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-rw-r--r--virt/kvm/arm/arch_timer.c8
-rw-r--r--virt/kvm/arm/arm.c53
-rw-r--r--virt/kvm/arm/hypercalls.c71
-rw-r--r--virt/kvm/arm/mmio.c9
-rw-r--r--virt/kvm/arm/mmu.c30
-rw-r--r--virt/kvm/arm/psci.c84
-rw-r--r--virt/kvm/arm/pvtime.c131
-rw-r--r--virt/kvm/arm/vgic/vgic-init.c21
-rw-r--r--virt/kvm/arm/vgic/vgic-its.c3
-rw-r--r--virt/kvm/arm/vgic/vgic-v3.c12
-rw-r--r--virt/kvm/arm/vgic/vgic-v4.c59
-rw-r--r--virt/kvm/arm/vgic/vgic.c4
-rw-r--r--virt/kvm/arm/vgic/vgic.h2
13 files changed, 324 insertions, 163 deletions
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index e2bb5bd60227..f182b2380345 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -80,7 +80,7 @@ static inline bool userspace_irqchip(struct kvm *kvm)
static void soft_timer_start(struct hrtimer *hrt, u64 ns)
{
hrtimer_start(hrt, ktime_add_ns(ktime_get(), ns),
- HRTIMER_MODE_ABS);
+ HRTIMER_MODE_ABS_HARD);
}
static void soft_timer_cancel(struct hrtimer *hrt)
@@ -697,11 +697,11 @@ void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
ptimer->cntvoff = 0;
- hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+ hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
timer->bg_timer.function = kvm_bg_timer_expire;
- hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
- hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+ hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
+ hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
vtimer->hrtimer.function = kvm_hrtimer_expire;
ptimer->hrtimer.function = kvm_hrtimer_expire;
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 86c6aa1cb58e..8de4daf25097 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -40,6 +40,10 @@
#include <asm/kvm_coproc.h>
#include <asm/sections.h>
+#include <kvm/arm_hypercalls.h>
+#include <kvm/arm_pmu.h>
+#include <kvm/arm_psci.h>
+
#ifdef REQUIRES_VIRT
__asm__(".arch_extension virt");
#endif
@@ -98,6 +102,26 @@ int kvm_arch_check_processor_compat(void)
return 0;
}
+int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
+ struct kvm_enable_cap *cap)
+{
+ int r;
+
+ if (cap->flags)
+ return -EINVAL;
+
+ switch (cap->cap) {
+ case KVM_CAP_ARM_NISV_TO_USER:
+ r = 0;
+ kvm->arch.return_nisv_io_abort_to_user = true;
+ break;
+ default:
+ r = -EINVAL;
+ break;
+ }
+
+ return r;
+}
/**
* kvm_arch_init_vm - initializes a VM data structure
@@ -197,6 +221,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_IMMEDIATE_EXIT:
case KVM_CAP_VCPU_EVENTS:
case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
+ case KVM_CAP_ARM_NISV_TO_USER:
+ case KVM_CAP_ARM_INJECT_EXT_DABT:
r = 1;
break;
case KVM_CAP_ARM_SET_DEVICE_ADDR:
@@ -322,20 +348,24 @@ void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
/*
* If we're about to block (most likely because we've just hit a
* WFI), we need to sync back the state of the GIC CPU interface
- * so that we have the lastest PMR and group enables. This ensures
+ * so that we have the latest PMR and group enables. This ensures
* that kvm_arch_vcpu_runnable has up-to-date data to decide
* whether we have pending interrupts.
+ *
+ * For the same reason, we want to tell GICv4 that we need
+ * doorbells to be signalled, should an interrupt become pending.
*/
preempt_disable();
kvm_vgic_vmcr_sync(vcpu);
+ vgic_v4_put(vcpu, true);
preempt_enable();
-
- kvm_vgic_v4_enable_doorbell(vcpu);
}
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
- kvm_vgic_v4_disable_doorbell(vcpu);
+ preempt_disable();
+ vgic_v4_load(vcpu);
+ preempt_enable();
}
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
@@ -351,6 +381,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
kvm_arm_reset_debug_ptr(vcpu);
+ kvm_arm_pvtime_vcpu_init(&vcpu->arch);
+
return kvm_vgic_vcpu_init(vcpu);
}
@@ -380,11 +412,13 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
kvm_vcpu_load_sysregs(vcpu);
kvm_arch_vcpu_load_fp(vcpu);
kvm_vcpu_pmu_restore_guest(vcpu);
+ if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
+ kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
if (single_task_running())
- vcpu_clear_wfe_traps(vcpu);
+ vcpu_clear_wfx_traps(vcpu);
else
- vcpu_set_wfe_traps(vcpu);
+ vcpu_set_wfx_traps(vcpu);
vcpu_ptrauth_setup_lazy(vcpu);
}
@@ -645,6 +679,9 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu)
* that a VCPU sees new virtual interrupts.
*/
kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
+
+ if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
+ kvm_update_stolen_time(vcpu);
}
}
@@ -1315,7 +1352,7 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
}
-static void cpu_init_hyp_mode(void *dummy)
+static void cpu_init_hyp_mode(void)
{
phys_addr_t pgd_ptr;
unsigned long hyp_stack_ptr;
@@ -1349,7 +1386,7 @@ static void cpu_hyp_reinit(void)
if (is_kernel_in_hyp_mode())
kvm_timer_init_vhe();
else
- cpu_init_hyp_mode(NULL);
+ cpu_init_hyp_mode();
kvm_arm_init_debug();
diff --git a/virt/kvm/arm/hypercalls.c b/virt/kvm/arm/hypercalls.c
new file mode 100644
index 000000000000..550dfa3e53cd
--- /dev/null
+++ b/virt/kvm/arm/hypercalls.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Arm Ltd.
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_emulate.h>
+
+#include <kvm/arm_hypercalls.h>
+#include <kvm/arm_psci.h>
+
+int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
+{
+ u32 func_id = smccc_get_function(vcpu);
+ long val = SMCCC_RET_NOT_SUPPORTED;
+ u32 feature;
+ gpa_t gpa;
+
+ switch (func_id) {
+ case ARM_SMCCC_VERSION_FUNC_ID:
+ val = ARM_SMCCC_VERSION_1_1;
+ break;
+ case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
+ feature = smccc_get_arg1(vcpu);
+ switch (feature) {
+ case ARM_SMCCC_ARCH_WORKAROUND_1:
+ switch (kvm_arm_harden_branch_predictor()) {
+ case KVM_BP_HARDEN_UNKNOWN:
+ break;
+ case KVM_BP_HARDEN_WA_NEEDED:
+ val = SMCCC_RET_SUCCESS;
+ break;
+ case KVM_BP_HARDEN_NOT_REQUIRED:
+ val = SMCCC_RET_NOT_REQUIRED;
+ break;
+ }
+ break;
+ case ARM_SMCCC_ARCH_WORKAROUND_2:
+ switch (kvm_arm_have_ssbd()) {
+ case KVM_SSBD_FORCE_DISABLE:
+ case KVM_SSBD_UNKNOWN:
+ break;
+ case KVM_SSBD_KERNEL:
+ val = SMCCC_RET_SUCCESS;
+ break;
+ case KVM_SSBD_FORCE_ENABLE:
+ case KVM_SSBD_MITIGATED:
+ val = SMCCC_RET_NOT_REQUIRED;
+ break;
+ }
+ break;
+ case ARM_SMCCC_HV_PV_TIME_FEATURES:
+ val = SMCCC_RET_SUCCESS;
+ break;
+ }
+ break;
+ case ARM_SMCCC_HV_PV_TIME_FEATURES:
+ val = kvm_hypercall_pv_features(vcpu);
+ break;
+ case ARM_SMCCC_HV_PV_TIME_ST:
+ gpa = kvm_init_stolen_time(vcpu);
+ if (gpa != GPA_INVALID)
+ val = gpa;
+ break;
+ default:
+ return kvm_psci_call(vcpu);
+ }
+
+ smccc_set_retval(vcpu, val, 0, 0, 0);
+ return 1;
+}
diff --git a/virt/kvm/arm/mmio.c b/virt/kvm/arm/mmio.c
index 6af5c91337f2..70d3b449692c 100644
--- a/virt/kvm/arm/mmio.c
+++ b/virt/kvm/arm/mmio.c
@@ -167,7 +167,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
if (ret)
return ret;
} else {
- kvm_err("load/store instruction decoding not implemented\n");
+ if (vcpu->kvm->arch.return_nisv_io_abort_to_user) {
+ run->exit_reason = KVM_EXIT_ARM_NISV;
+ run->arm_nisv.esr_iss = kvm_vcpu_dabt_iss_nisv_sanitized(vcpu);
+ run->arm_nisv.fault_ipa = fault_ipa;
+ return 0;
+ }
+
+ kvm_pr_unimpl("Data abort outside memslots with no valid syndrome info\n");
return -ENOSYS;
}
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 38b4c910b6c3..0b32a904a1bb 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -38,6 +38,11 @@ static unsigned long io_map_base;
#define KVM_S2PTE_FLAG_IS_IOMAP (1UL << 0)
#define KVM_S2_FLAG_LOGGING_ACTIVE (1UL << 1)
+static bool is_iomap(unsigned long flags)
+{
+ return flags & KVM_S2PTE_FLAG_IS_IOMAP;
+}
+
static bool memslot_is_logging(struct kvm_memory_slot *memslot)
{
return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY);
@@ -1698,6 +1703,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
vma_pagesize = vma_kernel_pagesize(vma);
if (logging_active ||
+ (vma->vm_flags & VM_PFNMAP) ||
!fault_supports_stage2_huge_mapping(memslot, hva, vma_pagesize)) {
force_pte = true;
vma_pagesize = PAGE_SIZE;
@@ -1760,6 +1766,9 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
writable = false;
}
+ if (exec_fault && is_iomap(flags))
+ return -ENOEXEC;
+
spin_lock(&kvm->mmu_lock);
if (mmu_notifier_retry(kvm, mmu_seq))
goto out_unlock;
@@ -1781,7 +1790,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
if (writable)
kvm_set_pfn_dirty(pfn);
- if (fault_status != FSC_PERM)
+ if (fault_status != FSC_PERM && !is_iomap(flags))
clean_dcache_guest_page(pfn, vma_pagesize);
if (exec_fault)
@@ -1948,9 +1957,8 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
if (kvm_is_error_hva(hva) || (write_fault && !writable)) {
if (is_iabt) {
/* Prefetch Abort on I/O address */
- kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
- ret = 1;
- goto out_unlock;
+ ret = -ENOEXEC;
+ goto out;
}
/*
@@ -1992,6 +2000,11 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status);
if (ret == 0)
ret = 1;
+out:
+ if (ret == -ENOEXEC) {
+ kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+ ret = 1;
+ }
out_unlock:
srcu_read_unlock(&vcpu->kvm->srcu, idx);
return ret;
@@ -2302,15 +2315,6 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
break;
/*
- * Mapping a read-only VMA is only allowed if the
- * memory region is configured as read-only.
- */
- if (writable && !(vma->vm_flags & VM_WRITE)) {
- ret = -EPERM;
- break;
- }
-
- /*
* Take the intersection of this VMA with the memory region
*/
vm_start = max(hva, vma->vm_start);
diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
index 87927f7e1ee7..17e2bdd4b76f 100644
--- a/virt/kvm/arm/psci.c
+++ b/virt/kvm/arm/psci.c
@@ -15,6 +15,7 @@
#include <asm/kvm_host.h>
#include <kvm/arm_psci.h>
+#include <kvm/arm_hypercalls.h>
/*
* This is an implementation of the Power State Coordination Interface
@@ -23,38 +24,6 @@
#define AFFINITY_MASK(level) ~((0x1UL << ((level) * MPIDR_LEVEL_BITS)) - 1)
-static u32 smccc_get_function(struct kvm_vcpu *vcpu)
-{
- return vcpu_get_reg(vcpu, 0);
-}
-
-static unsigned long smccc_get_arg1(struct kvm_vcpu *vcpu)
-{
- return vcpu_get_reg(vcpu, 1);
-}
-
-static unsigned long smccc_get_arg2(struct kvm_vcpu *vcpu)
-{
- return vcpu_get_reg(vcpu, 2);
-}
-
-static unsigned long smccc_get_arg3(struct kvm_vcpu *vcpu)
-{
- return vcpu_get_reg(vcpu, 3);
-}
-
-static void smccc_set_retval(struct kvm_vcpu *vcpu,
- unsigned long a0,
- unsigned long a1,
- unsigned long a2,
- unsigned long a3)
-{
- vcpu_set_reg(vcpu, 0, a0);
- vcpu_set_reg(vcpu, 1, a1);
- vcpu_set_reg(vcpu, 2, a2);
- vcpu_set_reg(vcpu, 3, a3);
-}
-
static unsigned long psci_affinity_mask(unsigned long affinity_level)
{
if (affinity_level <= 3)
@@ -373,7 +342,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
* Errors:
* -EINVAL: Unrecognized PSCI function
*/
-static int kvm_psci_call(struct kvm_vcpu *vcpu)
+int kvm_psci_call(struct kvm_vcpu *vcpu)
{
switch (kvm_psci_version(vcpu, vcpu->kvm)) {
case KVM_ARM_PSCI_1_0:
@@ -387,55 +356,6 @@ static int kvm_psci_call(struct kvm_vcpu *vcpu)
};
}
-int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
-{
- u32 func_id = smccc_get_function(vcpu);
- u32 val = SMCCC_RET_NOT_SUPPORTED;
- u32 feature;
-
- switch (func_id) {
- case ARM_SMCCC_VERSION_FUNC_ID:
- val = ARM_SMCCC_VERSION_1_1;
- break;
- case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
- feature = smccc_get_arg1(vcpu);
- switch(feature) {
- case ARM_SMCCC_ARCH_WORKAROUND_1:
- switch (kvm_arm_harden_branch_predictor()) {
- case KVM_BP_HARDEN_UNKNOWN:
- break;
- case KVM_BP_HARDEN_WA_NEEDED:
- val = SMCCC_RET_SUCCESS;
- break;
- case KVM_BP_HARDEN_NOT_REQUIRED:
- val = SMCCC_RET_NOT_REQUIRED;
- break;
- }
- break;
- case ARM_SMCCC_ARCH_WORKAROUND_2:
- switch (kvm_arm_have_ssbd()) {
- case KVM_SSBD_FORCE_DISABLE:
- case KVM_SSBD_UNKNOWN:
- break;
- case KVM_SSBD_KERNEL:
- val = SMCCC_RET_SUCCESS;
- break;
- case KVM_SSBD_FORCE_ENABLE:
- case KVM_SSBD_MITIGATED:
- val = SMCCC_RET_NOT_REQUIRED;
- break;
- }
- break;
- }
- break;
- default:
- return kvm_psci_call(vcpu);
- }
-
- smccc_set_retval(vcpu, val, 0, 0, 0);
- return 1;
-}
-
int kvm_arm_get_fw_num_regs(struct kvm_vcpu *vcpu)
{
return 3; /* PSCI version and two workaround registers */
diff --git a/virt/kvm/arm/pvtime.c b/virt/kvm/arm/pvtime.c
new file mode 100644
index 000000000000..1e0f4c284888
--- /dev/null
+++ b/virt/kvm/arm/pvtime.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Arm Ltd.
+
+#include <linux/arm-smccc.h>
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_mmu.h>
+#include <asm/pvclock-abi.h>
+
+#include <kvm/arm_hypercalls.h>
+
+void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ u64 steal;
+ __le64 steal_le;
+ u64 offset;
+ int idx;
+ u64 base = vcpu->arch.steal.base;
+
+ if (base == GPA_INVALID)
+ return;
+
+ /* Let's do the local bookkeeping */
+ steal = vcpu->arch.steal.steal;
+ steal += current->sched_info.run_delay - vcpu->arch.steal.last_steal;
+ vcpu->arch.steal.last_steal = current->sched_info.run_delay;
+ vcpu->arch.steal.steal = steal;
+
+ steal_le = cpu_to_le64(steal);
+ idx = srcu_read_lock(&kvm->srcu);
+ offset = offsetof(struct pvclock_vcpu_stolen_time, stolen_time);
+ kvm_put_guest(kvm, base + offset, steal_le, u64);
+ srcu_read_unlock(&kvm->srcu, idx);
+}
+
+long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
+{
+ u32 feature = smccc_get_arg1(vcpu);
+ long val = SMCCC_RET_NOT_SUPPORTED;
+
+ switch (feature) {
+ case ARM_SMCCC_HV_PV_TIME_FEATURES:
+ case ARM_SMCCC_HV_PV_TIME_ST:
+ val = SMCCC_RET_SUCCESS;
+ break;
+ }
+
+ return val;
+}
+
+gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
+{
+ struct pvclock_vcpu_stolen_time init_values = {};
+ struct kvm *kvm = vcpu->kvm;
+ u64 base = vcpu->arch.steal.base;
+ int idx;
+
+ if (base == GPA_INVALID)
+ return base;
+
+ /*
+ * Start counting stolen time from the time the guest requests
+ * the feature enabled.
+ */
+ vcpu->arch.steal.steal = 0;
+ vcpu->arch.steal.last_steal = current->sched_info.run_delay;
+
+ idx = srcu_read_lock(&kvm->srcu);
+ kvm_write_guest(kvm, base, &init_values, sizeof(init_values));
+ srcu_read_unlock(&kvm->srcu, idx);
+
+ return base;
+}
+
+int kvm_arm_pvtime_set_attr(struct kvm_vcpu *vcpu,
+ struct kvm_device_attr *attr)
+{
+ u64 __user *user = (u64 __user *)attr->addr;
+ struct kvm *kvm = vcpu->kvm;
+ u64 ipa;
+ int ret = 0;
+ int idx;
+
+ if (attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
+ return -ENXIO;
+
+ if (get_user(ipa, user))
+ return -EFAULT;
+ if (!IS_ALIGNED(ipa, 64))
+ return -EINVAL;
+ if (vcpu->arch.steal.base != GPA_INVALID)
+ return -EEXIST;
+
+ /* Check the address is in a valid memslot */
+ idx = srcu_read_lock(&kvm->srcu);
+ if (kvm_is_error_hva(gfn_to_hva(kvm, ipa >> PAGE_SHIFT)))
+ ret = -EINVAL;
+ srcu_read_unlock(&kvm->srcu, idx);
+
+ if (!ret)
+ vcpu->arch.steal.base = ipa;
+
+ return ret;
+}
+
+int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
+ struct kvm_device_attr *attr)
+{
+ u64 __user *user = (u64 __user *)attr->addr;
+ u64 ipa;
+
+ if (attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
+ return -ENXIO;
+
+ ipa = vcpu->arch.steal.base;
+
+ if (put_user(ipa, user))
+ return -EFAULT;
+ return 0;
+}
+
+int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
+ struct kvm_device_attr *attr)
+{
+ switch (attr->attr) {
+ case KVM_ARM_VCPU_PVTIME_IPA:
+ return 0;
+ }
+ return -ENXIO;
+}
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 6f50c429196d..a963b9d766b7 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -70,7 +70,7 @@ void kvm_vgic_early_init(struct kvm *kvm)
*/
int kvm_vgic_create(struct kvm *kvm, u32 type)
{
- int i, vcpu_lock_idx = -1, ret;
+ int i, ret;
struct kvm_vcpu *vcpu;
if (irqchip_in_kernel(kvm))
@@ -86,17 +86,9 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
!kvm_vgic_global_state.can_emulate_gicv2)
return -ENODEV;
- /*
- * Any time a vcpu is run, vcpu_load is called which tries to grab the
- * vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure
- * that no other VCPUs are run while we create the vgic.
- */
ret = -EBUSY;
- kvm_for_each_vcpu(i, vcpu, kvm) {
- if (!mutex_trylock(&vcpu->mutex))
- goto out_unlock;
- vcpu_lock_idx = i;
- }
+ if (!lock_all_vcpus(kvm))
+ return ret;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.has_run_once)
@@ -125,10 +117,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
INIT_LIST_HEAD(&kvm->arch.vgic.rd_regions);
out_unlock:
- for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
- vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
- mutex_unlock(&vcpu->mutex);
- }
+ unlock_all_vcpus(kvm);
return ret;
}
@@ -177,6 +166,7 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
break;
default:
kfree(dist->spis);
+ dist->spis = NULL;
return -EINVAL;
}
}
@@ -203,6 +193,7 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
raw_spin_lock_init(&vgic_cpu->ap_list_lock);
+ atomic_set(&vgic_cpu->vgic_v3.its_vpe.vlpi_count, 0);
/*
* Enable and configure all SGIs to be edge-triggered and
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 2be6b66b3856..98c7360d9fb7 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -360,7 +360,10 @@ static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
if (ret)
return ret;
+ if (map.vpe)
+ atomic_dec(&map.vpe->vlpi_count);
map.vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+ atomic_inc(&map.vpe->vlpi_count);
ret = its_map_vlpi(irq->host_irq, &map);
}
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index 8d69f007dd0c..f45635a6f0ec 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -357,14 +357,14 @@ retry:
}
/**
- * vgic_its_save_pending_tables - Save the pending tables into guest RAM
+ * vgic_v3_save_pending_tables - Save the pending tables into guest RAM
* kvm lock and all vcpu lock must be held
*/
int vgic_v3_save_pending_tables(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
- int last_byte_offset = -1;
struct vgic_irq *irq;
+ gpa_t last_ptr = ~(gpa_t)0;
int ret;
u8 val;
@@ -384,11 +384,11 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
bit_nr = irq->intid % BITS_PER_BYTE;
ptr = pendbase + byte_offset;
- if (byte_offset != last_byte_offset) {
+ if (ptr != last_ptr) {
ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
- last_byte_offset = byte_offset;
+ last_ptr = ptr;
}
stored = val & (1U << bit_nr);
@@ -664,6 +664,8 @@ void vgic_v3_load(struct kvm_vcpu *vcpu)
if (has_vhe())
__vgic_v3_activate_traps(vcpu);
+
+ WARN_ON(vgic_v4_load(vcpu));
}
void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
@@ -676,6 +678,8 @@ void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
void vgic_v3_put(struct kvm_vcpu *vcpu)
{
+ WARN_ON(vgic_v4_put(vcpu, false));
+
vgic_v3_vmcr_sync(vcpu);
kvm_call_hyp(__vgic_v3_save_aprs, vcpu);
diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
index 477af6aebb97..46f875589c47 100644
--- a/virt/kvm/arm/vgic/vgic-v4.c
+++ b/virt/kvm/arm/vgic/vgic-v4.c
@@ -85,6 +85,10 @@ static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info)
{
struct kvm_vcpu *vcpu = info;
+ /* We got the message, no need to fire again */
+ if (!irqd_irq_disabled(&irq_to_desc(irq)->irq_data))
+ disable_irq_nosync(irq);
+
vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last = true;
kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
kvm_vcpu_kick(vcpu);
@@ -192,20 +196,30 @@ void vgic_v4_teardown(struct kvm *kvm)
its_vm->vpes = NULL;
}
-int vgic_v4_sync_hwstate(struct kvm_vcpu *vcpu)
+int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db)
{
- if (!vgic_supports_direct_msis(vcpu->kvm))
+ struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
+ struct irq_desc *desc = irq_to_desc(vpe->irq);
+
+ if (!vgic_supports_direct_msis(vcpu->kvm) || !vpe->resident)
return 0;
- return its_schedule_vpe(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe, false);
+ /*
+ * If blocking, a doorbell is required. Undo the nested
+ * disable_irq() calls...
+ */
+ while (need_db && irqd_irq_disabled(&desc->irq_data))
+ enable_irq(vpe->irq);
+
+ return its_schedule_vpe(vpe, false);
}
-int vgic_v4_flush_hwstate(struct kvm_vcpu *vcpu)
+int vgic_v4_load(struct kvm_vcpu *vcpu)
{
- int irq = vcpu->arch.vgic_cpu.vgic_v3.its_vpe.irq;
+ struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe;
int err;
- if (!vgic_supports_direct_msis(vcpu->kvm))
+ if (!vgic_supports_direct_msis(vcpu->kvm) || vpe->resident)
return 0;
/*
@@ -214,11 +228,14 @@ int vgic_v4_flush_hwstate(struct kvm_vcpu *vcpu)
* doc in drivers/irqchip/irq-gic-v4.c to understand how this
* turns into a VMOVP command at the ITS level.
*/
- err = irq_set_affinity(irq, cpumask_of(smp_processor_id()));
+ err = irq_set_affinity(vpe->irq, cpumask_of(smp_processor_id()));
if (err)
return err;
- err = its_schedule_vpe(&vcpu->arch.vgic_cpu.vgic_v3.its_vpe, true);
+ /* Disabled the doorbell, as we're about to enter the guest */
+ disable_irq_nosync(vpe->irq);
+
+ err = its_schedule_vpe(vpe, true);
if (err)
return err;
@@ -226,9 +243,7 @@ int vgic_v4_flush_hwstate(struct kvm_vcpu *vcpu)
* Now that the VPE is resident, let's get rid of a potential
* doorbell interrupt that would still be pending.
*/
- err = irq_set_irqchip_state(irq, IRQCHIP_STATE_PENDING, false);
-
- return err;
+ return irq_set_irqchip_state(vpe->irq, IRQCHIP_STATE_PENDING, false);
}
static struct vgic_its *vgic_get_its(struct kvm *kvm,
@@ -266,7 +281,7 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
mutex_lock(&its->its_lock);
- /* Perform then actual DevID/EventID -> LPI translation. */
+ /* Perform the actual DevID/EventID -> LPI translation. */
ret = vgic_its_resolve_lpi(kvm, its, irq_entry->msi.devid,
irq_entry->msi.data, &irq);
if (ret)
@@ -294,6 +309,7 @@ int kvm_vgic_v4_set_forwarding(struct kvm *kvm, int virq,
irq->hw = true;
irq->host_irq = virq;
+ atomic_inc(&map.vpe->vlpi_count);
out:
mutex_unlock(&its->its_lock);
@@ -327,6 +343,7 @@ int kvm_vgic_v4_unset_forwarding(struct kvm *kvm, int virq,
WARN_ON(!(irq->hw && irq->host_irq == virq));
if (irq->hw) {
+ atomic_dec(&irq->target_vcpu->arch.vgic_cpu.vgic_v3.its_vpe.vlpi_count);
irq->hw = false;
ret = its_unmap_vlpi(virq);
}
@@ -335,21 +352,3 @@ out:
mutex_unlock(&its->its_lock);
return ret;
}
-
-void kvm_vgic_v4_enable_doorbell(struct kvm_vcpu *vcpu)
-{
- if (vgic_supports_direct_msis(vcpu->kvm)) {
- int irq = vcpu->arch.vgic_cpu.vgic_v3.its_vpe.irq;
- if (irq)
- enable_irq(irq);
- }
-}
-
-void kvm_vgic_v4_disable_doorbell(struct kvm_vcpu *vcpu)
-{
- if (vgic_supports_direct_msis(vcpu->kvm)) {
- int irq = vcpu->arch.vgic_cpu.vgic_v3.its_vpe.irq;
- if (irq)
- disable_irq(irq);
- }
-}
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 45a870cb63f5..99b02ca730a8 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -857,8 +857,6 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- WARN_ON(vgic_v4_sync_hwstate(vcpu));
-
/* An empty ap_list_head implies used_lrs == 0 */
if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head))
return;
@@ -882,8 +880,6 @@ static inline void vgic_restore_state(struct kvm_vcpu *vcpu)
/* Flush our emulation state into the GIC hardware before entering the guest. */
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
{
- WARN_ON(vgic_v4_flush_hwstate(vcpu));
-
/*
* If there are no virtual interrupts active or pending for this
* VCPU, then there is no work to do and we can bail out without
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 83066a81b16a..c7fefd6b1c80 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -316,7 +316,5 @@ void vgic_its_invalidate_cache(struct kvm *kvm);
bool vgic_supports_direct_msis(struct kvm *kvm);
int vgic_v4_init(struct kvm *kvm);
void vgic_v4_teardown(struct kvm *kvm);
-int vgic_v4_sync_hwstate(struct kvm_vcpu *vcpu);
-int vgic_v4_flush_hwstate(struct kvm_vcpu *vcpu);
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-30 21:19:12 +0000