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KVM: nVMX: Plumb L2 GPA through to PML emulation

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Explicitly pass the L2 GPA to kvm_arch_write_log_dirty(), which for all
intents and purposes is vmx_write_pml_buffer(), instead of having the
latter pull the GPA from vmcs.GUEST_PHYSICAL_ADDRESS.  If the dirty bit
update is the result of KVM emulation (rare for L2), then the GPA in the
VMCS may be stale and/or hold a completely unrelated GPA.

Fixes: c5f983f6e8 ("nVMX: Implement emulated Page Modification Logging")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200622215832.22090-2-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-06-22 14:58:29 -07:00 committed by Paolo Bonzini
parent 312d16c7c0
commit 2dbebf7ae1
5 changed files with 11 additions and 10 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -1220,7 +1220,7 @@ struct kvm_x86_ops {
void (*enable_log_dirty_pt_masked)(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t offset, unsigned long mask);
int (*write_log_dirty)(struct kvm_vcpu *vcpu);
int (*write_log_dirty)(struct kvm_vcpu *vcpu, gpa_t l2_gpa);
/* pmu operations of sub-arch */
const struct kvm_pmu_ops *pmu_ops;

2
arch/x86/kvm/mmu.h
View File

@ -222,7 +222,7 @@ void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
struct kvm_memory_slot *slot, u64 gfn);
int kvm_arch_write_log_dirty(struct kvm_vcpu *vcpu);
int kvm_arch_write_log_dirty(struct kvm_vcpu *vcpu, gpa_t l2_gpa);
int kvm_mmu_post_init_vm(struct kvm *kvm);
void kvm_mmu_pre_destroy_vm(struct kvm *kvm);

4
arch/x86/kvm/mmu/mmu.c
View File

@ -1745,10 +1745,10 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
* Emulate arch specific page modification logging for the
* nested hypervisor
*/
int kvm_arch_write_log_dirty(struct kvm_vcpu *vcpu)
int kvm_arch_write_log_dirty(struct kvm_vcpu *vcpu, gpa_t l2_gpa)
{
if (kvm_x86_ops.write_log_dirty)
return kvm_x86_ops.write_log_dirty(vcpu);
return kvm_x86_ops.write_log_dirty(vcpu, l2_gpa);
return 0;
}

7
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -235,7 +235,7 @@ static inline unsigned FNAME(gpte_access)(u64 gpte)
static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu,
struct kvm_mmu *mmu,
struct guest_walker *walker,
int write_fault)
gpa_t addr, int write_fault)
{
unsigned level, index;
pt_element_t pte, orig_pte;
@ -260,7 +260,7 @@ static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu,
!(pte & PT_GUEST_DIRTY_MASK)) {
trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte));
#if PTTYPE == PTTYPE_EPT
if (kvm_arch_write_log_dirty(vcpu))
if (kvm_arch_write_log_dirty(vcpu, addr))
return -EINVAL;
#endif
pte |= PT_GUEST_DIRTY_MASK;
@ -454,7 +454,8 @@ retry_walk:
(PT_GUEST_DIRTY_SHIFT - PT_GUEST_ACCESSED_SHIFT);
if (unlikely(!accessed_dirty)) {
ret = FNAME(update_accessed_dirty_bits)(vcpu, mmu, walker, write_fault);
ret = FNAME(update_accessed_dirty_bits)(vcpu, mmu, walker,
addr, write_fault);
if (unlikely(ret < 0))
goto error;
else if (ret)

6
arch/x86/kvm/vmx/vmx.c
View File

@ -7500,11 +7500,11 @@ static void vmx_flush_log_dirty(struct kvm *kvm)
kvm_flush_pml_buffers(kvm);
}
static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu)
static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu, gpa_t gpa)
{
struct vmcs12 *vmcs12;
struct vcpu_vmx *vmx = to_vmx(vcpu);
gpa_t gpa, dst;
gpa_t dst;
if (is_guest_mode(vcpu)) {
WARN_ON_ONCE(vmx->nested.pml_full);
@ -7523,7 +7523,7 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu)
return 1;
}
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS) & ~0xFFFull;
gpa &= ~0xFFFull;
dst = vmcs12->pml_address + sizeof(u64) * vmcs12->guest_pml_index;
if (kvm_write_guest_page(vcpu->kvm, gpa_to_gfn(dst), &gpa,