diff options
| -rw-r--r-- | arch/x86/kvm/mmu/paging_tmpl.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index c07b2e7def37..4047b8ff83d6 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -985,6 +985,14 @@ static int FNAME(sync_spte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, int drop_spte(vcpu->kvm, &sp->spt[i]); return 1; } + /* + * Do nothing if the permissions are unchanged. The existing SPTE is + * still, and prefetch_invalid_gpte() has verified that the A/D bits + * are set in the "new" gPTE, i.e. there is no danger of missing an A/D + * update due to A/D bits being set in the SPTE but not the gPTE. + */ + if (kvm_mmu_page_get_access(sp, i) == pte_access) + return 0; /* Update the shadowed access bits in case they changed. */ kvm_mmu_page_set_access(sp, i, pte_access); |