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No conflicts.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC fix from Arnd Bergmann:
"One last build fix came in, addressing a link failure when building
without CONFIG_OUTER_CACHE"
* tag 'soc-fixes-6.1-5' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
ARM: at91: fix build for SAMA5D3 w/o L2 cache
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https://git.kernel.org/pub/scm/linux/kernel/git/at91/linux into arm/fixes
AT91 fixes for 6.1 #3
It contains:
- build fix for SAMA5D3 devices which don't have an L2 cache and due to this
accesssing outer_cache.write_sec in sama5_secure_cache_init() could throw
undefined reference to `outer_cache' if CONFIG_OUTER_CACHE is disabled
from common sama5_defconfig.
* tag 'at91-fixes-6.1-3' of https://git.kernel.org/pub/scm/linux/kernel/git/at91/linux:
ARM: at91: fix build for SAMA5D3 w/o L2 cache
Link: https://lore.kernel.org/r/20221125093521.382105-1-claudiu.beznea@microchip.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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The L2 cache is present on the newer SAMA5D2 and SAMA5D4 families, but
apparently not for the older SAMA5D3.
Solves a build-time regression with the following symptom:
sama5.c:(.init.text+0x48): undefined reference to `outer_cache'
Fixes: 3b5a7ca7d252 ("ARM: at91: setup outer cache .write_sec() callback if needed")
Signed-off-by: Peter Rosin <peda@axentia.se>
[claudiu.beznea: delete "At least not always." from commit description]
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/b7f8dacc-5e1f-0eb2-188e-3ad9a9f7613d@axentia.se
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git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
Pull LoongArch fixes from Huacai Chen:
"Export smp_send_reschedule() for modules use, fix a huge page entry
update issue, and add documents for booting description"
* tag 'loongarch-fixes-6.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
docs/zh_CN: Add LoongArch booting description's translation
docs/LoongArch: Add booting description
LoongArch: mm: Fix huge page entry update for virtual machine
LoongArch: Export symbol for function smp_send_reschedule()
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In virtual machine (guest mode), the tlbwr instruction can not write the
last entry of MTLB, so we need to make it non-present by invtlb and then
write it by tlbfill. This also simplify the whole logic.
Signed-off-by: Rui Wang <wangrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Function smp_send_reschedule() is standard kernel API, which is defined
in header file include/linux/smp.h. However, on LoongArch it is defined
as an inline function, this is confusing and kernel modules can not use
this function.
Now we define smp_send_reschedule() as a general function, and add a
EXPORT_SYMBOL_GPL on this function, so that kernel modules can use it.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fix from Catalin Marinas:
"Revert the dropping of the cache invalidation from the arm64
arch_dma_prep_coherent() as it caused a regression in the
qcom_q6v5_mss remoteproc driver.
The driver is already buggy but the original arm64 change made
the problem obvious. The change will be re-introduced once the
driver is fixed"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
Revert "arm64: dma: Drop cache invalidation from arch_dma_prep_coherent()"
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This reverts commit c44094eee32f32f175aadc0efcac449d99b1bbf7.
Although the semantics of the DMA API require only a clean operation
here, it turns out that the Qualcomm 'qcom_q6v5_mss' remoteproc driver
(ab)uses the DMA API for transferring the modem firmware to the secure
world via calls to Trustzone [1].
Once the firmware buffer has changed hands, _any_ access from the
non-secure side (i.e. Linux) will be detected on the bus and result in a
full system reset [2]. Although this is possible even with this revert
in place (due to speculative reads via the cacheable linear alias of
memory), anecdotally the problem occurs considerably more frequently
when the lines have not been invalidated, assumedly due to some
micro-architectural interactions with the cache hierarchy.
Revert the offending change for now, along with a comment, so that the
Qualcomm developers have time to fix the driver [3] to use a firmware
buffer which does not have a cacheable alias in the linear map.
Link: https://lore.kernel.org/r/20221114110329.68413-1-manivannan.sadhasivam@linaro.org [1]
Link: https://lore.kernel.org/r/CAMi1Hd3H2k1J8hJ6e-Miy5+nVDNzv6qQ3nN-9929B0GbHJkXEg@mail.gmail.com/ [2]
Link: https://lore.kernel.org/r/20221206092152.GD15486@thinkpad [2]
Reported-by: Amit Pundir <amit.pundir@linaro.org>
Reported-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Will Deacon <will@kernel.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20221206103403.646-1-will@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Pull kvm fixes from Paolo Bonzini:
"Unless anything comes from the ARM side, this should be the last pull
request for this release - and it's mostly documentation:
- Document the interaction between KVM_CAP_HALT_POLL and halt_poll_ns
- s390: fix multi-epoch extension in nested guests
- x86: fix uninitialized variable on nested triple fault"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: Document the interaction between KVM_CAP_HALT_POLL and halt_poll_ns
KVM: Move halt-polling documentation into common directory
KVM: x86: fix uninitialized variable use on KVM_REQ_TRIPLE_FAULT
KVM: s390: vsie: Fix the initialization of the epoch extension (epdx) field
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If a triple fault was fixed by kvm_x86_ops.nested_ops->triple_fault (by
turning it into a vmexit), there is no need to leave vcpu_enter_guest().
Any vcpu->requests will be caught later before the actual vmentry,
and in fact vcpu_enter_guest() was not initializing the "r" variable.
Depending on the compiler's whims, this could cause the
x86_64/triple_fault_event_test test to fail.
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Fixes: 92e7d5c83aff ("KVM: x86: allow L1 to not intercept triple fault")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD
VSIE epdx shadowing fix
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We recently experienced some weird huge time jumps in nested guests when
rebooting them in certain cases. After adding some debug code to the epoch
handling in vsie.c (thanks to David Hildenbrand for the idea!), it was
obvious that the "epdx" field (the multi-epoch extension) did not get set
to 0xff in case the "epoch" field was negative.
Seems like the code misses to copy the value from the epdx field from
the guest to the shadow control block. By doing so, the weird time
jumps are gone in our scenarios.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2140899
Fixes: 8fa1696ea781 ("KVM: s390: Multiple Epoch Facility support")
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Cc: stable@vger.kernel.org # 4.19+
Link: https://lore.kernel.org/r/20221123090833.292938-1-thuth@redhat.com
Message-Id: <20221123090833.292938-1-thuth@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
- Fix oops in 32-bit BPF tail call tests
- Add missing declaration for machine_check_early_boot()
Thanks to Christophe Leroy and Naveen N. Rao.
* tag 'powerpc-6.1-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/64s: Add missing declaration for machine_check_early_boot()
powerpc/bpf/32: Fix Oops on tail call tests
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There's no declaration for machine_check_early_boot(), which leads to a
build failure with W=1. Add one.
Fixes: 2f5182cffa43 ("powerpc/64s: early boot machine check handler")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221125132521.2167039-1-mpe@ellerman.id.au
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test_bpf tail call tests end up as:
test_bpf: #0 Tail call leaf jited:1 85 PASS
test_bpf: #1 Tail call 2 jited:1 111 PASS
test_bpf: #2 Tail call 3 jited:1 145 PASS
test_bpf: #3 Tail call 4 jited:1 170 PASS
test_bpf: #4 Tail call load/store leaf jited:1 190 PASS
test_bpf: #5 Tail call load/store jited:1
BUG: Unable to handle kernel data access on write at 0xf1b4e000
Faulting instruction address: 0xbe86b710
Oops: Kernel access of bad area, sig: 11 [#1]
BE PAGE_SIZE=4K MMU=Hash PowerMac
Modules linked in: test_bpf(+)
CPU: 0 PID: 97 Comm: insmod Not tainted 6.1.0-rc4+ #195
Hardware name: PowerMac3,1 750CL 0x87210 PowerMac
NIP: be86b710 LR: be857e88 CTR: be86b704
REGS: f1b4df20 TRAP: 0300 Not tainted (6.1.0-rc4+)
MSR: 00009032 <EE,ME,IR,DR,RI> CR: 28008242 XER: 00000000
DAR: f1b4e000 DSISR: 42000000
GPR00: 00000001 f1b4dfe0 c11d2280 00000000 00000000 00000000 00000002 00000000
GPR08: f1b4e000 be86b704 f1b4e000 00000000 00000000 100d816a f2440000 fe73baa8
GPR16: f2458000 00000000 c1941ae4 f1fe2248 00000045 c0de0000 f2458030 00000000
GPR24: 000003e8 0000000f f2458000 f1b4dc90 3e584b46 00000000 f24466a0 c1941a00
NIP [be86b710] 0xbe86b710
LR [be857e88] __run_one+0xec/0x264 [test_bpf]
Call Trace:
[f1b4dfe0] [00000002] 0x2 (unreliable)
Instruction dump:
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
---[ end trace 0000000000000000 ]---
This is a tentative to write above the stack. The problem is encoutered
with tests added by commit 38608ee7b690 ("bpf, tests: Add load store
test case for tail call")
This happens because tail call is done to a BPF prog with a different
stack_depth. At the time being, the stack is kept as is when the caller
tail calls its callee. But at exit, the callee restores the stack based
on its own properties. Therefore here, at each run, r1 is erroneously
increased by 32 - 16 = 16 bytes.
This was done that way in order to pass the tail call count from caller
to callee through the stack. As powerpc32 doesn't have a red zone in
the stack, it was necessary the maintain the stack as is for the tail
call. But it was not anticipated that the BPF frame size could be
different.
Let's take a new approach. Use register r4 to carry the tail call count
during the tail call, and save it into the stack at function entry if
required. This means the input parameter must be in r3, which is more
correct as it is a 32 bits parameter, then tail call better match with
normal BPF function entry, the down side being that we move that input
parameter back and forth between r3 and r4. That can be optimised later.
Doing that also has the advantage of maximising the common parts between
tail calls and a normal function exit.
With the fix, tail call tests are now successfull:
test_bpf: #0 Tail call leaf jited:1 53 PASS
test_bpf: #1 Tail call 2 jited:1 115 PASS
test_bpf: #2 Tail call 3 jited:1 154 PASS
test_bpf: #3 Tail call 4 jited:1 165 PASS
test_bpf: #4 Tail call load/store leaf jited:1 101 PASS
test_bpf: #5 Tail call load/store jited:1 141 PASS
test_bpf: #6 Tail call error path, max count reached jited:1 994 PASS
test_bpf: #7 Tail call count preserved across function calls jited:1 140975 PASS
test_bpf: #8 Tail call error path, NULL target jited:1 110 PASS
test_bpf: #9 Tail call error path, index out of range jited:1 69 PASS
test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed]
Suggested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Fixes: 51c66ad849a7 ("powerpc/bpf: Implement extended BPF on PPC32")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/757acccb7fbfc78efa42dcf3c974b46678198905.1669278887.git.christophe.leroy@csgroup.eu
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git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt:
- build fix for the NR_CPUS Kconfig SBI version dependency
- fixes to early memory initialization, to fix page permissions in EFI
and post-initmem-free
- build fix for the VDSO, to avoid trying to profile the VDSO functions
- fixes for kexec crash handling, to fix multi-core and interrupt
related initialization inside the crash kernel
- fix for a race condition when handling multiple concurrect kernel
stack overflows
* tag 'riscv-for-linus-6.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: kexec: Fixup crash_smp_send_stop without multi cores
riscv: kexec: Fixup irq controller broken in kexec crash path
riscv: mm: Proper page permissions after initmem free
riscv: vdso: fix section overlapping under some conditions
riscv: fix race when vmap stack overflow
riscv: Sync efi page table's kernel mappings before switching
riscv: Fix NR_CPUS range conditions
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This fixes a concrete bug but is also the basis for some cleanup work,
so I'm merging it based on the offending commit in order to minimize
future conflicts.
* commit '7e1864332fbc1b993659eab7974da9fe8bf8c128':
riscv: fix race when vmap stack overflow
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Currently, when detecting vmap stack overflow, riscv firstly switches
to the so called shadow stack, then use this shadow stack to call the
get_overflow_stack() to get the overflow stack. However, there's
a race here if two or more harts use the same shadow stack at the same
time.
To solve this race, we introduce spin_shadow_stack atomic var, which
will be swap between its own address and 0 in atomic way, when the
var is set, it means the shadow_stack is being used; when the var
is cleared, it means the shadow_stack isn't being used.
Fixes: 31da94c25aea ("riscv: add VMAP_STACK overflow detection")
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Suggested-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20221030124517.2370-1-jszhang@kernel.org
[Palmer: Add AQ to the swap, and also some comments.]
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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machine_kexec_mask_interrupts"
guoren@kernel.org <guoren@kernel.org> says:
From: Guo Ren <guoren@linux.alibaba.com>
Current riscv kexec can't crash_save percpu states and disable
interrupts properly. The patch series fix them, make kexec work correct.
* b4-shazam-merge:
riscv: kexec: Fixup crash_smp_send_stop without multi cores
riscv: kexec: Fixup irq controller broken in kexec crash path
Link: https://lore.kernel.org/r/20221020141603.2856206-1-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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Current crash_smp_send_stop is the same as the generic one in
kernel/panic and misses crash_save_cpu in percpu. This patch is inspired
by 78fd584cdec0 ("arm64: kdump: implement machine_crash_shutdown()")
and adds the same mechanism for riscv.
Before this patch, test result:
crash> help -r
CPU 0: [OFFLINE]
CPU 1:
epc : ffffffff80009ff0 ra : ffffffff800b789a sp : ff2000001098bb40
gp : ffffffff815fca60 tp : ff60000004680000 t0 : 6666666666663c5b
t1 : 0000000000000000 t2 : 666666666666663c s0 : ff2000001098bc90
s1 : ffffffff81600798 a0 : ff2000001098bb48 a1 : 0000000000000000
a2 : 0000000000000000 a3 : 0000000000000001 a4 : 0000000000000000
a5 : ff60000004690800 a6 : 0000000000000000 a7 : 0000000000000000
s2 : ff2000001098bb48 s3 : ffffffff81093ec8 s4 : ffffffff816004ac
s5 : 0000000000000000 s6 : 0000000000000007 s7 : ffffffff80e7f720
s8 : 00fffffffffff3f0 s9 : 0000000000000007 s10: 00aaaaaaaab98700
s11: 0000000000000001 t3 : ffffffff819a8097 t4 : ffffffff819a8097
t5 : ffffffff819a8098 t6 : ff2000001098b9a8
CPU 2: [OFFLINE]
CPU 3: [OFFLINE]
After this patch, test result:
crash> help -r
CPU 0:
epc : ffffffff80003f34 ra : ffffffff808caa7c sp : ffffffff81403eb0
gp : ffffffff815fcb48 tp : ffffffff81413400 t0 : 0000000000000000
t1 : 0000000000000000 t2 : 0000000000000000 s0 : ffffffff81403ec0
s1 : 0000000000000000 a0 : 0000000000000000 a1 : 0000000000000000
a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000
s2 : ffffffff816001c8 s3 : ffffffff81600370 s4 : ffffffff80c32e18
s5 : ffffffff819d3018 s6 : ffffffff810e2110 s7 : 0000000000000000
s8 : 0000000000000000 s9 : 0000000080039eac s10: 0000000000000000
s11: 0000000000000000 t3 : 0000000000000000 t4 : 0000000000000000
t5 : 0000000000000000 t6 : 0000000000000000
CPU 1:
epc : ffffffff80003f34 ra : ffffffff808caa7c sp : ff2000000068bf30
gp : ffffffff815fcb48 tp : ff6000000240d400 t0 : 0000000000000000
t1 : 0000000000000000 t2 : 0000000000000000 s0 : ff2000000068bf40
s1 : 0000000000000001 a0 : 0000000000000000 a1 : 0000000000000000
a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000
s2 : ffffffff816001c8 s3 : ffffffff81600370 s4 : ffffffff80c32e18
s5 : ffffffff819d3018 s6 : ffffffff810e2110 s7 : 0000000000000000
s8 : 0000000000000000 s9 : 0000000080039ea8 s10: 0000000000000000
s11: 0000000000000000 t3 : 0000000000000000 t4 : 0000000000000000
t5 : 0000000000000000 t6 : 0000000000000000
CPU 2:
epc : ffffffff80003f34 ra : ffffffff808caa7c sp : ff20000000693f30
gp : ffffffff815fcb48 tp : ff6000000240e900 t0 : 0000000000000000
t1 : 0000000000000000 t2 : 0000000000000000 s0 : ff20000000693f40
s1 : 0000000000000002 a0 : 0000000000000000 a1 : 0000000000000000
a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000
s2 : ffffffff816001c8 s3 : ffffffff81600370 s4 : ffffffff80c32e18
s5 : ffffffff819d3018 s6 : ffffffff810e2110 s7 : 0000000000000000
s8 : 0000000000000000 s9 : 0000000080039eb0 s10: 0000000000000000
s11: 0000000000000000 t3 : 0000000000000000 t4 : 0000000000000000
t5 : 0000000000000000 t6 : 0000000000000000
CPU 3:
epc : ffffffff8000a1e4 ra : ffffffff800b7bba sp : ff200000109bbb40
gp : ffffffff815fcb48 tp : ff6000000373aa00 t0 : 6666666666663c5b
t1 : 0000000000000000 t2 : 666666666666663c s0 : ff200000109bbc90
s1 : ffffffff816007a0 a0 : ff200000109bbb48 a1 : 0000000000000000
a2 : 0000000000000000 a3 : 0000000000000001 a4 : 0000000000000000
a5 : ff60000002c61c00 a6 : 0000000000000000 a7 : 0000000000000000
s2 : ff200000109bbb48 s3 : ffffffff810941a8 s4 : ffffffff816004b4
s5 : 0000000000000000 s6 : 0000000000000007 s7 : ffffffff80e7f7a0
s8 : 00fffffffffff3f0 s9 : 0000000000000007 s10: 00aaaaaaaab98700
s11: 0000000000000001 t3 : ffffffff819a8097 t4 : ffffffff819a8097
t5 : ffffffff819a8098 t6 : ff200000109bb9a8
Fixes: ad943893d5f1 ("RISC-V: Fixup schedule out issue in machine_crash_shutdown()")
Reviewed-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Cc: Nick Kossifidis <mick@ics.forth.gr>
Link: https://lore.kernel.org/r/20221020141603.2856206-3-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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If a crash happens on cpu3 and all interrupts are binding on cpu0, the
bad irq routing will cause a crash kernel which can't receive any irq.
Because crash kernel won't clean up all harts' PLIC enable bits in
enable registers. This patch is similar to 9141a003a491 ("ARM: 7316/1:
kexec: EOI active and mask all interrupts in kexec crash path") and
78fd584cdec0 ("arm64: kdump: implement machine_crash_shutdown()"), and
PowerPC also has the same mechanism.
Fixes: fba8a8674f68 ("RISC-V: Add kexec support")
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Cc: Nick Kossifidis <mick@ics.forth.gr>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20221020141603.2856206-2-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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64-bit RISC-V kernels have the kernel image mapped separately to alias
the linear map. The linear map and the kernel image map are documented
as "direct mapping" and "kernel" respectively in [1].
At image load time, the linear map corresponding to the kernel image
is set to PAGE_READ permission, and the kernel image map is set to
PAGE_READ|PAGE_EXEC.
When the initmem is freed, the pages in the linear map should be
restored to PAGE_READ|PAGE_WRITE, whereas the corresponding pages in
the kernel image map should be restored to PAGE_READ, by removing the
PAGE_EXEC permission.
This is not the case. For 64-bit kernels, only the linear map is
restored to its proper page permissions at initmem free, and not the
kernel image map.
In practise this results in that the kernel can potentially jump to
dead __init code, and start executing invalid instructions, without
getting an exception.
Restore the freed initmem properly, by setting both the kernel image
map to the correct permissions.
[1] Documentation/riscv/vm-layout.rst
Fixes: e5c35fa04019 ("riscv: Map the kernel with correct permissions the first time")
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alex@ghiti.fr>
Tested-by: Alexandre Ghiti <alex@ghiti.fr>
Link: https://lore.kernel.org/r/20221115090641.258476-1-bjorn@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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lkp reported a build error, I tried the config and can reproduce
build error as below:
VDSOLD arch/riscv/kernel/vdso/vdso.so.dbg
ld.lld: error: section .note file range overlaps with .text
>>> .note range is [0x7C8, 0x803]
>>> .text range is [0x800, 0x1993]
ld.lld: error: section .text file range overlaps with .dynamic
>>> .text range is [0x800, 0x1993]
>>> .dynamic range is [0x808, 0x937]
ld.lld: error: section .note virtual address range overlaps with .text
>>> .note range is [0x7C8, 0x803]
>>> .text range is [0x800, 0x1993]
Fix it by setting DISABLE_BRANCH_PROFILING which will disable branch
tracing for vdso, thus avoid useless _ftrace_annotated_branch section
and _ftrace_branch section. Although we can also fix it by removing
the hardcoded .text begin address, but I think that's another story
and should be put into another patch.
Link: https://lore.kernel.org/lkml/202210122123.Cc4FPShJ-lkp@intel.com/#r
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20221102170254.1925-1-jszhang@kernel.org
Fixes: ad5d1122b82f ("riscv: use vDSO common flow to reduce the latency of the time-related functions")
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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The EFI page table is initially created as a copy of the kernel page table.
With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area:
if the stack is allocated in a new PGD (one that was not present at the
moment of the efi page table creation or not synced in a previous vmalloc
fault), the kernel will take a trap when switching to the efi page table
when the vmalloc kernel stack is accessed, resulting in a kernel panic.
Fix that by updating the efi kernel mappings before switching to the efi
page table.
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Fixes: b91540d52a08 ("RISC-V: Add EFI runtime services")
Tested-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20221121133303.1782246-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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The conditions reference the symbol SBI_V01, which does not exist. The
correct symbol is RISCV_SBI_V01.
Fixes: e623715f3d67 ("RISC-V: Increase range and default value of NR_CPUS")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221126061557.3541-1-samuel@sholland.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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The "force" argument to write_spec_ctrl_current() is currently ambiguous
as it does not guarantee the MSR write. This is due to the optimization
that writes to the MSR happen only when the new value differs from the
cached value.
This is fine in most cases, but breaks for S3 resume when the cached MSR
value gets out of sync with the hardware MSR value due to S3 resetting
it.
When x86_spec_ctrl_current is same as x86_spec_ctrl_base, the MSR write
is skipped. Which results in SPEC_CTRL mitigations not getting restored.
Move the MSR write from write_spec_ctrl_current() to a new function that
unconditionally writes to the MSR. Update the callers accordingly and
rename functions.
[ bp: Rework a bit. ]
Fixes: caa0ff24d5d0 ("x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value")
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/806d39b0bfec2fe8f50dc5446dff20f5bb24a959.1669821572.git.pawan.kumar.gupta@linux.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc hotfixes from Andrew Morton:
"15 hotfixes, 11 marked cc:stable.
Only three or four of the latter address post-6.0 issues, which is
hopefully a sign that things are converging"
* tag 'mm-hotfixes-stable-2022-12-02' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
revert "kbuild: fix -Wimplicit-function-declaration in license_is_gpl_compatible"
Kconfig.debug: provide a little extra FRAME_WARN leeway when KASAN is enabled
drm/amdgpu: temporarily disable broken Clang builds due to blown stack-frame
mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
mm/khugepaged: fix GUP-fast interaction by sending IPI
mm/khugepaged: take the right locks for page table retraction
mm: migrate: fix THP's mapcount on isolation
mm: introduce arch_has_hw_nonleaf_pmd_young()
mm: add dummy pmd_young() for architectures not having it
mm/damon/sysfs: fix wrong empty schemes assumption under online tuning in damon_sysfs_set_schemes()
tools/vm/slabinfo-gnuplot: use "grep -E" instead of "egrep"
nilfs2: fix NULL pointer dereference in nilfs_palloc_commit_free_entry()
hugetlb: don't delete vma_lock in hugetlb MADV_DONTNEED processing
madvise: use zap_page_range_single for madvise dontneed
mm: replace VM_WARN_ON to pr_warn if the node is offline with __GFP_THISNODE
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When running as a Xen PV guests commit eed9a328aa1a ("mm: x86: add
CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG") can cause a protection violation in
pmdp_test_and_clear_young():
BUG: unable to handle page fault for address: ffff8880083374d0
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD 3026067 P4D 3026067 PUD 3027067 PMD 7fee5067 PTE 8010000008337065
Oops: 0003 [#1] PREEMPT SMP NOPTI
CPU: 7 PID: 158 Comm: kswapd0 Not tainted 6.1.0-rc5-20221118-doflr+ #1
RIP: e030:pmdp_test_and_clear_young+0x25/0x40
This happens because the Xen hypervisor can't emulate direct writes to
page table entries other than PTEs.
This can easily be fixed by introducing arch_has_hw_nonleaf_pmd_young()
similar to arch_has_hw_pte_young() and test that instead of
CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG.
Link: https://lkml.kernel.org/r/20221123064510.16225-1-jgross@suse.com
Fixes: eed9a328aa1a ("mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Acked-by: Yu Zhao <yuzhao@google.com>
Tested-by: Sander Eikelenboom <linux@eikelenboom.it>
Acked-by: David Hildenbrand <david@redhat.com> [core changes]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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In order to avoid #ifdeffery add a dummy pmd_young() implementation as a
fallback. This is required for the later patch "mm: introduce
arch_has_hw_nonleaf_pmd_young()".
Link: https://lkml.kernel.org/r/fd3ac3cd-7349-6bbd-890a-71a9454ca0b3@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Yu Zhao <yuzhao@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
Pull EFI fix from Ard Biesheuvel:
"A single revert for some code that I added during this cycle. The code
is not wrong, but it should be a bit more careful about how to handle
the shadow call stack pointer, so it is better to revert it for now
and bring it back later in improved form.
Summary:
- Revert runtime service sync exception recovery on arm64"
* tag 'efi-fixes-for-v6.1-4' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
arm64: efi: Revert "Recover from synchronous exceptions ..."
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This reverts commit 23715a26c8d81291, which introduced some code in
assembler that manipulates both the ordinary and the shadow call stack
pointer in a way that could potentially be taken advantage of. So let's
revert it, and do a better job the next time around.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
Pull clk fixes from Stephen Boyd:
"A set of clk driver fixes that resolve issues for various SoCs.
Most of these are incorrect clk data, like bad parent descriptions.
When the clk tree is improperly described things don't work, like USB
and UFS controllers, because clk frequencies are wonky. Here are the
extra details:
- Fix the parent of UFS reference clks on Qualcomm SC8280XP so that
UFS works properly
- Fix the clk ID for USB on AT91 RM9200 so the USB driver continues
to probe
- Stop using of_device_get_match_data() on the wrong device for a
Samsung Exynos driver so it gets the proper clk data
- Fix ExynosAutov9 binding
- Fix the parent of the div4 clk on Exynos7885
- Stop calling runtime PM APIs from the Qualcomm GDSC driver directly
as it leads to a lockdep splat and is just plain wrong because it
violates runtime PM semantics by calling runtime PM APIs when the
device has been runtime PM disabled"
* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
clk: qcom: gcc-sc8280xp: add cxo as parent for three ufs ref clks
ARM: at91: rm9200: fix usb device clock id
clk: samsung: Revert "clk: samsung: exynos-clkout: Use of_device_get_match_data()"
dt-bindings: clock: exynosautov9: fix reference to CMU_FSYS1
clk: qcom: gdsc: Remove direct runtime PM calls
clk: samsung: exynos7885: Correct "div4" clock parents
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Referring to the datasheet the index 2 is the MCKUDP. When enabled, it
"Enables the automatic disable of the Master Clock of the USB Device
Port when a suspend condition occurs". We fix the index to the real UDP
id which "Enables the 48 MHz clock of the USB Device Port".
Cc: nicolas.ferre@microchip.com
Cc: ludovic.desroches@microchip.com
Cc: alexandre.belloni@bootlin.com
Cc: mturquette@baylibre.com
Cc: sboyd@kernel.org
Cc: claudiu.beznea@microchip.com
Cc: linux-clk@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: kernel@pengutronix.de
Fixes: 02ff48e4d7f7 ("clk: at91: add at91rm9200 pmc driver")
Fixes: 0e0e528d8260 ("ARM: dts: at91: rm9200: switch to new clock bindings")
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221114185923.1023249-2-m.grzeschik@pengutronix.de
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tools/lib/bpf/ringbuf.c
927cbb478adf ("libbpf: Handle size overflow for ringbuf mmap")
b486d19a0ab0 ("libbpf: checkpatch: Fixed code alignments in ringbuf.c")
https://lore.kernel.org/all/20221121122707.44d1446a@canb.auug.org.au/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
- ioremap: mask out the bits which are not part of the physical address
*after* the size computation is done to prevent any hypothetical
ioremap failures
- Change the MSR save/restore functionality during suspend to rely on
flags denoting that the related MSRs are actually supported vs
reading them and assuming they are (an Atom one allows reading but
not writing, thus breaking this scheme at resume time)
- prevent IV reuse in the AES-GCM communication scheme between SNP
guests and the AMD secure processor
* tag 'x86_urgent_for_v6.1_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/ioremap: Fix page aligned size calculation in __ioremap_caller()
x86/pm: Add enumeration check before spec MSRs save/restore setup
x86/tsx: Add a feature bit for TSX control MSR support
virt/sev-guest: Prevent IV reuse in the SNP guest driver
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Current code re-calculates the size after aligning the starting and
ending physical addresses on a page boundary. But the re-calculation
also embeds the masking of high order bits that exceed the size of
the physical address space (via PHYSICAL_PAGE_MASK). If the masking
removes any high order bits, the size calculation results in a huge
value that is likely to immediately fail.
Fix this by re-calculating the page-aligned size first. Then mask any
high order bits using PHYSICAL_PAGE_MASK.
Fixes: ffa71f33a820 ("x86, ioremap: Fix incorrect physical address handling in PAE mode")
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/1668624097-14884-2-git-send-email-mikelley@microsoft.com
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pm_save_spec_msr() keeps a list of all the MSRs which _might_ need
to be saved and restored at hibernate and resume. However, it has
zero awareness of CPU support for these MSRs. It mostly works by
unconditionally attempting to manipulate these MSRs and relying on
rdmsrl_safe() being able to handle a #GP on CPUs where the support is
unavailable.
However, it's possible for reads (RDMSR) to be supported for a given MSR
while writes (WRMSR) are not. In this case, msr_build_context() sees
a successful read (RDMSR) and marks the MSR as valid. Then, later, a
write (WRMSR) fails, producing a nasty (but harmless) error message.
This causes restore_processor_state() to try and restore it, but writing
this MSR is not allowed on the Intel Atom N2600 leading to:
unchecked MSR access error: WRMSR to 0x122 (tried to write 0x0000000000000002) \
at rIP: 0xffffffff8b07a574 (native_write_msr+0x4/0x20)
Call Trace:
<TASK>
restore_processor_state
x86_acpi_suspend_lowlevel
acpi_suspend_enter
suspend_devices_and_enter
pm_suspend.cold
state_store
kernfs_fop_write_iter
vfs_write
ksys_write
do_syscall_64
? do_syscall_64
? up_read
? lock_is_held_type
? asm_exc_page_fault
? lockdep_hardirqs_on
entry_SYSCALL_64_after_hwframe
To fix this, add the corresponding X86_FEATURE bit for each MSR. Avoid
trying to manipulate the MSR when the feature bit is clear. This
required adding a X86_FEATURE bit for MSRs that do not have one already,
but it's a small price to pay.
[ bp: Move struct msr_enumeration inside the only function that uses it. ]
Fixes: 73924ec4d560 ("x86/pm: Save the MSR validity status at context setup")
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/c24db75d69df6e66c0465e13676ad3f2837a2ed8.1668539735.git.pawan.kumar.gupta@linux.intel.com
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Support for the TSX control MSR is enumerated in MSR_IA32_ARCH_CAPABILITIES.
This is different from how other CPU features are enumerated i.e. via
CPUID. Currently, a call to tsx_ctrl_is_supported() is required for
enumerating the feature. In the absence of a feature bit for TSX control,
any code that relies on checking feature bits directly will not work.
In preparation for adding a feature bit check in MSR save/restore
during suspend/resume, set a new feature bit X86_FEATURE_TSX_CTRL when
MSR_IA32_TSX_CTRL is present. Also make tsx_ctrl_is_supported() use the
new feature bit to avoid any overhead of reading the MSR.
[ bp: Remove tsx_ctrl_is_supported(), add room for two more feature
bits in word 11 which are coming up in the next merge window. ]
Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/de619764e1d98afbb7a5fa58424f1278ede37b45.1668539735.git.pawan.kumar.gupta@linux.intel.com
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Pull kvm fixes from Paolo Bonzini:
"x86:
- Fixes for Xen emulation. While nobody should be enabling it in the
kernel (the only public users of the feature are the selftests),
the bug effectively allows userspace to read arbitrary memory.
- Correctness fixes for nested hypervisors that do not intercept INIT
or SHUTDOWN on AMD; the subsequent CPU reset can cause a
use-after-free when it disables virtualization extensions. While
downgrading the panic to a WARN is quite easy, the full fix is a
bit more laborious; there are also tests. This is the bulk of the
pull request.
- Fix race condition due to incorrect mmu_lock use around
make_mmu_pages_available().
Generic:
- Obey changes to the kvm.halt_poll_ns module parameter in VMs not
using KVM_CAP_HALT_POLL, restoring behavior from before the
introduction of the capability"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: Update gfn_to_pfn_cache khva when it moves within the same page
KVM: x86/xen: Only do in-kernel acceleration of hypercalls for guest CPL0
KVM: x86/xen: Validate port number in SCHEDOP_poll
KVM: x86/mmu: Fix race condition in direct_page_fault
KVM: x86: remove exit_int_info warning in svm_handle_exit
KVM: selftests: add svm part to triple_fault_test
KVM: x86: allow L1 to not intercept triple fault
kvm: selftests: add svm nested shutdown test
KVM: selftests: move idt_entry to header
KVM: x86: forcibly leave nested mode on vCPU reset
KVM: x86: add kvm_leave_nested
KVM: x86: nSVM: harden svm_free_nested against freeing vmcb02 while still in use
KVM: x86: nSVM: leave nested mode on vCPU free
KVM: Obey kvm.halt_poll_ns in VMs not using KVM_CAP_HALT_POLL
KVM: Avoid re-reading kvm->max_halt_poll_ns during halt-polling
KVM: Cap vcpu->halt_poll_ns before halting rather than after
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This brings in a few important fixes for Xen emulation.
While nobody should be enabling it, the bug effectively
allows userspace to read arbitrary memory.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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There are almost no hypercalls which are valid from CPL > 0, and definitely
none which are handled by the kernel.
Fixes: 2fd6df2f2b47 ("KVM: x86/xen: intercept EVTCHNOP_send from guests")
Reported-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Cc: stable@kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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We shouldn't allow guests to poll on arbitrary port numbers off the end
of the event channel table.
Fixes: 1a65105a5aba ("KVM: x86/xen: handle PV spinlocks slowpath")
[dwmw2: my bug though; the original version did check the validity as a
side-effect of an idr_find() which I ripped out in refactoring.]
Reported-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Cc: stable@kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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make_mmu_pages_available() must be called with mmu_lock held for write.
However, if the TDP MMU is used, it will be called with mmu_lock held for
read.
This function does nothing unless shadow pages are used, so there is no
race unless nested TDP is used.
Since nested TDP uses shadow pages, old shadow pages may be zapped by this
function even when the TDP MMU is enabled.
Since shadow pages are never allocated by kvm_tdp_mmu_map(), a race
condition can be avoided by not calling make_mmu_pages_available() if the
TDP MMU is currently in use.
I encountered this when repeatedly starting and stopping nested VM.
It can be artificially caused by allocating a large number of nested TDP
SPTEs.
For example, the following BUG and general protection fault are caused in
the host kernel.
pte_list_remove: 00000000cd54fc10 many->many
------------[ cut here ]------------
kernel BUG at arch/x86/kvm/mmu/mmu.c:963!
invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
RIP: 0010:pte_list_remove.cold+0x16/0x48 [kvm]
Call Trace:
<TASK>
drop_spte+0xe0/0x180 [kvm]
mmu_page_zap_pte+0x4f/0x140 [kvm]
__kvm_mmu_prepare_zap_page+0x62/0x3e0 [kvm]
kvm_mmu_zap_oldest_mmu_pages+0x7d/0xf0 [kvm]
direct_page_fault+0x3cb/0x9b0 [kvm]
kvm_tdp_page_fault+0x2c/0xa0 [kvm]
kvm_mmu_page_fault+0x207/0x930 [kvm]
npf_interception+0x47/0xb0 [kvm_amd]
svm_invoke_exit_handler+0x13c/0x1a0 [kvm_amd]
svm_handle_exit+0xfc/0x2c0 [kvm_amd]
kvm_arch_vcpu_ioctl_run+0xa79/0x1780 [kvm]
kvm_vcpu_ioctl+0x29b/0x6f0 [kvm]
__x64_sys_ioctl+0x95/0xd0
do_syscall_64+0x5c/0x90
general protection fault, probably for non-canonical address
0xdead000000000122: 0000 [#1] PREEMPT SMP NOPTI
RIP: 0010:kvm_mmu_commit_zap_page.part.0+0x4b/0xe0 [kvm]
Call Trace:
<TASK>
kvm_mmu_zap_oldest_mmu_pages+0xae/0xf0 [kvm]
direct_page_fault+0x3cb/0x9b0 [kvm]
kvm_tdp_page_fault+0x2c/0xa0 [kvm]
kvm_mmu_page_fault+0x207/0x930 [kvm]
npf_interception+0x47/0xb0 [kvm_amd]
CVE: CVE-2022-45869
Fixes: a2855afc7ee8 ("KVM: x86/mmu: Allow parallel page faults for the TDP MMU")
Signed-off-by: Kazuki Takiguchi <takiguchi.kazuki171@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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This fixes three issues in nested SVM:
1) in the shutdown_interception() vmexit handler we call kvm_vcpu_reset().
However, if running nested and L1 doesn't intercept shutdown, the function
resets vcpu->arch.hflags without properly leaving the nested state.
This leaves the vCPU in inconsistent state and later triggers a kernel
panic in SVM code. The same bug can likely be triggered by sending INIT
via local apic to a vCPU which runs a nested guest.
On VMX we are lucky that the issue can't happen because VMX always
intercepts triple faults, thus triple fault in L2 will always be
redirected to L1. Plus, handle_triple_fault() doesn't reset the vCPU.
INIT IPI can't happen on VMX either because INIT events are masked while
in VMX mode.
Secondarily, KVM doesn't honour SHUTDOWN intercept bit of L1 on SVM.
A normal hypervisor should always intercept SHUTDOWN, a unit test on
the other hand might want to not do so.
Finally, the guest can trigger a kernel non rate limited printk on SVM
from the guest, which is fixed as well.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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It is valid to receive external interrupt and have broken IDT entry,
which will lead to #GP with exit_int_into that will contain the index of
the IDT entry (e.g any value).
Other exceptions can happen as well, like #NP or #SS
(if stack switch fails).
Thus this warning can be user triggred and has very little value.
Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-10-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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This is SVM correctness fix - although a sane L1 would intercept
SHUTDOWN event, it doesn't have to, so we have to honour this.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-8-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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While not obivous, kvm_vcpu_reset() leaves the nested mode by clearing
'vcpu->arch.hflags' but it does so without all the required housekeeping.
On SVM, it is possible to have a vCPU reset while in guest mode because
unlike VMX, on SVM, INIT's are not latched in SVM non root mode and in
addition to that L1 doesn't have to intercept triple fault, which should
also trigger L1's reset if happens in L2 while L1 didn't intercept it.
If one of the above conditions happen, KVM will continue to use vmcb02
while not having in the guest mode.
Later the IA32_EFER will be cleared which will lead to freeing of the
nested guest state which will (correctly) free the vmcb02, but since
KVM still uses it (incorrectly) this will lead to a use after free
and kernel crash.
This issue is assigned CVE-2022-3344
Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-5-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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add kvm_leave_nested which wraps a call to nested_ops->leave_nested
into a function.
Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-4-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Make sure that KVM uses vmcb01 before freeing nested state, and warn if
that is not the case.
This is a minimal fix for CVE-2022-3344 making the kernel print a warning
instead of a kernel panic.
Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-3-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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