdt; vm_vaddr_t tss; @@ -92,6 +115,13 @@ struct kvm_vm { int stats_fd; struct kvm_stats_header stats_header; struct kvm_stats_desc *stats_desc; + + /* + * KVM region slots. These are the default memslots used by page + * allocators, e.g., lib/elf uses the memslots[MEM_REGION_CODE] + * memslot. + */ + uint32_t memslots[NR_MEM_REGIONS]; }; @@ -104,6 +134,13 @@ struct kvm_vm { struct userspace_mem_region * memslot2region(struct kvm_vm *vm, uint32_t memslot); +static inline struct userspace_mem_region *vm_get_mem_region(struct kvm_vm *vm, + enum kvm_mem_region_type type) +{ + assert(type < NR_MEM_REGIONS); + return memslot2region(vm, vm->memslots[type]); +} + /* Minimum allocated guest virtual and physical addresses */ #define KVM_UTIL_MIN_VADDR 0x2000 #define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000 @@ -194,7 +231,7 @@ static inline bool kvm_has_cap(long cap) #define kvm_do_ioctl(fd, cmd, arg) \ ({ \ - static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) == _IOC_SIZE(cmd), ""); \ + kvm_static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) == _IOC_SIZE(cmd)); \ ioctl(fd, cmd, arg); \ }) @@ -383,8 +420,14 @@ void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags); void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa); void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot); struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id); +void vm_populate_vaddr_bitmap(struct kvm_vm *vm); +vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min); vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min); +vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type); vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages); +vm_vaddr_t __vm_vaddr_alloc_page(struct kvm_vm *vm, + enum kvm_mem_region_type type); vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm); void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, @@ -646,13 +689,13 @@ vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm); * __vm_create() does NOT create vCPUs, @nr_runnable_vcpus is used purely to * calculate the amount of memory needed for per-vCPU data, e.g. stacks. */ -struct kvm_vm *____vm_create(enum vm_guest_mode mode, uint64_t nr_pages); +struct kvm_vm *____vm_create(enum vm_guest_mode mode); struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint32_t nr_runnable_vcpus, uint64_t nr_extra_pages); static inline struct kvm_vm *vm_create_barebones(void) { - return ____vm_create(VM_MODE_DEFAULT, 0); + return ____vm_create(VM_MODE_DEFAULT); } static inline struct kvm_vm *vm_create(uint32_t nr_runnable_vcpus) @@ -688,6 +731,10 @@ static inline struct kvm_vm *vm_create_with_one_vcpu(struct kvm_vcpu **vcpu, struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm); +void kvm_pin_this_task_to_pcpu(uint32_t pcpu); +void kvm_parse_vcpu_pinning(const char *pcpus_string, uint32_t vcpu_to_pcpu[], + int nr_vcpus); + unsigned long vm_compute_max_gfn(struct kvm_vm *vm); unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size); unsigned int vm_num_host_pages(enum vm_guest_mode mode, unsigned int num_guest_pages); @@ -718,6 +765,19 @@ kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start, memcpy(&(g), _p, sizeof(g)); \ }) +/* + * Write a global value, but only in the VM's (guest's) domain. Primarily used + * for "globals" that hold per-VM values (VMs always duplicate code and global + * data into their own region of physical memory), but can be used anytime it's + * undesirable to change the host's copy of the global. + */ +#define write_guest_global(vm, g, val) ({ \ + typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g)); \ + typeof(g) _val = val; \ + \ + memcpy(_p, &(_val), sizeof(g)); \ +}) + void assert_on_unhandled_exception(struct kvm_vcpu *vcpu); void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, @@ -838,4 +898,13 @@ static inline int __vm_disable_nx_huge_pages(struct kvm_vm *vm) return __vm_enable_cap(vm, KVM_CAP_VM_DISABLE_NX_HUGE_PAGES, 0); } +/* + * Arch hook that is invoked via a constructor, i.e. before exeucting main(), + * to allow for arch-specific setup that is common to all tests, e.g. computing + * the default guest "mode". + */ +void kvm_selftest_arch_init(void); + +void kvm_arch_vm_post_create(struct kvm_vm *vm); + #endif /* SELFTEST_KVM_UTIL_BASE_H */ diff --git a/tools/testing/selftests/kvm/include/memstress.h b/tools/testing/selftests/kvm/include/memstress.h new file mode 100644 index 000000000000..72e3e358ef7b --- /dev/null +++ b/tools/testing/selftests/kvm/include/memstress.h @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * tools/testing/selftests/kvm/include/memstress.h + * + * Copyright (C) 2020, Google LLC. + */ + +#ifndef SELFTEST_KVM_MEMSTRESS_H +#define SELFTEST_KVM_MEMSTRESS_H + +#include <pthread.h> + +#include "kvm_util.h" + +/* Default guest test virtual memory offset */ +#define DEFAULT_GUEST_TEST_MEM 0xc0000000 + +#define DEFAULT_PER_VCPU_MEM_SIZE (1 << 30) /* 1G */ + +#define MEMSTRESS_MEM_SLOT_INDEX 1 + +struct memstress_vcpu_args { + uint64_t gpa; + uint64_t gva; + uint64_t pages; + + /* Only used by the host userspace part of the vCPU thread */ + struct kvm_vcpu *vcpu; + int vcpu_idx; +}; + +struct memstress_args { + struct kvm_vm *vm; + /* The starting address and size of the guest test region. */ + uint64_t gpa; + uint64_t size; + uint64_t guest_page_size; + uint32_t random_seed; + uint32_t write_percent; + + /* Run vCPUs in L2 instead of L1, if the architecture supports it. */ + bool nested; + /* Randomize which pages are accessed by the guest. */ + bool random_access; + /* True if all vCPUs are pinned to pCPUs */ + bool pin_vcpus; + /* The vCPU=>pCPU pinning map. Only valid if pin_vcpus is true. */ + uint32_t vcpu_to_pcpu[KVM_MAX_VCPUS]; + + /* Test is done, stop running vCPUs. */ + bool stop_vcpus; + + struct memstress_vcpu_args vcpu_args[KVM_MAX_VCPUS]; +}; + +extern struct memstress_args memstress_args; + +struct kvm_vm *memstress_create_vm(enum vm_guest_mode mode, int nr_vcpus, + uint64_t vcpu_memory_bytes, int slots, + enum vm_mem_backing_src_type backing_src, + bool partition_vcpu_memory_access); +void memstress_destroy_vm(struct kvm_vm *vm); + +void memstress_set_write_percent(struct kvm_vm *vm, uint32_t write_percent); +void memstress_set_random_seed(struct kvm_vm *vm, uint32_t random_seed); +void memstress_set_random_access(struct kvm_vm *vm, bool random_access); + +void memstress_start_vcpu_threads(int vcpus, void (*vcpu_fn)(struct memstress_vcpu_args *)); +void memstress_join_vcpu_threads(int vcpus); +void memstress_guest_code(uint32_t vcpu_id); + +uint64_t memstress_nested_pages(int nr_vcpus); +void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[]); + +#endif /* SELFTEST_KVM_MEMSTRESS_H */ diff --git a/tools/testing/selftests/kvm/include/perf_test_util.h b/tools/testing/selftests/kvm/include/perf_test_util.h deleted file mode 100644 index eaa88df0555a..000000000000 --- a/tools/testing/selftests/kvm/include/perf_test_util.h +++ /dev/null @@ -1,63 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * tools/testing/selftests/kvm/include/perf_test_util.h - * - * Copyright (C) 2020, Google LLC. - */ - -#ifndef SELFTEST_KVM_PERF_TEST_UTIL_H -#define SELFTEST_KVM_PERF_TEST_UTIL_H - -#include <pthread.h> - -#include "kvm_util.h" - -/* Default guest test virtual memory offset */ -#define DEFAULT_GUEST_TEST_MEM 0xc0000000 - -#define DEFAULT_PER_VCPU_MEM_SIZE (1 << 30) /* 1G */ - -#define PERF_TEST_MEM_SLOT_INDEX 1 - -struct perf_test_vcpu_args { - uint64_t gpa; - uint64_t gva; - uint64_t pages; - - /* Only used by the host userspace part of the vCPU thread */ - struct kvm_vcpu *vcpu; - int vcpu_idx; -}; - -struct perf_test_args { - struct kvm_vm *vm; - /* The starting address and size of the guest test region. */ - uint64_t gpa; - uint64_t size; - uint64_t guest_page_size; - int wr_fract; - - /* Run vCPUs in L2 instead of L1, if the architecture supports it. */ - bool nested; - - struct perf_test_vcpu_args vcpu_args[KVM_MAX_VCPUS]; -}; - -extern struct perf_test_args perf_test_args; - -struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, - uint64_t vcpu_memory_bytes, int slots, - enum vm_mem_backing_src_type backing_src, - bool partition_vcpu_memory_access); -void perf_test_destroy_vm(struct kvm_vm *vm); - -void perf_test_set_wr_fract(struct kvm_vm *vm, int wr_fract); - -void perf_test_start_vcpu_threads(int vcpus, void (*vcpu_fn)(struct perf_test_vcpu_args *)); -void perf_test_join_vcpu_threads(int vcpus); -void perf_test_guest_code(uint32_t vcpu_id); - -uint64_t perf_test_nested_pages(int nr_vcpus); -void perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[]); - -#endif /* SELFTEST_KVM_PERF_TEST_UTIL_H */ diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index befc754ce9b3..80d6416f3012 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -77,6 +77,13 @@ struct timespec timespec_sub(struct timespec ts1, struct timespec ts2); struct timespec timespec_elapsed(struct timespec start); struct timespec timespec_div(struct timespec ts, int divisor); +struct guest_random_state { + uint32_t seed; +}; + +struct guest_random_state new_guest_random_state(uint32_t seed); +uint32_t guest_random_u32(struct guest_random_state *state); + enum vm_mem_backing_src_type { VM_MEM_SRC_ANONYMOUS, VM_MEM_SRC_ANONYMOUS_THP, @@ -152,4 +159,22 @@ static inline void *align_ptr_up(void *x, size_t size) return (void *)align_up((unsigned long)x, size); } +int atoi_paranoid(const char *num_str); + +static inline uint32_t atoi_positive(const char *name, const char *num_str) +{ + int num = atoi_paranoid(num_str); + + TEST_ASSERT(num > 0, "%s must be greater than 0, got '%s'", name, num_str); + return num; +} + +static inline uint32_t atoi_non_negative(const char *name, const char *num_str) +{ + int num = atoi_paranoid(num_str); + + TEST_ASSERT(num >= 0, "%s must be non-negative, got '%s'", name, num_str); + return num; +} + #endif /* SELFTEST_KVM_TEST_UTIL_H */ diff --git a/tools/testing/selftests/kvm/include/ucall_common.h b/tools/testing/selftests/kvm/include/ucall_common.h index ee79d180e07e..1a6aaef5ccae 100644 --- a/tools/testing/selftests/kvm/include/ucall_common.h +++ b/tools/testing/selftests/kvm/include/ucall_common.h @@ -22,12 +22,26 @@ enum { struct ucall { uint64_t cmd; uint64_t args[UCALL_MAX_ARGS]; + + /* Host virtual address of this struct. */ + struct ucall *hva; }; -void ucall_init(struct kvm_vm *vm, void *arg); -void ucall_uninit(struct kvm_vm *vm); +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa); +void ucall_arch_do_ucall(vm_vaddr_t uc); +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu); + void ucall(uint64_t cmd, int nargs, ...); uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc); +void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa); + +/* + * Perform userspace call without any associated data. This bare call avoids + * allocating a ucall struct, which can be useful if the atomic operations in + * the full ucall() are problematic and/or unwanted. Note, this will come out + * as UCALL_NONE on the backend. + */ +#define GUEST_UCALL_NONE() ucall_arch_do_ucall((vm_vaddr_t)NULL) #define GUEST_SYNC_ARGS(stage, arg1, arg2, arg3, arg4) \ ucall(UCALL_SYNC, 6, "hello", stage, arg1, arg2, arg3, arg4) diff --git a/tools/testing/selftests/kvm/include/userfaultfd_util.h b/tools/testing/selftests/kvm/include/userfaultfd_util.h new file mode 100644 index 000000000000..877449c34592 --- /dev/null +++ b/tools/testing/selftests/kvm/include/userfaultfd_util.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * KVM userfaultfd util + * + * Copyright (C) 2018, Red Hat, Inc. + * Copyright (C) 2019-2022 Google LLC + */ + +#define _GNU_SOURCE /* for pipe2 */ + +#include <inttypes.h> +#include <time.h> +#include <pthread.h> +#include <linux/userfaultfd.h> + +#include "test_util.h" + +typedef int (*uffd_handler_t)(int uffd_mode, int uffd, struct uffd_msg *msg); + +struct uffd_desc { + int uffd_mode; + int uffd; + int pipefds[2]; + useconds_t delay; + uffd_handler_t handler; + pthread_t thread; +}; + +struct uffd_desc *uffd_setup_demand_paging(int uffd_mode, useconds_t delay, + void *hva, uint64_t len, + uffd_handler_t handler); + +void uffd_stop_demand_paging(struct uffd_desc *uffd); + +#ifdef PRINT_PER_PAGE_UPDATES +#define PER_PAGE_DEBUG(...) printf(__VA_ARGS__) +#else +#define PER_PAGE_DEBUG(...) _no_printf(__VA_ARGS__) +#endif + +#ifdef PRINT_PER_VCPU_UPDATES +#define PER_VCPU_DEBUG(...) printf(__VA_ARGS__) +#else +#define PER_VCPU_DEBUG(...) _no_printf(__VA_ARGS__) +#endif diff --git a/tools/testing/selftests/kvm/include/x86_64/evmcs.h b/tools/testing/selftests/kvm/include/x86_64/evmcs.h index 58db74f68af2..901caf0e0939 100644 --- a/tools/testing/selftests/kvm/include/x86_64/evmcs.h +++ b/tools/testing/selftests/kvm/include/x86_64/evmcs.h @@ -10,6 +10,7 @@ #define SELFTEST_KVM_EVMCS_H #include <stdint.h> +#include "hyperv.h" #include "vmx.h" #define u16 uint16_t @@ -20,15 +21,6 @@ extern bool enable_evmcs; -struct hv_vp_assist_page { - __u32 apic_assist; - __u32 reserved; - __u64 vtl_control[2]; - __u64 nested_enlightenments_control[2]; - __u32 enlighten_vmentry; - __u64 current_nested_vmcs; -}; - struct hv_enlightened_vmcs { u32 revision_id; u32 abort; @@ -41,6 +33,8 @@ struct hv_enlightened_vmcs { u16 host_gs_selector; u16 host_tr_selector; + u16 padding16_1; + u64 host_ia32_pat; u64 host_ia32_efer; @@ -159,7 +153,7 @@ struct hv_enlightened_vmcs { u64 ept_pointer; u16 virtual_processor_id; - u16 padding16[3]; + u16 padding16_2[3]; u64 padding64_2[5]; u64 guest_physical_address; @@ -195,13 +189,13 @@ struct hv_enlightened_vmcs { u64 guest_rip; u32 hv_clean_fields; - u32 hv_padding_32; + u32 padding32_1; u32 hv_synthetic_controls; struct { u32 nested_flush_hypercall:1; u32 msr_bitmap:1; u32 reserved:30; - } hv_enlightenments_control; + } __packed hv_enlightenments_control; u32 hv_vp_id; u32 padding32_2; u64 hv_vm_id; @@ -222,7 +216,7 @@ struct hv_enlightened_vmcs { u64 host_ssp; u64 host_ia32_int_ssp_table_addr; u64 padding64_6; -}; +} __packed; #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE 0 #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_IO_BITMAP BIT(0) @@ -243,29 +237,15 @@ struct hv_enlightened_vmcs { #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_ENLIGHTENMENTSCONTROL BIT(15) #define HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL 0xFFFF -#define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073 -#define HV_X64_MSR_VP_ASSIST_PAGE_ENABLE 0x00000001 -#define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT 12 -#define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK \ - (~((1ull << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) - 1)) +#define HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH 0x10000031 extern struct hv_enlightened_vmcs *current_evmcs; -extern struct hv_vp_assist_page *current_vp_assist; int vcpu_enable_evmcs(struct kvm_vcpu *vcpu); -static inline int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist) +static inline void evmcs_enable(void) { - u64 val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) | - HV_X64_MSR_VP_ASSIST_PAGE_ENABLE; - - wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val); - - current_vp_assist = vp_assist; - enable_evmcs = true; - - return 0; } static inline int evmcs_vmptrld(uint64_t vmcs_pa, void *vmcs) @@ -278,6 +258,16 @@ static inline int evmcs_vmptrld(uint64_t vmcs_pa, void *vmcs) return 0; } +static inline bool load_evmcs(struct hyperv_test_pages *hv) +{ + if (evmcs_vmptrld(hv->enlightened_vmcs_gpa, hv->enlightened_vmcs)) + return false; + + current_evmcs->revision_id = EVMCS_VERSION; + + return true; +} + static inline int evmcs_vmptrst(uint64_t *value) { *value = current_vp_assist->current_nested_vmcs & diff --git a/tools/testing/selftests/kvm/include/x86_64/hyperv.h b/tools/testing/selftests/kvm/include/x86_64/hyperv.h index b66910702c0a..9218bb5f44bf 100644 --- a/tools/testing/selftests/kvm/include/x86_64/hyperv.h +++ b/tools/testing/selftests/kvm/include/x86_64/hyperv.h @@ -9,6 +9,8 @@ #ifndef SELFTEST_KVM_HYPERV_H #define SELFTEST_KVM_HYPERV_H +#include "processor.h" + #define HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS 0x40000000 #define HYPERV_CPUID_INTERFACE 0x40000001 #define HYPERV_CPUID_VERSION 0x40000002 @@ -184,5 +186,106 @@ /* hypercall options */ #define HV_HYPERCALL_FAST_BIT BIT(16) +#define HV_HYPERCALL_VARHEAD_OFFSET 17 +#define HV_HYPERCALL_REP_COMP_OFFSET 32 + +/* + * Issue a Hyper-V hypercall. Returns exception vector raised or 0, 'hv_status' + * is set to the hypercall status (if no exception occurred). + */ +static inline uint8_t __hyperv_hypercall(u64 control, vm_vaddr_t input_address, + vm_vaddr_t output_address, + uint64_t *hv_status) +{ + uint64_t error_code; + uint8_t vector; + + /* Note both the hypercall and the "asm safe" clobber r9-r11. */ + asm volatile("mov %[output_address], %%r8\n\t" + KVM_ASM_SAFE("vmcall") + : "=a" (*hv_status), + "+c" (control), "+d" (input_address), + KVM_ASM_SAFE_OUTPUTS(vector, error_code) + : [output_address] "r"(output_address), + "a" (-EFAULT) + : "cc", "memory", "r8", KVM_ASM_SAFE_CLOBBERS); + return vector; +} + +/* Issue a Hyper-V hypercall and assert that it succeeded. */ +static inline void hyperv_hypercall(u64 control, vm_vaddr_t input_address, + vm_vaddr_t output_address) +{ + uint64_t hv_status; + uint8_t vector; + + vector = __hyperv_hypercall(control, input_address, output_address, &hv_status); + + GUEST_ASSERT(!vector); + GUEST_ASSERT((hv_status & 0xffff) == 0); +} + +/* Write 'Fast' hypercall input 'data' to the first 'n_sse_regs' SSE regs */ +static inline void hyperv_write_xmm_input(void *data, int n_sse_regs) +{ + int i; + + for (i = 0; i < n_sse_regs; i++) + write_sse_reg(i, (sse128_t *)(data + sizeof(sse128_t) * i)); +} + +/* Proper HV_X64_MSR_GUEST_OS_ID value */ +#define HYPERV_LINUX_OS_ID ((u64)0x8100 << 48) + +#define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073 +#define HV_X64_MSR_VP_ASSIST_PAGE_ENABLE 0x00000001 +#define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT 12 +#define HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK \ + (~((1ull << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) - 1)) + +struct hv_nested_enlightenments_control { + struct { + __u32 directhypercall:1; + __u32 reserved:31; + } features; + struct { + __u32 reserved; + } hypercallControls; +} __packed; + +/* Define virtual processor assist page structure. */ +struct hv_vp_assist_page { + __u32 apic_assist; + __u32 reserved1; + __u64 vtl_control[3]; + struct hv_nested_enlightenments_control nested_control; + __u8 enlighten_vmentry; + __u8 reserved2[7]; + __u64 current_nested_vmcs; +} __packed; + +extern struct hv_vp_assist_page *current_vp_assist; + +int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist); + +struct hyperv_test_pages { + /* VP assist page */ + void *vp_assist_hva; + uint64_t vp_assist_gpa; + void *vp_assist; + + /* Partition assist page */ + void *partition_assist_hva; + uint64_t partition_assist_gpa; + void *partition_assist; + + /* Enlightened VMCS */ + void *enlightened_vmcs_hva; + uint64_t enlightened_vmcs_gpa; + void *enlightened_vmcs; +}; + +struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm, + vm_vaddr_t *p_hv_pages_gva); #endif /* !SELFTEST_KVM_HYPERV_H */ diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index 5da0c5e2a7af..b1a31de7108a 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -63,16 +63,21 @@ struct kvm_x86_cpu_feature { u8 reg; u8 bit; }; -#define KVM_X86_CPU_FEATURE(fn, idx, gpr, __bit) \ -({ \ - struct kvm_x86_cpu_feature feature = { \ - .function = fn, \ - .index = idx, \ - .reg = KVM_CPUID_##gpr, \ - .bit = __bit, \ - }; \ - \ - feature; \ +#define KVM_X86_CPU_FEATURE(fn, idx, gpr, __bit) \ +({ \ + struct kvm_x86_cpu_feature feature = { \ + .function = fn, \ + .index = idx, \ + .reg = KVM_CPUID_##gpr, \ + .bit = __bit, \ + }; \ + \ + kvm_static_assert((fn & 0xc0000000) == 0 || \ + (fn & 0xc0000000) == 0x40000000 || \ + (fn & 0xc0000000) == 0x80000000 || \ + (fn & 0xc0000000) == 0xc0000000); \ + kvm_static_assert(idx < BIT(sizeof(feature.index) * BITS_PER_BYTE)); \ + feature; \ }) /* @@ -89,6 +94,8 @@ struct kvm_x86_cpu_feature { #define X86_FEATURE_XSAVE KVM_X86_CPU_FEATURE(0x1, 0, ECX, 26) #define X86_FEATURE_OSXSAVE KVM_X86_CPU_FEATURE(0x1, 0, ECX, 27) #define X86_FEATURE_RDRAND KVM_X86_CPU_FEATURE(0x1, 0, ECX, 30) +#define X86_FEATURE_HYPERVISOR KVM_X86_CPU_FEATURE(0x1, 0, ECX, 31) +#define X86_FEATURE_PAE KVM_X86_CPU_FEATURE(0x1, 0, EDX, 6) #define X86_FEATURE_MCE KVM_X86_CPU_FEATURE(0x1, 0, EDX, 7) #define X86_FEATURE_APIC KVM_X86_CPU_FEATURE(0x1, 0, EDX, 9) #define X86_FEATURE_CLFLUSH KVM_X86_CPU_FEATURE(0x1, 0, EDX, 19) @@ -96,6 +103,7 @@ struct kvm_x86_cpu_feature { #define X86_FEATURE_XMM2 KVM_X86_CPU_FEATURE(0x1, 0, EDX, 26) #define X86_FEATURE_FSGSBASE KVM_X86_CPU_FEATURE(0x7, 0, EBX, 0) #define X86_FEATURE_TSC_ADJUST KVM_X86_CPU_FEATURE(0x7, 0, EBX, 1) +#define X86_FEATURE_SGX KVM_X86_CPU_FEATURE(0x7, 0, EBX, 2) #define X86_FEATURE_HLE KVM_X86_CPU_FEATURE(0x7, 0, EBX, 4) #define X86_FEATURE_SMEP KVM_X86_CPU_FEATURE(0x7, 0, EBX, 7) #define X86_FEATURE_INVPCID KVM_X86_CPU_FEATURE(0x7, 0, EBX, 10) @@ -109,6 +117,7 @@ struct kvm_x86_cpu_feature { #define X86_FEATURE_PKU KVM_X86_CPU_FEATURE(0x7, 0, ECX, 3) #define X86_FEATURE_LA57 KVM_X86_CPU_FEATURE(0x7, 0, ECX, 16) #define X86_FEATURE_RDPID KVM_X86_CPU_FEATURE(0x7, 0, ECX, 22) +#define X86_FEATURE_SGX_LC KVM_X86_CPU_FEATURE(0x7, 0, ECX, 30) #define X86_FEATURE_SHSTK KVM_X86_CPU_FEATURE(0x7, 0, ECX, 7) #define X86_FEATURE_IBT KVM_X86_CPU_FEATURE(0x7, 0, EDX, 20) #define X86_FEATURE_AMX_TILE KVM_X86_CPU_FEATURE(0x7, 0, EDX, 24) @@ -162,6 +171,102 @@ struct kvm_x86_cpu_feature { #define X86_FEATURE_KVM_HC_MAP_GPA_RANGE KVM_X86_CPU_FEATURE(0x40000001, 0, EAX, 16) #define X86_FEATURE_KVM_MIGRATION_CONTROL KVM_X86_CPU_FEATURE(0x40000001, 0, EAX, 17) +/* + * Same idea as X86_FEATURE_XXX, but X86_PROPERTY_XXX retrieves a multi-bit + * value/property as opposed to a single-bit feature. Again, pack the info + * into a 64-bit value to pass by value with no overhead. + */ +struct kvm_x86_cpu_property { + u32 function; + u8 index; + u8 reg; + u8 lo_bit; + u8 hi_bit; +}; +#define KVM_X86_CPU_PROPERTY(fn, idx, gpr, low_bit, high_bit) \ +({ \ + struct kvm_x86_cpu_property property = { \ + .function = fn, \ + .index = idx, \ + .reg = KVM_CPUID_##gpr, \ + .lo_bit = low_bit, \ + .hi_bit = high_bit, \ + }; \ + \ + kvm_static_assert(low_bit < high_bit); \ + kvm_static_assert((fn & 0xc0000000) == 0 || \ + (fn & 0xc0000000) == 0x40000000 || \ + (fn & 0xc0000000) == 0x80000000 || \ + (fn & 0xc0000000) == 0xc0000000); \ + kvm_static_assert(idx < BIT(sizeof(property.index) * BITS_PER_BYTE)); \ + property; \ +}) + +#define X86_PROPERTY_MAX_BASIC_LEAF KVM_X86_CPU_PROPERTY(0, 0, EAX, 0, 31) +#define X86_PROPERTY_PMU_VERSION KVM_X86_CPU_PROPERTY(0xa, 0, EAX, 0, 7) +#define X86_PROPERTY_PMU_NR_GP_COUNTERS KVM_X86_CPU_PROPERTY(0xa, 0, EAX, 8, 15) +#define X86_PROPERTY_PMU_EBX_BIT_VECTOR_LENGTH KVM_X86_CPU_PROPERTY(0xa, 0, EAX, 24, 31) + +#define X86_PROPERTY_XSTATE_MAX_SIZE_XCR0 KVM_X86_CPU_PROPERTY(0xd, 0, EBX, 0, 31) +#define X86_PROPERTY_XSTATE_MAX_SIZE KVM_X86_CPU_PROPERTY(0xd, 0, ECX, 0, 31) +#define X86_PROPERTY_XSTATE_TILE_SIZE KVM_X86_CPU_PROPERTY(0xd, 18, EAX, 0, 31) +#define X86_PROPERTY_XSTATE_TILE_OFFSET KVM_X86_CPU_PROPERTY(0xd, 18, EBX, 0, 31) +#define X86_PROPERTY_AMX_TOTAL_TILE_BYTES KVM_X86_CPU_PROPERTY(0x1d, 1, EAX, 0, 15) +#define X86_PROPERTY_AMX_BYTES_PER_TILE KVM_X86_CPU_PROPERTY(0x1d, 1, EAX, 16, 31) +#define X86_PROPERTY_AMX_BYTES_PER_ROW KVM_X86_CPU_PROPERTY(0x1d, 1, EBX, 0, 15) +#define X86_PROPERTY_AMX_NR_TILE_REGS KVM_X86_CPU_PROPERTY(0x1d, 1, EBX, 16, 31) +#define X86_PROPERTY_AMX_MAX_ROWS KVM_X86_CPU_PROPERTY(0x1d, 1, ECX, 0, 15) + +#define X86_PROPERTY_MAX_KVM_LEAF KVM_X86_CPU_PROPERTY(0x40000000, 0, EAX, 0, 31) + +#define X86_PROPERTY_MAX_EXT_LEAF KVM_X86_CPU_PROPERTY(0x80000000, 0, EAX, 0, 31) +#define X86_PROPERTY_MAX_PHY_ADDR KVM_X86_CPU_PROPERTY(0x80000008, 0, EAX, 0, 7) +#define X86_PROPERTY_MAX_VIRT_ADDR KVM_X86_CPU_PROPERTY(0x80000008, 0, EAX, 8, 15) +#define X86_PROPERTY_PHYS_ADDR_REDUCTION KVM_X86_CPU_PROPERTY(0x8000001F, 0, EBX, 6, 11) + +#define X86_PROPERTY_MAX_CENTAUR_LEAF KVM_X86_CPU_PROPERTY(0xC0000000, 0, EAX, 0, 31) + +/* + * Intel's architectural PMU events are bizarre. They have a "feature" bit + * that indicates the feature is _not_ supported, and a property that states + * the length of the bit mask of unsupported features. A feature is supported + * if the size of the bit mask is larger than the "unavailable" bit, and said + * bit is not set. + * + * Wrap the "unavailable" feature to simplify checking whether or not a given + * architectural event is supported. + */ +struct kvm_x86_pmu_feature { + struct kvm_x86_cpu_feature anti_feature; +}; +#define KVM_X86_PMU_FEATURE(name, __bit) \ +({ \ + struct kvm_x86_pmu_feature feature = { \ + .anti_feature = KVM_X86_CPU_FEATURE(0xa, 0, EBX, __bit), \ + }; \ + \ + feature; \ +}) + +#define X86_PMU_FEATURE_BRANCH_INSNS_RETIRED KVM_X86_PMU_FEATURE(BRANCH_INSNS_RETIRED, 5) + +static inline unsigned int x86_family(unsigned int eax) +{ + unsigned int x86; + + x86 = (eax >> 8) & 0xf; + + if (x86 == 0xf) + x86 += (eax >> 20) & 0xff; + + return x86; +} + +static inline unsigned int x86_model(unsigned int eax) +{ + return ((eax >> 12) & 0xf0) | ((eax >> 4) & 0x0f); +} + /* Page table bitfield declarations */ #define PTE_PRESENT_MASK BIT_ULL(0) #define PTE_WRITABLE_MASK BIT_ULL(1) @@ -172,12 +277,18 @@ struct kvm_x86_cpu_feature { #define PTE_GLOBAL_MASK BIT_ULL(8) #define PTE_NX_MASK BIT_ULL(63) +#define PHYSICAL_PAGE_MASK GENMASK_ULL(51, 12) + #define PAGE_SHIFT 12 #define PAGE_SIZE (1ULL << PAGE_SHIFT) -#define PAGE_MASK (~(PAGE_SIZE-1)) +#define PAGE_MASK (~(PAGE_SIZE-1) & PHYSICAL_PAGE_MASK) -#define PHYSICAL_PAGE_MASK GENMASK_ULL(51, 12) -#define PTE_GET_PFN(pte) (((pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT) +#define HUGEPAGE_SHIFT(x) (PAGE_SHIFT + (((x) - 1) * 9)) +#define HUGEPAGE_SIZE(x) (1UL << HUGEPAGE_SHIFT(x)) +#define HUGEPAGE_MASK(x) (~(HUGEPAGE_SIZE(x) - 1) & PHYSICAL_PAGE_MASK) + +#define PTE_GET_PA(pte) ((pte) & PHYSICAL_PAGE_MASK) +#define PTE_GET_PFN(pte) (PTE_GET_PA(pte) >> PAGE_SHIFT) /* General Registers in 64-Bit Mode */ struct gpr64_regs { @@ -425,82 +536,143 @@ static inline void cpuid(uint32_t function, return __cpuid(function, 0, eax, ebx, ecx, edx); } -static inline bool this_cpu_has(struct kvm_x86_cpu_feature feature) +static inline uint32_t this_cpu_fms(void) +{ + uint32_t eax, ebx, ecx, edx; + + cpuid(1, &eax, &ebx, &ecx, &edx); + return eax; +} + +static inline uint32_t this_cpu_family(void) +{ + return x86_family(this_cpu_fms()); +} + +static inline uint32_t this_cpu_model(void) +{ + return x86_model(this_cpu_fms()); +} + +static inline uint32_t __this_cpu_has(uint32_t function, uint32_t index, + uint8_t reg, uint8_t lo, uint8_t hi) { uint32_t gprs[4]; - __cpuid(feature.function, feature.index, + __cpuid(function, index, &gprs[KVM_CPUID_EAX], &gprs[KVM_CPUID_EBX], &gprs[KVM_CPUID_ECX], &gprs[KVM_CPUID_EDX]); - return gprs[feature.reg] & BIT(feature.bit); + return (gprs[reg] & GENMASK(hi, lo)) >> lo; +} + +static inline bool this_cpu_has(struct kvm_x86_cpu_feature feature) +{ + return __this_cpu_has(feature.function, feature.index, + feature.reg, feature.bit, feature.bit); +} + +static inline uint32_t this_cpu_property(struct kvm_x86_cpu_property property) +{ + return __this_cpu_has(property.function, property.index, + property.reg, property.lo_bit, property.hi_bit); +} + +static __always_inline bool this_cpu_has_p(struct kvm_x86_cpu_property property) +{ + uint32_t max_leaf; + + switch (property.function & 0xc0000000) { + case 0: + max_leaf = this_cpu_property(X86_PROPERTY_MAX_BASIC_LEAF); + break; + case 0x40000000: + max_leaf = this_cpu_property(X86_PROPERTY_MAX_KVM_LEAF); + break; + case 0x80000000: + max_leaf = this_cpu_property(X86_PROPERTY_MAX_EXT_LEAF); + break; + case 0xc0000000: + max_leaf = this_cpu_property(X86_PROPERTY_MAX_CENTAUR_LEAF); + } + return max_leaf >= property.function; } -#define SET_XMM(__var, __xmm) \ - asm volatile("movq %0, %%"#__xmm : : "r"(__var) : #__xmm) +static inline bool this_pmu_has(struct kvm_x86_pmu_feature feature) +{ + uint32_t nr_bits = this_cpu_property(X86_PROPERTY_PMU_EBX_BIT_VECTOR_LENGTH); -static inline void set_xmm(int n, unsigned long val) + return nr_bits > feature.anti_feature.bit && + !this_cpu_has(feature.anti_feature); +} + +typedef u32 __attribute__((vector_size(16))) sse128_t; +#define __sse128_u union { sse128_t vec; u64 as_u64[2]; u32 as_u32[4]; } +#define sse128_lo(x) ({ __sse128_u t; t.vec = x; t.as_u64[0]; }) +#define sse128_hi(x) ({ __sse128_u t; t.vec = x; t.as_u64[1]; }) + +static inline void read_sse_reg(int reg, sse128_t *data) { - switch (n) { + switch (reg) { case 0: - SET_XMM(val, xmm0); + asm("movdqa %%xmm0, %0" : "=m"(*data)); break; case 1: - SET_XMM(val, xmm1); + asm("movdqa %%xmm1, %0" : "=m"(*data)); break; case 2: - SET_XMM(val, xmm2); + asm("movdqa %%xmm2, %0" : "=m"(*data)); break; case 3: - SET_XMM(val, xmm3); + asm("movdqa %%xmm3, %0" : "=m"(*data)); break; case 4: - SET_XMM(val, xmm4); + asm("movdqa %%xmm4, %0" : "=m"(*data)); break; case 5: - SET_XMM(val, xmm5); + asm("movdqa %%xmm5, %0" : "=m"(*data)); break; case 6: - SET_XMM(val, xmm6); + asm("movdqa %%xmm6, %0" : "=m"(*data)); break; case 7: - SET_XMM(val, xmm7); + asm("movdqa %%xmm7, %0" : "=m"(*data)); break; + default: + BUG(); } } -#define GET_XMM(__xmm) \ -({ \ - unsigned long __val; \ - asm volatile("movq %%"#__xmm", %0" : "=r"(__val)); \ - __val; \ -}) - -static inline unsigned long get_xmm(int n) +static inline void write_sse_reg(int reg, const sse128_t *data) { - assert(n >= 0 && n <= 7); - - switch (n) { + switch (reg) { case 0: - return GET_XMM(xmm0); + asm("movdqa %0, %%xmm0" : : "m"(*data)); + break; case 1: - return GET_XMM(xmm1); + asm("movdqa %0, %%xmm1" : : "m"(*data)); + break; case 2: - return GET_XMM(xmm2); + asm("movdqa %0, %%xmm2" : : "m"(*data)); + break; case 3: - return GET_XMM(xmm3); + asm("movdqa %0, %%xmm3" : : "m"(*data)); + break; case 4: - return GET_XMM(xmm4); + asm("movdqa %0, %%xmm4" : : "m"(*data)); + break; case 5: - return GET_XMM(xmm5); + asm("movdqa %0, %%xmm5" : : "m"(*data)); + break; case 6: - return GET_XMM(xmm6); + asm("movdqa %0, %%xmm6" : : "m"(*data)); + break; case 7: - return GET_XMM(xmm7); + asm("movdqa %0, %%xmm7" : : "m"(*data)); + break; + default: + BUG(); } - - /* never reached */ - return 0; } static inline void cpu_relax(void) @@ -508,11 +680,6 @@ static inline void cpu_relax(void) asm volatile("rep; nop" ::: "memory"); } -#define vmmcall() \ - __asm__ __volatile__( \ - "vmmcall\n" \ - ) - #define ud2() \ __asm__ __volatile__( \ "ud2\n" \ @@ -526,23 +693,6 @@ static inline void cpu_relax(void) bool is_intel_cpu(void); bool is_amd_cpu(void); -static inline unsigned int x86_family(unsigned int eax) -{ - unsigned int x86; - - x86 = (eax >> 8) & 0xf; - - if (x86 == 0xf) - x86 += (eax >> 20) & 0xff; - - return x86; -} - -static inline unsigned int x86_model(unsigned int eax) -{ - return ((eax >> 12) & 0xf0) | ((eax >> 4) & 0x0f); -} - struct kvm_x86_state *vcpu_save_state(struct kvm_vcpu *vcpu); void vcpu_load_state(struct kvm_vcpu *vcpu, struct kvm_x86_state *state); void kvm_x86_state_cleanup(struct kvm_x86_state *state); @@ -604,10 +754,27 @@ static inline void vcpu_xcrs_set(struct kvm_vcpu *vcpu, struct kvm_xcrs *xcrs) vcpu_ioctl(vcpu, KVM_SET_XCRS, xcrs); } +const struct kvm_cpuid_entry2 *get_cpuid_entry(const struct kvm_cpuid2 *cpuid, + uint32_t function, uint32_t index); const struct kvm_cpuid2 *kvm_get_supported_cpuid(void); const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void); const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu); +static inline uint32_t kvm_cpu_fms(void) +{ + return get_cpuid_entry(kvm_get_supported_cpuid(), 0x1, 0)->eax; +} + +static inline uint32_t kvm_cpu_family(void) +{ + return x86_family(kvm_cpu_fms()); +} + +static inline uint32_t kvm_cpu_model(void) +{ + return x86_model(kvm_cpu_fms()); +} + bool kvm_cpuid_has(const struct kvm_cpuid2 *cpuid, struct kvm_x86_cpu_feature feature); @@ -616,6 +783,42 @@ static inline bool kvm_cpu_has(struct kvm_x86_cpu_feature feature) return kvm_cpuid_has(kvm_get_supported_cpuid(), feature); } +uint32_t kvm_cpuid_property(const struct kvm_cpuid2 *cpuid, + struct kvm_x86_cpu_property property); + +static inline uint32_t kvm_cpu_property(struct kvm_x86_cpu_property property) +{ + return kvm_cpuid_property(kvm_get_supported_cpuid(), property); +} + +static __always_inline bool kvm_cpu_has_p(struct kvm_x86_cpu_property property) +{ + uint32_t max_leaf; + + switch (property.function & 0xc0000000) { + case 0: + max_leaf = kvm_cpu_property(X86_PROPERTY_MAX_BASIC_LEAF); + break; + case 0x40000000: + max_leaf = kvm_cpu_property(X86_PROPERTY_MAX_KVM_LEAF); + break; + case 0x80000000: + max_leaf = kvm_cpu_property(X86_PROPERTY_MAX_EXT_LEAF); + break; + case 0xc0000000: + max_leaf = kvm_cpu_property(X86_PROPERTY_MAX_CENTAUR_LEAF); + } + return max_leaf >= property.function; +} + +static inline bool kvm_pmu_has(struct kvm_x86_pmu_feature feature) +{ + uint32_t nr_bits = kvm_cpu_property(X86_PROPERTY_PMU_EBX_BIT_VECTOR_LENGTH); + + return nr_bits > feature.anti_feature.bit && + !kvm_cpu_has(feature.anti_feature); +} + static inline size_t kvm_cpuid2_size(int nr_entries) { return sizeof(struct kvm_cpuid2) + @@ -639,8 +842,6 @@ static inline struct kvm_cpuid2 *allocate_kvm_cpuid2(int nr_entries) return cpuid; } -const struct kvm_cpuid_entry2 *get_cpuid_entry(const struct kvm_cpuid2 *cpuid, - uint32_t function, uint32_t index); void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid); void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu); @@ -701,17 +902,6 @@ static inline void vcpu_clear_cpuid_feature(struct kvm_vcpu *vcpu, vcpu_set_or_clear_cpuid_feature(vcpu, feature, false); } -static inline const struct kvm_cpuid_entry2 *__kvm_get_supported_cpuid_entry(uint32_t function, - uint32_t index) -{ - return get_cpuid_entry(kvm_get_supported_cpuid(), function, index); -} - -static inline const struct kvm_cpuid_entry2 *kvm_get_supported_cpuid_entry(uint32_t function) -{ - return __kvm_get_supported_cpuid_entry(function, 0); -} - uint64_t vcpu_get_msr(struct kvm_vcpu *vcpu, uint64_t msr_index); int _vcpu_set_msr(struct kvm_vcpu *vcpu, uint64_t msr_index, uint64_t msr_value); @@ -723,15 +913,6 @@ static inline void vcpu_set_msr(struct kvm_vcpu *vcpu, uint64_t msr_index, TEST_ASSERT(r == 1, KVM_IOCTL_ERROR(KVM_SET_MSRS, r)); } -static inline uint32_t kvm_get_cpuid_max_basic(void) -{ - return kvm_get_supported_cpuid_entry(0)->eax; -} - -static inline uint32_t kvm_get_cpuid_max_extended(void) -{ - return kvm_get_supported_cpuid_entry(0x80000000)->eax; -} void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits); bool vm_is_unrestricted_guest(struct kvm_vm *vm); @@ -777,7 +958,7 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector, * for recursive faults when accessing memory in the handler. The downside to * using registers is that it restricts what registers can be used by the actual * instruction. But, selftests are 64-bit only, making register* pressure a - * minor concern. Use r9-r11 as they are volatile, i.e. don't need* to be saved + * minor concern. Use r9-r11 as they are volatile, i.e. don't need to be saved * by the callee, and except for r11 are not implicit parameters to any * instructions. Ideally, fixup would use r8-r10 and thus avoid implicit * parameters entirely, but Hyper-V's hypercall ABI uses r8 and testing Hyper-V @@ -793,39 +974,52 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector, * * REGISTER OUTPUTS: * r9 = exception vector (non-zero) + * r10 = error code */ #define KVM_ASM_SAFE(insn) \ "mov $" __stringify(KVM_EXCEPTION_MAGIC) ", %%r9\n\t" \ "lea 1f(%%rip), %%r10\n\t" \ "lea 2f(%%rip), %%r11\n\t" \ "1: " insn "\n\t" \ - "movb $0, %[vector]\n\t" \ - "jmp 3f\n\t" \ + "xor %%r9, %%r9\n\t" \ "2:\n\t" \ "mov %%r9b, %[vector]\n\t" \ - "3:\n\t" + "mov %%r10, %[error_code]\n\t" -#define KVM_ASM_SAFE_OUTPUTS(v) [vector] "=qm"(v) +#define KVM_ASM_SAFE_OUTPUTS(v, ec) [vector] "=qm"(v), [error_code] "=rm"(ec) #define KVM_ASM_SAFE_CLOBBERS "r9", "r10", "r11" -#define kvm_asm_safe(insn, inputs...) \ -({ \ - uint8_t vector; \ - \ - asm volatile(KVM_ASM_SAFE(insn) \ - : KVM_ASM_SAFE_OUTPUTS(vector) \ - : inputs \ - : KVM_ASM_SAFE_CLOBBERS); \ - vector; \ +#define kvm_asm_safe(insn, inputs...) \ +({ \ + uint64_t ign_error_code; \ + uint8_t vector; \ + \ + asm volatile(KVM_ASM_SAFE(insn) \ + : KVM_ASM_SAFE_OUTPUTS(vector, ign_error_code) \ + : inputs \ + : KVM_ASM_SAFE_CLOBBERS); \ + vector; \ +}) + +#define kvm_asm_safe_ec(insn, error_code, inputs...) \ +({ \ + uint8_t vector; \ + \ + asm volatile(KVM_ASM_SAFE(insn) \ + : KVM_ASM_SAFE_OUTPUTS(vector, error_code) \ + : inputs \ + : KVM_ASM_SAFE_CLOBBERS); \ + vector; \ }) static inline uint8_t rdmsr_safe(uint32_t msr, uint64_t *val) { + uint64_t error_code; uint8_t vector; uint32_t a, d; asm volatile(KVM_ASM_SAFE("rdmsr") - : "=a"(a), "=d"(d), KVM_ASM_SAFE_OUTPUTS(vector) + : "=a"(a), "=d"(d), KVM_ASM_SAFE_OUTPUTS(vector, error_code) : "c"(msr) : KVM_ASM_SAFE_CLOBBERS); @@ -840,10 +1034,9 @@ static inline uint8_t wrmsr_safe(uint32_t msr, uint64_t val) bool kvm_is_tdp_enabled(void); -uint64_t vm_get_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu, - uint64_t vaddr); -void vm_set_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu, - uint64_t vaddr, uint64_t pte); +uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, + int *level); +uint64_t *vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr); uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2, uint64_t a3); @@ -895,4 +1088,27 @@ void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, #define XSTATE_XTILE_DATA_MASK (1ULL << XSTATE_XTILE_DATA_BIT) #define XFEATURE_XTILE_MASK (XSTATE_XTILE_CFG_MASK | \ XSTATE_XTILE_DATA_MASK) + +#define PFERR_PRESENT_BIT 0 +#define PFERR_WRITE_BIT 1 +#define PFERR_USER_BIT 2 +#define PFERR_RSVD_BIT 3 +#define PFERR_FETCH_BIT 4 +#define PFERR_PK_BIT 5 +#define PFERR_SGX_BIT 15 +#define PFERR_GUEST_FINAL_BIT 32 +#define PFERR_GUEST_PAGE_BIT 33 +#define PFERR_IMPLICIT_ACCESS_BIT 48 + +#define PFERR_PRESENT_MASK BIT(PFERR_PRESENT_BIT) +#define PFERR_WRITE_MASK BIT(PFERR_WRITE_BIT) +#define PFERR_USER_MASK BIT(PFERR_USER_BIT) +#define PFERR_RSVD_MASK BIT(PFERR_RSVD_BIT) +#define PFERR_FETCH_MASK BIT(PFERR_FETCH_BIT) +#define PFERR_PK_MASK BIT(PFERR_PK_BIT) +#define PFERR_SGX_MASK BIT(PFERR_SGX_BIT) +#define PFERR_GUEST_FINAL_MASK BIT_ULL(PFERR_GUEST_FINAL_BIT) +#define PFERR_GUEST_PAGE_MASK BIT_ULL(PFERR_GUEST_PAGE_BIT) +#define PFERR_IMPLICIT_ACCESS BIT_ULL(PFERR_IMPLICIT_ACCESS_BIT) + #endif /* SELFTEST_KVM_PROCESSOR_H */ diff --git a/tools/testing/selftests/kvm/include/x86_64/svm.h b/tools/testing/selftests/kvm/include/x86_64/svm.h index c8343ff84f7f..4803e1056055 100644 --- a/tools/testing/selftests/kvm/include/x86_64/svm.h +++ b/tools/testing/selftests/kvm/include/x86_64/svm.h @@ -58,6 +58,27 @@ enum { INTERCEPT_RDPRU, }; +struct hv_vmcb_enlightenments { + struct __packed hv_enlightenments_control { + u32 nested_flush_hypercall:1; + u32 msr_bitmap:1; + u32 enlightened_npt_tlb: 1; + u32 reserved:29; + } __packed hv_enlightenments_control; + u32 hv_vp_id; + u64 hv_vm_id; + u64 partition_assist_page; + u64 reserved; +} __packed; + +/* + * Hyper-V uses the software reserved clean bit in VMCB + */ +#define HV_VMCB_NESTED_ENLIGHTENMENTS (1U << 31) + +/* Synthetic VM-Exit */ +#define HV_SVM_EXITCODE_ENL 0xf0000000 +#define HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH (1) struct __attribute__ ((__packed__)) vmcb_control_area { u32 intercept_cr; @@ -106,7 +127,10 @@ struct __attribute__ ((__packed__)) vmcb_control_area { * Offset 0x3e0, 32 bytes reserved * for use by hypervisor/software. */ - u8 reserved_sw[32]; + union { + struct hv_vmcb_enlightenments hv_enlightenments; + u8 reserved_sw[32]; + }; }; diff --git a/tools/testing/selftests/kvm/include/x86_64/svm_util.h b/tools/testing/selftests/kvm/include/x86_64/svm_util.h index 7aee6244ab6a..044f0f872ba9 100644 --- a/tools/testing/selftests/kvm/include/x86_64/svm_util.h +++ b/tools/testing/selftests/kvm/include/x86_64/svm_util.h @@ -32,6 +32,20 @@ struct svm_test_data { uint64_t msr_gpa; }; +static inline void vmmcall(void) +{ + /* + * Stuff RAX and RCX with "safe" values to make sure L0 doesn't handle + * it as a valid hypercall (e.g. Hyper-V L2 TLB flush) as the intended + * use of this function is to exit to L1 from L2. Clobber all other + * GPRs as L1 doesn't correctly preserve them during vmexits. + */ + __asm__ __volatile__("push %%rbp; vmmcall; pop %%rbp" + : : "a"(0xdeadbeef), "c"(0xbeefdead) + : "rbx", "rdx", "rsi", "rdi", "r8", "r9", + "r10", "r11", "r12", "r13", "r14", "r15"); +} + #define stgi() \ __asm__ __volatile__( \ "stgi\n" \ diff --git a/tools/testing/selftests/kvm/include/x86_64/vmx.h b/tools/testing/selftests/kvm/include/x86_64/vmx.h index 71b290b6469d..5f0c0a29c556 100644 --- a/tools/testing/selftests/kvm/include/x86_64/vmx.h +++ b/tools/testing/selftests/kvm/include/x86_64/vmx.h @@ -437,11 +437,16 @@ static inline int vmresume(void) static inline void vmcall(void) { - /* Currently, L1 destroys our GPRs during vmexits. */ - __asm__ __volatile__("push %%rbp; vmcall; pop %%rbp" : : : - "rax", "rbx", "rcx", "rdx", - "rsi", "rdi", "r8", "r9", "r10", "r11", "r12", - "r13", "r14", "r15"); + /* + * Stuff RAX and RCX with "safe" values to make sure L0 doesn't handle + * it as a valid hypercall (e.g. Hyper-V L2 TLB flush) as the intended + * use of this function is to exit to L1 from L2. Clobber all other + * GPRs as L1 doesn't correctly preserve them during vmexits. + */ + __asm__ __volatile__("push %%rbp; vmcall; pop %%rbp" + : : "a"(0xdeadbeef), "c"(0xbeefdead) + : "rbx", "rdx", "rsi", "rdi", "r8", "r9", + "r10", "r11", "r12", "r13", "r14", "r15"); } static inline int vmread(uint64_t encoding, uint64_t *value) @@ -517,14 +522,6 @@ struct vmx_pages { uint64_t vmwrite_gpa; void *vmwrite; - void *vp_assist_hva; - uint64_t vp_assist_gpa; - void *vp_assist; - - void *enlightened_vmcs_hva; - uint64_t enlightened_vmcs_gpa; - void *enlightened_vmcs; - void *eptp_hva; uint64_t eptp_gpa; void *eptp; @@ -572,7 +569,7 @@ void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm, uint32_t memslot); void nested_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm, uint64_t addr, uint64_t size); -bool kvm_vm_has_ept(struct kvm_vm *vm); +bool kvm_cpu_has_ept(void); void prepare_eptp(struct vmx_pages *vmx, struct kvm_vm *vm, uint32_t eptp_memslot); void prepare_virtualize_apic_accesses(struct vmx_pages *vmx, struct kvm_vm *vm); diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c index f42c6ac6d71d..b3b00be1ef82 100644 --- a/tools/testing/selftests/kvm/kvm_page_table_test.c +++ b/tools/testing/selftests/kvm/kvm_page_table_test.c @@ -289,7 +289,6 @@ static struct kvm_vm *pre_init_before_test(enum vm_guest_mode mode, void *arg) host_test_mem = addr_gpa2hva(vm, (vm_paddr_t)guest_test_phys_mem); /* Export shared structure test_args to guest */ - ucall_init(vm, NULL); sync_global_to_guest(vm, test_args); ret = sem_init(&test_stage_updated, 0, 0); @@ -417,7 +416,6 @@ static void run_test(enum vm_guest_mode mode, void *arg) TEST_ASSERT(ret == 0, "Error in sem_destroy"); free(vcpu_threads); - ucall_uninit(vm); kvm_vm_free(vm); } @@ -461,8 +459,8 @@ int main(int argc, char *argv[]) p.test_mem_size = parse_size(optarg); break; case 'v': - nr_vcpus = atoi(optarg); - TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus, + nr_vcpus = atoi_positive("Number of vCPUs", optarg); + TEST_ASSERT(nr_vcpus <= max_vcpus, "Invalid number of vcpus, must be between 1 and %d", max_vcpus); break; case 's': diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c index 6f5551368944..5972a23b2765 100644 --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c @@ -11,6 +11,7 @@ #include "guest_modes.h" #include "kvm_util.h" #include "processor.h" +#include <linux/bitfield.h> #define DEFAULT_ARM64_GUEST_STACK_VADDR_MIN 0xac0000 @@ -76,13 +77,15 @@ static uint64_t __maybe_unused ptrs_per_pte(struct kvm_vm *vm) void virt_arch_pgd_alloc(struct kvm_vm *vm) { - if (!vm->pgd_created) { - vm_paddr_t paddr = vm_phy_pages_alloc(vm, - page_align(vm, ptrs_per_pgd(vm) * 8) / vm->page_size, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0); - vm->pgd = paddr; - vm->pgd_created = true; - } + size_t nr_pages = page_align(vm, ptrs_per_pgd(vm) * 8) / vm->page_size; + + if (vm->pgd_created) + return; + + vm->pgd = vm_phy_pages_alloc(vm, nr_pages, + KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); + vm->pgd_created = true; } static void _virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, @@ -133,12 +136,12 @@ static void _virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr) { - uint64_t attr_idx = 4; /* NORMAL (See DEFAULT_MAIR_EL1) */ + uint64_t attr_idx = MT_NORMAL; _virt_pg_map(vm, vaddr, paddr, attr_idx); } -vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) +uint64_t *virt_get_pte_hva(struct kvm_vm *vm, vm_vaddr_t gva) { uint64_t *ptep; @@ -169,11 +172,18 @@ vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) TEST_FAIL("Page table levels must be 2, 3, or 4"); } - return pte_addr(vm, *ptep) + (gva & (vm->page_size - 1)); + return ptep; unmapped_gva: TEST_FAIL("No mapping for vm virtual address, gva: 0x%lx", gva); - exit(1); + exit(EXIT_FAILURE); +} + +vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) +{ + uint64_t *ptep = virt_get_pte_hva(vm, gva); + + return pte_addr(vm, *ptep) + (gva & (vm->page_size - 1)); } static void pte_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent, uint64_t page, int level) @@ -318,13 +328,16 @@ void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent) struct kvm_vcpu *aarch64_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, struct kvm_vcpu_init *init, void *guest_code) { - size_t stack_size = vm->page_size == 4096 ? - DEFAULT_STACK_PGS * vm->page_size : - vm->page_size; - uint64_t stack_vaddr = vm_vaddr_alloc(vm, stack_size, - DEFAULT_ARM64_GUEST_STACK_VADDR_MIN); + size_t stack_size; + uint64_t stack_vaddr; struct kvm_vcpu *vcpu = __vm_vcpu_add(vm, vcpu_id); + stack_size = vm->page_size == 4096 ? DEFAULT_STACK_PGS * vm->page_size : + vm->page_size; + stack_vaddr = __vm_vaddr_alloc(vm, stack_size, + DEFAULT_ARM64_GUEST_STACK_VADDR_MIN, + MEM_REGION_DATA); + aarch64_vcpu_setup(vcpu, init); vcpu_set_reg(vcpu, ARM64_CORE_REG(sp_el1), stack_vaddr + stack_size); @@ -428,8 +441,8 @@ unexpected_exception: void vm_init_descriptor_tables(struct kvm_vm *vm) { - vm->handlers = vm_vaddr_alloc(vm, sizeof(struct handlers), - vm->page_size); + vm->handlers = __vm_vaddr_alloc(vm, sizeof(struct handlers), + vm->page_size, MEM_REGION_DATA); *(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers; } @@ -486,24 +499,15 @@ void aarch64_get_supported_page_sizes(uint32_t ipa, err = ioctl(vcpu_fd, KVM_GET_ONE_REG, ®); TEST_ASSERT(err == 0, KVM_IOCTL_ERROR(KVM_GET_ONE_REG, vcpu_fd)); - *ps4k = ((val >> 28) & 0xf) != 0xf; - *ps64k = ((val >> 24) & 0xf) == 0; - *ps16k = ((val >> 20) & 0xf) != 0; + *ps4k = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_TGRAN4), val) != 0xf; + *ps64k = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_TGRAN64), val) == 0; + *ps16k = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_TGRAN16), val) != 0; close(vcpu_fd); close(vm_fd); close(kvm_fd); } -/* - * arm64 doesn't have a true default mode, so start by computing the - * available IPA space and page sizes early. - */ -void __attribute__((constructor)) init_guest_modes(void) -{ - guest_modes_append_default(); -} - void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5, uint64_t arg6, struct arm_smccc_res *res) @@ -528,3 +532,22 @@ void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1, [arg4] "r"(arg4), [arg5] "r"(arg5), [arg6] "r"(arg6) : "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7"); } + +void kvm_selftest_arch_init(void) +{ + /* + * arm64 doesn't have a true default mode, so start by computing the + * available IPA space and page sizes early. + */ + guest_modes_append_default(); +} + +void vm_vaddr_populate_bitmap(struct kvm_vm *vm) +{ + /* + * arm64 selftests use only TTBR0_EL1, meaning that the valid VA space + * is [0, 2^(64 - TCR_EL1.T0SZ)). + */ + sparsebit_set_num(vm->vpages_valid, 0, + (1ULL << vm->va_bits) >> vm->page_shift); +} diff --git a/tools/testing/selftests/kvm/lib/aarch64/ucall.c b/tools/testing/selftests/kvm/lib/aarch64/ucall.c index ed237b744690..562c16dfbb00 100644 --- a/tools/testing/selftests/kvm/lib/aarch64/ucall.c +++ b/tools/testing/selftests/kvm/lib/aarch64/ucall.c @@ -6,108 +6,36 @@ */ #include "kvm_util.h" +/* + * ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each + * VM), it must not be accessed from host code. + */ static vm_vaddr_t *ucall_exit_mmio_addr; -static bool ucall_mmio_init(struct kvm_vm *vm, vm_paddr_t gpa) -{ - if (kvm_userspace_memory_region_find(vm, gpa, gpa + 1)) - return false; - - virt_pg_map(vm, gpa, gpa); - - ucall_exit_mmio_addr = (vm_vaddr_t *)gpa; - sync_global_to_guest(vm, ucall_exit_mmio_addr); - - return true; -} - -void ucall_init(struct kvm_vm *vm, void *arg) +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) { - vm_paddr_t gpa, start, end, step, offset; - unsigned int bits; - bool ret; + virt_pg_map(vm, mmio_gpa, mmio_gpa); - if (arg) { - gpa = (vm_paddr_t)arg; - ret = ucall_mmio_init(vm, gpa); - TEST_ASSERT(ret, "Can't set ucall mmio address to %lx", gpa); - return; - } + vm->ucall_mmio_addr = mmio_gpa; - /* - * Find an address within the allowed physical and virtual address - * spaces, that does _not_ have a KVM memory region associated with - * it. Identity mapping an address like this allows the guest to - * access it, but as KVM doesn't know what to do with it, it - * will assume it's something userspace handles and exit with - * KVM_EXIT_MMIO. Well, at least that's how it works for AArch64. - * Here we start with a guess that the addresses around 5/8th - * of the allowed space are unmapped and then work both down and - * up from there in 1/16th allowed space sized steps. - * - * Note, we need to use VA-bits - 1 when calculating the allowed - * virtual address space for an identity mapping because the upper - * half of the virtual address space is the two's complement of the - * lower and won't match physical addresses. - */ - bits = vm->va_bits - 1; - bits = min(vm->pa_bits, bits); - end = 1ul << bits; - start = end * 5 / 8; - step = end / 16; - for (offset = 0; offset < end - start; offset += step) { - if (ucall_mmio_init(vm, start - offset)) - return; - if (ucall_mmio_init(vm, start + offset)) - return; - } - TEST_FAIL("Can't find a ucall mmio address"); + write_guest_global(vm, ucall_exit_mmio_addr, (vm_vaddr_t *)mmio_gpa); } -void ucall_uninit(struct kvm_vm *vm) +void ucall_arch_do_ucall(vm_vaddr_t uc) { - ucall_exit_mmio_addr = 0; - sync_global_to_guest(vm, ucall_exit_mmio_addr); + WRITE_ONCE(*ucall_exit_mmio_addr, uc); } -void ucall(uint64_t cmd, int nargs, ...) -{ - struct ucall uc = {}; - va_list va; - int i; - - WRITE_ONCE(uc.cmd, cmd); - nargs = min(nargs, UCALL_MAX_ARGS); - - va_start(va, nargs); - for (i = 0; i < nargs; ++i) - WRITE_ONCE(uc.args[i], va_arg(va, uint64_t)); - va_end(va); - - WRITE_ONCE(*ucall_exit_mmio_addr, (vm_vaddr_t)&uc); -} - -uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_MMIO && - run->mmio.phys_addr == (uint64_t)ucall_exit_mmio_addr) { - vm_vaddr_t gva; - - TEST_ASSERT(run->mmio.is_write && run->mmio.len == 8, + run->mmio.phys_addr == vcpu->vm->ucall_mmio_addr) { + TEST_ASSERT(run->mmio.is_write && run->mmio.len == sizeof(uint64_t), "Unexpected ucall exit mmio address access"); - memcpy(&gva, run->mmio.data, sizeof(gva)); - memcpy(&ucall, addr_gva2hva(vcpu->vm, gva), sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); + return (void *)(*((uint64_t *)run->mmio.data)); } - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/elf.c b/tools/testing/selftests/kvm/lib/elf.c index 9f54c098d9d0..820ac2d08c98 100644 --- a/tools/testing/selftests/kvm/lib/elf.c +++ b/tools/testing/selftests/kvm/lib/elf.c @@ -138,7 +138,7 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename) offset = hdr.e_phoff + (n1 * hdr.e_phentsize); offset_rv = lseek(fd, offset, SEEK_SET); TEST_ASSERT(offset_rv == offset, - "Failed to seek to begining of program header %u,\n" + "Failed to seek to beginning of program header %u,\n" " filename: %s\n" " rv: %jd errno: %i", n1, filename, (intmax_t) offset_rv, errno); @@ -161,7 +161,8 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename) seg_vend |= vm->page_size - 1; size_t seg_size = seg_vend - seg_vstart + 1; - vm_vaddr_t vaddr = vm_vaddr_alloc(vm, seg_size, seg_vstart); + vm_vaddr_t vaddr = __vm_vaddr_alloc(vm, seg_size, seg_vstart, + MEM_REGION_CODE); TEST_ASSERT(vaddr == seg_vstart, "Unable to allocate " "virtual memory for segment at requested min addr,\n" " segment idx: %u\n" diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index f1cb1627161f..c88c3ace16d2 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -11,6 +11,7 @@ #include "processor.h" #include <assert.h> +#include <sched.h> #include <sys/mman.h> #include <sys/types.h> #include <sys/stat.h> @@ -185,12 +186,18 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES, "Missing new mode params?"); -struct kvm_vm *____vm_create(enum vm_guest_mode mode, uint64_t nr_pages) +__weak void vm_vaddr_populate_bitmap(struct kvm_vm *vm) { - struct kvm_vm *vm; + sparsebit_set_num(vm->vpages_valid, + 0, (1ULL << (vm->va_bits - 1)) >> vm->page_shift); + sparsebit_set_num(vm->vpages_valid, + (~((1ULL << (vm->va_bits - 1)) - 1)) >> vm->page_shift, + (1ULL << (vm->va_bits - 1)) >> vm->page_shift); +} - pr_debug("%s: mode='%s' pages='%ld'\n", __func__, - vm_guest_mode_string(mode), nr_pages); +struct kvm_vm *____vm_create(enum vm_guest_mode mode) +{ + struct kvm_vm *vm; vm = calloc(1, sizeof(*vm)); TEST_ASSERT(vm != NULL, "Insufficient Memory"); @@ -276,20 +283,13 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode, uint64_t nr_pages) /* Limit to VA-bit canonical virtual addresses. */ vm->vpages_valid = sparsebit_alloc(); - sparsebit_set_num(vm->vpages_valid, - 0, (1ULL << (vm->va_bits - 1)) >> vm->page_shift); - sparsebit_set_num(vm->vpages_valid, - (~((1ULL << (vm->va_bits - 1)) - 1)) >> vm->page_shift, - (1ULL << (vm->va_bits - 1)) >> vm->page_shift); + vm_vaddr_populate_bitmap(vm); /* Limit physical addresses to PA-bits. */ vm->max_gfn = vm_compute_max_gfn(vm); /* Allocate and setup memory for guest. */ vm->vpages_mapped = sparsebit_alloc(); - if (nr_pages != 0) - vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, - 0, 0, nr_pages, 0); return vm; } @@ -334,15 +334,32 @@ struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint32_t nr_runnable_vcpus, { uint64_t nr_pages = vm_nr_pages_required(mode, nr_runnable_vcpus, nr_extra_pages); + struct userspace_mem_region *slot0; struct kvm_vm *vm; + int i; + + pr_debug("%s: mode='%s' pages='%ld'\n", __func__, + vm_guest_mode_string(mode), nr_pages); - vm = ____vm_create(mode, nr_pages); + vm = ____vm_create(mode); + + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0, 0, nr_pages, 0); + for (i = 0; i < NR_MEM_REGIONS; i++) + vm->memslots[i] = 0; kvm_vm_elf_load(vm, program_invocation_name); -#ifdef __x86_64__ - vm_create_irqchip(vm); -#endif + /* + * TODO: Add proper defines to protect the library's memslots, and then + * carve out memslot1 for the ucall MMIO address. KVM treats writes to + * read-only memslots as MMIO, and creating a read-only memslot for the + * MMIO region would prevent silently clobbering the MMIO region. + */ + slot0 = memslot2region(vm, 0); + ucall_init(vm, slot0->region.guest_phys_addr + slot0->region.memory_size); + + kvm_arch_vm_post_create(vm); + return vm; } @@ -443,6 +460,59 @@ struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm) return vm_vcpu_recreate(vm, 0); } +void kvm_pin_this_task_to_pcpu(uint32_t pcpu) +{ + cpu_set_t mask; + int r; + + CPU_ZERO(&mask); + CPU_SET(pcpu, &mask); + r = sched_setaffinity(0, sizeof(mask), &mask); + TEST_ASSERT(!r, "sched_setaffinity() failed for pCPU '%u'.\n", pcpu); +} + +static uint32_t parse_pcpu(const char *cpu_str, const cpu_set_t *allowed_mask) +{ + uint32_t pcpu = atoi_non_negative("CPU number", cpu_str); + + TEST_ASSERT(CPU_ISSET(pcpu, allowed_mask), + "Not allowed to run on pCPU '%d', check cgroups?\n", pcpu); + return pcpu; +} + +void kvm_parse_vcpu_pinning(const char *pcpus_string, uint32_t vcpu_to_pcpu[], + int nr_vcpus) +{ + cpu_set_t allowed_mask; + char *cpu, *cpu_list; + char delim[2] = ","; + int i, r; + + cpu_list = strdup(pcpus_string); + TEST_ASSERT(cpu_list, "strdup() allocation failed.\n"); + + r = sched_getaffinity(0, sizeof(allowed_mask), &allowed_mask); + TEST_ASSERT(!r, "sched_getaffinity() failed"); + + cpu = strtok(cpu_list, delim); + + /* 1. Get all pcpus for vcpus. */ + for (i = 0; i < nr_vcpus; i++) { + TEST_ASSERT(cpu, "pCPU not provided for vCPU '%d'\n", i); + vcpu_to_pcpu[i] = parse_pcpu(cpu, &allowed_mask); + cpu = strtok(NULL, delim); + } + + /* 2. Check if the main worker needs to be pinned. */ + if (cpu) { + kvm_pin_this_task_to_pcpu(parse_pcpu(cpu, &allowed_mask)); + cpu = strtok(NULL, delim); + } + + TEST_ASSERT(!cpu, "pCPU list contains trailing garbage characters '%s'", cpu); + free(cpu_list); +} + /* * Userspace Memory Region Find * @@ -586,6 +656,12 @@ static void __vm_mem_region_delete(struct kvm_vm *vm, sparsebit_free(®ion->unused_phy_pages); ret = munmap(region->mmap_start, region->mmap_size); TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()", ret)); + if (region->fd >= 0) { + /* There's an extra map when using shared memory. */ + ret = munmap(region->mmap_alias, region->mmap_size); + TEST_ASSERT(!ret, __KVM_SYSCALL_ERROR("munmap()", ret)); + close(region->fd); + } free(region); } @@ -923,6 +999,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, vm_mem_backing_src_alias(src_type)->name); } + region->backing_src_type = src_type; region->unused_phy_pages = sparsebit_alloc(); sparsebit_set_num(region->unused_phy_pages, guest_paddr >> vm->page_shift, npages); @@ -1151,8 +1228,8 @@ struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id) * TEST_ASSERT failure occurs for invalid input or no area of at least * sz unallocated bytes >= vaddr_min is available. */ -static vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz, - vm_vaddr_t vaddr_min) +vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz, + vm_vaddr_t vaddr_min) { uint64_t pages = (sz + vm->page_size - 1) >> vm->page_shift; @@ -1217,32 +1294,15 @@ va_found: return pgidx_start * vm->page_size; } -/* - * VM Virtual Address Allocate - * - * Input Args: - * vm - Virtual Machine - * sz - Size in bytes - * vaddr_min - Minimum starting virtual address - * - * Output Args: None - * - * Return: - * Starting guest virtual address - * - * Allocates at least sz bytes within the virtual address space of the vm - * given by vm. The allocated bytes are mapped to a virtual address >= - * the address given by vaddr_min. Note that each allocation uses a - * a unique set of pages, with the minimum real allocation being at least - * a page. - */ -vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min) +vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type) { uint64_t pages = (sz >> vm->page_shift) + ((sz % vm->page_size) != 0); virt_pgd_alloc(vm); vm_paddr_t paddr = vm_phy_pages_alloc(vm, pages, - KVM_UTIL_MIN_PFN * vm->page_size, 0); + KVM_UTIL_MIN_PFN * vm->page_size, + vm->memslots[type]); /* * Find an unused range of virtual page addresses of at least @@ -1256,14 +1316,37 @@ vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min) virt_pg_map(vm, vaddr, paddr); - sparsebit_set(vm->vpages_mapped, - vaddr >> vm->page_shift); + sparsebit_set(vm->vpages_mapped, vaddr >> vm->page_shift); } return vaddr_start; } /* + * VM Virtual Address Allocate + * + * Input Args: + * vm - Virtual Machine + * sz - Size in bytes + * vaddr_min - Minimum starting virtual address + * + * Output Args: None + * + * Return: + * Starting guest virtual address + * + * Allocates at least sz bytes within the virtual address space of the vm + * given by vm. The allocated bytes are mapped to a virtual address >= + * the address given by vaddr_min. Note that each allocation uses a + * a unique set of pages, with the minimum real allocation being at least + * a page. The allocated physical space comes from the TEST_DATA memory region. + */ +vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min) +{ + return __vm_vaddr_alloc(vm, sz, vaddr_min, MEM_REGION_TEST_DATA); +} + +/* * VM Virtual Address Allocate Pages * * Input Args: @@ -1282,6 +1365,11 @@ vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages) return vm_vaddr_alloc(vm, nr_pages * getpagesize(), KVM_UTIL_MIN_VADDR); } +vm_vaddr_t __vm_vaddr_alloc_page(struct kvm_vm *vm, enum kvm_mem_region_type type) +{ + return __vm_vaddr_alloc(vm, getpagesize(), KVM_UTIL_MIN_VADDR, type); +} + /* * VM Virtual Address Allocate Page * @@ -1330,6 +1418,8 @@ void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, virt_pg_map(vm, vaddr, paddr); vaddr += page_size; paddr += page_size; + + sparsebit_set(vm->vpages_mapped, vaddr >> vm->page_shift); } } @@ -1506,7 +1596,7 @@ struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vcpu *vcpu) void *vcpu_map_dirty_ring(struct kvm_vcpu *vcpu) { - uint32_t page_size = vcpu->vm->page_size; + uint32_t page_size = getpagesize(); uint32_t size = vcpu->vm->dirty_ring_size; TEST_ASSERT(size > 0, "Should enable dirty ring first"); @@ -1847,7 +1937,8 @@ vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min, vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm) { - return vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0); + return vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); } /* @@ -2021,3 +2112,19 @@ void __vm_get_stat(struct kvm_vm *vm, const char *stat_name, uint64_t *data, break; } } + +__weak void kvm_arch_vm_post_create(struct kvm_vm *vm) +{ +} + +__weak void kvm_selftest_arch_init(void) +{ +} + +void __attribute((constructor)) kvm_selftest_init(void) +{ + /* Tell stdout not to buffer its content. */ + setbuf(stdout, NULL); + + kvm_selftest_arch_init(); +} diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/memstress.c index 9618b37c66f7..5f1d3173c238 100644 --- a/tools/testing/selftests/kvm/lib/perf_test_util.c +++ b/tools/testing/selftests/kvm/lib/memstress.c @@ -2,13 +2,15 @@ /* * Copyright (C) 2020, Google LLC. */ +#define _GNU_SOURCE + #include <inttypes.h> #include "kvm_util.h" -#include "perf_test_util.h" +#include "memstress.h" #include "processor.h" -struct perf_test_args perf_test_args; +struct memstress_args memstress_args; /* * Guest virtual memory offset of the testing memory slot. @@ -31,7 +33,7 @@ struct vcpu_thread { static struct vcpu_thread vcpu_threads[KVM_MAX_VCPUS]; /* The function run by each vCPU thread, as provided by the test. */ -static void (*vcpu_thread_fn)(struct perf_test_vcpu_args *); +static void (*vcpu_thread_fn)(struct memstress_vcpu_args *); /* Set to true once all vCPU threads are up and running. */ static bool all_vcpu_threads_running; @@ -42,14 +44,19 @@ static struct kvm_vcpu *vcpus[KVM_MAX_VCPUS]; * Continuously write to the first 8 bytes of each page in the * specified region. */ -void perf_test_guest_code(uint32_t vcpu_idx) +void memstress_guest_code(uint32_t vcpu_idx) { - struct perf_test_args *pta = &perf_test_args; - struct perf_test_vcpu_args *vcpu_args = &pta->vcpu_args[vcpu_idx]; + struct memstress_args *args = &memstress_args; + struct memstress_vcpu_args *vcpu_args = &args->vcpu_args[vcpu_idx]; + struct guest_random_state rand_state; uint64_t gva; uint64_t pages; + uint64_t addr; + uint64_t page; int i; + rand_state = new_guest_random_state(args->random_seed + vcpu_idx); + gva = vcpu_args->gva; pages = vcpu_args->pages; @@ -58,9 +65,14 @@ void perf_test_guest_code(uint32_t vcpu_idx) while (true) { for (i = 0; i < pages; i++) { - uint64_t addr = gva + (i * pta->guest_page_size); + if (args->random_access) + page = guest_random_u32(&rand_state) % pages; + else + page = i; + + addr = gva + (page * args->guest_page_size); - if (i % pta->wr_fract == 0) + if (guest_random_u32(&rand_state) % 100 < args->write_percent) *(uint64_t *)addr = 0x0123456789ABCDEF; else READ_ONCE(*(uint64_t *)addr); @@ -70,17 +82,17 @@ void perf_test_guest_code(uint32_t vcpu_idx) } } -void perf_test_setup_vcpus(struct kvm_vm *vm, int nr_vcpus, +void memstress_setup_vcpus(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[], uint64_t vcpu_memory_bytes, bool partition_vcpu_memory_access) { - struct perf_test_args *pta = &perf_test_args; - struct perf_test_vcpu_args *vcpu_args; + struct memstress_args *args = &memstress_args; + struct memstress_vcpu_args *vcpu_args; int i; for (i = 0; i < nr_vcpus; i++) { - vcpu_args = &pta->vcpu_args[i]; + vcpu_args = &args->vcpu_args[i]; vcpu_args->vcpu = vcpus[i]; vcpu_args->vcpu_idx = i; @@ -89,29 +101,29 @@ void perf_test_setup_vcpus(struct kvm_vm *vm, int nr_vcpus, vcpu_args->gva = guest_test_virt_mem + (i * vcpu_memory_bytes); vcpu_args->pages = vcpu_memory_bytes / - pta->guest_page_size; - vcpu_args->gpa = pta->gpa + (i * vcpu_memory_bytes); + args->guest_page_size; + vcpu_args->gpa = args->gpa + (i * vcpu_memory_bytes); } else { vcpu_args->gva = guest_test_virt_mem; vcpu_args->pages = (nr_vcpus * vcpu_memory_bytes) / - pta->guest_page_size; - vcpu_args->gpa = pta->gpa; + args->guest_page_size; + vcpu_args->gpa = args->gpa; } vcpu_args_set(vcpus[i], 1, i); pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n", i, vcpu_args->gpa, vcpu_args->gpa + - (vcpu_args->pages * pta->guest_page_size)); + (vcpu_args->pages * args->guest_page_size)); } } -struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, +struct kvm_vm *memstress_create_vm(enum vm_guest_mode mode, int nr_vcpus, uint64_t vcpu_memory_bytes, int slots, enum vm_mem_backing_src_type backing_src, bool partition_vcpu_memory_access) { - struct perf_test_args *pta = &perf_test_args; + struct memstress_args *args = &memstress_args; struct kvm_vm *vm; uint64_t guest_num_pages, slot0_pages = 0; uint64_t backing_src_pagesz = get_backing_src_pagesz(backing_src); @@ -121,20 +133,20 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode)); /* By default vCPUs will write to memory. */ - pta->wr_fract = 1; + args->write_percent = 100; /* * Snapshot the non-huge page size. This is used by the guest code to * access/dirty pages at the logging granularity. */ - pta->guest_page_size = vm_guest_mode_params[mode].page_size; + args->guest_page_size = vm_guest_mode_params[mode].page_size; guest_num_pages = vm_adjust_num_guest_pages(mode, - (nr_vcpus * vcpu_memory_bytes) / pta->guest_page_size); + (nr_vcpus * vcpu_memory_bytes) / args->guest_page_size); TEST_ASSERT(vcpu_memory_bytes % getpagesize() == 0, "Guest memory size is not host page size aligned."); - TEST_ASSERT(vcpu_memory_bytes % pta->guest_page_size == 0, + TEST_ASSERT(vcpu_memory_bytes % args->guest_page_size == 0, "Guest memory size is not guest page size aligned."); TEST_ASSERT(guest_num_pages % slots == 0, "Guest memory cannot be evenly divided into %d slots.", @@ -144,8 +156,8 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, * If using nested, allocate extra pages for the nested page tables and * in-memory data structures. */ - if (pta->nested) - slot0_pages += perf_test_nested_pages(nr_vcpus); + if (args->nested) + slot0_pages += memstress_nested_pages(nr_vcpus); /* * Pass guest_num_pages to populate the page tables for test memory. @@ -153,9 +165,9 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, * effect as KVM allows aliasing HVAs in meslots. */ vm = __vm_create_with_vcpus(mode, nr_vcpus, slot0_pages + guest_num_pages, - perf_test_guest_code, vcpus); + memstress_guest_code, vcpus); - pta->vm = vm; + args->vm = vm; /* Put the test region at the top guest physical memory. */ region_end_gfn = vm->max_gfn + 1; @@ -165,8 +177,8 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, * When running vCPUs in L2, restrict the test region to 48 bits to * avoid needing 5-level page tables to identity map L2. */ - if (pta->nested) - region_end_gfn = min(region_end_gfn, (1UL << 48) / pta->guest_page_size); + if (args->nested) + region_end_gfn = min(region_end_gfn, (1UL << 48) / args->guest_page_size); #endif /* * If there should be more memory in the guest test region than there @@ -178,63 +190,72 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int nr_vcpus, " nr_vcpus: %d wss: %" PRIx64 "]\n", guest_num_pages, region_end_gfn - 1, nr_vcpus, vcpu_memory_bytes); - pta->gpa = (region_end_gfn - guest_num_pages - 1) * pta->guest_page_size; - pta->gpa = align_down(pta->gpa, backing_src_pagesz); + args->gpa = (region_end_gfn - guest_num_pages - 1) * args->guest_page_size; + args->gpa = align_down(args->gpa, backing_src_pagesz); #ifdef __s390x__ /* Align to 1M (segment size) */ - pta->gpa = align_down(pta->gpa, 1 << 20); + args->gpa = align_down(args->gpa, 1 << 20); #endif - pta->size = guest_num_pages * pta->guest_page_size; + args->size = guest_num_pages * args->guest_page_size; pr_info("guest physical test memory: [0x%lx, 0x%lx)\n", - pta->gpa, pta->gpa + pta->size); + args->gpa, args->gpa + args->size); /* Add extra memory slots for testing */ for (i = 0; i < slots; i++) { uint64_t region_pages = guest_num_pages / slots; - vm_paddr_t region_start = pta->gpa + region_pages * pta->guest_page_size * i; + vm_paddr_t region_start = args->gpa + region_pages * args->guest_page_size * i; vm_userspace_mem_region_add(vm, backing_src, region_start, - PERF_TEST_MEM_SLOT_INDEX + i, + MEMSTRESS_MEM_SLOT_INDEX + i, region_pages, 0); } /* Do mapping for the demand paging memory slot */ - virt_map(vm, guest_test_virt_mem, pta->gpa, guest_num_pages); + virt_map(vm, guest_test_virt_mem, args->gpa, guest_num_pages); - perf_test_setup_vcpus(vm, nr_vcpus, vcpus, vcpu_memory_bytes, + memstress_setup_vcpus(vm, nr_vcpus, vcpus, vcpu_memory_bytes, partition_vcpu_memory_access); - if (pta->nested) { + if (args->nested) { pr_info("Configuring vCPUs to run in L2 (nested).\n"); - perf_test_setup_nested(vm, nr_vcpus, vcpus); + memstress_setup_nested(vm, nr_vcpus, vcpus); } - ucall_init(vm, NULL); - /* Export the shared variables to the guest. */ - sync_global_to_guest(vm, perf_test_args); + sync_global_to_guest(vm, memstress_args); return vm; } -void perf_test_destroy_vm(struct kvm_vm *vm) +void memstress_destroy_vm(struct kvm_vm *vm) { - ucall_uninit(vm); kvm_vm_free(vm); } -void perf_test_set_wr_fract(struct kvm_vm *vm, int wr_fract) +void memstress_set_write_percent(struct kvm_vm *vm, uint32_t write_percent) { - perf_test_args.wr_fract = wr_fract; - sync_global_to_guest(vm, perf_test_args); + memstress_args.write_percent = write_percent; + sync_global_to_guest(vm, memstress_args.write_percent); } -uint64_t __weak perf_test_nested_pages(int nr_vcpus) +void memstress_set_random_seed(struct kvm_vm *vm, uint32_t random_seed) +{ + memstress_args.random_seed = random_seed; + sync_global_to_guest(vm, memstress_args.random_seed); +} + +void memstress_set_random_access(struct kvm_vm *vm, bool random_access) +{ + memstress_args.random_access = random_access; + sync_global_to_guest(vm, memstress_args.random_access); +} + +uint64_t __weak memstress_nested_pages(int nr_vcpus) { return 0; } -void __weak perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu **vcpus) +void __weak memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu **vcpus) { pr_info("%s() not support on this architecture, skipping.\n", __func__); exit(KSFT_SKIP); @@ -243,6 +264,10 @@ void __weak perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_v static void *vcpu_thread_main(void *data) { struct vcpu_thread *vcpu = data; + int vcpu_idx = vcpu->vcpu_idx; + + if (memstress_args.pin_vcpus) + kvm_pin_this_task_to_pcpu(memstress_args.vcpu_to_pcpu[vcpu_idx]); WRITE_ONCE(vcpu->running, true); @@ -255,18 +280,19 @@ static void *vcpu_thread_main(void *data) while (!READ_ONCE(all_vcpu_threads_running)) ; - vcpu_thread_fn(&perf_test_args.vcpu_args[vcpu->vcpu_idx]); + vcpu_thread_fn(&memstress_args.vcpu_args[vcpu_idx]); return NULL; } -void perf_test_start_vcpu_threads(int nr_vcpus, - void (*vcpu_fn)(struct perf_test_vcpu_args *)) +void memstress_start_vcpu_threads(int nr_vcpus, + void (*vcpu_fn)(struct memstress_vcpu_args *)) { int i; vcpu_thread_fn = vcpu_fn; WRITE_ONCE(all_vcpu_threads_running, false); + WRITE_ONCE(memstress_args.stop_vcpus, false); for (i = 0; i < nr_vcpus; i++) { struct vcpu_thread *vcpu = &vcpu_threads[i]; @@ -285,10 +311,12 @@ void perf_test_start_vcpu_threads(int nr_vcpus, WRITE_ONCE(all_vcpu_threads_running, true); } -void perf_test_join_vcpu_threads(int nr_vcpus) +void memstress_join_vcpu_threads(int nr_vcpus) { int i; + WRITE_ONCE(memstress_args.stop_vcpus, true); + for (i = 0; i < nr_vcpus; i++) pthread_join(vcpu_threads[i].thread, NULL); } diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c index 604478151212..d146ca71e0c0 100644 --- a/tools/testing/selftests/kvm/lib/riscv/processor.c +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c @@ -55,13 +55,15 @@ static uint64_t pte_index(struct kvm_vm *vm, vm_vaddr_t gva, int level) void virt_arch_pgd_alloc(struct kvm_vm *vm) { - if (!vm->pgd_created) { - vm_paddr_t paddr = vm_phy_pages_alloc(vm, - page_align(vm, ptrs_per_pte(vm) * 8) / vm->page_size, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0); - vm->pgd = paddr; - vm->pgd_created = true; - } + size_t nr_pages = page_align(vm, ptrs_per_pte(vm) * 8) / vm->page_size; + + if (vm->pgd_created) + return; + + vm->pgd = vm_phy_pages_alloc(vm, nr_pages, + KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); + vm->pgd_created = true; } void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr) @@ -279,15 +281,18 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, void *guest_code) { int r; - size_t stack_size = vm->page_size == 4096 ? - DEFAULT_STACK_PGS * vm->page_size : - vm->page_size; - unsigned long stack_vaddr = vm_vaddr_alloc(vm, stack_size, - DEFAULT_RISCV_GUEST_STACK_VADDR_MIN); + size_t stack_size; + unsigned long stack_vaddr; unsigned long current_gp = 0; struct kvm_mp_state mps; struct kvm_vcpu *vcpu; + stack_size = vm->page_size == 4096 ? DEFAULT_STACK_PGS * vm->page_size : + vm->page_size; + stack_vaddr = __vm_vaddr_alloc(vm, stack_size, + DEFAULT_RISCV_GUEST_STACK_VADDR_MIN, + MEM_REGION_DATA); + vcpu = __vm_vcpu_add(vm, vcpu_id); riscv_vcpu_mmu_setup(vcpu); diff --git a/tools/testing/selftests/kvm/lib/riscv/ucall.c b/tools/testing/selftests/kvm/lib/riscv/ucall.c index 087b9740bc8f..9a3476a2dfca 100644 --- a/tools/testing/selftests/kvm/lib/riscv/ucall.c +++ b/tools/testing/selftests/kvm/lib/riscv/ucall.c @@ -10,11 +10,7 @@ #include "kvm_util.h" #include "processor.h" -void ucall_init(struct kvm_vm *vm, void *arg) -{ -} - -void ucall_uninit(struct kvm_vm *vm) +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) { } @@ -44,47 +40,22 @@ struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0, return ret; } -void ucall(uint64_t cmd, int nargs, ...) +void ucall_arch_do_ucall(vm_vaddr_t uc) { - struct ucall uc = { - .cmd = cmd, - }; - va_list va; - int i; - - nargs = min(nargs, UCALL_MAX_ARGS); - - va_start(va, nargs); - for (i = 0; i < nargs; ++i) - uc.args[i] = va_arg(va, uint64_t); - va_end(va); - sbi_ecall(KVM_RISCV_SELFTESTS_SBI_EXT, KVM_RISCV_SELFTESTS_SBI_UCALL, - (vm_vaddr_t)&uc, 0, 0, 0, 0, 0); + uc, 0, 0, 0, 0, 0); } -uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_RISCV_SBI && run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT) { switch (run->riscv_sbi.function_id) { case KVM_RISCV_SELFTESTS_SBI_UCALL: - memcpy(&ucall, - addr_gva2hva(vcpu->vm, run->riscv_sbi.args[0]), - sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); - - break; + return (void *)run->riscv_sbi.args[0]; case KVM_RISCV_SELFTESTS_SBI_UNEXP: vcpu_dump(stderr, vcpu, 2); TEST_ASSERT(0, "Unexpected trap taken by guest"); @@ -93,6 +64,5 @@ uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) break; } } - - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c index 89d7340d9cbd..15945121daf1 100644 --- a/tools/testing/selftests/kvm/lib/s390x/processor.c +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c @@ -21,7 +21,8 @@ void virt_arch_pgd_alloc(struct kvm_vm *vm) return; paddr = vm_phy_pages_alloc(vm, PAGES_PER_REGION, - KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0); + KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); memset(addr_gpa2hva(vm, paddr), 0xff, PAGES_PER_REGION * vm->page_size); vm->pgd = paddr; @@ -167,8 +168,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x", vm->page_size); - stack_vaddr = vm_vaddr_alloc(vm, stack_size, - DEFAULT_GUEST_STACK_VADDR_MIN); + stack_vaddr = __vm_vaddr_alloc(vm, stack_size, + DEFAULT_GUEST_STACK_VADDR_MIN, + MEM_REGION_DATA); vcpu = __vm_vcpu_add(vm, vcpu_id); diff --git a/tools/testing/selftests/kvm/lib/s390x/ucall.c b/tools/testing/selftests/kvm/lib/s390x/ucall.c index 73dc4e21190f..a7f02dc372cf 100644 --- a/tools/testing/selftests/kvm/lib/s390x/ucall.c +++ b/tools/testing/selftests/kvm/lib/s390x/ucall.c @@ -6,40 +6,19 @@ */ #include "kvm_util.h" -void ucall_init(struct kvm_vm *vm, void *arg) +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) { } -void ucall_uninit(struct kvm_vm *vm) +void ucall_arch_do_ucall(vm_vaddr_t uc) { -} - -void ucall(uint64_t cmd, int nargs, ...) -{ - struct ucall uc = { - .cmd = cmd, - }; - va_list va; - int i; - - nargs = min(nargs, UCALL_MAX_ARGS); - - va_start(va, nargs); - for (i = 0; i < nargs; ++i) - uc.args[i] = va_arg(va, uint64_t); - va_end(va); - /* Exit via DIAGNOSE 0x501 (normally used for breakpoints) */ - asm volatile ("diag 0,%0,0x501" : : "a"(&uc) : "memory"); + asm volatile ("diag 0,%0,0x501" : : "a"(uc) : "memory"); } -uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_S390_SIEIC && run->s390_sieic.icptcode == 4 && @@ -47,13 +26,7 @@ uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) (run->s390_sieic.ipb >> 16) == 0x501) { int reg = run->s390_sieic.ipa & 0xf; - memcpy(&ucall, addr_gva2hva(vcpu->vm, run->s.regs.gprs[reg]), - sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); + return (void *)run->s.regs.gprs[reg]; } - - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index 6d23878bbfe1..5c22fa4c2825 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -18,6 +18,23 @@ #include "test_util.h" /* + * Random number generator that is usable from guest code. This is the + * Park-Miller LCG using standard constants. + */ + +struct guest_random_state new_guest_random_state(uint32_t seed) +{ + struct guest_random_state s = {.seed = seed}; + return s; +} + +uint32_t guest_random_u32(struct guest_random_state *state) +{ + state->seed = (uint64_t)state->seed * 48271 % ((uint32_t)(1 << 31) - 1); + return state->seed; +} + +/* * Parses "[0-9]+[kmgt]?". */ size_t parse_size(const char *size) @@ -334,3 +351,22 @@ long get_run_delay(void) return val[1]; } + +int atoi_paranoid(const char *num_str) +{ + char *end_ptr; + long num; + + errno = 0; + num = strtol(num_str, &end_ptr, 0); + TEST_ASSERT(!errno, "strtol(\"%s\") failed", num_str); + TEST_ASSERT(num_str != end_ptr, + "strtol(\"%s\") didn't find a valid integer.", num_str); + TEST_ASSERT(*end_ptr == '\0', + "strtol(\"%s\") failed to parse trailing characters \"%s\".", + num_str, end_ptr); + TEST_ASSERT(num >= INT_MIN && num <= INT_MAX, + "%ld not in range of [%d, %d]", num, INT_MIN, INT_MAX); + + return num; +} diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c new file mode 100644 index 000000000000..0cc0971ce60e --- /dev/null +++ b/tools/testing/selftests/kvm/lib/ucall_common.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include "kvm_util.h" +#include "linux/types.h" +#include "linux/bitmap.h" +#include "linux/atomic.h" + +struct ucall_header { + DECLARE_BITMAP(in_use, KVM_MAX_VCPUS); + struct ucall ucalls[KVM_MAX_VCPUS]; +}; + +/* + * ucall_pool holds per-VM values (global data is duplicated by each VM), it + * must not be accessed from host code. + */ +static struct ucall_header *ucall_pool; + +void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) +{ + struct ucall_header *hdr; + struct ucall *uc; + vm_vaddr_t vaddr; + int i; + + vaddr = __vm_vaddr_alloc(vm, sizeof(*hdr), KVM_UTIL_MIN_VADDR, MEM_REGION_DATA); + hdr = (struct ucall_header *)addr_gva2hva(vm, vaddr); + memset(hdr, 0, sizeof(*hdr)); + + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + uc = &hdr->ucalls[i]; + uc->hva = uc; + } + + write_guest_global(vm, ucall_pool, (struct ucall_header *)vaddr); + + ucall_arch_init(vm, mmio_gpa); +} + +static struct ucall *ucall_alloc(void) +{ + struct ucall *uc; + int i; + + GUEST_ASSERT(ucall_pool); + + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + if (!test_and_set_bit(i, ucall_pool->in_use)) { + uc = &ucall_pool->ucalls[i]; + memset(uc->args, 0, sizeof(uc->args)); + return uc; + } + } + + GUEST_ASSERT(0); + return NULL; +} + +static void ucall_free(struct ucall *uc) +{ + /* Beware, here be pointer arithmetic. */ + clear_bit(uc - ucall_pool->ucalls, ucall_pool->in_use); +} + +void ucall(uint64_t cmd, int nargs, ...) +{ + struct ucall *uc; + va_list va; + int i; + + uc = ucall_alloc(); + + WRITE_ONCE(uc->cmd, cmd); + + nargs = min(nargs, UCALL_MAX_ARGS); + + va_start(va, nargs); + for (i = 0; i < nargs; ++i) + WRITE_ONCE(uc->args[i], va_arg(va, uint64_t)); + va_end(va); + + ucall_arch_do_ucall((vm_vaddr_t)uc->hva); + + ucall_free(uc); +} + +uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +{ + struct ucall ucall; + void *addr; + + if (!uc) + uc = &ucall; + + addr = ucall_arch_get_ucall(vcpu); + if (addr) { + memcpy(uc, addr, sizeof(*uc)); + vcpu_run_complete_io(vcpu); + } else { + memset(uc, 0, sizeof(*uc)); + } + + return uc->cmd; +} diff --git a/tools/testing/selftests/kvm/lib/userfaultfd_util.c b/tools/testing/selftests/kvm/lib/userfaultfd_util.c new file mode 100644 index 000000000000..92cef20902f1 --- /dev/null +++ b/tools/testing/selftests/kvm/lib/userfaultfd_util.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KVM userfaultfd util + * Adapted from demand_paging_test.c + * + * Copyright (C) 2018, Red Hat, Inc. + * Copyright (C) 2019-2022 Google LLC + */ + +#define _GNU_SOURCE /* for pipe2 */ + +#include <inttypes.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <poll.h> +#include <pthread.h> +#include <linux/userfaultfd.h> +#include <sys/syscall.h> + +#include "kvm_util.h" +#include "test_util.h" +#include "memstress.h" +#include "userfaultfd_util.h" + +#ifdef __NR_userfaultfd + +static void *uffd_handler_thread_fn(void *arg) +{ + struct uffd_desc *uffd_desc = (struct uffd_desc *)arg; + int uffd = uffd_desc->uffd; + int pipefd = uffd_desc->pipefds[0]; + useconds_t delay = uffd_desc->delay; + int64_t pages = 0; + struct timespec start; + struct timespec ts_diff; + + clock_gettime(CLOCK_MONOTONIC, &start); + while (1) { + struct uffd_msg msg; + struct pollfd pollfd[2]; + char tmp_chr; + int r; + + pollfd[0].fd = uffd; + pollfd[0].events = POLLIN; + pollfd[1].fd = pipefd; + pollfd[1].events = POLLIN; + + r = poll(pollfd, 2, -1); + switch (r) { + case -1: + pr_info("poll err"); + continue; + case 0: + continue; + case 1: + break; + default: + pr_info("Polling uffd returned %d", r); + return NULL; + } + + if (pollfd[0].revents & POLLERR) { + pr_info("uffd revents has POLLERR"); + return NULL; + } + + if (pollfd[1].revents & POLLIN) { + r = read(pollfd[1].fd, &tmp_chr, 1); + TEST_ASSERT(r == 1, + "Error reading pipefd in UFFD thread\n"); + return NULL; + } + + if (!(pollfd[0].revents & POLLIN)) + continue; + + r = read(uffd, &msg, sizeof(msg)); + if (r == -1) { + if (errno == EAGAIN) + continue; + pr_info("Read of uffd got errno %d\n", errno); + return NULL; + } + + if (r != sizeof(msg)) { + pr_info("Read on uffd returned unexpected size: %d bytes", r); + return NULL; + } + + if (!(msg.event & UFFD_EVENT_PAGEFAULT)) + continue; + + if (delay) + usleep(delay); + r = uffd_desc->handler(uffd_desc->uffd_mode, uffd, &msg); + if (r < 0) + return NULL; + pages++; + } + + ts_diff = timespec_elapsed(start); + PER_VCPU_DEBUG("userfaulted %ld pages over %ld.%.9lds. (%f/sec)\n", + pages, ts_diff.tv_sec, ts_diff.tv_nsec, + pages / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0)); + + return NULL; +} + +struct uffd_desc *uffd_setup_demand_paging(int uffd_mode, useconds_t delay, + void *hva, uint64_t len, + uffd_handler_t handler) +{ + struct uffd_desc *uffd_desc; + bool is_minor = (uffd_mode == UFFDIO_REGISTER_MODE_MINOR); + int uffd; + struct uffdio_api uffdio_api; + struct uffdio_register uffdio_register; + uint64_t expected_ioctls = ((uint64_t) 1) << _UFFDIO_COPY; + int ret; + + PER_PAGE_DEBUG("Userfaultfd %s mode, faults resolved with %s\n", + is_minor ? "MINOR" : "MISSING", + is_minor ? "UFFDIO_CONINUE" : "UFFDIO_COPY"); + + uffd_desc = malloc(sizeof(struct uffd_desc)); + TEST_ASSERT(uffd_desc, "malloc failed"); + + /* In order to get minor faults, prefault via the alias. */ + if (is_minor) + expected_ioctls = ((uint64_t) 1) << _UFFDIO_CONTINUE; + + uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); + TEST_ASSERT(uffd >= 0, "uffd creation failed, errno: %d", errno); + + uffdio_api.api = UFFD_API; + uffdio_api.features = 0; + TEST_ASSERT(ioctl(uffd, UFFDIO_API, &uffdio_api) != -1, + "ioctl UFFDIO_API failed: %" PRIu64, + (uint64_t)uffdio_api.api); + + uffdio_register.range.start = (uint64_t)hva; + uffdio_register.range.len = len; + uffdio_register.mode = uffd_mode; + TEST_ASSERT(ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) != -1, + "ioctl UFFDIO_REGISTER failed"); + TEST_ASSERT((uffdio_register.ioctls & expected_ioctls) == + expected_ioctls, "missing userfaultfd ioctls"); + + ret = pipe2(uffd_desc->pipefds, O_CLOEXEC | O_NONBLOCK); + TEST_ASSERT(!ret, "Failed to set up pipefd"); + + uffd_desc->uffd_mode = uffd_mode; + uffd_desc->uffd = uffd; + uffd_desc->delay = delay; + uffd_desc->handler = handler; + pthread_create(&uffd_desc->thread, NULL, uffd_handler_thread_fn, + uffd_desc); + + PER_VCPU_DEBUG("Created uffd thread for HVA range [%p, %p)\n", + hva, hva + len); + + return uffd_desc; +} + +void uffd_stop_demand_paging(struct uffd_desc *uffd) +{ + char c = 0; + int ret; + + ret = write(uffd->pipefds[1], &c, 1); + TEST_ASSERT(ret == 1, "Unable to write to pipefd"); + + ret = pthread_join(uffd->thread, NULL); + TEST_ASSERT(ret == 0, "Pthread_join failed."); + + close(uffd->uffd); + + close(uffd->pipefds[1]); + close(uffd->pipefds[0]); + + free(uffd); +} + +#endif /* __NR_userfaultfd */ diff --git a/tools/testing/selftests/kvm/lib/x86_64/hyperv.c b/tools/testing/selftests/kvm/lib/x86_64/hyperv.c new file mode 100644 index 000000000000..efb7e7a1354d --- /dev/null +++ b/tools/testing/selftests/kvm/lib/x86_64/hyperv.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Hyper-V specific functions. + * + * Copyright (C) 2021, Red Hat Inc. + */ +#include <stdint.h> +#include "processor.h" +#include "hyperv.h" + +struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm, + vm_vaddr_t *p_hv_pages_gva) +{ + vm_vaddr_t hv_pages_gva = vm_vaddr_alloc_page(vm); + struct hyperv_test_pages *hv = addr_gva2hva(vm, hv_pages_gva); + + /* Setup of a region of guest memory for the VP Assist page. */ + hv->vp_assist = (void *)vm_vaddr_alloc_page(vm); + hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist); + hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist); + + /* Setup of a region of guest memory for the partition assist page. */ + hv->partition_assist = (void *)vm_vaddr_alloc_page(vm); + hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist); + hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist); + + /* Setup of a region of guest memory for the enlightened VMCS. */ + hv->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm); + hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs); + hv->enlightened_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)hv->enlightened_vmcs); + + *p_hv_pages_gva = hv_pages_gva; + return hv; +} + +int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist) +{ + uint64_t val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) | + HV_X64_MSR_VP_ASSIST_PAGE_ENABLE; + + wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val); + + current_vp_assist = vp_assist; + + return 0; +} diff --git a/tools/testing/selftests/kvm/lib/x86_64/perf_test_util.c b/tools/testing/selftests/kvm/lib/x86_64/memstress.c index 0f344a7c89c4..d61e623afc8c 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/perf_test_util.c +++ b/tools/testing/selftests/kvm/lib/x86_64/memstress.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * x86_64-specific extensions to perf_test_util.c. + * x86_64-specific extensions to memstress.c. * * Copyright (C) 2022, Google, Inc. */ @@ -11,25 +11,25 @@ #include "test_util.h" #include "kvm_util.h" -#include "perf_test_util.h" +#include "memstress.h" #include "processor.h" #include "vmx.h" -void perf_test_l2_guest_code(uint64_t vcpu_id) +void memstress_l2_guest_code(uint64_t vcpu_id) { - perf_test_guest_code(vcpu_id); + memstress_guest_code(vcpu_id); vmcall(); } -extern char perf_test_l2_guest_entry[]; +extern char memstress_l2_guest_entry[]; __asm__( -"perf_test_l2_guest_entry:" +"memstress_l2_guest_entry:" " mov (%rsp), %rdi;" -" call perf_test_l2_guest_code;" +" call memstress_l2_guest_code;" " ud2;" ); -static void perf_test_l1_guest_code(struct vmx_pages *vmx, uint64_t vcpu_id) +static void memstress_l1_guest_code(struct vmx_pages *vmx, uint64_t vcpu_id) { #define L2_GUEST_STACK_SIZE 64 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; @@ -42,14 +42,14 @@ static void perf_test_l1_guest_code(struct vmx_pages *vmx, uint64_t vcpu_id) rsp = &l2_guest_stack[L2_GUEST_STACK_SIZE - 1]; *rsp = vcpu_id; - prepare_vmcs(vmx, perf_test_l2_guest_entry, rsp); + prepare_vmcs(vmx, memstress_l2_guest_entry, rsp); GUEST_ASSERT(!vmlaunch()); GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); GUEST_DONE(); } -uint64_t perf_test_nested_pages(int nr_vcpus) +uint64_t memstress_nested_pages(int nr_vcpus) { /* * 513 page tables is enough to identity-map 256 TiB of L2 with 1G @@ -59,7 +59,7 @@ uint64_t perf_test_nested_pages(int nr_vcpus) return 513 + 10 * nr_vcpus; } -void perf_test_setup_ept(struct vmx_pages *vmx, struct kvm_vm *vm) +void memstress_setup_ept(struct vmx_pages *vmx, struct kvm_vm *vm) { uint64_t start, end; @@ -72,12 +72,12 @@ void perf_test_setup_ept(struct vmx_pages *vmx, struct kvm_vm *vm) */ nested_identity_map_1g(vmx, vm, 0, 0x100000000ULL); - start = align_down(perf_test_args.gpa, PG_SIZE_1G); - end = align_up(perf_test_args.gpa + perf_test_args.size, PG_SIZE_1G); + start = align_down(memstress_args.gpa, PG_SIZE_1G); + end = align_up(memstress_args.gpa + memstress_args.size, PG_SIZE_1G); nested_identity_map_1g(vmx, vm, start, end - start); } -void perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[]) +void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[]) { struct vmx_pages *vmx, *vmx0 = NULL; struct kvm_regs regs; @@ -85,12 +85,13 @@ void perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vc int vcpu_id; TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX)); + TEST_REQUIRE(kvm_cpu_has_ept()); for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) { vmx = vcpu_alloc_vmx(vm, &vmx_gva); if (vcpu_id == 0) { - perf_test_setup_ept(vmx, vm); + memstress_setup_ept(vmx, vm); vmx0 = vmx; } else { /* Share the same EPT table across all vCPUs. */ @@ -100,11 +101,11 @@ void perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vc } /* - * Override the vCPU to run perf_test_l1_guest_code() which will - * bounce it into L2 before calling perf_test_guest_code(). + * Override the vCPU to run memstress_l1_guest_code() which will + * bounce it into L2 before calling memstress_guest_code(). */ vcpu_regs_get(vcpus[vcpu_id], ®s); - regs.rip = (unsigned long) perf_test_l1_guest_code; + regs.rip = (unsigned long) memstress_l1_guest_code; vcpu_regs_set(vcpus[vcpu_id], ®s); vcpu_args_set(vcpus[vcpu_id], 2, vmx_gva, vcpu_id); } diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index 41c1c73c464d..c4d368d56cfe 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -131,23 +131,28 @@ void virt_arch_pgd_alloc(struct kvm_vm *vm) } } -static void *virt_get_pte(struct kvm_vm *vm, uint64_t pt_pfn, uint64_t vaddr, - int level) +static void *virt_get_pte(struct kvm_vm *vm, uint64_t *parent_pte, + uint64_t vaddr, int level) { - uint64_t *page_table = addr_gpa2hva(vm, pt_pfn << vm->page_shift); + uint64_t pt_gpa = PTE_GET_PA(*parent_pte); + uint64_t *page_table = addr_gpa2hva(vm, pt_gpa); int index = (vaddr >> PG_LEVEL_SHIFT(level)) & 0x1ffu; + TEST_ASSERT((*parent_pte & PTE_PRESENT_MASK) || parent_pte == &vm->pgd, + "Parent PTE (level %d) not PRESENT for gva: 0x%08lx", + level + 1, vaddr); + return &page_table[index]; } static uint64_t *virt_create_upper_pte(struct kvm_vm *vm, - uint64_t pt_pfn, + uint64_t *parent_pte, uint64_t vaddr, uint64_t paddr, int current_level, int target_level) { - uint64_t *pte = virt_get_pte(vm, pt_pfn, vaddr, current_level); + uint64_t *pte = virt_get_pte(vm, parent_pte, vaddr, current_level); if (!(*pte & PTE_PRESENT_MASK)) { *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK; @@ -197,21 +202,20 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) * Allocate upper level page tables, if not already present. Return * early if a hugepage was created. */ - pml4e = virt_create_upper_pte(vm, vm->pgd >> vm->page_shift, - vaddr, paddr, PG_LEVEL_512G, level); + pml4e = virt_create_upper_pte(vm, &vm->pgd, vaddr, paddr, PG_LEVEL_512G, level); if (*pml4e & PTE_LARGE_MASK) return; - pdpe = virt_create_upper_pte(vm, PTE_GET_PFN(*pml4e), vaddr, paddr, PG_LEVEL_1G, level); + pdpe = virt_create_upper_pte(vm, pml4e, vaddr, paddr, PG_LEVEL_1G, level); if (*pdpe & PTE_LARGE_MASK) return; - pde = virt_create_upper_pte(vm, PTE_GET_PFN(*pdpe), vaddr, paddr, PG_LEVEL_2M, level); + pde = virt_create_upper_pte(vm, pdpe, vaddr, paddr, PG_LEVEL_2M, level); if (*pde & PTE_LARGE_MASK) return; /* Fill in page table entry. */ - pte = virt_get_pte(vm, PTE_GET_PFN(*pde), vaddr, PG_LEVEL_4K); + pte = virt_get_pte(vm, pde, vaddr, PG_LEVEL_4K); TEST_ASSERT(!(*pte & PTE_PRESENT_MASK), "PTE already present for 4k page at vaddr: 0x%lx\n", vaddr); *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK | (paddr & PHYSICAL_PAGE_MASK); @@ -241,30 +245,25 @@ void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, } } -static uint64_t *_vm_get_page_table_entry(struct kvm_vm *vm, - struct kvm_vcpu *vcpu, - uint64_t vaddr) +static bool vm_is_target_pte(uint64_t *pte, int *level, int current_level) { - uint16_t index[4]; - uint64_t *pml4e, *pdpe, *pde; - uint64_t *pte; - struct kvm_sregs sregs; - uint64_t rsvd_mask = 0; + if (*pte & PTE_LARGE_MASK) { + TEST_ASSERT(*level == PG_LEVEL_NONE || + *level == current_level, + "Unexpected hugepage at level %d\n", current_level); + *level = current_level; + } - /* Set the high bits in the reserved mask. */ - if (vm->pa_bits < 52) - rsvd_mask = GENMASK_ULL(51, vm->pa_bits); + return *level == current_level; +} - /* - * SDM vol 3, fig 4-11 "Formats of CR3 and Paging-Structure Entries - * with 4-Level Paging and 5-Level Paging". - * If IA32_EFER.NXE = 0 and the P flag of a paging-structure entry is 1, - * the XD flag (bit 63) is reserved. - */ - vcpu_sregs_get(vcpu, &sregs); - if ((sregs.efer & EFER_NX) == 0) { - rsvd_mask |= PTE_NX_MASK; - } +uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, + int *level) +{ + uint64_t *pml4e, *pdpe, *pde; + + TEST_ASSERT(*level >= PG_LEVEL_NONE && *level < PG_LEVEL_NUM, + "Invalid PG_LEVEL_* '%d'", *level); TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " "unknown or unsupported guest mode, mode: 0x%x", vm->mode); @@ -279,54 +278,26 @@ static uint64_t *_vm_get_page_table_entry(struct kvm_vm *vm, TEST_ASSERT(vaddr == (((int64_t)vaddr << 16) >> 16), "Canonical check failed. The virtual address is invalid."); - index[0] = (vaddr >> 12) & 0x1ffu; - index[1] = (vaddr >> 21) & 0x1ffu; - index[2] = (vaddr >> 30) & 0x1ffu; - index[3] = (vaddr >> 39) & 0x1ffu; - - pml4e = addr_gpa2hva(vm, vm->pgd); - TEST_ASSERT(pml4e[index[3]] & PTE_PRESENT_MASK, - "Expected pml4e to be present for gva: 0x%08lx", vaddr); - TEST_ASSERT((pml4e[index[3]] & (rsvd_mask | PTE_LARGE_MASK)) == 0, - "Unexpected reserved bits set."); - - pdpe = addr_gpa2hva(vm, PTE_GET_PFN(pml4e[index[3]]) * vm->page_size); - TEST_ASSERT(pdpe[index[2]] & PTE_PRESENT_MASK, - "Expected pdpe to be present for gva: 0x%08lx", vaddr); - TEST_ASSERT(!(pdpe[index[2]] & PTE_LARGE_MASK), - "Expected pdpe to map a pde not a 1-GByte page."); - TEST_ASSERT((pdpe[index[2]] & rsvd_mask) == 0, - "Unexpected reserved bits set."); + pml4e = virt_get_pte(vm, &vm->pgd, vaddr, PG_LEVEL_512G); + if (vm_is_target_pte(pml4e, level, PG_LEVEL_512G)) + return pml4e; - pde = addr_gpa2hva(vm, PTE_GET_PFN(pdpe[index[2]]) * vm->page_size); - TEST_ASSERT(pde[index[1]] & PTE_PRESENT_MASK, - "Expected pde to be present for gva: 0x%08lx", vaddr); - TEST_ASSERT(!(pde[index[1]] & PTE_LARGE_MASK), - "Expected pde to map a pte not a 2-MByte page."); - TEST_ASSERT((pde[index[1]] & rsvd_mask) == 0, - "Unexpected reserved bits set."); + pdpe = virt_get_pte(vm, pml4e, vaddr, PG_LEVEL_1G); + if (vm_is_target_pte(pdpe, level, PG_LEVEL_1G)) + return pdpe; - pte = addr_gpa2hva(vm, PTE_GET_PFN(pde[index[1]]) * vm->page_size); - TEST_ASSERT(pte[index[0]] & PTE_PRESENT_MASK, - "Expected pte to be present for gva: 0x%08lx", vaddr); + pde = virt_get_pte(vm, pdpe, vaddr, PG_LEVEL_2M); + if (vm_is_target_pte(pde, level, PG_LEVEL_2M)) + return pde; - return &pte[index[0]]; + return virt_get_pte(vm, pde, vaddr, PG_LEVEL_4K); } -uint64_t vm_get_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu, - uint64_t vaddr) +uint64_t *vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr) { - uint64_t *pte = _vm_get_page_table_entry(vm, vcpu, vaddr); + int level = PG_LEVEL_4K; - return *(uint64_t *)pte; -} - -void vm_set_page_table_entry(struct kvm_vm *vm, struct kvm_vcpu *vcpu, - uint64_t vaddr, uint64_t pte) -{ - uint64_t *new_pte = _vm_get_page_table_entry(vm, vcpu, vaddr); - - *(uint64_t *)new_pte = pte; + return __vm_get_page_table_entry(vm, vaddr, &level); } void virt_arch_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) @@ -512,47 +483,23 @@ static void kvm_seg_set_kernel_data_64bit(struct kvm_vm *vm, uint16_t selector, vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) { - uint16_t index[4]; - uint64_t *pml4e, *pdpe, *pde; - uint64_t *pte; - - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); - - index[0] = (gva >> 12) & 0x1ffu; - index[1] = (gva >> 21) & 0x1ffu; - index[2] = (gva >> 30) & 0x1ffu; - index[3] = (gva >> 39) & 0x1ffu; - - if (!vm->pgd_created) - goto unmapped_gva; - pml4e = addr_gpa2hva(vm, vm->pgd); - if (!(pml4e[index[3]] & PTE_PRESENT_MASK)) - goto unmapped_gva; - - pdpe = addr_gpa2hva(vm, PTE_GET_PFN(pml4e[index[3]]) * vm->page_size); - if (!(pdpe[index[2]] & PTE_PRESENT_MASK)) - goto unmapped_gva; - - pde = addr_gpa2hva(vm, PTE_GET_PFN(pdpe[index[2]]) * vm->page_size); - if (!(pde[index[1]] & PTE_PRESENT_MASK)) - goto unmapped_gva; + int level = PG_LEVEL_NONE; + uint64_t *pte = __vm_get_page_table_entry(vm, gva, &level); - pte = addr_gpa2hva(vm, PTE_GET_PFN(pde[index[1]]) * vm->page_size); - if (!(pte[index[0]] & PTE_PRESENT_MASK)) - goto unmapped_gva; + TEST_ASSERT(*pte & PTE_PRESENT_MASK, + "Leaf PTE not PRESENT for gva: 0x%08lx", gva); - return (PTE_GET_PFN(pte[index[0]]) * vm->page_size) + (gva & ~PAGE_MASK); - -unmapped_gva: - TEST_FAIL("No mapping for vm virtual address, gva: 0x%lx", gva); - exit(EXIT_FAILURE); + /* + * No need for a hugepage mask on the PTE, x86-64 requires the "unused" + * address bits to be zero. + */ + return PTE_GET_PA(*pte) | (gva & ~HUGEPAGE_MASK(level)); } static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt) { if (!vm->gdt) - vm->gdt = vm_vaddr_alloc_page(vm); + vm->gdt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA); dt->base = vm->gdt; dt->limit = getpagesize(); @@ -562,7 +509,7 @@ static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp, int selector) { if (!vm->tss) - vm->tss = vm_vaddr_alloc_page(vm); + vm->tss = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA); memset(segp, 0, sizeof(*segp)); segp->base = vm->tss; @@ -605,38 +552,9 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) vcpu_sregs_set(vcpu, &sregs); } -void __vm_xsave_require_permission(int bit, const char *name) +void kvm_arch_vm_post_create(struct kvm_vm *vm) { - int kvm_fd; - u64 bitmask; - long rc; - struct kvm_device_attr attr = { - .group = 0, - .attr = KVM_X86_XCOMP_GUEST_SUPP, - .addr = (unsigned long) &bitmask - }; - - TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XFD)); - - kvm_fd = open_kvm_dev_path_or_exit(); - rc = __kvm_ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr); - close(kvm_fd); - - if (rc == -1 && (errno == ENXIO || errno == EINVAL)) - __TEST_REQUIRE(0, "KVM_X86_XCOMP_GUEST_SUPP not supported"); - - TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc); - - __TEST_REQUIRE(bitmask & (1ULL << bit), - "Required XSAVE feature '%s' not supported", name); - - TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit)); - - rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask); - TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc); - TEST_ASSERT(bitmask & (1ULL << bit), - "prctl(ARCH_REQ_XCOMP_GUEST_PERM) failure bitmask=0x%lx", - bitmask); + vm_create_irqchip(vm); } struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, @@ -647,8 +565,9 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, vm_vaddr_t stack_vaddr; struct kvm_vcpu *vcpu; - stack_vaddr = vm_vaddr_alloc(vm, DEFAULT_STACK_PGS * getpagesize(), - DEFAULT_GUEST_STACK_VADDR_MIN); + stack_vaddr = __vm_vaddr_alloc(vm, DEFAULT_STACK_PGS * getpagesize(), + DEFAULT_GUEST_STACK_VADDR_MIN, + MEM_REGION_DATA); vcpu = __vm_vcpu_add(vm, vcpu_id); vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid()); @@ -683,25 +602,29 @@ void vcpu_arch_free(struct kvm_vcpu *vcpu) free(vcpu->cpuid); } +/* Do not use kvm_supported_cpuid directly except for validity checks. */ +static void *kvm_supported_cpuid; + const struct kvm_cpuid2 *kvm_get_supported_cpuid(void) { - static struct kvm_cpuid2 *cpuid; int kvm_fd; - if (cpuid) - return cpuid; + if (kvm_supported_cpuid) + return kvm_supported_cpuid; - cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES); + kvm_supported_cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES); kvm_fd = open_kvm_dev_path_or_exit(); - kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID, cpuid); + kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID, + (struct kvm_cpuid2 *)kvm_supported_cpuid); close(kvm_fd); - return cpuid; + return kvm_supported_cpuid; } -bool kvm_cpuid_has(const struct kvm_cpuid2 *cpuid, - struct kvm_x86_cpu_feature feature) +static uint32_t __kvm_cpu_has(const struct kvm_cpuid2 *cpuid, + uint32_t function, uint32_t index, + uint8_t reg, uint8_t lo, uint8_t hi) { const struct kvm_cpuid_entry2 *entry; int i; @@ -714,12 +637,25 @@ bool kvm_cpuid_has(const struct kvm_cpuid2 *cpuid, * order, but kvm_x86_cpu_feature matches that mess, so yay * pointer shenanigans! */ - if (entry->function == feature.function && - entry->index == feature.index) - return (&entry->eax)[feature.reg] & BIT(feature.bit); + if (entry->function == function && entry->index == index) + return ((&entry->eax)[reg] & GENMASK(hi, lo)) >> lo; } - return false; + return 0; +} + +bool kvm_cpuid_has(const struct kvm_cpuid2 *cpuid, + struct kvm_x86_cpu_feature feature) +{ + return __kvm_cpu_has(cpuid, feature.function, feature.index, + feature.reg, feature.bit, feature.bit); +} + +uint32_t kvm_cpuid_property(const struct kvm_cpuid2 *cpuid, + struct kvm_x86_cpu_property property) +{ + return __kvm_cpu_has(cpuid, property.function, property.index, + property.reg, property.lo_bit, property.hi_bit); } uint64_t kvm_get_feature_msr(uint64_t msr_index) @@ -741,6 +677,41 @@ uint64_t kvm_get_feature_msr(uint64_t msr_index) return buffer.entry.data; } +void __vm_xsave_require_permission(int bit, const char *name) +{ + int kvm_fd; + u64 bitmask; + long rc; + struct kvm_device_attr attr = { + .group = 0, + .attr = KVM_X86_XCOMP_GUEST_SUPP, + .addr = (unsigned long) &bitmask + }; + + TEST_ASSERT(!kvm_supported_cpuid, + "kvm_get_supported_cpuid() cannot be used before ARCH_REQ_XCOMP_GUEST_PERM"); + + kvm_fd = open_kvm_dev_path_or_exit(); + rc = __kvm_ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr); + close(kvm_fd); + + if (rc == -1 && (errno == ENXIO || errno == EINVAL)) + __TEST_REQUIRE(0, "KVM_X86_XCOMP_GUEST_SUPP not supported"); + + TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc); + + __TEST_REQUIRE(bitmask & (1ULL << bit), + "Required XSAVE feature '%s' not supported", name); + + TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit)); + + rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask); + TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc); + TEST_ASSERT(bitmask & (1ULL << bit), + "prctl(ARCH_REQ_XCOMP_GUEST_PERM) failure bitmask=0x%lx", + bitmask); +} + void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid) { TEST_ASSERT(cpuid != vcpu->cpuid, "@cpuid can't be the vCPU's CPUID"); @@ -1059,18 +1030,12 @@ bool is_amd_cpu(void) void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits) { - const struct kvm_cpuid_entry2 *entry; - bool pae; - - /* SDM 4.1.4 */ - if (kvm_get_cpuid_max_extended() < 0x80000008) { - pae = kvm_get_supported_cpuid_entry(1)->edx & (1 << 6); - *pa_bits = pae ? 36 : 32; + if (!kvm_cpu_has_p(X86_PROPERTY_MAX_PHY_ADDR)) { + *pa_bits == kvm_cpu_has(X86_FEATURE_PAE) ? 36 : 32; *va_bits = 32; } else { - entry = kvm_get_supported_cpuid_entry(0x80000008); - *pa_bits = entry->eax & 0xff; - *va_bits = (entry->eax >> 8) & 0xff; + *pa_bits = kvm_cpu_property(X86_PROPERTY_MAX_PHY_ADDR); + *va_bits = kvm_cpu_property(X86_PROPERTY_MAX_VIRT_ADDR); } } @@ -1103,6 +1068,7 @@ static bool kvm_fixup_exception(struct ex_regs *regs) regs->rip = regs->r11; regs->r9 = regs->vector; + regs->r10 = regs->error_code; return true; } @@ -1132,8 +1098,8 @@ void vm_init_descriptor_tables(struct kvm_vm *vm) extern void *idt_handlers; int i; - vm->idt = vm_vaddr_alloc_page(vm); - vm->handlers = vm_vaddr_alloc_page(vm); + vm->idt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA); + vm->handlers = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA); /* Handlers have the same address in both address spaces.*/ for (i = 0; i < NUM_INTERRUPTS; i++) set_idt_entry(vm, i, (unsigned long)(&idt_handlers)[i], 0, @@ -1265,7 +1231,7 @@ unsigned long vm_compute_max_gfn(struct kvm_vm *vm) { const unsigned long num_ht_pages = 12 << (30 - vm->page_shift); /* 12 GiB */ unsigned long ht_gfn, max_gfn, max_pfn; - uint32_t eax, ebx, ecx, edx, max_ext_leaf; + uint8_t maxphyaddr; max_gfn = (1ULL << (vm->pa_bits - vm->page_shift)) - 1; @@ -1279,8 +1245,7 @@ unsigned long vm_compute_max_gfn(struct kvm_vm *vm) /* Before family 17h, the HyperTransport area is just below 1T. */ ht_gfn = (1 << 28) - num_ht_pages; - cpuid(1, &eax, &ebx, &ecx, &edx); - if (x86_family(eax) < 0x17) + if (this_cpu_family() < 0x17) goto done; /* @@ -1288,17 +1253,14 @@ unsigned long vm_compute_max_gfn(struct kvm_vm *vm) * reduced due to SME by bits 11:6 of CPUID[0x8000001f].EBX. Use * the old conservative value if MAXPHYADDR is not enumerated. */ - cpuid(0x80000000, &eax, &ebx, &ecx, &edx); - max_ext_leaf = eax; - if (max_ext_leaf < 0x80000008) + if (!this_cpu_has_p(X86_PROPERTY_MAX_PHY_ADDR)) goto done; - cpuid(0x80000008, &eax, &ebx, &ecx, &edx); - max_pfn = (1ULL << ((eax & 0xff) - vm->page_shift)) - 1; - if (max_ext_leaf >= 0x8000001f) { - cpuid(0x8000001f, &eax, &ebx, &ecx, &edx); - max_pfn >>= (ebx >> 6) & 0x3f; - } + maxphyaddr = this_cpu_property(X86_PROPERTY_MAX_PHY_ADDR); + max_pfn = (1ULL << (maxphyaddr - vm->page_shift)) - 1; + + if (this_cpu_has_p(X86_PROPERTY_PHYS_ADDR_REDUCTION)) + max_pfn >>= this_cpu_property(X86_PROPERTY_PHYS_ADDR_REDUCTION); ht_gfn = max_pfn - num_ht_pages; done: diff --git a/tools/testing/selftests/kvm/lib/x86_64/ucall.c b/tools/testing/selftests/kvm/lib/x86_64/ucall.c index e5f0f9e0d3ee..4d41dc63cc9e 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/ucall.c +++ b/tools/testing/selftests/kvm/lib/x86_64/ucall.c @@ -8,52 +8,25 @@ #define UCALL_PIO_PORT ((uint16_t)0x1000) -void ucall_init(struct kvm_vm *vm, void *arg) +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) { } -void ucall_uninit(struct kvm_vm *vm) +void ucall_arch_do_ucall(vm_vaddr_t uc) { -} - -void ucall(uint64_t cmd, int nargs, ...) -{ - struct ucall uc = { - .cmd = cmd, - }; - va_list va; - int i; - - nargs = min(nargs, UCALL_MAX_ARGS); - - va_start(va, nargs); - for (i = 0; i < nargs; ++i) - uc.args[i] = va_arg(va, uint64_t); - va_end(va); - asm volatile("in %[port], %%al" - : : [port] "d" (UCALL_PIO_PORT), "D" (&uc) : "rax", "memory"); + : : [port] "d" (UCALL_PIO_PORT), "D" (uc) : "rax", "memory"); } -uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc) +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; - struct ucall ucall = {}; - - if (uc) - memset(uc, 0, sizeof(*uc)); if (run->exit_reason == KVM_EXIT_IO && run->io.port == UCALL_PIO_PORT) { struct kvm_regs regs; vcpu_regs_get(vcpu, ®s); - memcpy(&ucall, addr_gva2hva(vcpu->vm, (vm_vaddr_t)regs.rdi), - sizeof(ucall)); - - vcpu_run_complete_io(vcpu); - if (uc) - memcpy(uc, &ucall, sizeof(ucall)); + return (void *)regs.rdi; } - - return ucall.cmd; + return NULL; } diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c b/tools/testing/selftests/kvm/lib/x86_64/vmx.c index d21049c38fc5..59d97531c9b1 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c +++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c @@ -109,18 +109,6 @@ vcpu_alloc_vmx(struct kvm_vm *vm, vm_vaddr_t *p_vmx_gva) vmx->vmwrite_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vmwrite); memset(vmx->vmwrite_hva, 0, getpagesize()); - /* Setup of a region of guest memory for the VP Assist page. */ - vmx->vp_assist = (void *)vm_vaddr_alloc_page(vm); - vmx->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)vmx->vp_assist); - vmx->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)vmx->vp_assist); - - /* Setup of a region of guest memory for the enlightened VMCS. */ - vmx->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm); - vmx->enlightened_vmcs_hva = - addr_gva2hva(vm, (uintptr_t)vmx->enlightened_vmcs); - vmx->enlightened_vmcs_gpa = - addr_gva2gpa(vm, (uintptr_t)vmx->enlightened_vmcs); - *p_vmx_gva = vmx_gva; return vmx; } @@ -171,26 +159,18 @@ bool prepare_for_vmx_operation(struct vmx_pages *vmx) bool load_vmcs(struct vmx_pages *vmx) { - if (!enable_evmcs) { - /* Load a VMCS. */ - *(uint32_t *)(vmx->vmcs) = vmcs_revision(); - if (vmclear(vmx->vmcs_gpa)) - return false; - - if (vmptrld(vmx->vmcs_gpa)) - return false; - - /* Setup shadow VMCS, do not load it yet. */ - *(uint32_t *)(vmx->shadow_vmcs) = - vmcs_revision() | 0x80000000ul; - if (vmclear(vmx->shadow_vmcs_gpa)) - return false; - } else { - if (evmcs_vmptrld(vmx->enlightened_vmcs_gpa, - vmx->enlightened_vmcs)) - return false; - current_evmcs->revision_id = EVMCS_VERSION; - } + /* Load a VMCS. */ + *(uint32_t *)(vmx->vmcs) = vmcs_revision(); + if (vmclear(vmx->vmcs_gpa)) + return false; + + if (vmptrld(vmx->vmcs_gpa)) + return false; + + /* Setup shadow VMCS, do not load it yet. */ + *(uint32_t *)(vmx->shadow_vmcs) = vmcs_revision() | 0x80000000ul; + if (vmclear(vmx->shadow_vmcs_gpa)) + return false; return true; } @@ -544,26 +524,22 @@ void nested_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm, __nested_map(vmx, vm, addr, addr, size, PG_LEVEL_1G); } -bool kvm_vm_has_ept(struct kvm_vm *vm) +bool kvm_cpu_has_ept(void) { - struct kvm_vcpu *vcpu; uint64_t ctrl; - vcpu = list_first_entry(&vm->vcpus, struct kvm_vcpu, list); - TEST_ASSERT(vcpu, "Cannot determine EPT support without vCPUs.\n"); - - ctrl = vcpu_get_msr(vcpu, MSR_IA32_VMX_TRUE_PROCBASED_CTLS) >> 32; + ctrl = kvm_get_feature_msr(MSR_IA32_VMX_TRUE_PROCBASED_CTLS) >> 32; if (!(ctrl & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS)) return false; - ctrl = vcpu_get_msr(vcpu, MSR_IA32_VMX_PROCBASED_CTLS2) >> 32; + ctrl = kvm_get_feature_msr(MSR_IA32_VMX_PROCBASED_CTLS2) >> 32; return ctrl & SECONDARY_EXEC_ENABLE_EPT; } void prepare_eptp(struct vmx_pages *vmx, struct kvm_vm *vm, uint32_t eptp_memslot) { - TEST_REQUIRE(kvm_vm_has_ept(vm)); + TEST_ASSERT(kvm_cpu_has_ept(), "KVM doesn't support nested EPT"); vmx->eptp = (void *)vm_vaddr_alloc_page(vm); vmx->eptp_hva = addr_gva2hva(vm, (uintptr_t)vmx->eptp); diff --git a/tools/testing/selftests/kvm/max_guest_memory_test.c b/tools/testing/selftests/kvm/max_guest_memory_test.c index 9a6e4f3ad6b5..feaf2be20ff2 100644 --- a/tools/testing/selftests/kvm/max_guest_memory_test.c +++ b/tools/testing/selftests/kvm/max_guest_memory_test.c @@ -11,6 +11,7 @@ #include <linux/bitmap.h> #include <linux/bitops.h> #include <linux/atomic.h> +#include <linux/sizes.h> #include "kvm_util.h" #include "test_util.h" @@ -162,8 +163,7 @@ int main(int argc, char *argv[]) * just below the 4gb boundary. This test could create memory at * 1gb-3gb,but it's simpler to skip straight to 4gb. */ - const uint64_t size_1gb = (1 << 30); - const uint64_t start_gpa = (4ull * size_1gb); + const uint64_t start_gpa = SZ_4G; const int first_slot = 1; struct timespec time_start, time_run1, time_reset, time_run2; @@ -180,29 +180,26 @@ int main(int argc, char *argv[]) * are quite common for x86, requires changing only max_mem (KVM allows * 32k memslots, 32k * 2gb == ~64tb of guest memory). */ - slot_size = 2 * size_1gb; + slot_size = SZ_2G; max_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS); TEST_ASSERT(max_slots > first_slot, "KVM is broken"); /* All KVM MMUs should be able to survive a 128gb guest. */ - max_mem = 128 * size_1gb; + max_mem = 128ull * SZ_1G; calc_default_nr_vcpus(); while ((opt = getopt(argc, argv, "c:h:m:s:H")) != -1) { switch (opt) { case 'c': - nr_vcpus = atoi(optarg); - TEST_ASSERT(nr_vcpus > 0, "number of vcpus must be >0"); + nr_vcpus = atoi_positive("Number of vCPUs", optarg); break; case 'm': - max_mem = atoi(optarg) * size_1gb; - TEST_ASSERT(max_mem > 0, "memory size must be >0"); + max_mem = 1ull * atoi_positive("Memory size", optarg) * SZ_1G; break; case 's': - slot_size = atoi(optarg) * size_1gb; - TEST_ASSERT(slot_size > 0, "slot size must be >0"); + slot_size = 1ull * atoi_positive("Slot size", optarg) * SZ_1G; break; case 'H': hugepages = true; @@ -245,7 +242,7 @@ int main(int argc, char *argv[]) #ifdef __x86_64__ /* Identity map memory in the guest using 1gb pages. */ - for (i = 0; i < slot_size; i += size_1gb) + for (i = 0; i < slot_size; i += SZ_1G) __virt_pg_map(vm, gpa + i, gpa + i, PG_LEVEL_1G); #else for (i = 0; i < slot_size; i += vm->page_size) @@ -260,7 +257,7 @@ int main(int argc, char *argv[]) vcpus = NULL; pr_info("Running with %lugb of guest memory and %u vCPUs\n", - (gpa - start_gpa) / size_1gb, nr_vcpus); + (gpa - start_gpa) / SZ_1G, nr_vcpus); rendezvous_with_vcpus(&time_start, "spawning"); rendezvous_with_vcpus(&time_run1, "run 1"); diff --git a/tools/testing/selftests/kvm/memslot_modification_stress_test.c b/tools/testing/selftests/kvm/memslot_modification_stress_test.c index bb1d17a1171b..9855c41ca811 100644 --- a/tools/testing/selftests/kvm/memslot_modification_stress_test.c +++ b/tools/testing/selftests/kvm/memslot_modification_stress_test.c @@ -21,7 +21,7 @@ #include <linux/bitops.h> #include <linux/userfaultfd.h> -#include "perf_test_util.h" +#include "memstress.h" #include "processor.h" #include "test_util.h" #include "guest_modes.h" @@ -34,9 +34,7 @@ static int nr_vcpus = 1; static uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE; -static bool run_vcpus = true; - -static void vcpu_worker(struct perf_test_vcpu_args *vcpu_args) +static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) { struct kvm_vcpu *vcpu = vcpu_args->vcpu; struct kvm_run *run; @@ -45,7 +43,7 @@ static void vcpu_worker(struct perf_test_vcpu_args *vcpu_args) run = vcpu->run; /* Let the guest access its memory until a stop signal is received */ - while (READ_ONCE(run_vcpus)) { + while (!READ_ONCE(memstress_args.stop_vcpus)) { ret = _vcpu_run(vcpu); TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); @@ -72,10 +70,10 @@ static void add_remove_memslot(struct kvm_vm *vm, useconds_t delay, int i; /* - * Add the dummy memslot just below the perf_test_util memslot, which is + * Add the dummy memslot just below the memstress memslot, which is * at the top of the guest physical address space. */ - gpa = perf_test_args.gpa - pages * vm->page_size; + gpa = memstress_args.gpa - pages * vm->page_size; for (i = 0; i < nr_modifications; i++) { usleep(delay); @@ -87,8 +85,8 @@ static void add_remove_memslot(struct kvm_vm *vm, useconds_t delay, } struct test_params { - useconds_t memslot_modification_delay; - uint64_t nr_memslot_modifications; + useconds_t delay; + uint64_t nr_iterations; bool partition_vcpu_memory_access; }; @@ -97,25 +95,22 @@ static void run_test(enum vm_guest_mode mode, void *arg) struct test_params *p = arg; struct kvm_vm *vm; - vm = perf_test_create_vm(mode, nr_vcpus, guest_percpu_mem_size, 1, + vm = memstress_create_vm(mode, nr_vcpus, guest_percpu_mem_size, 1, VM_MEM_SRC_ANONYMOUS, p->partition_vcpu_memory_access); pr_info("Finished creating vCPUs\n"); - perf_test_start_vcpu_threads(nr_vcpus, vcpu_worker); + memstress_start_vcpu_threads(nr_vcpus, vcpu_worker); pr_info("Started all vCPUs\n"); - add_remove_memslot(vm, p->memslot_modification_delay, - p->nr_memslot_modifications); - - run_vcpus = false; + add_remove_memslot(vm, p->delay, p->nr_iterations); - perf_test_join_vcpu_threads(nr_vcpus); + memstress_join_vcpu_threads(nr_vcpus); pr_info("All vCPU threads joined\n"); - perf_test_destroy_vm(vm); + memstress_destroy_vm(vm); } static void help(char *name) @@ -144,9 +139,8 @@ int main(int argc, char *argv[]) int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS); int opt; struct test_params p = { - .memslot_modification_delay = 0, - .nr_memslot_modifications = - DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS, + .delay = 0, + .nr_iterations = DEFAULT_MEMSLOT_MODIFICATION_ITERATIONS, .partition_vcpu_memory_access = true }; @@ -158,16 +152,14 @@ int main(int argc, char *argv[]) guest_modes_cmdline(optarg); break; case 'd': - p.memslot_modification_delay = strtoul(optarg, NULL, 0); - TEST_ASSERT(p.memslot_modification_delay >= 0, - "A negative delay is not supported."); + p.delay = atoi_non_negative("Delay", optarg); break; case 'b': guest_percpu_mem_size = parse_size(optarg); break; case 'v': - nr_vcpus = atoi(optarg); - TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus, + nr_vcpus = atoi_positive("Number of vCPUs", optarg); + TEST_ASSERT(nr_vcpus <= max_vcpus, "Invalid number of vcpus, must be between 1 and %d", max_vcpus); break; @@ -175,7 +167,7 @@ int main(int argc, char *argv[]) p.partition_vcpu_memory_access = false; break; case 'i': - p.nr_memslot_modifications = atoi(optarg); + p.nr_iterations = atoi_positive("Number of iterations", optarg); break; case 'h': default: diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index 44995446d942..e698306bf49d 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -20,20 +20,20 @@ #include <unistd.h> #include <linux/compiler.h> +#include <linux/sizes.h> #include <test_util.h> #include <kvm_util.h> #include <processor.h> -#define MEM_SIZE ((512U << 20) + 4096) -#define MEM_SIZE_PAGES (MEM_SIZE / 4096) -#define MEM_GPA 0x10000000UL +#define MEM_EXTRA_SIZE SZ_64K + +#define MEM_SIZE (SZ_512M + MEM_EXTRA_SIZE) +#define MEM_GPA SZ_256M #define MEM_AUX_GPA MEM_GPA #define MEM_SYNC_GPA MEM_AUX_GPA -#define MEM_TEST_GPA (MEM_AUX_GPA + 4096) -#define MEM_TEST_SIZE (MEM_SIZE - 4096) -static_assert(MEM_SIZE % 4096 == 0, "invalid mem size"); -static_assert(MEM_TEST_SIZE % 4096 == 0, "invalid mem test size"); +#define MEM_TEST_GPA (MEM_AUX_GPA + MEM_EXTRA_SIZE) +#define MEM_TEST_SIZE (MEM_SIZE - MEM_EXTRA_SIZE) /* * 32 MiB is max size that gets well over 100 iterations on 509 slots. @@ -41,44 +41,38 @@ static_assert(MEM_TEST_SIZE % 4096 == 0, "invalid mem test size"); * 8194 slots in use can then be tested (although with slightly * limited resolution). */ -#define MEM_SIZE_MAP ((32U << 20) + 4096) -#define MEM_SIZE_MAP_PAGES (MEM_SIZE_MAP / 4096) -#define MEM_TEST_MAP_SIZE (MEM_SIZE_MAP - 4096) -#define MEM_TEST_MAP_SIZE_PAGES (MEM_TEST_MAP_SIZE / 4096) -static_assert(MEM_SIZE_MAP % 4096 == 0, "invalid map test region size"); -static_assert(MEM_TEST_MAP_SIZE % 4096 == 0, "invalid map test region size"); -static_assert(MEM_TEST_MAP_SIZE_PAGES % 2 == 0, "invalid map test region size"); -static_assert(MEM_TEST_MAP_SIZE_PAGES > 2, "invalid map test region size"); +#define MEM_SIZE_MAP (SZ_32M + MEM_EXTRA_SIZE) +#define MEM_TEST_MAP_SIZE (MEM_SIZE_MAP - MEM_EXTRA_SIZE) /* * 128 MiB is min size that fills 32k slots with at least one page in each * while at the same time gets 100+ iterations in such test + * + * 2 MiB chunk size like a typical huge page */ -#define MEM_TEST_UNMAP_SIZE (128U << 20) -#define MEM_TEST_UNMAP_SIZE_PAGES (MEM_TEST_UNMAP_SIZE / 4096) -/* 2 MiB chunk size like a typical huge page */ -#define MEM_TEST_UNMAP_CHUNK_PAGES (2U << (20 - 12)) -static_assert(MEM_TEST_UNMAP_SIZE <= MEM_TEST_SIZE, - "invalid unmap test region size"); -static_assert(MEM_TEST_UNMAP_SIZE % 4096 == 0, - "invalid unmap test region size"); -static_assert(MEM_TEST_UNMAP_SIZE_PAGES % - (2 * MEM_TEST_UNMAP_CHUNK_PAGES) == 0, - "invalid unmap test region size"); +#define MEM_TEST_UNMAP_SIZE SZ_128M +#define MEM_TEST_UNMAP_CHUNK_SIZE SZ_2M /* * For the move active test the middle of the test area is placed on * a memslot boundary: half lies in the memslot being moved, half in * other memslot(s). * - * When running this test with 32k memslots (32764, really) each memslot - * contains 4 pages. - * The last one additionally contains the remaining 21 pages of memory, - * for the total size of 25 pages. - * Hence, the maximum size here is 50 pages. + * We have different number of memory slots, excluding the reserved + * memory slot 0, on various architectures and configurations. The + * memory size in this test is calculated by picking the maximal + * last memory slot's memory size, with alignment to the largest + * supported page size (64KB). In this way, the selected memory + * size for this test is compatible with test_memslot_move_prepare(). + * + * architecture slots memory-per-slot memory-on-last-slot + * -------------------------------------------------------------- + * x86-4KB 32763 16KB 160KB + * arm64-4KB 32766 16KB 112KB + * arm64-16KB 32766 16KB 112KB + * arm64-64KB 8192 64KB 128KB */ -#define MEM_TEST_MOVE_SIZE_PAGES (50) -#define MEM_TEST_MOVE_SIZE (MEM_TEST_MOVE_SIZE_PAGES * 4096) +#define MEM_TEST_MOVE_SIZE (3 * SZ_64K) #define MEM_TEST_MOVE_GPA_DEST (MEM_GPA + MEM_SIZE) static_assert(MEM_TEST_MOVE_SIZE <= MEM_TEST_SIZE, "invalid move test region size"); @@ -100,6 +94,7 @@ struct vm_data { }; struct sync_area { + uint32_t guest_page_size; atomic_bool start_flag; atomic_bool exit_flag; atomic_bool sync_flag; @@ -192,14 +187,15 @@ static void *vm_gpa2hva(struct vm_data *data, uint64_t gpa, uint64_t *rempages) uint64_t gpage, pgoffs; uint32_t slot, slotoffs; void *base; + uint32_t guest_page_size = data->vm->page_size; TEST_ASSERT(gpa >= MEM_GPA, "Too low gpa to translate"); - TEST_ASSERT(gpa < MEM_GPA + data->npages * 4096, + TEST_ASSERT(gpa < MEM_GPA + data->npages * guest_page_size, "Too high gpa to translate"); gpa -= MEM_GPA; - gpage = gpa / 4096; - pgoffs = gpa % 4096; + gpage = gpa / guest_page_size; + pgoffs = gpa % guest_page_size; slot = min(gpage / data->pages_per_slot, (uint64_t)data->nslots - 1); slotoffs = gpage - (slot * data->pages_per_slot); @@ -217,14 +213,16 @@ static void *vm_gpa2hva(struct vm_data *data, uint64_t gpa, uint64_t *rempages) } base = data->hva_slots[slot]; - return (uint8_t *)base + slotoffs * 4096 + pgoffs; + return (uint8_t *)base + slotoffs * guest_page_size + pgoffs; } static uint64_t vm_slot2gpa(struct vm_data *data, uint32_t slot) { + uint32_t guest_page_size = data->vm->page_size; + TEST_ASSERT(slot < data->nslots, "Too high slot number"); - return MEM_GPA + slot * data->pages_per_slot * 4096; + return MEM_GPA + slot * data->pages_per_slot * guest_page_size; } static struct vm_data *alloc_vm(void) @@ -241,82 +239,111 @@ static struct vm_data *alloc_vm(void) return data; } +static bool check_slot_pages(uint32_t host_page_size, uint32_t guest_page_size, + uint64_t pages_per_slot, uint64_t rempages) +{ + if (!pages_per_slot) + return false; + + if ((pages_per_slot * guest_page_size) % host_page_size) + return false; + + if ((rempages * guest_page_size) % host_page_size) + return false; + + return true; +} + + +static uint64_t get_max_slots(struct vm_data *data, uint32_t host_page_size) +{ + uint32_t guest_page_size = data->vm->page_size; + uint64_t mempages, pages_per_slot, rempages; + uint64_t slots; + + mempages = data->npages; + slots = data->nslots; + while (--slots > 1) { + pages_per_slot = mempages / slots; + rempages = mempages % pages_per_slot; + if (check_slot_pages(host_page_size, guest_page_size, + pages_per_slot, rempages)) + return slots + 1; /* slot 0 is reserved */ + } + + return 0; +} + static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, - void *guest_code, uint64_t mempages, + void *guest_code, uint64_t mem_size, struct timespec *slot_runtime) { - uint32_t max_mem_slots; - uint64_t rempages; + uint64_t mempages, rempages; uint64_t guest_addr; - uint32_t slot; + uint32_t slot, host_page_size, guest_page_size; struct timespec tstart; struct sync_area *sync; - max_mem_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS); - TEST_ASSERT(max_mem_slots > 1, - "KVM_CAP_NR_MEMSLOTS should be greater than 1"); - TEST_ASSERT(nslots > 1 || nslots == -1, - "Slot count cap should be greater than 1"); - if (nslots != -1) - max_mem_slots = min(max_mem_slots, (uint32_t)nslots); - pr_info_v("Allowed number of memory slots: %"PRIu32"\n", max_mem_slots); + host_page_size = getpagesize(); + guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; + mempages = mem_size / guest_page_size; - TEST_ASSERT(mempages > 1, - "Can't test without any memory"); + data->vm = __vm_create_with_one_vcpu(&data->vcpu, mempages, guest_code); + TEST_ASSERT(data->vm->page_size == guest_page_size, "Invalid VM page size"); data->npages = mempages; - data->nslots = max_mem_slots - 1; - data->pages_per_slot = mempages / data->nslots; - if (!data->pages_per_slot) { - *maxslots = mempages + 1; + TEST_ASSERT(data->npages > 1, "Can't test without any memory"); + data->nslots = nslots; + data->pages_per_slot = data->npages / data->nslots; + rempages = data->npages % data->nslots; + if (!check_slot_pages(host_page_size, guest_page_size, + data->pages_per_slot, rempages)) { + *maxslots = get_max_slots(data, host_page_size); return false; } - rempages = mempages % data->nslots; data->hva_slots = malloc(sizeof(*data->hva_slots) * data->nslots); TEST_ASSERT(data->hva_slots, "malloc() fail"); data->vm = __vm_create_with_one_vcpu(&data->vcpu, mempages, guest_code); - ucall_init(data->vm, NULL); pr_info_v("Adding slots 1..%i, each slot with %"PRIu64" pages + %"PRIu64" extra pages last\n", - max_mem_slots - 1, data->pages_per_slot, rempages); + data->nslots, data->pages_per_slot, rempages); clock_gettime(CLOCK_MONOTONIC, &tstart); - for (slot = 1, guest_addr = MEM_GPA; slot < max_mem_slots; slot++) { + for (slot = 1, guest_addr = MEM_GPA; slot <= data->nslots; slot++) { uint64_t npages; npages = data->pages_per_slot; - if (slot == max_mem_slots - 1) + if (slot == data->nslots) npages += rempages; vm_userspace_mem_region_add(data->vm, VM_MEM_SRC_ANONYMOUS, guest_addr, slot, npages, 0); - guest_addr += npages * 4096; + guest_addr += npages * guest_page_size; } *slot_runtime = timespec_elapsed(tstart); - for (slot = 0, guest_addr = MEM_GPA; slot < max_mem_slots - 1; slot++) { + for (slot = 1, guest_addr = MEM_GPA; slot <= data->nslots; slot++) { uint64_t npages; uint64_t gpa; npages = data->pages_per_slot; - if (slot == max_mem_slots - 2) + if (slot == data->nslots) npages += rempages; - gpa = vm_phy_pages_alloc(data->vm, npages, guest_addr, - slot + 1); + gpa = vm_phy_pages_alloc(data->vm, npages, guest_addr, slot); TEST_ASSERT(gpa == guest_addr, "vm_phy_pages_alloc() failed\n"); - data->hva_slots[slot] = addr_gpa2hva(data->vm, guest_addr); - memset(data->hva_slots[slot], 0, npages * 4096); + data->hva_slots[slot - 1] = addr_gpa2hva(data->vm, guest_addr); + memset(data->hva_slots[slot - 1], 0, npages * guest_page_size); - guest_addr += npages * 4096; + guest_addr += npages * guest_page_size; } - virt_map(data->vm, MEM_GPA, MEM_GPA, mempages); + virt_map(data->vm, MEM_GPA, MEM_GPA, data->npages); sync = (typeof(sync))vm_gpa2hva(data, MEM_SYNC_GPA, NULL); atomic_init(&sync->start_flag, false); @@ -415,6 +442,7 @@ static bool guest_perform_sync(void) static void guest_code_test_memslot_move(void) { struct sync_area *sync = (typeof(sync))MEM_SYNC_GPA; + uint32_t page_size = (typeof(page_size))READ_ONCE(sync->guest_page_size); uintptr_t base = (typeof(base))READ_ONCE(sync->move_area_ptr); GUEST_SYNC(0); @@ -425,7 +453,7 @@ static void guest_code_test_memslot_move(void) uintptr_t ptr; for (ptr = base; ptr < base + MEM_TEST_MOVE_SIZE; - ptr += 4096) + ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_1; /* @@ -443,6 +471,7 @@ static void guest_code_test_memslot_move(void) static void guest_code_test_memslot_map(void) { struct sync_area *sync = (typeof(sync))MEM_SYNC_GPA; + uint32_t page_size = (typeof(page_size))READ_ONCE(sync->guest_page_size); GUEST_SYNC(0); @@ -452,14 +481,16 @@ static void guest_code_test_memslot_map(void) uintptr_t ptr; for (ptr = MEM_TEST_GPA; - ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE / 2; ptr += 4096) + ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE / 2; + ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_1; if (!guest_perform_sync()) break; for (ptr = MEM_TEST_GPA + MEM_TEST_MAP_SIZE / 2; - ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE; ptr += 4096) + ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE; + ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_2; if (!guest_perform_sync()) @@ -506,6 +537,9 @@ static void guest_code_test_memslot_unmap(void) static void guest_code_test_memslot_rw(void) { + struct sync_area *sync = (typeof(sync))MEM_SYNC_GPA; + uint32_t page_size = (typeof(page_size))READ_ONCE(sync->guest_page_size); + GUEST_SYNC(0); guest_spin_until_start(); @@ -514,14 +548,14 @@ static void guest_code_test_memslot_rw(void) uintptr_t ptr; for (ptr = MEM_TEST_GPA; - ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += 4096) + ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_1; if (!guest_perform_sync()) break; - for (ptr = MEM_TEST_GPA + 4096 / 2; - ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += 4096) { + for (ptr = MEM_TEST_GPA + page_size / 2; + ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += page_size) { uint64_t val = *(uint64_t *)ptr; GUEST_ASSERT_1(val == MEM_TEST_VAL_2, val); @@ -539,6 +573,7 @@ static bool test_memslot_move_prepare(struct vm_data *data, struct sync_area *sync, uint64_t *maxslots, bool isactive) { + uint32_t guest_page_size = data->vm->page_size; uint64_t movesrcgpa, movetestgpa; movesrcgpa = vm_slot2gpa(data, data->nslots - 1); @@ -547,7 +582,7 @@ static bool test_memslot_move_prepare(struct vm_data *data, uint64_t lastpages; vm_gpa2hva(data, movesrcgpa, &lastpages); - if (lastpages < MEM_TEST_MOVE_SIZE_PAGES / 2) { + if (lastpages * guest_page_size < MEM_TEST_MOVE_SIZE / 2) { *maxslots = 0; return false; } @@ -593,8 +628,9 @@ static void test_memslot_do_unmap(struct vm_data *data, uint64_t offsp, uint64_t count) { uint64_t gpa, ctr; + uint32_t guest_page_size = data->vm->page_size; - for (gpa = MEM_TEST_GPA + offsp * 4096, ctr = 0; ctr < count; ) { + for (gpa = MEM_TEST_GPA + offsp * guest_page_size, ctr = 0; ctr < count; ) { uint64_t npages; void *hva; int ret; @@ -602,12 +638,12 @@ static void test_memslot_do_unmap(struct vm_data *data, hva = vm_gpa2hva(data, gpa, &npages); TEST_ASSERT(npages, "Empty memory slot at gptr 0x%"PRIx64, gpa); npages = min(npages, count - ctr); - ret = madvise(hva, npages * 4096, MADV_DONTNEED); + ret = madvise(hva, npages * guest_page_size, MADV_DONTNEED); TEST_ASSERT(!ret, "madvise(%p, MADV_DONTNEED) on VM memory should not fail for gptr 0x%"PRIx64, hva, gpa); ctr += npages; - gpa += npages * 4096; + gpa += npages * guest_page_size; } TEST_ASSERT(ctr == count, "madvise(MADV_DONTNEED) should exactly cover all of the requested area"); @@ -618,11 +654,12 @@ static void test_memslot_map_unmap_check(struct vm_data *data, { uint64_t gpa; uint64_t *val; + uint32_t guest_page_size = data->vm->page_size; if (!map_unmap_verify) return; - gpa = MEM_TEST_GPA + offsp * 4096; + gpa = MEM_TEST_GPA + offsp * guest_page_size; val = (typeof(val))vm_gpa2hva(data, gpa, NULL); TEST_ASSERT(*val == valexp, "Guest written values should read back correctly before unmap (%"PRIu64" vs %"PRIu64" @ %"PRIx64")", @@ -632,12 +669,14 @@ static void test_memslot_map_unmap_check(struct vm_data *data, static void test_memslot_map_loop(struct vm_data *data, struct sync_area *sync) { + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_pages = MEM_TEST_MAP_SIZE / guest_page_size; + /* * Unmap the second half of the test area while guest writes to (maps) * the first half. */ - test_memslot_do_unmap(data, MEM_TEST_MAP_SIZE_PAGES / 2, - MEM_TEST_MAP_SIZE_PAGES / 2); + test_memslot_do_unmap(data, guest_pages / 2, guest_pages / 2); /* * Wait for the guest to finish writing the first half of the test @@ -648,10 +687,8 @@ static void test_memslot_map_loop(struct vm_data *data, struct sync_area *sync) */ host_perform_sync(sync); test_memslot_map_unmap_check(data, 0, MEM_TEST_VAL_1); - test_memslot_map_unmap_check(data, - MEM_TEST_MAP_SIZE_PAGES / 2 - 1, - MEM_TEST_VAL_1); - test_memslot_do_unmap(data, 0, MEM_TEST_MAP_SIZE_PAGES / 2); + test_memslot_map_unmap_check(data, guest_pages / 2 - 1, MEM_TEST_VAL_1); + test_memslot_do_unmap(data, 0, guest_pages / 2); /* @@ -664,16 +701,16 @@ static void test_memslot_map_loop(struct vm_data *data, struct sync_area *sync) * the test area. */ host_perform_sync(sync); - test_memslot_map_unmap_check(data, MEM_TEST_MAP_SIZE_PAGES / 2, - MEM_TEST_VAL_2); - test_memslot_map_unmap_check(data, MEM_TEST_MAP_SIZE_PAGES - 1, - MEM_TEST_VAL_2); + test_memslot_map_unmap_check(data, guest_pages / 2, MEM_TEST_VAL_2); + test_memslot_map_unmap_check(data, guest_pages - 1, MEM_TEST_VAL_2); } static void test_memslot_unmap_loop_common(struct vm_data *data, struct sync_area *sync, uint64_t chunk) { + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_pages = MEM_TEST_UNMAP_SIZE / guest_page_size; uint64_t ctr; /* @@ -685,42 +722,49 @@ static void test_memslot_unmap_loop_common(struct vm_data *data, */ host_perform_sync(sync); test_memslot_map_unmap_check(data, 0, MEM_TEST_VAL_1); - for (ctr = 0; ctr < MEM_TEST_UNMAP_SIZE_PAGES / 2; ctr += chunk) + for (ctr = 0; ctr < guest_pages / 2; ctr += chunk) test_memslot_do_unmap(data, ctr, chunk); /* Likewise, but for the opposite host / guest areas */ host_perform_sync(sync); - test_memslot_map_unmap_check(data, MEM_TEST_UNMAP_SIZE_PAGES / 2, - MEM_TEST_VAL_2); - for (ctr = MEM_TEST_UNMAP_SIZE_PAGES / 2; - ctr < MEM_TEST_UNMAP_SIZE_PAGES; ctr += chunk) + test_memslot_map_unmap_check(data, guest_pages / 2, MEM_TEST_VAL_2); + for (ctr = guest_pages / 2; ctr < guest_pages; ctr += chunk) test_memslot_do_unmap(data, ctr, chunk); } static void test_memslot_unmap_loop(struct vm_data *data, struct sync_area *sync) { - test_memslot_unmap_loop_common(data, sync, 1); + uint32_t host_page_size = getpagesize(); + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_chunk_pages = guest_page_size >= host_page_size ? + 1 : host_page_size / guest_page_size; + + test_memslot_unmap_loop_common(data, sync, guest_chunk_pages); } static void test_memslot_unmap_loop_chunked(struct vm_data *data, struct sync_area *sync) { - test_memslot_unmap_loop_common(data, sync, MEM_TEST_UNMAP_CHUNK_PAGES); + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_chunk_pages = MEM_TEST_UNMAP_CHUNK_SIZE / guest_page_size; + + test_memslot_unmap_loop_common(data, sync, guest_chunk_pages); } static void test_memslot_rw_loop(struct vm_data *data, struct sync_area *sync) { uint64_t gptr; + uint32_t guest_page_size = data->vm->page_size; - for (gptr = MEM_TEST_GPA + 4096 / 2; - gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += 4096) + for (gptr = MEM_TEST_GPA + guest_page_size / 2; + gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += guest_page_size) *(uint64_t *)vm_gpa2hva(data, gptr, NULL) = MEM_TEST_VAL_2; host_perform_sync(sync); for (gptr = MEM_TEST_GPA; - gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += 4096) { + gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += guest_page_size) { uint64_t *vptr = (typeof(vptr))vm_gpa2hva(data, gptr, NULL); uint64_t val = *vptr; @@ -749,7 +793,7 @@ static bool test_execute(int nslots, uint64_t *maxslots, struct timespec *slot_runtime, struct timespec *guest_runtime) { - uint64_t mem_size = tdata->mem_size ? : MEM_SIZE_PAGES; + uint64_t mem_size = tdata->mem_size ? : MEM_SIZE; struct vm_data *data; struct sync_area *sync; struct timespec tstart; @@ -764,6 +808,7 @@ static bool test_execute(int nslots, uint64_t *maxslots, sync = (typeof(sync))vm_gpa2hva(data, MEM_SYNC_GPA, NULL); + sync->guest_page_size = data->vm->page_size; if (tdata->prepare && !tdata->prepare(data, sync, maxslots)) { ret = false; @@ -797,19 +842,19 @@ exit_free: static const struct test_data tests[] = { { .name = "map", - .mem_size = MEM_SIZE_MAP_PAGES, + .mem_size = MEM_SIZE_MAP, .guest_code = guest_code_test_memslot_map, .loop = test_memslot_map_loop, }, { .name = "unmap", - .mem_size = MEM_TEST_UNMAP_SIZE_PAGES + 1, + .mem_size = MEM_TEST_UNMAP_SIZE + MEM_EXTRA_SIZE, .guest_code = guest_code_test_memslot_unmap, .loop = test_memslot_unmap_loop, }, { .name = "unmap chunked", - .mem_size = MEM_TEST_UNMAP_SIZE_PAGES + 1, + .mem_size = MEM_TEST_UNMAP_SIZE + MEM_EXTRA_SIZE, .guest_code = guest_code_test_memslot_unmap, .loop = test_memslot_unmap_loop_chunked, }, @@ -867,9 +912,46 @@ static void help(char *name, struct test_args *targs) pr_info("%d: %s\n", ctr, tests[ctr].name); } +static bool check_memory_sizes(void) +{ + uint32_t host_page_size = getpagesize(); + uint32_t guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; + + if (host_page_size > SZ_64K || guest_page_size > SZ_64K) { + pr_info("Unsupported page size on host (0x%x) or guest (0x%x)\n", + host_page_size, guest_page_size); + return false; + } + + if (MEM_SIZE % guest_page_size || + MEM_TEST_SIZE % guest_page_size) { + pr_info("invalid MEM_SIZE or MEM_TEST_SIZE\n"); + return false; + } + + if (MEM_SIZE_MAP % guest_page_size || + MEM_TEST_MAP_SIZE % guest_page_size || + (MEM_TEST_MAP_SIZE / guest_page_size) <= 2 || + (MEM_TEST_MAP_SIZE / guest_page_size) % 2) { + pr_info("invalid MEM_SIZE_MAP or MEM_TEST_MAP_SIZE\n"); + return false; + } + + if (MEM_TEST_UNMAP_SIZE > MEM_TEST_SIZE || + MEM_TEST_UNMAP_SIZE % guest_page_size || + (MEM_TEST_UNMAP_SIZE / guest_page_size) % + (2 * MEM_TEST_UNMAP_CHUNK_SIZE / guest_page_size)) { + pr_info("invalid MEM_TEST_UNMAP_SIZE or MEM_TEST_UNMAP_CHUNK_SIZE\n"); + return false; + } + + return true; +} + static bool parse_args(int argc, char *argv[], struct test_args *targs) { + uint32_t max_mem_slots; int opt; while ((opt = getopt(argc, argv, "hvds:f:e:l:r:")) != -1) { @@ -885,40 +967,28 @@ static bool parse_args(int argc, char *argv[], map_unmap_verify = true; break; case 's': - targs->nslots = atoi(optarg); - if (targs->nslots <= 0 && targs->nslots != -1) { - pr_info("Slot count cap has to be positive or -1 for no cap\n"); + targs->nslots = atoi_paranoid(optarg); + if (targs->nslots <= 1 && targs->nslots != -1) { + pr_info("Slot count cap must be larger than 1 or -1 for no cap\n"); return false; } break; case 'f': - targs->tfirst = atoi(optarg); - if (targs->tfirst < 0) { - pr_info("First test to run has to be non-negative\n"); - return false; - } + targs->tfirst = atoi_non_negative("First test", optarg); break; case 'e': - targs->tlast = atoi(optarg); - if (targs->tlast < 0 || targs->tlast >= NTESTS) { + targs->tlast = atoi_non_negative("Last test", optarg); + if (targs->tlast >= NTESTS) { pr_info("Last test to run has to be non-negative and less than %zu\n", NTESTS); return false; } break; case 'l': - targs->seconds = atoi(optarg); - if (targs->seconds < 0) { - pr_info("Test length in seconds has to be non-negative\n"); - return false; - } + targs->seconds = atoi_non_negative("Test length", optarg); break; case 'r': - targs->runs = atoi(optarg); - if (targs->runs <= 0) { - pr_info("Runs per test has to be positive\n"); - return false; - } + targs->runs = atoi_positive("Runs per test", optarg); break; } } @@ -933,6 +1003,21 @@ static bool parse_args(int argc, char *argv[], return false; } + max_mem_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS); + if (max_mem_slots <= 1) { + pr_info("KVM_CAP_NR_MEMSLOTS should be greater than 1\n"); + return false; + } + + /* Memory slot 0 is reserved */ + if (targs->nslots == -1) + targs->nslots = max_mem_slots - 1; + else + targs->nslots = min_t(int, targs->nslots, max_mem_slots) - 1; + + pr_info_v("Allowed Number of memory slots: %"PRIu32"\n", + targs->nslots + 1); + return true; } @@ -1007,8 +1092,8 @@ int main(int argc, char *argv[]) struct test_result rbestslottime; int tctr; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); + if (!check_memory_sizes()) + return -1; if (!parse_args(argc, argv, &targs)) return -1; diff --git a/tools/testing/selftests/kvm/rseq_test.c b/tools/testing/selftests/kvm/rseq_test.c index 6f88da7e60be..3045fdf9bdf5 100644 --- a/tools/testing/selftests/kvm/rseq_test.c +++ b/tools/testing/selftests/kvm/rseq_test.c @@ -205,9 +205,6 @@ int main(int argc, char *argv[]) struct kvm_vcpu *vcpu; u32 cpu, rseq_cpu; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - r = sched_getaffinity(0, sizeof(possible_mask), &possible_mask); TEST_ASSERT(!r, "sched_getaffinity failed, errno = %d (%s)", errno, strerror(errno)); @@ -224,7 +221,6 @@ int main(int argc, char *argv[]) * CPU affinity. */ vm = vm_create_with_one_vcpu(&vcpu, guest_code); - ucall_init(vm, NULL); pthread_create(&migration_thread, NULL, migration_worker, (void *)(unsigned long)syscall(SYS_gettid)); diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c index 9113696d5178..3fd81e58f40c 100644 --- a/tools/testing/selftests/kvm/s390x/memop.c +++ b/tools/testing/selftests/kvm/s390x/memop.c @@ -760,8 +760,6 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_MEM_OP)); - setbuf(stdout, NULL); /* Tell stdout not to buffer its content */ - ksft_print_header(); ksft_set_plan(ARRAY_SIZE(testlist)); diff --git a/tools/testing/selftests/kvm/s390x/resets.c b/tools/testing/selftests/kvm/s390x/resets.c index 19486084eb30..e41e2cb8ffa9 100644 --- a/tools/testing/selftests/kvm/s390x/resets.c +++ b/tools/testing/selftests/kvm/s390x/resets.c @@ -296,8 +296,6 @@ int main(int argc, char *argv[]) bool has_s390_vcpu_resets = kvm_check_cap(KVM_CAP_S390_VCPU_RESETS); int idx; - setbuf(stdout, NULL); /* Tell stdout not to buffer its content */ - ksft_print_header(); ksft_set_plan(ARRAY_SIZE(testlist)); diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c index 3fdb6e2598eb..2ddde41c44ba 100644 --- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c +++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c @@ -231,9 +231,6 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_has_cap(KVM_CAP_SYNC_REGS)); - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - ksft_print_header(); ksft_set_plan(ARRAY_SIZE(testlist)); diff --git a/tools/testing/selftests/kvm/set_memory_region_test.c b/tools/testing/selftests/kvm/set_memory_region_test.c index 0d55f508d595..2ef1d1b72ce4 100644 --- a/tools/testing/selftests/kvm/set_memory_region_test.c +++ b/tools/testing/selftests/kvm/set_memory_region_test.c @@ -392,9 +392,6 @@ int main(int argc, char *argv[]) int i, loops; #endif - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - #ifdef __x86_64__ /* * FIXME: the zero-memslot test fails on aarch64 and s390x because @@ -407,7 +404,7 @@ int main(int argc, char *argv[]) #ifdef __x86_64__ if (argc > 1) - loops = atoi(argv[1]); + loops = atoi_positive("Number of iterations", argv[1]); else loops = 10; diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c index db8967f1a17b..c87f38712073 100644 --- a/tools/testing/selftests/kvm/steal_time.c +++ b/tools/testing/selftests/kvm/steal_time.c @@ -266,7 +266,6 @@ int main(int ac, char **av) gpages = vm_calc_num_guest_pages(VM_MODE_DEFAULT, STEAL_TIME_SIZE * NR_VCPUS); vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, ST_GPA_BASE, 1, gpages, 0); virt_map(vm, ST_GPA_BASE, ST_GPA_BASE, gpages); - ucall_init(vm, NULL); TEST_REQUIRE(is_steal_time_supported(vcpus[0])); diff --git a/tools/testing/selftests/kvm/system_counter_offset_test.c b/tools/testing/selftests/kvm/system_counter_offset_test.c index 1c274933912b..7f5b330b6a1b 100644 --- a/tools/testing/selftests/kvm/system_counter_offset_test.c +++ b/tools/testing/selftests/kvm/system_counter_offset_test.c @@ -121,7 +121,6 @@ int main(void) vm = vm_create_with_one_vcpu(&vcpu, guest_main); check_preconditions(vcpu); - ucall_init(vm, NULL); enter_guest(vcpu); kvm_vm_free(vm); diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c index dadcbad10a1d..bd72c6eb3b67 100644 --- a/tools/testing/selftests/kvm/x86_64/amx_test.c +++ b/tools/testing/selftests/kvm/x86_64/amx_test.c @@ -39,11 +39,6 @@ #define XFEATURE_MASK_XTILEDATA (1 << XFEATURE_XTILEDATA) #define XFEATURE_MASK_XTILE (XFEATURE_MASK_XTILECFG | XFEATURE_MASK_XTILEDATA) -#define TILE_CPUID 0x1d -#define XSTATE_CPUID 0xd -#define TILE_PALETTE_CPUID_SUBLEAVE 0x1 -#define XSTATE_USER_STATE_SUBLEAVE 0x0 - #define XSAVE_HDR_OFFSET 512 struct xsave_data { @@ -129,71 +124,26 @@ static bool check_xsave_supports_xtile(void) return __xgetbv(0) & XFEATURE_MASK_XTILE; } -static bool enum_xtile_config(void) +static void check_xtile_info(void) { - u32 eax, ebx, ecx, edx; - - __cpuid(TILE_CPUID, TILE_PALETTE_CPUID_SUBLEAVE, &eax, &ebx, &ecx, &edx); - if (!eax || !ebx || !ecx) - return false; - - xtile.max_names = ebx >> 16; - if (xtile.max_names < NUM_TILES) - return false; - - xtile.bytes_per_tile = eax >> 16; - if (xtile.bytes_per_tile < TILE_SIZE) - return false; - - xtile.bytes_per_row = ebx; - xtile.max_rows = ecx; - - return true; -} - -static bool enum_xsave_tile(void) -{ - u32 eax, ebx, ecx, edx; - - __cpuid(XSTATE_CPUID, XFEATURE_XTILEDATA, &eax, &ebx, &ecx, &edx); - if (!eax || !ebx) - return false; - - xtile.xsave_offset = ebx; - xtile.xsave_size = eax; - - return true; -} - -static bool check_xsave_size(void) -{ - u32 eax, ebx, ecx, edx; - bool valid = false; - - __cpuid(XSTATE_CPUID, XSTATE_USER_STATE_SUBLEAVE, &eax, &ebx, &ecx, &edx); - if (ebx && ebx <= XSAVE_SIZE) - valid = true; - - return valid; -} - -static bool check_xtile_info(void) -{ - bool ret = false; - - if (!check_xsave_size()) - return ret; + GUEST_ASSERT(this_cpu_has_p(X86_PROPERTY_XSTATE_MAX_SIZE_XCR0)); + GUEST_ASSERT(this_cpu_property(X86_PROPERTY_XSTATE_MAX_SIZE_XCR0) <= XSAVE_SIZE); - if (!enum_xsave_tile()) - return ret; - - if (!enum_xtile_config()) - return ret; - - if (sizeof(struct tile_data) >= xtile.xsave_size) - ret = true; + xtile.xsave_offset = this_cpu_property(X86_PROPERTY_XSTATE_TILE_OFFSET); + GUEST_ASSERT(xtile.xsave_offset == 2816); + xtile.xsave_size = this_cpu_property(X86_PROPERTY_XSTATE_TILE_SIZE); + GUEST_ASSERT(xtile.xsave_size == 8192); + GUEST_ASSERT(sizeof(struct tile_data) >= xtile.xsave_size); - return ret; + GUEST_ASSERT(this_cpu_has_p(X86_PROPERTY_AMX_NR_TILE_REGS)); + xtile.max_names = this_cpu_property(X86_PROPERTY_AMX_NR_TILE_REGS); + GUEST_ASSERT(xtile.max_names == 8); + xtile.bytes_per_tile = this_cpu_property(X86_PROPERTY_AMX_BYTES_PER_TILE); + GUEST_ASSERT(xtile.bytes_per_tile == 1024); + xtile.bytes_per_row = this_cpu_property(X86_PROPERTY_AMX_BYTES_PER_ROW); + GUEST_ASSERT(xtile.bytes_per_row == 64); + xtile.max_rows = this_cpu_property(X86_PROPERTY_AMX_MAX_ROWS); + GUEST_ASSERT(xtile.max_rows == 16); } static void set_tilecfg(struct tile_config *cfg) @@ -238,16 +188,8 @@ static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg, { init_regs(); check_cpuid_xsave(); - GUEST_ASSERT(check_xsave_supports_xtile()); - GUEST_ASSERT(check_xtile_info()); - - /* check xtile configs */ - GUEST_ASSERT(xtile.xsave_offset == 2816); - GUEST_ASSERT(xtile.xsave_size == 8192); - GUEST_ASSERT(xtile.max_names == 8); - GUEST_ASSERT(xtile.bytes_per_tile == 1024); - GUEST_ASSERT(xtile.bytes_per_row == 64); - GUEST_ASSERT(xtile.max_rows == 16); + check_xsave_supports_xtile(); + check_xtile_info(); GUEST_SYNC(1); /* xfd=0, enable amx */ @@ -307,18 +249,24 @@ int main(int argc, char *argv[]) u32 amx_offset; int stage, ret; + /* + * Note, all off-by-default features must be enabled before anything + * caches KVM_GET_SUPPORTED_CPUID, e.g. before using kvm_cpu_has(). + */ vm_xsave_require_permission(XSTATE_XTILE_DATA_BIT); - /* Create VM */ - vm = vm_create_with_one_vcpu(&vcpu, guest_code); - + TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XFD)); TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XSAVE)); TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_AMX_TILE)); TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XTILECFG)); TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XTILEDATA)); - /* Get xsave/restore max size */ - xsave_restore_size = kvm_get_supported_cpuid_entry(0xd)->ecx; + /* Create VM */ + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + + TEST_ASSERT(kvm_cpu_has_p(X86_PROPERTY_XSTATE_MAX_SIZE), + "KVM should enumerate max XSAVE size when XSAVE is supported"); + xsave_restore_size = kvm_cpu_property(X86_PROPERTY_XSTATE_MAX_SIZE); run = vcpu->run; vcpu_regs_get(vcpu, ®s1); diff --git a/tools/testing/selftests/kvm/x86_64/cpuid_test.c b/tools/testing/selftests/kvm/x86_64/cpuid_test.c index a6aeee2e62e4..2fc3ad9c887e 100644 --- a/tools/testing/selftests/kvm/x86_64/cpuid_test.c +++ b/tools/testing/selftests/kvm/x86_64/cpuid_test.c @@ -43,15 +43,6 @@ static void test_guest_cpuids(struct kvm_cpuid2 *guest_cpuid) } -static void test_cpuid_40000000(struct kvm_cpuid2 *guest_cpuid) -{ - u32 eax, ebx, ecx, edx; - - cpuid(0x40000000, &eax, &ebx, &ecx, &edx); - - GUEST_ASSERT(eax == 0x40000001); -} - static void guest_main(struct kvm_cpuid2 *guest_cpuid) { GUEST_SYNC(1); @@ -60,7 +51,7 @@ static void guest_main(struct kvm_cpuid2 *guest_cpuid) GUEST_SYNC(2); - test_cpuid_40000000(guest_cpuid); + GUEST_ASSERT(this_cpu_property(X86_PROPERTY_MAX_KVM_LEAF) == 0x40000001); GUEST_DONE(); } diff --git a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c index 4208487652f8..1027a671c7d3 100644 --- a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c +++ b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c @@ -57,9 +57,6 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XSAVE)); - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - vm = vm_create_with_one_vcpu(&vcpu, guest_code); run = vcpu->run; diff --git a/tools/testing/selftests/kvm/x86_64/emulator_error_test.c b/tools/testing/selftests/kvm/x86_64/emulator_error_test.c deleted file mode 100644 index 236e11755ba6..000000000000 --- a/tools/testing/selftests/kvm/x86_64/emulator_error_test.c +++ /dev/null @@ -1,193 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2020, Google LLC. - * - * Tests for KVM_CAP_EXIT_ON_EMULATION_FAILURE capability. - */ - -#define _GNU_SOURCE /* for program_invocation_short_name */ - -#include "test_util.h" -#include "kvm_util.h" -#include "vmx.h" - -#define MAXPHYADDR 36 - -#define MEM_REGION_GVA 0x0000123456789000 -#define MEM_REGION_GPA 0x0000000700000000 -#define MEM_REGION_SLOT 10 -#define MEM_REGION_SIZE PAGE_SIZE - -static void guest_code(void) -{ - __asm__ __volatile__("flds (%[addr])" - :: [addr]"r"(MEM_REGION_GVA)); - - GUEST_DONE(); -} - -/* - * Accessors to get R/M, REG, and Mod bits described in the SDM vol 2, - * figure 2-2 "Table Interpretation of ModR/M Byte (C8H)". - */ -#define GET_RM(insn_byte) (insn_byte & 0x7) -#define GET_REG(insn_byte) ((insn_byte & 0x38) >> 3) -#define GET_MOD(insn_byte) ((insn_byte & 0xc) >> 6) - -/* Ensure we are dealing with a simple 2-byte flds instruction. */ -static bool is_flds(uint8_t *insn_bytes, uint8_t insn_size) -{ - return insn_size >= 2 && - insn_bytes[0] == 0xd9 && - GET_REG(insn_bytes[1]) == 0x0 && - GET_MOD(insn_bytes[1]) == 0x0 && - /* Ensure there is no SIB byte. */ - GET_RM(insn_bytes[1]) != 0x4 && - /* Ensure there is no displacement byte. */ - GET_RM(insn_bytes[1]) != 0x5; -} - -static void process_exit_on_emulation_error(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - struct kvm_regs regs; - uint8_t *insn_bytes; - uint8_t insn_size; - uint64_t flags; - - TEST_ASSERT(run->exit_reason == KVM_EXIT_INTERNAL_ERROR, - "Unexpected exit reason: %u (%s)", - run->exit_reason, - exit_reason_str(run->exit_reason)); - - TEST_ASSERT(run->emulation_failure.suberror == KVM_INTERNAL_ERROR_EMULATION, - "Unexpected suberror: %u", - run->emulation_failure.suberror); - - if (run->emulation_failure.ndata >= 1) { - flags = run->emulation_failure.flags; - if ((flags & KVM_INTERNAL_ERROR_EMULATION_FLAG_INSTRUCTION_BYTES) && - run->emulation_failure.ndata >= 3) { - insn_size = run->emulation_failure.insn_size; - insn_bytes = run->emulation_failure.insn_bytes; - - TEST_ASSERT(insn_size <= 15 && insn_size > 0, - "Unexpected instruction size: %u", - insn_size); - - TEST_ASSERT(is_flds(insn_bytes, insn_size), - "Unexpected instruction. Expected 'flds' (0xd9 /0)"); - - /* - * If is_flds() succeeded then the instruction bytes - * contained an flds instruction that is 2-bytes in - * length (ie: no prefix, no SIB, no displacement). - */ - vcpu_regs_get(vcpu, ®s); - regs.rip += 2; - vcpu_regs_set(vcpu, ®s); - } - } -} - -static void do_guest_assert(struct ucall *uc) -{ - REPORT_GUEST_ASSERT(*uc); -} - -static void check_for_guest_assert(struct kvm_vcpu *vcpu) -{ - struct ucall uc; - - if (vcpu->run->exit_reason == KVM_EXIT_IO && - get_ucall(vcpu, &uc) == UCALL_ABORT) { - do_guest_assert(&uc); - } -} - -static void process_ucall_done(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - struct ucall uc; - - check_for_guest_assert(vcpu); - - TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, - "Unexpected exit reason: %u (%s)", - run->exit_reason, - exit_reason_str(run->exit_reason)); - - TEST_ASSERT(get_ucall(vcpu, &uc) == UCALL_DONE, - "Unexpected ucall command: %lu, expected UCALL_DONE (%d)", - uc.cmd, UCALL_DONE); -} - -static uint64_t process_ucall(struct kvm_vcpu *vcpu) -{ - struct kvm_run *run = vcpu->run; - struct ucall uc; - - TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, - "Unexpected exit reason: %u (%s)", - run->exit_reason, - exit_reason_str(run->exit_reason)); - - switch (get_ucall(vcpu, &uc)) { - case UCALL_SYNC: - break; - case UCALL_ABORT: - do_guest_assert(&uc); - break; - case UCALL_DONE: - process_ucall_done(vcpu); - break; - default: - TEST_ASSERT(false, "Unexpected ucall"); - } - - return uc.cmd; -} - -int main(int argc, char *argv[]) -{ - struct kvm_vcpu *vcpu; - struct kvm_vm *vm; - uint64_t gpa, pte; - uint64_t *hva; - int rc; - - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - - TEST_REQUIRE(kvm_has_cap(KVM_CAP_SMALLER_MAXPHYADDR)); - - vm = vm_create_with_one_vcpu(&vcpu, guest_code); - - vcpu_set_cpuid_maxphyaddr(vcpu, MAXPHYADDR); - - rc = kvm_check_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE); - TEST_ASSERT(rc, "KVM_CAP_EXIT_ON_EMULATION_FAILURE is unavailable"); - vm_enable_cap(vm, KVM_CAP_EXIT_ON_EMULATION_FAILURE, 1); - - vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, - MEM_REGION_GPA, MEM_REGION_SLOT, - MEM_REGION_SIZE / PAGE_SIZE, 0); - gpa = vm_phy_pages_alloc(vm, MEM_REGION_SIZE / PAGE_SIZE, - MEM_REGION_GPA, MEM_REGION_SLOT); - TEST_ASSERT(gpa == MEM_REGION_GPA, "Failed vm_phy_pages_alloc\n"); - virt_map(vm, MEM_REGION_GVA, MEM_REGION_GPA, 1); - hva = addr_gpa2hva(vm, MEM_REGION_GPA); - memset(hva, 0, PAGE_SIZE); - pte = vm_get_page_table_entry(vm, vcpu, MEM_REGION_GVA); - vm_set_page_table_entry(vm, vcpu, MEM_REGION_GVA, pte | (1ull << 36)); - - vcpu_run(vcpu); - process_exit_on_emulation_error(vcpu); - vcpu_run(vcpu); - - TEST_ASSERT(process_ucall(vcpu) == UCALL_DONE, "Expected UCALL_DONE"); - - kvm_vm_free(vm); - - return 0; -} diff --git a/tools/testing/selftests/kvm/x86_64/exit_on_emulation_failure_test.c b/tools/testing/selftests/kvm/x86_64/exit_on_emulation_failure_test.c new file mode 100644 index 000000000000..37c61f712fd5 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/exit_on_emulation_failure_test.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022, Google LLC. + * + * Test for KVM_CAP_EXIT_ON_EMULATION_FAILURE. + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ + +#include "flds_emulation.h" + +#include "test_util.h" + +#define MMIO_GPA 0x700000000 +#define MMIO_GVA MMIO_GPA + +static void guest_code(void) +{ + /* Execute flds with an MMIO address to force KVM to emulate it. */ + flds(MMIO_GVA); + GUEST_DONE(); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + /* Tell stdout not to buffer its content */ + setbuf(stdout, NULL); + + TEST_REQUIRE(kvm_has_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE)); + + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + vm_enable_cap(vm, KVM_CAP_EXIT_ON_EMULATION_FAILURE, 1); + virt_map(vm, MMIO_GVA, MMIO_GPA, 1); + + vcpu_run(vcpu); + handle_flds_emulation_failure_exit(vcpu); + vcpu_run(vcpu); + ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_DONE); + + kvm_vm_free(vm); + return 0; +} diff --git a/tools/testing/selftests/kvm/x86_64/flds_emulation.h b/tools/testing/selftests/kvm/x86_64/flds_emulation.h new file mode 100644 index 000000000000..e43a7df25f2c --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/flds_emulation.h @@ -0,0 +1,55 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef SELFTEST_KVM_FLDS_EMULATION_H +#define SELFTEST_KVM_FLDS_EMULATION_H + +#include "kvm_util.h" + +#define FLDS_MEM_EAX ".byte 0xd9, 0x00" + +/* + * flds is an instruction that the KVM instruction emulator is known not to + * support. This can be used in guest code along with a mechanism to force + * KVM to emulate the instruction (e.g. by providing an MMIO address) to + * exercise emulation failures. + */ +static inline void flds(uint64_t address) +{ + __asm__ __volatile__(FLDS_MEM_EAX :: "a"(address)); +} + +static inline void handle_flds_emulation_failure_exit(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + struct kvm_regs regs; + uint8_t *insn_bytes; + uint64_t flags; + + TEST_ASSERT(run->exit_reason == KVM_EXIT_INTERNAL_ERROR, + "Unexpected exit reason: %u (%s)", + run->exit_reason, + exit_reason_str(run->exit_reason)); + + TEST_ASSERT(run->emulation_failure.suberror == KVM_INTERNAL_ERROR_EMULATION, + "Unexpected suberror: %u", + run->emulation_failure.suberror); + + flags = run->emulation_failure.flags; + TEST_ASSERT(run->emulation_failure.ndata >= 3 && + flags & KVM_INTERNAL_ERROR_EMULATION_FLAG_INSTRUCTION_BYTES, + "run->emulation_failure is missing instruction bytes"); + + TEST_ASSERT(run->emulation_failure.insn_size >= 2, + "Expected a 2-byte opcode for 'flds', got %d bytes", + run->emulation_failure.insn_size); + + insn_bytes = run->emulation_failure.insn_bytes; + TEST_ASSERT(insn_bytes[0] == 0xd9 && insn_bytes[1] == 0, + "Expected 'flds [eax]', opcode '0xd9 0x00', got opcode 0x%02x 0x%02x\n", + insn_bytes[0], insn_bytes[1]); + + vcpu_regs_get(vcpu, ®s); + regs.rip += 2; + vcpu_regs_set(vcpu, ®s); +} + +#endif /* !SELFTEST_KVM_FLDS_EMULATION_H */ diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c index e804eb08dff9..5c27efbf405e 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c @@ -134,9 +134,6 @@ int main(int argc, char *argv[]) const struct kvm_cpuid2 *hv_cpuid_entries; struct kvm_vcpu *vcpu; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID)); vm = vm_create_with_one_vcpu(&vcpu, guest_code); diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_evmcs.c index 99bc202243d2..af29e5776d40 100644 --- a/tools/testing/selftests/kvm/x86_64/evmcs_test.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_evmcs.c @@ -16,6 +16,7 @@ #include "kvm_util.h" +#include "hyperv.h" #include "vmx.h" static int ud_count; @@ -30,24 +31,19 @@ static void guest_nmi_handler(struct ex_regs *regs) { } -/* Exits to L1 destroy GRPs! */ -static inline void rdmsr_fs_base(void) +static inline void rdmsr_from_l2(uint32_t msr) { - __asm__ __volatile__ ("mov $0xc0000100, %%rcx; rdmsr" : : : - "rax", "rbx", "rcx", "rdx", - "rsi", "rdi", "r8", "r9", "r10", "r11", "r12", - "r13", "r14", "r15"); -} -static inline void rdmsr_gs_base(void) -{ - __asm__ __volatile__ ("mov $0xc0000101, %%rcx; rdmsr" : : : - "rax", "rbx", "rcx", "rdx", - "rsi", "rdi", "r8", "r9", "r10", "r11", "r12", - "r13", "r14", "r15"); + /* Currently, L1 doesn't preserve GPRs during vmexits. */ + __asm__ __volatile__ ("rdmsr" : : "c"(msr) : + "rax", "rbx", "rdx", "rsi", "rdi", "r8", "r9", + "r10", "r11", "r12", "r13", "r14", "r15"); } +/* Exit to L1 from L2 with RDMSR instruction */ void l2_guest_code(void) { + u64 unused; + GUEST_SYNC(7); GUEST_SYNC(8); @@ -58,42 +54,58 @@ void l2_guest_code(void) vmcall(); /* MSR-Bitmap tests */ - rdmsr_fs_base(); /* intercepted */ - rdmsr_fs_base(); /* intercepted */ - rdmsr_gs_base(); /* not intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */ vmcall(); - rdmsr_gs_base(); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* intercepted */ + + /* L2 TLB flush tests */ + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS); + rdmsr_from_l2(MSR_FS_BASE); + /* + * Note: hypercall status (RAX) is not preserved correctly by L1 after + * synthetic vmexit, use unchecked version. + */ + __hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS, + &unused); /* Done, exit to L1 and never come back. */ vmcall(); } -void guest_code(struct vmx_pages *vmx_pages) +void guest_code(struct vmx_pages *vmx_pages, struct hyperv_test_pages *hv_pages, + vm_vaddr_t hv_hcall_page_gpa) { #define L2_GUEST_STACK_SIZE 64 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, hv_hcall_page_gpa); + x2apic_enable(); GUEST_SYNC(1); GUEST_SYNC(2); - enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist); + enable_vp_assist(hv_pages->vp_assist_gpa, hv_pages->vp_assist); + evmcs_enable(); - GUEST_ASSERT(vmx_pages->vmcs_gpa); GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages)); GUEST_SYNC(3); - GUEST_ASSERT(load_vmcs(vmx_pages)); - GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa); + GUEST_ASSERT(load_evmcs(hv_pages)); + GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa); GUEST_SYNC(4); - GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa); + GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa); prepare_vmcs(vmx_pages, l2_guest_code, &l2_guest_stack[L2_GUEST_STACK_SIZE]); GUEST_SYNC(5); - GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa); + GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa); current_evmcs->revision_id = -1u; GUEST_ASSERT(vmlaunch()); current_evmcs->revision_id = EVMCS_VERSION; @@ -102,8 +114,18 @@ void guest_code(struct vmx_pages *vmx_pages) vmwrite(PIN_BASED_VM_EXEC_CONTROL, vmreadz(PIN_BASED_VM_EXEC_CONTROL) | PIN_BASED_NMI_EXITING); + /* L2 TLB flush setup */ + current_evmcs->partition_assist_page = hv_pages->partition_assist_gpa; + current_evmcs->hv_enlightenments_control.nested_flush_hypercall = 1; + current_evmcs->hv_vm_id = 1; + current_evmcs->hv_vp_id = 1; + current_vp_assist->nested_control.features.directhypercall = 1; + *(u32 *)(hv_pages->partition_assist) = 0; + GUEST_ASSERT(!vmlaunch()); - GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa); + GUEST_ASSERT_EQ(vmreadz(VM_EXIT_REASON), EXIT_REASON_EXCEPTION_NMI); + GUEST_ASSERT_EQ((vmreadz(VM_EXIT_INTR_INFO) & 0xff), NMI_VECTOR); + GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa); /* * NMI forces L2->L1 exit, resuming L2 and hope that EVMCS is @@ -120,7 +142,7 @@ void guest_code(struct vmx_pages *vmx_pages) /* Intercept RDMSR 0xc0000100 */ vmwrite(CPU_BASED_VM_EXEC_CONTROL, vmreadz(CPU_BASED_VM_EXEC_CONTROL) | CPU_BASED_USE_MSR_BITMAPS); - set_bit(MSR_FS_BASE & 0x1fff, vmx_pages->msr + 0x400); + __set_bit(MSR_FS_BASE & 0x1fff, vmx_pages->msr + 0x400); GUEST_ASSERT(!vmresume()); GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ); current_evmcs->guest_rip += 2; /* rdmsr */ @@ -132,7 +154,7 @@ void guest_code(struct vmx_pages *vmx_pages) current_evmcs->guest_rip += 2; /* rdmsr */ /* Intercept RDMSR 0xc0000101 without telling KVM about it */ - set_bit(MSR_GS_BASE & 0x1fff, vmx_pages->msr + 0x400); + __set_bit(MSR_GS_BASE & 0x1fff, vmx_pages->msr + 0x400); /* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */ current_evmcs->hv_clean_fields |= HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP; GUEST_ASSERT(!vmresume()); @@ -146,12 +168,24 @@ void guest_code(struct vmx_pages *vmx_pages) GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ); current_evmcs->guest_rip += 2; /* rdmsr */ + /* + * L2 TLB flush test. First VMCALL should be handled directly by L0, + * no VMCALL exit expected. + */ + GUEST_ASSERT(!vmresume()); + GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ); + current_evmcs->guest_rip += 2; /* rdmsr */ + /* Enable synthetic vmexit */ + *(u32 *)(hv_pages->partition_assist) = 1; + GUEST_ASSERT(!vmresume()); + GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH); + GUEST_ASSERT(!vmresume()); GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL); GUEST_SYNC(11); /* Try enlightened vmptrld with an incorrect GPA */ - evmcs_vmptrld(0xdeadbeef, vmx_pages->enlightened_vmcs); + evmcs_vmptrld(0xdeadbeef, hv_pages->enlightened_vmcs); GUEST_ASSERT(vmlaunch()); GUEST_ASSERT(ud_count == 1); GUEST_DONE(); @@ -198,7 +232,8 @@ static struct kvm_vcpu *save_restore_vm(struct kvm_vm *vm, int main(int argc, char *argv[]) { - vm_vaddr_t vmx_pages_gva = 0; + vm_vaddr_t vmx_pages_gva = 0, hv_pages_gva = 0; + vm_vaddr_t hcall_page; struct kvm_vcpu *vcpu; struct kvm_vm *vm; @@ -212,11 +247,16 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_has_cap(KVM_CAP_NESTED_STATE)); TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)); + hcall_page = vm_vaddr_alloc_pages(vm, 1); + memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize()); + vcpu_set_hv_cpuid(vcpu); vcpu_enable_evmcs(vcpu); vcpu_alloc_vmx(vm, &vmx_pages_gva); - vcpu_args_set(vcpu, 1, vmx_pages_gva); + vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva); + vcpu_args_set(vcpu, 3, vmx_pages_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page)); + vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id); vm_init_descriptor_tables(vm); vcpu_init_descriptor_tables(vcpu); diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_features.c b/tools/testing/selftests/kvm/x86_64/hyperv_features.c index 05b32e550a80..3163c3e8db0a 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_features.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_features.c @@ -13,25 +13,6 @@ #include "processor.h" #include "hyperv.h" -#define LINUX_OS_ID ((u64)0x8100 << 48) - -static inline uint8_t hypercall(u64 control, vm_vaddr_t input_address, - vm_vaddr_t output_address, uint64_t *hv_status) -{ - uint8_t vector; - - /* Note both the hypercall and the "asm safe" clobber r9-r11. */ - asm volatile("mov %[output_address], %%r8\n\t" - KVM_ASM_SAFE("vmcall") - : "=a" (*hv_status), - "+c" (control), "+d" (input_address), - KVM_ASM_SAFE_OUTPUTS(vector) - : [output_address] "r"(output_address), - "a" (-EFAULT) - : "cc", "memory", "r8", KVM_ASM_SAFE_CLOBBERS); - return vector; -} - struct msr_data { uint32_t idx; bool available; @@ -71,7 +52,7 @@ static void guest_hcall(vm_vaddr_t pgs_gpa, struct hcall_data *hcall) GUEST_ASSERT(hcall->control); - wrmsr(HV_X64_MSR_GUEST_OS_ID, LINUX_OS_ID); + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa); if (!(hcall->control & HV_HYPERCALL_FAST_BIT)) { @@ -81,7 +62,7 @@ static void guest_hcall(vm_vaddr_t pgs_gpa, struct hcall_data *hcall) input = output = 0; } - vector = hypercall(hcall->control, input, output, &res); + vector = __hyperv_hypercall(hcall->control, input, output, &res); if (hcall->ud_expected) { GUEST_ASSERT_2(vector == UD_VECTOR, hcall->control, vector); } else { @@ -169,7 +150,7 @@ static void guest_test_msrs_access(void) */ msr->idx = HV_X64_MSR_GUEST_OS_ID; msr->write = 1; - msr->write_val = LINUX_OS_ID; + msr->write_val = HYPERV_LINUX_OS_ID; msr->available = 1; break; case 3: diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_ipi.c b/tools/testing/selftests/kvm/x86_64/hyperv_ipi.c new file mode 100644 index 000000000000..8b791eac7d5a --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/hyperv_ipi.c @@ -0,0 +1,314 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Hyper-V HvCallSendSyntheticClusterIpi{,Ex} tests + * + * Copyright (C) 2022, Red Hat, Inc. + * + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include <pthread.h> +#include <inttypes.h> + +#include "kvm_util.h" +#include "hyperv.h" +#include "test_util.h" +#include "vmx.h" + +#define RECEIVER_VCPU_ID_1 2 +#define RECEIVER_VCPU_ID_2 65 + +#define IPI_VECTOR 0xfe + +static volatile uint64_t ipis_rcvd[RECEIVER_VCPU_ID_2 + 1]; + +struct hv_vpset { + u64 format; + u64 valid_bank_mask; + u64 bank_contents[2]; +}; + +enum HV_GENERIC_SET_FORMAT { + HV_GENERIC_SET_SPARSE_4K, + HV_GENERIC_SET_ALL, +}; + +/* HvCallSendSyntheticClusterIpi hypercall */ +struct hv_send_ipi { + u32 vector; + u32 reserved; + u64 cpu_mask; +}; + +/* HvCallSendSyntheticClusterIpiEx hypercall */ +struct hv_send_ipi_ex { + u32 vector; + u32 reserved; + struct hv_vpset vp_set; +}; + +static inline void hv_init(vm_vaddr_t pgs_gpa) +{ + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa); +} + +static void receiver_code(void *hcall_page, vm_vaddr_t pgs_gpa) +{ + u32 vcpu_id; + + x2apic_enable(); + hv_init(pgs_gpa); + + vcpu_id = rdmsr(HV_X64_MSR_VP_INDEX); + + /* Signal sender vCPU we're ready */ + ipis_rcvd[vcpu_id] = (u64)-1; + + for (;;) + asm volatile("sti; hlt; cli"); +} + +static void guest_ipi_handler(struct ex_regs *regs) +{ + u32 vcpu_id = rdmsr(HV_X64_MSR_VP_INDEX); + + ipis_rcvd[vcpu_id]++; + wrmsr(HV_X64_MSR_EOI, 1); +} + +static inline void nop_loop(void) +{ + int i; + + for (i = 0; i < 100000000; i++) + asm volatile("nop"); +} + +static void sender_guest_code(void *hcall_page, vm_vaddr_t pgs_gpa) +{ + struct hv_send_ipi *ipi = (struct hv_send_ipi *)hcall_page; + struct hv_send_ipi_ex *ipi_ex = (struct hv_send_ipi_ex *)hcall_page; + int stage = 1, ipis_expected[2] = {0}; + + hv_init(pgs_gpa); + GUEST_SYNC(stage++); + + /* Wait for receiver vCPUs to come up */ + while (!ipis_rcvd[RECEIVER_VCPU_ID_1] || !ipis_rcvd[RECEIVER_VCPU_ID_2]) + nop_loop(); + ipis_rcvd[RECEIVER_VCPU_ID_1] = ipis_rcvd[RECEIVER_VCPU_ID_2] = 0; + + /* 'Slow' HvCallSendSyntheticClusterIpi to RECEIVER_VCPU_ID_1 */ + ipi->vector = IPI_VECTOR; + ipi->cpu_mask = 1 << RECEIVER_VCPU_ID_1; + hyperv_hypercall(HVCALL_SEND_IPI, pgs_gpa, pgs_gpa + 4096); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]); + GUEST_SYNC(stage++); + /* 'Fast' HvCallSendSyntheticClusterIpi to RECEIVER_VCPU_ID_1 */ + hyperv_hypercall(HVCALL_SEND_IPI | HV_HYPERCALL_FAST_BIT, + IPI_VECTOR, 1 << RECEIVER_VCPU_ID_1); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]); + GUEST_SYNC(stage++); + + /* 'Slow' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_1 */ + memset(hcall_page, 0, 4096); + ipi_ex->vector = IPI_VECTOR; + ipi_ex->vp_set.format = HV_GENERIC_SET_SPARSE_4K; + ipi_ex->vp_set.valid_bank_mask = 1 << 0; + ipi_ex->vp_set.bank_contents[0] = BIT(RECEIVER_VCPU_ID_1); + hyperv_hypercall(HVCALL_SEND_IPI_EX | (1 << HV_HYPERCALL_VARHEAD_OFFSET), + pgs_gpa, pgs_gpa + 4096); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]); + GUEST_SYNC(stage++); + /* 'XMM Fast' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_1 */ + hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 1); + hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT | + (1 << HV_HYPERCALL_VARHEAD_OFFSET), + IPI_VECTOR, HV_GENERIC_SET_SPARSE_4K); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ipis_expected[1]); + GUEST_SYNC(stage++); + + /* 'Slow' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_2 */ + memset(hcall_page, 0, 4096); + ipi_ex->vector = IPI_VECTOR; + ipi_ex->vp_set.format = HV_GENERIC_SET_SPARSE_4K; + ipi_ex->vp_set.valid_bank_mask = 1 << 1; + ipi_ex->vp_set.bank_contents[0] = BIT(RECEIVER_VCPU_ID_2 - 64); + hyperv_hypercall(HVCALL_SEND_IPI_EX | (1 << HV_HYPERCALL_VARHEAD_OFFSET), + pgs_gpa, pgs_gpa + 4096); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]); + GUEST_SYNC(stage++); + /* 'XMM Fast' HvCallSendSyntheticClusterIpiEx to RECEIVER_VCPU_ID_2 */ + hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 1); + hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT | + (1 << HV_HYPERCALL_VARHEAD_OFFSET), + IPI_VECTOR, HV_GENERIC_SET_SPARSE_4K); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]); + GUEST_SYNC(stage++); + + /* 'Slow' HvCallSendSyntheticClusterIpiEx to both RECEIVER_VCPU_ID_{1,2} */ + memset(hcall_page, 0, 4096); + ipi_ex->vector = IPI_VECTOR; + ipi_ex->vp_set.format = HV_GENERIC_SET_SPARSE_4K; + ipi_ex->vp_set.valid_bank_mask = 1 << 1 | 1; + ipi_ex->vp_set.bank_contents[0] = BIT(RECEIVER_VCPU_ID_1); + ipi_ex->vp_set.bank_contents[1] = BIT(RECEIVER_VCPU_ID_2 - 64); + hyperv_hypercall(HVCALL_SEND_IPI_EX | (2 << HV_HYPERCALL_VARHEAD_OFFSET), + pgs_gpa, pgs_gpa + 4096); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]); + GUEST_SYNC(stage++); + /* 'XMM Fast' HvCallSendSyntheticClusterIpiEx to both RECEIVER_VCPU_ID_{1, 2} */ + hyperv_write_xmm_input(&ipi_ex->vp_set.valid_bank_mask, 2); + hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT | + (2 << HV_HYPERCALL_VARHEAD_OFFSET), + IPI_VECTOR, HV_GENERIC_SET_SPARSE_4K); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]); + GUEST_SYNC(stage++); + + /* 'Slow' HvCallSendSyntheticClusterIpiEx to HV_GENERIC_SET_ALL */ + memset(hcall_page, 0, 4096); + ipi_ex->vector = IPI_VECTOR; + ipi_ex->vp_set.format = HV_GENERIC_SET_ALL; + hyperv_hypercall(HVCALL_SEND_IPI_EX, pgs_gpa, pgs_gpa + 4096); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]); + GUEST_SYNC(stage++); + /* + * 'XMM Fast' HvCallSendSyntheticClusterIpiEx to HV_GENERIC_SET_ALL. + * Nothing to write anything to XMM regs. + */ + hyperv_hypercall(HVCALL_SEND_IPI_EX | HV_HYPERCALL_FAST_BIT, + IPI_VECTOR, HV_GENERIC_SET_ALL); + nop_loop(); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_1] == ++ipis_expected[0]); + GUEST_ASSERT(ipis_rcvd[RECEIVER_VCPU_ID_2] == ++ipis_expected[1]); + GUEST_SYNC(stage++); + + GUEST_DONE(); +} + +static void *vcpu_thread(void *arg) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)arg; + int old, r; + + r = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old); + TEST_ASSERT(!r, "pthread_setcanceltype failed on vcpu_id=%u with errno=%d", + vcpu->id, r); + + vcpu_run(vcpu); + + TEST_FAIL("vCPU %u exited unexpectedly", vcpu->id); + + return NULL; +} + +static void cancel_join_vcpu_thread(pthread_t thread, struct kvm_vcpu *vcpu) +{ + void *retval; + int r; + + r = pthread_cancel(thread); + TEST_ASSERT(!r, "pthread_cancel on vcpu_id=%d failed with errno=%d", + vcpu->id, r); + + r = pthread_join(thread, &retval); + TEST_ASSERT(!r, "pthread_join on vcpu_id=%d failed with errno=%d", + vcpu->id, r); + TEST_ASSERT(retval == PTHREAD_CANCELED, + "expected retval=%p, got %p", PTHREAD_CANCELED, + retval); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vm *vm; + struct kvm_vcpu *vcpu[3]; + unsigned int exit_reason; + vm_vaddr_t hcall_page; + pthread_t threads[2]; + int stage = 1, r; + struct ucall uc; + + vm = vm_create_with_one_vcpu(&vcpu[0], sender_guest_code); + + /* Hypercall input/output */ + hcall_page = vm_vaddr_alloc_pages(vm, 2); + memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize()); + + vm_init_descriptor_tables(vm); + + vcpu[1] = vm_vcpu_add(vm, RECEIVER_VCPU_ID_1, receiver_code); + vcpu_init_descriptor_tables(vcpu[1]); + vcpu_args_set(vcpu[1], 2, hcall_page, addr_gva2gpa(vm, hcall_page)); + vcpu_set_msr(vcpu[1], HV_X64_MSR_VP_INDEX, RECEIVER_VCPU_ID_1); + vcpu_set_hv_cpuid(vcpu[1]); + + vcpu[2] = vm_vcpu_add(vm, RECEIVER_VCPU_ID_2, receiver_code); + vcpu_init_descriptor_tables(vcpu[2]); + vcpu_args_set(vcpu[2], 2, hcall_page, addr_gva2gpa(vm, hcall_page)); + vcpu_set_msr(vcpu[2], HV_X64_MSR_VP_INDEX, RECEIVER_VCPU_ID_2); + vcpu_set_hv_cpuid(vcpu[2]); + + vm_install_exception_handler(vm, IPI_VECTOR, guest_ipi_handler); + + vcpu_args_set(vcpu[0], 2, hcall_page, addr_gva2gpa(vm, hcall_page)); + vcpu_set_hv_cpuid(vcpu[0]); + + r = pthread_create(&threads[0], NULL, vcpu_thread, vcpu[1]); + TEST_ASSERT(!r, "pthread_create failed errno=%d", r); + + r = pthread_create(&threads[1], NULL, vcpu_thread, vcpu[2]); + TEST_ASSERT(!r, "pthread_create failed errno=%d", errno); + + while (true) { + vcpu_run(vcpu[0]); + + exit_reason = vcpu[0]->run->exit_reason; + TEST_ASSERT(exit_reason == KVM_EXIT_IO, + "unexpected exit reason: %u (%s)", + exit_reason, exit_reason_str(exit_reason)); + + switch (get_ucall(vcpu[0], &uc)) { + case UCALL_SYNC: + TEST_ASSERT(uc.args[1] == stage, + "Unexpected stage: %ld (%d expected)\n", + uc.args[1], stage); + break; + case UCALL_DONE: + goto done; + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + /* NOT REACHED */ + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); + } + + stage++; + } + +done: + cancel_join_vcpu_thread(threads[0], vcpu[1]); + cancel_join_vcpu_thread(threads[1], vcpu[2]); + kvm_vm_free(vm); + + return r; +} diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c index a380ad7bb9b3..68a7d354ea07 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c @@ -23,59 +23,78 @@ #define L2_GUEST_STACK_SIZE 256 -struct hv_enlightenments { - struct __packed hv_enlightenments_control { - u32 nested_flush_hypercall:1; - u32 msr_bitmap:1; - u32 enlightened_npt_tlb: 1; - u32 reserved:29; - } __packed hv_enlightenments_control; - u32 hv_vp_id; - u64 hv_vm_id; - u64 partition_assist_page; - u64 reserved; -} __packed; - -/* - * Hyper-V uses the software reserved clean bit in VMCB - */ -#define VMCB_HV_NESTED_ENLIGHTENMENTS (1U << 31) +/* Exit to L1 from L2 with RDMSR instruction */ +static inline void rdmsr_from_l2(uint32_t msr) +{ + /* Currently, L1 doesn't preserve GPRs during vmexits. */ + __asm__ __volatile__ ("rdmsr" : : "c"(msr) : + "rax", "rbx", "rdx", "rsi", "rdi", "r8", "r9", + "r10", "r11", "r12", "r13", "r14", "r15"); +} void l2_guest_code(void) { + u64 unused; + GUEST_SYNC(3); /* Exit to L1 */ vmmcall(); /* MSR-Bitmap tests */ - rdmsr(MSR_FS_BASE); /* intercepted */ - rdmsr(MSR_FS_BASE); /* intercepted */ - rdmsr(MSR_GS_BASE); /* not intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */ vmmcall(); - rdmsr(MSR_GS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* intercepted */ GUEST_SYNC(5); + /* L2 TLB flush tests */ + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | + HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | + HV_FLUSH_ALL_PROCESSORS); + rdmsr_from_l2(MSR_FS_BASE); + /* + * Note: hypercall status (RAX) is not preserved correctly by L1 after + * synthetic vmexit, use unchecked version. + */ + __hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | + HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | + HV_FLUSH_ALL_PROCESSORS, &unused); + /* Done, exit to L1 and never come back. */ vmmcall(); } -static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) +static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm, + struct hyperv_test_pages *hv_pages, + vm_vaddr_t pgs_gpa) { unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; struct vmcb *vmcb = svm->vmcb; - struct hv_enlightenments *hve = - (struct hv_enlightenments *)vmcb->control.reserved_sw; + struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; GUEST_SYNC(1); - wrmsr(HV_X64_MSR_GUEST_OS_ID, (u64)0x8100 << 48); + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa); + enable_vp_assist(hv_pages->vp_assist_gpa, hv_pages->vp_assist); GUEST_ASSERT(svm->vmcb_gpa); /* Prepare for L2 execution. */ generic_svm_setup(svm, l2_guest_code, &l2_guest_stack[L2_GUEST_STACK_SIZE]); + /* L2 TLB flush setup */ + hve->partition_assist_page = hv_pages->partition_assist_gpa; + hve->hv_enlightenments_control.nested_flush_hypercall = 1; + hve->hv_vm_id = 1; + hve->hv_vp_id = 1; + current_vp_assist->nested_control.features.directhypercall = 1; + *(u32 *)(hv_pages->partition_assist) = 0; + GUEST_SYNC(2); run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); @@ -84,7 +103,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) /* Intercept RDMSR 0xc0000100 */ vmcb->control.intercept |= 1ULL << INTERCEPT_MSR_PROT; - set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800); + __set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800); run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR); vmcb->save.rip += 2; /* rdmsr */ @@ -96,20 +115,34 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) vmcb->save.rip += 2; /* rdmsr */ /* Intercept RDMSR 0xc0000101 without telling KVM about it */ - set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800); + __set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800); /* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */ - vmcb->control.clean |= VMCB_HV_NESTED_ENLIGHTENMENTS; + vmcb->control.clean |= HV_VMCB_NESTED_ENLIGHTENMENTS; run_guest(vmcb, svm->vmcb_gpa); /* Make sure we don't see SVM_EXIT_MSR here so eMSR bitmap works */ GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); vmcb->save.rip += 3; /* vmcall */ /* Now tell KVM we've changed MSR-Bitmap */ - vmcb->control.clean &= ~VMCB_HV_NESTED_ENLIGHTENMENTS; + vmcb->control.clean &= ~HV_VMCB_NESTED_ENLIGHTENMENTS; run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR); vmcb->save.rip += 2; /* rdmsr */ + + /* + * L2 TLB flush test. First VMCALL should be handled directly by L0, + * no VMCALL exit expected. + */ + run_guest(vmcb, svm->vmcb_gpa); + GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR); + vmcb->save.rip += 2; /* rdmsr */ + /* Enable synthetic vmexit */ + *(u32 *)(hv_pages->partition_assist) = 1; + run_guest(vmcb, svm->vmcb_gpa); + GUEST_ASSERT(vmcb->control.exit_code == HV_SVM_EXITCODE_ENL); + GUEST_ASSERT(vmcb->control.exit_info_1 == HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH); + run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); GUEST_SYNC(6); @@ -119,8 +152,8 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) int main(int argc, char *argv[]) { - vm_vaddr_t nested_gva = 0; - + vm_vaddr_t nested_gva = 0, hv_pages_gva = 0; + vm_vaddr_t hcall_page; struct kvm_vcpu *vcpu; struct kvm_vm *vm; struct kvm_run *run; @@ -134,7 +167,13 @@ int main(int argc, char *argv[]) vcpu_set_hv_cpuid(vcpu); run = vcpu->run; vcpu_alloc_svm(vm, &nested_gva); - vcpu_args_set(vcpu, 1, nested_gva); + vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva); + + hcall_page = vm_vaddr_alloc_pages(vm, 1); + memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize()); + + vcpu_args_set(vcpu, 3, nested_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page)); + vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id); for (stage = 1;; stage++) { vcpu_run(vcpu); diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush.c b/tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush.c new file mode 100644 index 000000000000..68f97ff720a7 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush.c @@ -0,0 +1,690 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Hyper-V HvFlushVirtualAddress{List,Space}{,Ex} tests + * + * Copyright (C) 2022, Red Hat, Inc. + * + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include <asm/barrier.h> +#include <pthread.h> +#include <inttypes.h> + +#include "kvm_util.h" +#include "processor.h" +#include "hyperv.h" +#include "test_util.h" +#include "vmx.h" + +#define WORKER_VCPU_ID_1 2 +#define WORKER_VCPU_ID_2 65 + +#define NTRY 100 +#define NTEST_PAGES 2 + +struct hv_vpset { + u64 format; + u64 valid_bank_mask; + u64 bank_contents[]; +}; + +enum HV_GENERIC_SET_FORMAT { + HV_GENERIC_SET_SPARSE_4K, + HV_GENERIC_SET_ALL, +}; + +#define HV_FLUSH_ALL_PROCESSORS BIT(0) +#define HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES BIT(1) +#define HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY BIT(2) +#define HV_FLUSH_USE_EXTENDED_RANGE_FORMAT BIT(3) + +/* HvFlushVirtualAddressSpace, HvFlushVirtualAddressList hypercalls */ +struct hv_tlb_flush { + u64 address_space; + u64 flags; + u64 processor_mask; + u64 gva_list[]; +} __packed; + +/* HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressListEx hypercalls */ +struct hv_tlb_flush_ex { + u64 address_space; + u64 flags; + struct hv_vpset hv_vp_set; + u64 gva_list[]; +} __packed; + +/* + * Pass the following info to 'workers' and 'sender' + * - Hypercall page's GVA + * - Hypercall page's GPA + * - Test pages GVA + * - GVAs of the test pages' PTEs + */ +struct test_data { + vm_vaddr_t hcall_gva; + vm_paddr_t hcall_gpa; + vm_vaddr_t test_pages; + vm_vaddr_t test_pages_pte[NTEST_PAGES]; +}; + +/* 'Worker' vCPU code checking the contents of the test page */ +static void worker_guest_code(vm_vaddr_t test_data) +{ + struct test_data *data = (struct test_data *)test_data; + u32 vcpu_id = rdmsr(HV_X64_MSR_VP_INDEX); + void *exp_page = (void *)data->test_pages + PAGE_SIZE * NTEST_PAGES; + u64 *this_cpu = (u64 *)(exp_page + vcpu_id * sizeof(u64)); + u64 expected, val; + + x2apic_enable(); + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + + for (;;) { + cpu_relax(); + + expected = READ_ONCE(*this_cpu); + + /* + * Make sure the value in the test page is read after reading + * the expectation for the first time. Pairs with wmb() in + * prepare_to_test(). + */ + rmb(); + + val = READ_ONCE(*(u64 *)data->test_pages); + + /* + * Make sure the value in the test page is read after before + * reading the expectation for the second time. Pairs with wmb() + * post_test(). + */ + rmb(); + + /* + * '0' indicates the sender is between iterations, wait until + * the sender is ready for this vCPU to start checking again. + */ + if (!expected) + continue; + + /* + * Re-read the per-vCPU byte to ensure the sender didn't move + * onto a new iteration. + */ + if (expected != READ_ONCE(*this_cpu)) + continue; + + GUEST_ASSERT(val == expected); + } +} + +/* + * Write per-CPU info indicating what each 'worker' CPU is supposed to see in + * test page. '0' means don't check. + */ +static void set_expected_val(void *addr, u64 val, int vcpu_id) +{ + void *exp_page = addr + PAGE_SIZE * NTEST_PAGES; + + *(u64 *)(exp_page + vcpu_id * sizeof(u64)) = val; +} + +/* + * Update PTEs swapping two test pages. + * TODO: use swap()/xchg() when these are provided. + */ +static void swap_two_test_pages(vm_paddr_t pte_gva1, vm_paddr_t pte_gva2) +{ + uint64_t tmp = *(uint64_t *)pte_gva1; + + *(uint64_t *)pte_gva1 = *(uint64_t *)pte_gva2; + *(uint64_t *)pte_gva2 = tmp; +} + +/* + * TODO: replace the silly NOP loop with a proper udelay() implementation. + */ +static inline void do_delay(void) +{ + int i; + + for (i = 0; i < 1000000; i++) + asm volatile("nop"); +} + +/* + * Prepare to test: 'disable' workers by setting the expectation to '0', + * clear hypercall input page and then swap two test pages. + */ +static inline void prepare_to_test(struct test_data *data) +{ + /* Clear hypercall input page */ + memset((void *)data->hcall_gva, 0, PAGE_SIZE); + + /* 'Disable' workers */ + set_expected_val((void *)data->test_pages, 0x0, WORKER_VCPU_ID_1); + set_expected_val((void *)data->test_pages, 0x0, WORKER_VCPU_ID_2); + + /* Make sure workers are 'disabled' before we swap PTEs. */ + wmb(); + + /* Make sure workers have enough time to notice */ + do_delay(); + + /* Swap test page mappings */ + swap_two_test_pages(data->test_pages_pte[0], data->test_pages_pte[1]); +} + +/* + * Finalize the test: check hypercall resule set the expected val for + * 'worker' CPUs and give them some time to test. + */ +static inline void post_test(struct test_data *data, u64 exp1, u64 exp2) +{ + /* Make sure we change the expectation after swapping PTEs */ + wmb(); + + /* Set the expectation for workers, '0' means don't test */ + set_expected_val((void *)data->test_pages, exp1, WORKER_VCPU_ID_1); + set_expected_val((void *)data->test_pages, exp2, WORKER_VCPU_ID_2); + + /* Make sure workers have enough time to test */ + do_delay(); +} + +#define TESTVAL1 0x0101010101010101 +#define TESTVAL2 0x0202020202020202 + +/* Main vCPU doing the test */ +static void sender_guest_code(vm_vaddr_t test_data) +{ + struct test_data *data = (struct test_data *)test_data; + struct hv_tlb_flush *flush = (struct hv_tlb_flush *)data->hcall_gva; + struct hv_tlb_flush_ex *flush_ex = (struct hv_tlb_flush_ex *)data->hcall_gva; + vm_paddr_t hcall_gpa = data->hcall_gpa; + int i, stage = 1; + + wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID); + wrmsr(HV_X64_MSR_HYPERCALL, data->hcall_gpa); + + /* "Slow" hypercalls */ + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE for WORKER_VCPU_ID_1 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush->processor_mask = BIT(WORKER_VCPU_ID_1); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE, hcall_gpa, + hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, 0x0); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST for WORKER_VCPU_ID_1 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush->processor_mask = BIT(WORKER_VCPU_ID_1); + flush->gva_list[0] = (u64)data->test_pages; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, 0x0); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE for HV_FLUSH_ALL_PROCESSORS */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | + HV_FLUSH_ALL_PROCESSORS; + flush->processor_mask = 0; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE, hcall_gpa, + hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST for HV_FLUSH_ALL_PROCESSORS */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | + HV_FLUSH_ALL_PROCESSORS; + flush->gva_list[0] = (u64)data->test_pages; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX for WORKER_VCPU_ID_2 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_2 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX | + (1 << HV_HYPERCALL_VARHEAD_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, 0x0, i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX for WORKER_VCPU_ID_2 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_2 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + /* bank_contents and gva_list occupy the same space, thus [1] */ + flush_ex->gva_list[1] = (u64)data->test_pages; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX | + (1 << HV_HYPERCALL_VARHEAD_OFFSET) | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, 0x0, i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX for both vCPUs */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_2 / 64) | + BIT_ULL(WORKER_VCPU_ID_1 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_1 % 64); + flush_ex->hv_vp_set.bank_contents[1] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX | + (2 << HV_HYPERCALL_VARHEAD_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX for both vCPUs */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_1 / 64) | + BIT_ULL(WORKER_VCPU_ID_2 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_1 % 64); + flush_ex->hv_vp_set.bank_contents[1] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + /* bank_contents and gva_list occupy the same space, thus [2] */ + flush_ex->gva_list[2] = (u64)data->test_pages; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX | + (2 << HV_HYPERCALL_VARHEAD_OFFSET) | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX for HV_GENERIC_SET_ALL */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_ALL; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX, + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX for HV_GENERIC_SET_ALL */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_ALL; + flush_ex->gva_list[0] = (u64)data->test_pages; + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + hcall_gpa, hcall_gpa + PAGE_SIZE); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + /* "Fast" hypercalls */ + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE for WORKER_VCPU_ID_1 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->processor_mask = BIT(WORKER_VCPU_ID_1); + hyperv_write_xmm_input(&flush->processor_mask, 1); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | + HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, 0x0); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST for WORKER_VCPU_ID_1 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->processor_mask = BIT(WORKER_VCPU_ID_1); + flush->gva_list[0] = (u64)data->test_pages; + hyperv_write_xmm_input(&flush->processor_mask, 1); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST | + HV_HYPERCALL_FAST_BIT | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, 0x0); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE for HV_FLUSH_ALL_PROCESSORS */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + hyperv_write_xmm_input(&flush->processor_mask, 1); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | + HV_HYPERCALL_FAST_BIT, 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | + HV_FLUSH_ALL_PROCESSORS); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST for HV_FLUSH_ALL_PROCESSORS */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush->gva_list[0] = (u64)data->test_pages; + hyperv_write_xmm_input(&flush->processor_mask, 1); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST | + HV_HYPERCALL_FAST_BIT | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), 0x0, + HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | + HV_FLUSH_ALL_PROCESSORS); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX for WORKER_VCPU_ID_2 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_2 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + hyperv_write_xmm_input(&flush_ex->hv_vp_set, 2); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX | + HV_HYPERCALL_FAST_BIT | + (1 << HV_HYPERCALL_VARHEAD_OFFSET), + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, 0x0, i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX for WORKER_VCPU_ID_2 */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_2 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + /* bank_contents and gva_list occupy the same space, thus [1] */ + flush_ex->gva_list[1] = (u64)data->test_pages; + hyperv_write_xmm_input(&flush_ex->hv_vp_set, 2); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX | + HV_HYPERCALL_FAST_BIT | + (1 << HV_HYPERCALL_VARHEAD_OFFSET) | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, 0x0, i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX for both vCPUs */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_2 / 64) | + BIT_ULL(WORKER_VCPU_ID_1 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_1 % 64); + flush_ex->hv_vp_set.bank_contents[1] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + hyperv_write_xmm_input(&flush_ex->hv_vp_set, 2); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX | + HV_HYPERCALL_FAST_BIT | + (2 << HV_HYPERCALL_VARHEAD_OFFSET), + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, i % 2 ? TESTVAL1 : + TESTVAL2, i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX for both vCPUs */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->hv_vp_set.format = HV_GENERIC_SET_SPARSE_4K; + flush_ex->hv_vp_set.valid_bank_mask = BIT_ULL(WORKER_VCPU_ID_1 / 64) | + BIT_ULL(WORKER_VCPU_ID_2 / 64); + flush_ex->hv_vp_set.bank_contents[0] = BIT_ULL(WORKER_VCPU_ID_1 % 64); + flush_ex->hv_vp_set.bank_contents[1] = BIT_ULL(WORKER_VCPU_ID_2 % 64); + /* bank_contents and gva_list occupy the same space, thus [2] */ + flush_ex->gva_list[2] = (u64)data->test_pages; + hyperv_write_xmm_input(&flush_ex->hv_vp_set, 3); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX | + HV_HYPERCALL_FAST_BIT | + (2 << HV_HYPERCALL_VARHEAD_OFFSET) | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX for HV_GENERIC_SET_ALL */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_ALL; + hyperv_write_xmm_input(&flush_ex->hv_vp_set, 2); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX | + HV_HYPERCALL_FAST_BIT, + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_SYNC(stage++); + + /* HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX for HV_GENERIC_SET_ALL */ + for (i = 0; i < NTRY; i++) { + prepare_to_test(data); + flush_ex->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES; + flush_ex->hv_vp_set.format = HV_GENERIC_SET_ALL; + flush_ex->gva_list[0] = (u64)data->test_pages; + hyperv_write_xmm_input(&flush_ex->hv_vp_set, 2); + hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX | + HV_HYPERCALL_FAST_BIT | + (1UL << HV_HYPERCALL_REP_COMP_OFFSET), + 0x0, HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES); + post_test(data, i % 2 ? TESTVAL1 : TESTVAL2, + i % 2 ? TESTVAL1 : TESTVAL2); + } + + GUEST_DONE(); +} + +static void *vcpu_thread(void *arg) +{ + struct kvm_vcpu *vcpu = (struct kvm_vcpu *)arg; + struct ucall uc; + int old; + int r; + unsigned int exit_reason; + + r = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old); + TEST_ASSERT(!r, "pthread_setcanceltype failed on vcpu_id=%u with errno=%d", + vcpu->id, r); + + vcpu_run(vcpu); + exit_reason = vcpu->run->exit_reason; + + TEST_ASSERT(exit_reason == KVM_EXIT_IO, + "vCPU %u exited with unexpected exit reason %u-%s, expected KVM_EXIT_IO", + vcpu->id, exit_reason, exit_reason_str(exit_reason)); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + /* NOT REACHED */ + default: + TEST_FAIL("Unexpected ucall %lu, vCPU %d", uc.cmd, vcpu->id); + } + + return NULL; +} + +static void cancel_join_vcpu_thread(pthread_t thread, struct kvm_vcpu *vcpu) +{ + void *retval; + int r; + + r = pthread_cancel(thread); + TEST_ASSERT(!r, "pthread_cancel on vcpu_id=%d failed with errno=%d", + vcpu->id, r); + + r = pthread_join(thread, &retval); + TEST_ASSERT(!r, "pthread_join on vcpu_id=%d failed with errno=%d", + vcpu->id, r); + TEST_ASSERT(retval == PTHREAD_CANCELED, + "expected retval=%p, got %p", PTHREAD_CANCELED, + retval); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vm *vm; + struct kvm_vcpu *vcpu[3]; + unsigned int exit_reason; + pthread_t threads[2]; + vm_vaddr_t test_data_page, gva; + vm_paddr_t gpa; + uint64_t *pte; + struct test_data *data; + struct ucall uc; + int stage = 1, r, i; + + vm = vm_create_with_one_vcpu(&vcpu[0], sender_guest_code); + + /* Test data page */ + test_data_page = vm_vaddr_alloc_page(vm); + data = (struct test_data *)addr_gva2hva(vm, test_data_page); + + /* Hypercall input/output */ + data->hcall_gva = vm_vaddr_alloc_pages(vm, 2); + data->hcall_gpa = addr_gva2gpa(vm, data->hcall_gva); + memset(addr_gva2hva(vm, data->hcall_gva), 0x0, 2 * PAGE_SIZE); + + /* + * Test pages: the first one is filled with '0x01's, the second with '0x02's + * and the test will swap their mappings. The third page keeps the indication + * about the current state of mappings. + */ + data->test_pages = vm_vaddr_alloc_pages(vm, NTEST_PAGES + 1); + for (i = 0; i < NTEST_PAGES; i++) + memset(addr_gva2hva(vm, data->test_pages + PAGE_SIZE * i), + (u8)(i + 1), PAGE_SIZE); + set_expected_val(addr_gva2hva(vm, data->test_pages), 0x0, WORKER_VCPU_ID_1); + set_expected_val(addr_gva2hva(vm, data->test_pages), 0x0, WORKER_VCPU_ID_2); + + /* + * Get PTE pointers for test pages and map them inside the guest. + * Use separate page for each PTE for simplicity. + */ + gva = vm_vaddr_unused_gap(vm, NTEST_PAGES * PAGE_SIZE, KVM_UTIL_MIN_VADDR); + for (i = 0; i < NTEST_PAGES; i++) { + pte = vm_get_page_table_entry(vm, data->test_pages + i * PAGE_SIZE); + gpa = addr_hva2gpa(vm, pte); + __virt_pg_map(vm, gva + PAGE_SIZE * i, gpa & PAGE_MASK, PG_LEVEL_4K); + data->test_pages_pte[i] = gva + (gpa & ~PAGE_MASK); + } + + /* + * Sender vCPU which performs the test: swaps test pages, sets expectation + * for 'workers' and issues TLB flush hypercalls. + */ + vcpu_args_set(vcpu[0], 1, test_data_page); + vcpu_set_hv_cpuid(vcpu[0]); + + /* Create worker vCPUs which check the contents of the test pages */ + vcpu[1] = vm_vcpu_add(vm, WORKER_VCPU_ID_1, worker_guest_code); + vcpu_args_set(vcpu[1], 1, test_data_page); + vcpu_set_msr(vcpu[1], HV_X64_MSR_VP_INDEX, WORKER_VCPU_ID_1); + vcpu_set_hv_cpuid(vcpu[1]); + + vcpu[2] = vm_vcpu_add(vm, WORKER_VCPU_ID_2, worker_guest_code); + vcpu_args_set(vcpu[2], 1, test_data_page); + vcpu_set_msr(vcpu[2], HV_X64_MSR_VP_INDEX, WORKER_VCPU_ID_2); + vcpu_set_hv_cpuid(vcpu[2]); + + r = pthread_create(&threads[0], NULL, vcpu_thread, vcpu[1]); + TEST_ASSERT(!r, "pthread_create() failed"); + + r = pthread_create(&threads[1], NULL, vcpu_thread, vcpu[2]); + TEST_ASSERT(!r, "pthread_create() failed"); + + while (true) { + vcpu_run(vcpu[0]); + exit_reason = vcpu[0]->run->exit_reason; + + TEST_ASSERT(exit_reason == KVM_EXIT_IO, + "unexpected exit reason: %u (%s)", + exit_reason, exit_reason_str(exit_reason)); + + switch (get_ucall(vcpu[0], &uc)) { + case UCALL_SYNC: + TEST_ASSERT(uc.args[1] == stage, + "Unexpected stage: %ld (%d expected)\n", + uc.args[1], stage); + break; + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + /* NOT REACHED */ + case UCALL_DONE: + goto done; + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); + } + + stage++; + } + +done: + cancel_join_vcpu_thread(threads[0], vcpu[1]); + cancel_join_vcpu_thread(threads[1], vcpu[2]); + kvm_vm_free(vm); + + return 0; +} diff --git a/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.c b/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.c index 59ffe7fd354f..ea0978f22db8 100644 --- a/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.c +++ b/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.c @@ -241,10 +241,10 @@ int main(int argc, char **argv) while ((opt = getopt(argc, argv, "hp:t:r")) != -1) { switch (opt) { case 'p': - reclaim_period_ms = atoi(optarg); + reclaim_period_ms = atoi_non_negative("Reclaim period", optarg); break; case 't': - token = atoi(optarg); + token = atoi_paranoid(optarg); break; case 'r': reboot_permissions = true; @@ -257,7 +257,6 @@ int main(int argc, char **argv) } TEST_REQUIRE(kvm_has_cap(KVM_CAP_VM_DISABLE_NX_HUGE_PAGES)); - TEST_REQUIRE(reclaim_period_ms > 0); __TEST_REQUIRE(token == MAGIC_TOKEN, "This test must be run with the magic token %d.\n" diff --git a/tools/testing/selftests/kvm/x86_64/platform_info_test.c b/tools/testing/selftests/kvm/x86_64/platform_info_test.c index 76417c7d687b..310a104d94f0 100644 --- a/tools/testing/selftests/kvm/x86_64/platform_info_test.c +++ b/tools/testing/selftests/kvm/x86_64/platform_info_test.c @@ -72,9 +72,6 @@ int main(int argc, char *argv[]) struct kvm_vm *vm; uint64_t msr_platform_info; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO)); vm = vm_create_with_one_vcpu(&vcpu, guest_code); diff --git a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c index ea4e259a1e2e..2de98fce7edd 100644 --- a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c +++ b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c @@ -21,29 +21,6 @@ #define ARCH_PERFMON_EVENTSEL_OS (1ULL << 17) #define ARCH_PERFMON_EVENTSEL_ENABLE (1ULL << 22) -union cpuid10_eax { - struct { - unsigned int version_id:8; - unsigned int num_counters:8; - unsigned int bit_width:8; - unsigned int mask_length:8; - } split; - unsigned int full; -}; - -union cpuid10_ebx { - struct { - unsigned int no_unhalted_core_cycles:1; - unsigned int no_instructions_retired:1; - unsigned int no_unhalted_reference_cycles:1; - unsigned int no_llc_reference:1; - unsigned int no_llc_misses:1; - unsigned int no_branch_instruction_retired:1; - unsigned int no_branch_misses_retired:1; - } split; - unsigned int full; -}; - /* End of stuff taken from perf_event.h. */ /* Oddly, this isn't in perf_event.h. */ @@ -380,46 +357,31 @@ static void test_pmu_config_disable(void (*guest_code)(void)) } /* - * Check for a non-zero PMU version, at least one general-purpose - * counter per logical processor, an EBX bit vector of length greater - * than 5, and EBX[5] clear. - */ -static bool check_intel_pmu_leaf(const struct kvm_cpuid_entry2 *entry) -{ - union cpuid10_eax eax = { .full = entry->eax }; - union cpuid10_ebx ebx = { .full = entry->ebx }; - - return eax.split.version_id && eax.split.num_counters > 0 && - eax.split.mask_length > ARCH_PERFMON_BRANCHES_RETIRED && - !ebx.split.no_branch_instruction_retired; -} - -/* - * Note that CPUID leaf 0xa is Intel-specific. This leaf should be - * clear on AMD hardware. + * On Intel, check for a non-zero PMU version, at least one general-purpose + * counter per logical processor, and support for counting the number of branch + * instructions retired. */ static bool use_intel_pmu(void) { - const struct kvm_cpuid_entry2 *entry; - - entry = kvm_get_supported_cpuid_entry(0xa); - return is_intel_cpu() && check_intel_pmu_leaf(entry); + return is_intel_cpu() && + kvm_cpu_property(X86_PROPERTY_PMU_VERSION) && + kvm_cpu_property(X86_PROPERTY_PMU_NR_GP_COUNTERS) && + kvm_pmu_has(X86_PMU_FEATURE_BRANCH_INSNS_RETIRED); } -static bool is_zen1(uint32_t eax) +static bool is_zen1(uint32_t family, uint32_t model) { - return x86_family(eax) == 0x17 && x86_model(eax) <= 0x0f; + return family == 0x17 && model <= 0x0f; } -static bool is_zen2(uint32_t eax) +static bool is_zen2(uint32_t family, uint32_t model) { - return x86_family(eax) == 0x17 && - x86_model(eax) >= 0x30 && x86_model(eax) <= 0x3f; + return family == 0x17 && model >= 0x30 && model <= 0x3f; } -static bool is_zen3(uint32_t eax) +static bool is_zen3(uint32_t family, uint32_t model) { - return x86_family(eax) == 0x19 && x86_model(eax) <= 0x0f; + return family == 0x19 && model <= 0x0f; } /* @@ -432,13 +394,13 @@ static bool is_zen3(uint32_t eax) */ static bool use_amd_pmu(void) { - const struct kvm_cpuid_entry2 *entry; + uint32_t family = kvm_cpu_family(); + uint32_t model = kvm_cpu_model(); - entry = kvm_get_supported_cpuid_entry(1); return is_amd_cpu() && - (is_zen1(entry->eax) || - is_zen2(entry->eax) || - is_zen3(entry->eax)); + (is_zen1(family, model) || + is_zen2(family, model) || + is_zen3(family, model)); } int main(int argc, char *argv[]) @@ -447,9 +409,6 @@ int main(int argc, char *argv[]) struct kvm_vcpu *vcpu; struct kvm_vm *vm; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - TEST_REQUIRE(kvm_has_cap(KVM_CAP_PMU_EVENT_FILTER)); TEST_REQUIRE(use_intel_pmu() || use_amd_pmu()); diff --git a/tools/testing/selftests/kvm/x86_64/set_sregs_test.c b/tools/testing/selftests/kvm/x86_64/set_sregs_test.c index 2bb08bf2125d..a284fcef6ed7 100644 --- a/tools/testing/selftests/kvm/x86_64/set_sregs_test.c +++ b/tools/testing/selftests/kvm/x86_64/set_sregs_test.c @@ -82,9 +82,6 @@ int main(int argc, char *argv[]) uint64_t cr4; int rc; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - /* * Create a dummy VM, specifically to avoid doing KVM_SET_CPUID2, and * use it to verify all supported CR4 bits can be set prior to defining diff --git a/tools/testing/selftests/kvm/x86_64/smaller_maxphyaddr_emulation_test.c b/tools/testing/selftests/kvm/x86_64/smaller_maxphyaddr_emulation_test.c new file mode 100644 index 000000000000..06edf00a97d6 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/smaller_maxphyaddr_emulation_test.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020, Google LLC. + * + * Test that KVM emulates instructions in response to EPT violations when + * allow_smaller_maxphyaddr is enabled and guest.MAXPHYADDR < host.MAXPHYADDR. + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ + +#include "flds_emulation.h" + +#include "test_util.h" +#include "kvm_util.h" +#include "vmx.h" + +#define MAXPHYADDR 36 + +#define MEM_REGION_GVA 0x0000123456789000 +#define MEM_REGION_GPA 0x0000000700000000 +#define MEM_REGION_SLOT 10 +#define MEM_REGION_SIZE PAGE_SIZE + +static void guest_code(bool tdp_enabled) +{ + uint64_t error_code; + uint64_t vector; + + vector = kvm_asm_safe_ec(FLDS_MEM_EAX, error_code, "a"(MEM_REGION_GVA)); + + /* + * When TDP is enabled, flds will trigger an emulation failure, exit to + * userspace, and then the selftest host "VMM" skips the instruction. + * + * When TDP is disabled, no instruction emulation is required so flds + * should generate #PF(RSVD). + */ + if (tdp_enabled) { + GUEST_ASSERT(!vector); + } else { + GUEST_ASSERT_EQ(vector, PF_VECTOR); + GUEST_ASSERT(error_code & PFERR_RSVD_MASK); + } + + GUEST_DONE(); +} + +int main(int argc, char *argv[]) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + struct ucall uc; + uint64_t *pte; + uint64_t *hva; + uint64_t gpa; + int rc; + + TEST_REQUIRE(kvm_has_cap(KVM_CAP_SMALLER_MAXPHYADDR)); + + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + vcpu_args_set(vcpu, 1, kvm_is_tdp_enabled()); + + vm_init_descriptor_tables(vm); + vcpu_init_descriptor_tables(vcpu); + + vcpu_set_cpuid_maxphyaddr(vcpu, MAXPHYADDR); + + rc = kvm_check_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE); + TEST_ASSERT(rc, "KVM_CAP_EXIT_ON_EMULATION_FAILURE is unavailable"); + vm_enable_cap(vm, KVM_CAP_EXIT_ON_EMULATION_FAILURE, 1); + + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, + MEM_REGION_GPA, MEM_REGION_SLOT, + MEM_REGION_SIZE / PAGE_SIZE, 0); + gpa = vm_phy_pages_alloc(vm, MEM_REGION_SIZE / PAGE_SIZE, + MEM_REGION_GPA, MEM_REGION_SLOT); + TEST_ASSERT(gpa == MEM_REGION_GPA, "Failed vm_phy_pages_alloc\n"); + virt_map(vm, MEM_REGION_GVA, MEM_REGION_GPA, 1); + hva = addr_gpa2hva(vm, MEM_REGION_GPA); + memset(hva, 0, PAGE_SIZE); + + pte = vm_get_page_table_entry(vm, MEM_REGION_GVA); + *pte |= BIT_ULL(MAXPHYADDR); + + vcpu_run(vcpu); + + /* + * When TDP is enabled, KVM must emulate in response the guest physical + * address that is illegal from the guest's perspective, but is legal + * from hardware's perspeective. This should result in an emulation + * failure exit to userspace since KVM doesn't support emulating flds. + */ + if (kvm_is_tdp_enabled()) { + handle_flds_emulation_failure_exit(vcpu); + vcpu_run(vcpu); + } + + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + break; + case UCALL_DONE: + break; + default: + TEST_FAIL("Unrecognized ucall: %lu\n", uc.cmd); + } + + kvm_vm_free(vm); + + return 0; +} diff --git a/tools/testing/selftests/kvm/x86_64/smm_test.c b/tools/testing/selftests/kvm/x86_64/smm_test.c index 1f136a81858e..cb38a478e1f6 100644 --- a/tools/testing/selftests/kvm/x86_64/smm_test.c +++ b/tools/testing/selftests/kvm/x86_64/smm_test.c @@ -137,6 +137,8 @@ int main(int argc, char *argv[]) struct kvm_x86_state *state; int stage, stage_reported; + TEST_REQUIRE(kvm_has_cap(KVM_CAP_X86_SMM)); + /* Create VM */ vm = vm_create_with_one_vcpu(&vcpu, guest_code); diff --git a/tools/testing/selftests/kvm/x86_64/svm_nested_soft_inject_test.c b/tools/testing/selftests/kvm/x86_64/svm_nested_soft_inject_test.c index e637d7736012..e497ace629c1 100644 --- a/tools/testing/selftests/kvm/x86_64/svm_nested_soft_inject_test.c +++ b/tools/testing/selftests/kvm/x86_64/svm_nested_soft_inject_test.c @@ -194,9 +194,6 @@ done: int main(int argc, char *argv[]) { - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM)); TEST_ASSERT(kvm_cpu_has(X86_FEATURE_NRIPS), diff --git a/tools/testing/selftests/kvm/x86_64/sync_regs_test.c b/tools/testing/selftests/kvm/x86_64/sync_regs_test.c index 9b6db0b0b13e..d2f9b5bdfab2 100644 --- a/tools/testing/selftests/kvm/x86_64/sync_regs_test.c +++ b/tools/testing/selftests/kvm/x86_64/sync_regs_test.c @@ -90,9 +90,6 @@ int main(int argc, char *argv[]) struct kvm_vcpu_events events; int rv, cap; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - cap = kvm_check_cap(KVM_CAP_SYNC_REGS); TEST_REQUIRE((cap & TEST_SYNC_FIELDS) == TEST_SYNC_FIELDS); TEST_REQUIRE(!(cap & INVALID_SYNC_FIELD)); diff --git a/tools/testing/selftests/kvm/x86_64/userspace_io_test.c b/tools/testing/selftests/kvm/x86_64/userspace_io_test.c index 7316521428f8..91076c9787b4 100644 --- a/tools/testing/selftests/kvm/x86_64/userspace_io_test.c +++ b/tools/testing/selftests/kvm/x86_64/userspace_io_test.c @@ -56,9 +56,6 @@ int main(int argc, char *argv[]) struct kvm_vm *vm; struct ucall uc; - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); - vm = vm_create_with_one_vcpu(&vcpu, guest_code); run = vcpu->run; diff --git a/tools/testing/selftests/kvm/x86_64/userspace_msr_exit_test.c b/tools/testing/selftests/kvm/x86_64/userspace_msr_exit_test.c index a4f06370a245..25fa55344a10 100644 --- a/tools/testing/selftests/kvm/x86_64/userspace_msr_exit_test.c +++ b/tools/testing/selftests/kvm/x86_64/userspace_msr_exit_test.c @@ -733,16 +733,98 @@ static void test_msr_permission_bitmap(void) kvm_vm_free(vm); } -int main(int argc, char *argv[]) +#define test_user_exit_msr_ioctl(vm, cmd, arg, flag, valid_mask) \ +({ \ + int r = __vm_ioctl(vm, cmd, arg); \ + \ + if (flag & valid_mask) \ + TEST_ASSERT(!r, __KVM_IOCTL_ERROR(#cmd, r)); \ + else \ + TEST_ASSERT(r == -1 && errno == EINVAL, \ + "Wanted EINVAL for %s with flag = 0x%llx, got rc: %i errno: %i (%s)", \ + #cmd, flag, r, errno, strerror(errno)); \ +}) + +static void run_user_space_msr_flag_test(struct kvm_vm *vm) { - /* Tell stdout not to buffer its content */ - setbuf(stdout, NULL); + struct kvm_enable_cap cap = { .cap = KVM_CAP_X86_USER_SPACE_MSR }; + int nflags = sizeof(cap.args[0]) * BITS_PER_BYTE; + int rc; + int i; + + rc = kvm_check_cap(KVM_CAP_X86_USER_SPACE_MSR); + TEST_ASSERT(rc, "KVM_CAP_X86_USER_SPACE_MSR is available"); + + for (i = 0; i < nflags; i++) { + cap.args[0] = BIT_ULL(i); + test_user_exit_msr_ioctl(vm, KVM_ENABLE_CAP, &cap, + BIT_ULL(i), KVM_MSR_EXIT_REASON_VALID_MASK); + } +} + +static void run_msr_filter_flag_test(struct kvm_vm *vm) +{ + u64 deny_bits = 0; + struct kvm_msr_filter filter = { + .flags = KVM_MSR_FILTER_DEFAULT_ALLOW, + .ranges = { + { + .flags = KVM_MSR_FILTER_READ, + .nmsrs = 1, + .base = 0, + .bitmap = (uint8_t *)&deny_bits, + }, + }, + }; + int nflags; + int rc; + int i; + + rc = kvm_check_cap(KVM_CAP_X86_MSR_FILTER); + TEST_ASSERT(rc, "KVM_CAP_X86_MSR_FILTER is available"); + + nflags = sizeof(filter.flags) * BITS_PER_BYTE; + for (i = 0; i < nflags; i++) { + filter.flags = BIT_ULL(i); + test_user_exit_msr_ioctl(vm, KVM_X86_SET_MSR_FILTER, &filter, + BIT_ULL(i), KVM_MSR_FILTER_VALID_MASK); + } + filter.flags = KVM_MSR_FILTER_DEFAULT_ALLOW; + nflags = sizeof(filter.ranges[0].flags) * BITS_PER_BYTE; + for (i = 0; i < nflags; i++) { + filter.ranges[0].flags = BIT_ULL(i); + test_user_exit_msr_ioctl(vm, KVM_X86_SET_MSR_FILTER, &filter, + BIT_ULL(i), KVM_MSR_FILTER_RANGE_VALID_MASK); + } +} + +/* Test that attempts to write to the unused bits in a flag fails. */ +static void test_user_exit_msr_flags(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + vm = vm_create_with_one_vcpu(&vcpu, NULL); + + /* Test flags for KVM_CAP_X86_USER_SPACE_MSR. */ + run_user_space_msr_flag_test(vm); + + /* Test flags and range flags for KVM_X86_SET_MSR_FILTER. */ + run_msr_filter_flag_test(vm); + + kvm_vm_free(vm); +} + +int main(int argc, char *argv[]) +{ test_msr_filter_allow(); test_msr_filter_deny(); test_msr_permission_bitmap(); + test_user_exit_msr_flags(); + return 0; } diff --git a/tools/testing/selftests/kvm/x86_64/vmx_dirty_log_test.c b/tools/testing/selftests/kvm/x86_64/vmx_dirty_log_test.c index 2d8c23d639f7..f0456fb031b1 100644 --- a/tools/testing/selftests/kvm/x86_64/vmx_dirty_log_test.c +++ b/tools/testing/selftests/kvm/x86_64/vmx_dirty_log_test.c @@ -78,6 +78,7 @@ int main(int argc, char *argv[]) bool done = false; TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX)); + TEST_REQUIRE(kvm_cpu_has_ept()); /* Create VM */ vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code); diff --git a/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c b/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c index 322d561b4260..90720b6205f4 100644 --- a/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c +++ b/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c @@ -67,6 +67,52 @@ static void vmx_save_restore_msrs_test(struct kvm_vcpu *vcpu) vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_VMFUNC, -1ull); } +static void __ia32_feature_control_msr_test(struct kvm_vcpu *vcpu, + uint64_t msr_bit, + struct kvm_x86_cpu_feature feature) +{ + uint64_t val; + + vcpu_clear_cpuid_feature(vcpu, feature); + + val = vcpu_get_msr(vcpu, MSR_IA32_FEAT_CTL); + vcpu_set_msr(vcpu, MSR_IA32_FEAT_CTL, val | msr_bit | FEAT_CTL_LOCKED); + vcpu_set_msr(vcpu, MSR_IA32_FEAT_CTL, (val & ~msr_bit) | FEAT_CTL_LOCKED); + vcpu_set_msr(vcpu, MSR_IA32_FEAT_CTL, val | msr_bit | FEAT_CTL_LOCKED); + vcpu_set_msr(vcpu, MSR_IA32_FEAT_CTL, (val & ~msr_bit) | FEAT_CTL_LOCKED); + vcpu_set_msr(vcpu, MSR_IA32_FEAT_CTL, val); + + if (!kvm_cpu_has(feature)) + return; + + vcpu_set_cpuid_feature(vcpu, feature); +} + +static void ia32_feature_control_msr_test(struct kvm_vcpu *vcpu) +{ + uint64_t supported_bits = FEAT_CTL_LOCKED | + FEAT_CTL_VMX_ENABLED_INSIDE_SMX | + FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX | + FEAT_CTL_SGX_LC_ENABLED | + FEAT_CTL_SGX_ENABLED | + FEAT_CTL_LMCE_ENABLED; + int bit, r; + + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_VMX_ENABLED_INSIDE_SMX, X86_FEATURE_SMX); + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_VMX_ENABLED_INSIDE_SMX, X86_FEATURE_VMX); + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX, X86_FEATURE_VMX); + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_SGX_LC_ENABLED, X86_FEATURE_SGX_LC); + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_SGX_LC_ENABLED, X86_FEATURE_SGX); + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_SGX_ENABLED, X86_FEATURE_SGX); + __ia32_feature_control_msr_test(vcpu, FEAT_CTL_LMCE_ENABLED, X86_FEATURE_MCE); + + for_each_clear_bit(bit, &supported_bits, 64) { + r = _vcpu_set_msr(vcpu, MSR_IA32_FEAT_CTL, BIT(bit)); + TEST_ASSERT(r == 0, + "Setting reserved bit %d in IA32_FEATURE_CONTROL should fail", bit); + } +} + int main(void) { struct kvm_vcpu *vcpu; @@ -79,6 +125,7 @@ int main(void) vm = vm_create_with_one_vcpu(&vcpu, NULL); vmx_save_restore_msrs_test(vcpu); + ia32_feature_control_msr_test(vcpu); kvm_vm_free(vm); } diff --git a/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c b/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c index 069589c52f41..c280ba1e6572 100644 --- a/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c +++ b/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c @@ -20,16 +20,6 @@ #define PMU_CAP_FW_WRITES (1ULL << 13) #define PMU_CAP_LBR_FMT 0x3f -union cpuid10_eax { - struct { - unsigned int version_id:8; - unsigned int num_counters:8; - unsigned int bit_width:8; - unsigned int mask_length:8; - } split; - unsigned int full; -}; - union perf_capabilities { struct { u64 lbr_format:6; @@ -53,11 +43,9 @@ static void guest_code(void) int main(int argc, char *argv[]) { - const struct kvm_cpuid_entry2 *entry_a_0; struct kvm_vm *vm; struct kvm_vcpu *vcpu; int ret; - union cpuid10_eax eax; union perf_capabilities host_cap; uint64_t val; @@ -69,11 +57,8 @@ int main(int argc, char *argv[]) TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_PDCM)); - TEST_REQUIRE(kvm_get_cpuid_max_basic() >= 0xa); - entry_a_0 = kvm_get_supported_cpuid_entry(0xa); - - eax.full = entry_a_0->eax; - __TEST_REQUIRE(eax.split.version_id, "PMU is not supported by the vCPU"); + TEST_REQUIRE(kvm_cpu_has_p(X86_PROPERTY_PMU_VERSION)); + TEST_REQUIRE(kvm_cpu_property(X86_PROPERTY_PMU_VERSION) > 0); /* testcase 1, set capabilities when we have PDCM bit */ vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, PMU_CAP_FW_WRITES); diff --git a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c index 6f7a5ef66718..d7d37dae3eeb 100644 --- a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c +++ b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c @@ -114,7 +114,9 @@ static void test_icr(struct xapic_vcpu *x) * vCPUs, not vcpu.id + 1. Arbitrarily use vector 0xff. */ icr = APIC_INT_ASSERT | 0xff; - for (i = vcpu->id + 1; i < 0xff; i++) { + for (i = 0; i < 0xff; i++) { + if (i == vcpu->id) + continue; for (j = 0; j < 8; j++) __test_icr(x, i << (32 + 24) | icr | (j << 8)); } diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c index 2a5727188c8d..721f6a693799 100644 --- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c +++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c @@ -26,17 +26,17 @@ #define SHINFO_REGION_GPA 0xc0000000ULL #define SHINFO_REGION_SLOT 10 -#define DUMMY_REGION_GPA (SHINFO_REGION_GPA + (2 * PAGE_SIZE)) +#define DUMMY_REGION_GPA (SHINFO_REGION_GPA + (3 * PAGE_SIZE)) #define DUMMY_REGION_SLOT 11 #define SHINFO_ADDR (SHINFO_REGION_GPA) -#define PVTIME_ADDR (SHINFO_REGION_GPA + PAGE_SIZE) -#define RUNSTATE_ADDR (SHINFO_REGION_GPA + PAGE_SIZE + 0x20) #define VCPU_INFO_ADDR (SHINFO_REGION_GPA + 0x40) +#define PVTIME_ADDR (SHINFO_REGION_GPA + PAGE_SIZE) +#define RUNSTATE_ADDR (SHINFO_REGION_GPA + PAGE_SIZE + PAGE_SIZE - 15) #define SHINFO_VADDR (SHINFO_REGION_GVA) -#define RUNSTATE_VADDR (SHINFO_REGION_GVA + PAGE_SIZE + 0x20) #define VCPU_INFO_VADDR (SHINFO_REGION_GVA + 0x40) +#define RUNSTATE_VADDR (SHINFO_REGION_GVA + PAGE_SIZE + PAGE_SIZE - 15) #define EVTCHN_VECTOR 0x10 @@ -88,14 +88,20 @@ struct pvclock_wall_clock { } __attribute__((__packed__)); struct vcpu_runstate_info { - uint32_t state; - uint64_t state_entry_time; - uint64_t time[4]; + uint32_t state; + uint64_t state_entry_time; + uint64_t time[5]; /* Extra field for overrun check */ }; +struct compat_vcpu_runstate_info { + uint32_t state; + uint64_t state_entry_time; + uint64_t time[5]; +} __attribute__((__packed__));; + struct arch_vcpu_info { - unsigned long cr2; - unsigned long pad; /* sizeof(vcpu_info_t) == 64 */ + unsigned long cr2; + unsigned long pad; /* sizeof(vcpu_info_t) == 64 */ }; struct vcpu_info { @@ -440,6 +446,7 @@ int main(int argc, char *argv[]) TEST_REQUIRE(xen_caps & KVM_XEN_HVM_CONFIG_SHARED_INFO); bool do_runstate_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE); + bool do_runstate_flag = !!(xen_caps & KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG); bool do_eventfd_tests = !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL); bool do_evtchn_tests = do_eventfd_tests && !!(xen_caps & KVM_XEN_HVM_CONFIG_EVTCHN_SEND); @@ -449,8 +456,8 @@ int main(int argc, char *argv[]) /* Map a region for the shared_info page */ vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, - SHINFO_REGION_GPA, SHINFO_REGION_SLOT, 2, 0); - virt_map(vm, SHINFO_REGION_GVA, SHINFO_REGION_GPA, 2); + SHINFO_REGION_GPA, SHINFO_REGION_SLOT, 3, 0); + virt_map(vm, SHINFO_REGION_GVA, SHINFO_REGION_GPA, 3); struct shared_info *shinfo = addr_gpa2hva(vm, SHINFO_VADDR); @@ -475,6 +482,19 @@ int main(int argc, char *argv[]) }; vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm); + if (do_runstate_flag) { + struct kvm_xen_hvm_attr ruf = { + .type = KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG, + .u.runstate_update_flag = 1, + }; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ruf); + + ruf.u.runstate_update_flag = 0; + vm_ioctl(vm, KVM_XEN_HVM_GET_ATTR, &ruf); + TEST_ASSERT(ruf.u.runstate_update_flag == 1, + "Failed to read back RUNSTATE_UPDATE_FLAG attr"); + } + struct kvm_xen_hvm_attr ha = { .type = KVM_XEN_ATTR_TYPE_SHARED_INFO, .u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE, @@ -999,22 +1019,91 @@ int main(int argc, char *argv[]) runstate_names[i], rs->time[i]); } } - TEST_ASSERT(rs->state == rst.u.runstate.state, "Runstate mismatch"); - TEST_ASSERT(rs->state_entry_time == rst.u.runstate.state_entry_time, - "State entry time mismatch"); - TEST_ASSERT(rs->time[RUNSTATE_running] == rst.u.runstate.time_running, - "Running time mismatch"); - TEST_ASSERT(rs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable, - "Runnable time mismatch"); - TEST_ASSERT(rs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked, - "Blocked time mismatch"); - TEST_ASSERT(rs->time[RUNSTATE_offline] == rst.u.runstate.time_offline, - "Offline time mismatch"); - - TEST_ASSERT(rs->state_entry_time == rs->time[0] + - rs->time[1] + rs->time[2] + rs->time[3], - "runstate times don't add up"); + + /* + * Exercise runstate info at all points across the page boundary, in + * 32-bit and 64-bit mode. In particular, test the case where it is + * configured in 32-bit mode and then switched to 64-bit mode while + * active, which takes it onto the second page. + */ + unsigned long runstate_addr; + struct compat_vcpu_runstate_info *crs; + for (runstate_addr = SHINFO_REGION_GPA + PAGE_SIZE + PAGE_SIZE - sizeof(*rs) - 4; + runstate_addr < SHINFO_REGION_GPA + PAGE_SIZE + PAGE_SIZE + 4; runstate_addr++) { + + rs = addr_gpa2hva(vm, runstate_addr); + crs = (void *)rs; + + memset(rs, 0xa5, sizeof(*rs)); + + /* Set to compatibility mode */ + lm.u.long_mode = 0; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm); + + /* Set runstate to new address (kernel will write it) */ + struct kvm_xen_vcpu_attr st = { + .type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADDR, + .u.gpa = runstate_addr, + }; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &st); + + if (verbose) + printf("Compatibility runstate at %08lx\n", runstate_addr); + + TEST_ASSERT(crs->state == rst.u.runstate.state, "Runstate mismatch"); + TEST_ASSERT(crs->state_entry_time == rst.u.runstate.state_entry_time, + "State entry time mismatch"); + TEST_ASSERT(crs->time[RUNSTATE_running] == rst.u.runstate.time_running, + "Running time mismatch"); + TEST_ASSERT(crs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable, + "Runnable time mismatch"); + TEST_ASSERT(crs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked, + "Blocked time mismatch"); + TEST_ASSERT(crs->time[RUNSTATE_offline] == rst.u.runstate.time_offline, + "Offline time mismatch"); + TEST_ASSERT(crs->time[RUNSTATE_offline + 1] == 0xa5a5a5a5a5a5a5a5ULL, + "Structure overrun"); + TEST_ASSERT(crs->state_entry_time == crs->time[0] + + crs->time[1] + crs->time[2] + crs->time[3], + "runstate times don't add up"); + + + /* Now switch to 64-bit mode */ + lm.u.long_mode = 1; + vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm); + + memset(rs, 0xa5, sizeof(*rs)); + + /* Don't change the address, just trigger a write */ + struct kvm_xen_vcpu_attr adj = { + .type = KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST, + .u.runstate.state = (uint64_t)-1 + }; + vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &adj); + + if (verbose) + printf("64-bit runstate at %08lx\n", runstate_addr); + + TEST_ASSERT(rs->state == rst.u.runstate.state, "Runstate mismatch"); + TEST_ASSERT(rs->state_entry_time == rst.u.runstate.state_entry_time, + "State entry time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_running] == rst.u.runstate.time_running, + "Running time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_runnable] == rst.u.runstate.time_runnable, + "Runnable time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_blocked] == rst.u.runstate.time_blocked, + "Blocked time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_offline] == rst.u.runstate.time_offline, + "Offline time mismatch"); + TEST_ASSERT(rs->time[RUNSTATE_offline + 1] == 0xa5a5a5a5a5a5a5a5ULL, + "Structure overrun"); + + TEST_ASSERT(rs->state_entry_time == rs->time[0] + + rs->time[1] + rs->time[2] + rs->time[3], + "runstate times don't add up"); + } } + kvm_vm_free(vm); return 0; } diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 800f9470e36b..9fb1ff6f19e5 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -33,6 +33,12 @@ config HAVE_KVM_DIRTY_RING_ACQ_REL bool select HAVE_KVM_DIRTY_RING +# Allow enabling both the dirty bitmap and dirty ring. Only architectures +# that need to dirty memory outside of a vCPU context should select this. +config NEED_KVM_DIRTY_RING_WITH_BITMAP + bool + depends on HAVE_KVM_DIRTY_RING + config HAVE_KVM_EVENTFD bool select EVENTFD diff --git a/virt/kvm/dirty_ring.c b/virt/kvm/dirty_ring.c index d6fabf238032..c1cd7dfe4a90 100644 --- a/virt/kvm/dirty_ring.c +++ b/virt/kvm/dirty_ring.c @@ -21,12 +21,26 @@ u32 kvm_dirty_ring_get_rsvd_entries(void) return KVM_DIRTY_RING_RSVD_ENTRIES + kvm_cpu_dirty_log_size(); } +bool kvm_use_dirty_bitmap(struct kvm *kvm) +{ + lockdep_assert_held(&kvm->slots_lock); + + return !kvm->dirty_ring_size || kvm->dirty_ring_with_bitmap; +} + +#ifndef CONFIG_NEED_KVM_DIRTY_RING_WITH_BITMAP +bool kvm_arch_allow_write_without_running_vcpu(struct kvm *kvm) +{ + return false; +} +#endif + static u32 kvm_dirty_ring_used(struct kvm_dirty_ring *ring) { return READ_ONCE(ring->dirty_index) - READ_ONCE(ring->reset_index); } -bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring) +static bool kvm_dirty_ring_soft_full(struct kvm_dirty_ring *ring) { return kvm_dirty_ring_used(ring) >= ring->soft_limit; } @@ -142,13 +156,19 @@ int kvm_dirty_ring_reset(struct kvm *kvm, struct kvm_dirty_ring *ring) kvm_reset_dirty_gfn(kvm, cur_slot, cur_offset, mask); + /* + * The request KVM_REQ_DIRTY_RING_SOFT_FULL will be cleared + * by the VCPU thread next time when it enters the guest. + */ + trace_kvm_dirty_ring_reset(ring); return count; } -void kvm_dirty_ring_push(struct kvm_dirty_ring *ring, u32 slot, u64 offset) +void kvm_dirty_ring_push(struct kvm_vcpu *vcpu, u32 slot, u64 offset) { + struct kvm_dirty_ring *ring = &vcpu->dirty_ring; struct kvm_dirty_gfn *entry; /* It should never get full */ @@ -166,6 +186,28 @@ void kvm_dirty_ring_push(struct kvm_dirty_ring *ring, u32 slot, u64 offset) kvm_dirty_gfn_set_dirtied(entry); ring->dirty_index++; trace_kvm_dirty_ring_push(ring, slot, offset); + + if (kvm_dirty_ring_soft_full(ring)) + kvm_make_request(KVM_REQ_DIRTY_RING_SOFT_FULL, vcpu); +} + +bool kvm_dirty_ring_check_request(struct kvm_vcpu *vcpu) +{ + /* + * The VCPU isn't runnable when the dirty ring becomes soft full. + * The KVM_REQ_DIRTY_RING_SOFT_FULL event is always set to prevent + * the VCPU from running until the dirty pages are harvested and + * the dirty ring is reset by userspace. + */ + if (kvm_check_request(KVM_REQ_DIRTY_RING_SOFT_FULL, vcpu) && + kvm_dirty_ring_soft_full(&vcpu->dirty_ring)) { + kvm_make_request(KVM_REQ_DIRTY_RING_SOFT_FULL, vcpu); + vcpu->run->exit_reason = KVM_EXIT_DIRTY_RING_FULL; + trace_kvm_dirty_ring_exit(vcpu); + return true; + } + + return false; } struct page *kvm_dirty_ring_get_page(struct kvm_dirty_ring *ring, u32 offset) diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c index 58e4f88b2b9f..1e567d1f6d3d 100644 --- a/virt/kvm/irqchip.c +++ b/virt/kvm/irqchip.c @@ -17,7 +17,6 @@ #include <linux/srcu.h> #include <linux/export.h> #include <trace/events/kvm.h> -#include "irq.h" int kvm_irq_map_gsi(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *entries, int gsi) @@ -50,7 +49,7 @@ int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) { struct kvm_kernel_irq_routing_entry route; - if (!irqchip_in_kernel(kvm) || (msi->flags & ~KVM_MSI_VALID_DEVID)) + if (!kvm_arch_irqchip_in_kernel(kvm) || (msi->flags & ~KVM_MSI_VALID_DEVID)) return -EINVAL; route.msi.address_lo = msi->address_lo; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index fab4d3790578..13e88297f999 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1615,7 +1615,7 @@ static int kvm_prepare_memory_region(struct kvm *kvm, new->dirty_bitmap = NULL; else if (old && old->dirty_bitmap) new->dirty_bitmap = old->dirty_bitmap; - else if (!kvm->dirty_ring_size) { + else if (kvm_use_dirty_bitmap(kvm)) { r = kvm_alloc_dirty_bitmap(new); if (r) return r; @@ -1639,6 +1639,8 @@ static void kvm_commit_memory_region(struct kvm *kvm, const struct kvm_memory_slot *new, enum kvm_mr_change change) { + int old_flags = old ? old->flags : 0; + int new_flags = new ? new->flags : 0; /* * Update the total number of memslot pages before calling the arch * hook so that architectures can consume the result directly. @@ -1648,6 +1650,12 @@ static void kvm_commit_memory_region(struct kvm *kvm, else if (change == KVM_MR_CREATE) kvm->nr_memslot_pages += new->npages; + if ((old_flags ^ new_flags) & KVM_MEM_LOG_DIRTY_PAGES) { + int change = (new_flags & KVM_MEM_LOG_DIRTY_PAGES) ? 1 : -1; + atomic_set(&kvm->nr_memslots_dirty_logging, + atomic_read(&kvm->nr_memslots_dirty_logging) + change); + } + kvm_arch_commit_memory_region(kvm, old, new, change); switch (change) { @@ -2058,8 +2066,8 @@ int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log, unsigned long n; unsigned long any = 0; - /* Dirty ring tracking is exclusive to dirty log tracking */ - if (kvm->dirty_ring_size) + /* Dirty ring tracking may be exclusive to dirty log tracking */ + if (!kvm_use_dirty_bitmap(kvm)) return -ENXIO; *memslot = NULL; @@ -2123,8 +2131,8 @@ static int kvm_get_dirty_log_protect(struct kvm *kvm, struct kvm_dirty_log *log) unsigned long *dirty_bitmap_buffer; bool flush; - /* Dirty ring tracking is exclusive to dirty log tracking */ - if (kvm->dirty_ring_size) + /* Dirty ring tracking may be exclusive to dirty log tracking */ + if (!kvm_use_dirty_bitmap(kvm)) return -ENXIO; as_id = log->slot >> 16; @@ -2235,8 +2243,8 @@ static int kvm_clear_dirty_log_protect(struct kvm *kvm, unsigned long *dirty_bitmap_buffer; bool flush; - /* Dirty ring tracking is exclusive to dirty log tracking */ - if (kvm->dirty_ring_size) + /* Dirty ring tracking may be exclusive to dirty log tracking */ + if (!kvm_use_dirty_bitmap(kvm)) return -ENXIO; as_id = log->slot >> 16; @@ -2512,7 +2520,7 @@ static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, * 1 indicates success, -errno is returned if error is detected. */ static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, - bool *writable, kvm_pfn_t *pfn) + bool interruptible, bool *writable, kvm_pfn_t *pfn) { unsigned int flags = FOLL_HWPOISON; struct page *page; @@ -2527,6 +2535,8 @@ static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, flags |= FOLL_WRITE; if (async) flags |= FOLL_NOWAIT; + if (interruptible) + flags |= FOLL_INTERRUPTIBLE; npages = get_user_pages_unlocked(addr, 1, &page, flags); if (npages != 1) @@ -2636,6 +2646,7 @@ out: * Pin guest page in memory and return its pfn. * @addr: host virtual address which maps memory to the guest * @atomic: whether this function can sleep + * @interruptible: whether the process can be interrupted by non-fatal signals * @async: whether this function need to wait IO complete if the * host page is not in the memory * @write_fault: whether we should get a writable host page @@ -2646,8 +2657,8 @@ out: * 2): @write_fault = false && @writable, @writable will tell the caller * whether the mapping is writable. */ -kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, - bool write_fault, bool *writable) +kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible, + bool *async, bool write_fault, bool *writable) { struct vm_area_struct *vma; kvm_pfn_t pfn; @@ -2662,9 +2673,12 @@ kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, if (atomic) return KVM_PFN_ERR_FAULT; - npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); + npages = hva_to_pfn_slow(addr, async, write_fault, interruptible, + writable, &pfn); if (npages == 1) return pfn; + if (npages == -EINTR) + return KVM_PFN_ERR_SIGPENDING; mmap_read_lock(current->mm); if (npages == -EHWPOISON || @@ -2695,8 +2709,8 @@ exit: } kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn, - bool atomic, bool *async, bool write_fault, - bool *writable, hva_t *hva) + bool atomic, bool interruptible, bool *async, + bool write_fault, bool *writable, hva_t *hva) { unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); @@ -2721,7 +2735,7 @@ kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn, writable = NULL; } - return hva_to_pfn(addr, atomic, async, write_fault, + return hva_to_pfn(addr, atomic, interruptible, async, write_fault, writable); } EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); @@ -2729,20 +2743,22 @@ EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, bool *writable) { - return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, - write_fault, writable, NULL); + return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, false, + NULL, write_fault, writable, NULL); } EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); kvm_pfn_t gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn) { - return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL, NULL); + return __gfn_to_pfn_memslot(slot, gfn, false, false, NULL, true, + NULL, NULL); } EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); kvm_pfn_t gfn_to_pfn_memslot_atomic(const struct kvm_memory_slot *slot, gfn_t gfn) { - return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL, NULL); + return __gfn_to_pfn_memslot(slot, gfn, true, false, NULL, true, + NULL, NULL); } EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); @@ -3303,18 +3319,19 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); #ifdef CONFIG_HAVE_KVM_DIRTY_RING - if (WARN_ON_ONCE(!vcpu) || WARN_ON_ONCE(vcpu->kvm != kvm)) + if (WARN_ON_ONCE(vcpu && vcpu->kvm != kvm)) return; + + WARN_ON_ONCE(!vcpu && !kvm_arch_allow_write_without_running_vcpu(kvm)); #endif if (memslot && kvm_slot_dirty_track_enabled(memslot)) { unsigned long rel_gfn = gfn - memslot->base_gfn; u32 slot = (memslot->as_id << 16) | memslot->id; - if (kvm->dirty_ring_size) - kvm_dirty_ring_push(&vcpu->dirty_ring, - slot, rel_gfn); - else + if (kvm->dirty_ring_size && vcpu) + kvm_dirty_ring_push(vcpu, slot, rel_gfn); + else if (memslot->dirty_bitmap) set_bit_le(rel_gfn, memslot->dirty_bitmap); } } @@ -3521,10 +3538,6 @@ void kvm_vcpu_halt(struct kvm_vcpu *vcpu) ktime_t stop = ktime_add_ns(start, vcpu->halt_poll_ns); do { - /* - * This sets KVM_REQ_UNHALT if an interrupt - * arrives. - */ if (kvm_vcpu_check_block(vcpu) < 0) goto out; cpu_relax(); @@ -4506,6 +4519,9 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) #else return 0; #endif +#ifdef CONFIG_NEED_KVM_DIRTY_RING_WITH_BITMAP + case KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP: +#endif case KVM_CAP_BINARY_STATS_FD: case KVM_CAP_SYSTEM_EVENT_DATA: return 1; @@ -4581,6 +4597,20 @@ int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm, return -EINVAL; } +static bool kvm_are_all_memslots_empty(struct kvm *kvm) +{ + int i; + + lockdep_assert_held(&kvm->slots_lock); + + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + if (!kvm_memslots_empty(__kvm_memslots(kvm, i))) + return false; + } + + return true; +} + static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, struct kvm_enable_cap *cap) { @@ -4621,6 +4651,29 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, return -EINVAL; return kvm_vm_ioctl_enable_dirty_log_ring(kvm, cap->args[0]); + case KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP: { + int r = -EINVAL; + + if (!IS_ENABLED(CONFIG_NEED_KVM_DIRTY_RING_WITH_BITMAP) || + !kvm->dirty_ring_size || cap->flags) + return r; + + mutex_lock(&kvm->slots_lock); + + /* + * For simplicity, allow enabling ring+bitmap if and only if + * there are no memslots, e.g. to ensure all memslots allocate + * a bitmap after the capability is enabled. + */ + if (kvm_are_all_memslots_empty(kvm)) { + kvm->dirty_ring_with_bitmap = true; + r = 0; + } + + mutex_unlock(&kvm->slots_lock); + + return r; + } default: return kvm_vm_ioctl_enable_cap(kvm, cap); } diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h index 41da467d99c9..a1ab15006af3 100644 --- a/virt/kvm/kvm_mm.h +++ b/virt/kvm/kvm_mm.h @@ -24,8 +24,8 @@ #define KVM_MMU_READ_UNLOCK(kvm) spin_unlock(&(kvm)->mmu_lock) #endif /* KVM_HAVE_MMU_RWLOCK */ -kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, - bool write_fault, bool *writable); +kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible, + bool *async, bool write_fault, bool *writable); #ifdef CONFIG_HAVE_KVM_PFNCACHE void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c index 7c248193ca26..2d6aba677830 100644 --- a/virt/kvm/pfncache.c +++ b/virt/kvm/pfncache.c @@ -76,19 +76,17 @@ void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, unsigned long start, } } -bool kvm_gfn_to_pfn_cache_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, - gpa_t gpa, unsigned long len) +bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len) { - struct kvm_memslots *slots = kvm_memslots(kvm); + struct kvm_memslots *slots = kvm_memslots(gpc->kvm); if (!gpc->active) return false; - if ((gpa & ~PAGE_MASK) + len > PAGE_SIZE) + if ((gpc->gpa & ~PAGE_MASK) + len > PAGE_SIZE) return false; - if (gpc->gpa != gpa || gpc->generation != slots->generation || - kvm_is_error_hva(gpc->uhva)) + if (gpc->generation != slots->generation || kvm_is_error_hva(gpc->uhva)) return false; if (!gpc->valid) @@ -96,9 +94,9 @@ bool kvm_gfn_to_pfn_cache_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, return true; } -EXPORT_SYMBOL_GPL(kvm_gfn_to_pfn_cache_check); +EXPORT_SYMBOL_GPL(kvm_gpc_check); -static void gpc_unmap_khva(struct kvm *kvm, kvm_pfn_t pfn, void *khva) +static void gpc_unmap_khva(kvm_pfn_t pfn, void *khva) { /* Unmap the old pfn/page if it was mapped before. */ if (!is_error_noslot_pfn(pfn) && khva) { @@ -139,7 +137,7 @@ static inline bool mmu_notifier_retry_cache(struct kvm *kvm, unsigned long mmu_s return kvm->mmu_invalidate_seq != mmu_seq; } -static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) +static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) { /* Note, the new page offset may be different than the old! */ void *old_khva = gpc->khva - offset_in_page(gpc->khva); @@ -159,7 +157,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) gpc->valid = false; do { - mmu_seq = kvm->mmu_invalidate_seq; + mmu_seq = gpc->kvm->mmu_invalidate_seq; smp_rmb(); write_unlock_irq(&gpc->lock); @@ -177,7 +175,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) * the existing mapping and didn't create a new one. */ if (new_khva != old_khva) - gpc_unmap_khva(kvm, new_pfn, new_khva); + gpc_unmap_khva(new_pfn, new_khva); kvm_release_pfn_clean(new_pfn); @@ -185,7 +183,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) } /* We always request a writeable mapping */ - new_pfn = hva_to_pfn(gpc->uhva, false, NULL, true, NULL); + new_pfn = hva_to_pfn(gpc->uhva, false, false, NULL, true, NULL); if (is_error_noslot_pfn(new_pfn)) goto out_error; @@ -217,7 +215,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) * attempting to refresh. */ WARN_ON_ONCE(gpc->valid); - } while (mmu_notifier_retry_cache(kvm, mmu_seq)); + } while (mmu_notifier_retry_cache(gpc->kvm, mmu_seq)); gpc->valid = true; gpc->pfn = new_pfn; @@ -238,10 +236,10 @@ out_error: return -EFAULT; } -int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, - gpa_t gpa, unsigned long len) +static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, + unsigned long len) { - struct kvm_memslots *slots = kvm_memslots(kvm); + struct kvm_memslots *slots = kvm_memslots(gpc->kvm); unsigned long page_offset = gpa & ~PAGE_MASK; bool unmap_old = false; unsigned long old_uhva; @@ -295,7 +293,7 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, * drop the lock and do the HVA to PFN lookup again. */ if (!gpc->valid || old_uhva != gpc->uhva) { - ret = hva_to_pfn_retry(kvm, gpc); + ret = hva_to_pfn_retry(gpc); } else { /* * If the HVA→PFN mapping was already valid, don't unmap it. @@ -303,9 +301,8 @@ int kvm_gfn_to_pfn_cache_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, * may have changed. */ gpc->khva = old_khva + page_offset; - old_pfn = KVM_PFN_ERR_FAULT; - old_khva = NULL; ret = 0; + goto out_unlock; } out: @@ -329,59 +326,41 @@ out_unlock: mutex_unlock(&gpc->refresh_lock); if (unmap_old) - gpc_unmap_khva(kvm, old_pfn, old_khva); + gpc_unmap_khva(old_pfn, old_khva); return ret; } -EXPORT_SYMBOL_GPL(kvm_gfn_to_pfn_cache_refresh); -void kvm_gfn_to_pfn_cache_unmap(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) +int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len) { - void *old_khva; - kvm_pfn_t old_pfn; - - mutex_lock(&gpc->refresh_lock); - write_lock_irq(&gpc->lock); - - gpc->valid = false; - - old_khva = gpc->khva - offset_in_page(gpc->khva); - old_pfn = gpc->pfn; - - /* - * We can leave the GPA → uHVA map cache intact but the PFN - * lookup will need to be redone even for the same page. - */ - gpc->khva = NULL; - gpc->pfn = KVM_PFN_ERR_FAULT; - - write_unlock_irq(&gpc->lock); - mutex_unlock(&gpc->refresh_lock); - - gpc_unmap_khva(kvm, old_pfn, old_khva); + return __kvm_gpc_refresh(gpc, gpc->gpa, len); } -EXPORT_SYMBOL_GPL(kvm_gfn_to_pfn_cache_unmap); +EXPORT_SYMBOL_GPL(kvm_gpc_refresh); -void kvm_gpc_init(struct gfn_to_pfn_cache *gpc) +void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm, + struct kvm_vcpu *vcpu, enum pfn_cache_usage usage) { + WARN_ON_ONCE(!usage || (usage & KVM_GUEST_AND_HOST_USE_PFN) != usage); + WARN_ON_ONCE((usage & KVM_GUEST_USES_PFN) && !vcpu); + rwlock_init(&gpc->lock); mutex_init(&gpc->refresh_lock); + + gpc->kvm = kvm; + gpc->vcpu = vcpu; + gpc->usage = usage; + gpc->pfn = KVM_PFN_ERR_FAULT; + gpc->uhva = KVM_HVA_ERR_BAD; } EXPORT_SYMBOL_GPL(kvm_gpc_init); -int kvm_gpc_activate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, - struct kvm_vcpu *vcpu, enum pfn_cache_usage usage, - gpa_t gpa, unsigned long len) +int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len) { - WARN_ON_ONCE(!usage || (usage & KVM_GUEST_AND_HOST_USE_PFN) != usage); + struct kvm *kvm = gpc->kvm; if (!gpc->active) { - gpc->khva = NULL; - gpc->pfn = KVM_PFN_ERR_FAULT; - gpc->uhva = KVM_HVA_ERR_BAD; - gpc->vcpu = vcpu; - gpc->usage = usage; - gpc->valid = false; + if (KVM_BUG_ON(gpc->valid, kvm)) + return -EIO; spin_lock(&kvm->gpc_lock); list_add(&gpc->list, &kvm->gpc_list); @@ -396,12 +375,16 @@ int kvm_gpc_activate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, gpc->active = true; write_unlock_irq(&gpc->lock); } - return kvm_gfn_to_pfn_cache_refresh(kvm, gpc, gpa, len); + return __kvm_gpc_refresh(gpc, gpa, len); } EXPORT_SYMBOL_GPL(kvm_gpc_activate); -void kvm_gpc_deactivate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) +void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc) { + struct kvm *kvm = gpc->kvm; + kvm_pfn_t old_pfn; + void *old_khva; + if (gpc->active) { /* * Deactivate the cache before removing it from the list, KVM @@ -410,13 +393,26 @@ void kvm_gpc_deactivate(struct kvm *kvm, struct gfn_to_pfn_cache *gpc) */ write_lock_irq(&gpc->lock); gpc->active = false; + gpc->valid = false; + + /* + * Leave the GPA => uHVA cache intact, it's protected by the + * memslot generation. The PFN lookup needs to be redone every + * time as mmu_notifier protection is lost when the cache is + * removed from the VM's gpc_list. + */ + old_khva = gpc->khva - offset_in_page(gpc->khva); + gpc->khva = NULL; + + old_pfn = gpc->pfn; + gpc->pfn = KVM_PFN_ERR_FAULT; write_unlock_irq(&gpc->lock); spin_lock(&kvm->gpc_lock); list_del(&gpc->list); spin_unlock(&kvm->gpc_lock); - kvm_gfn_to_pfn_cache_unmap(kvm, gpc); + gpc_unmap_khva(old_pfn, old_khva); } } EXPORT_SYMBOL_GPL(kvm_gpc_deactivate); |