diff options
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index e0c225421157..1d971c7553c3 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -960,6 +960,12 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) return 0; if (FNAME(prefetch_invalid_gpte)(vcpu, sp, &sp->spt[i], gpte)) { + /* + * Update spte before increasing tlbs_dirty to make + * sure no tlb flush is lost after spte is zapped; see + * the comments in kvm_flush_remote_tlbs(). + */ + smp_wmb(); vcpu->kvm->tlbs_dirty++; continue; } @@ -975,6 +981,11 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) if (gfn != sp->gfns[i]) { drop_spte(vcpu->kvm, &sp->spt[i]); + /* + * The same as above where we are doing + * prefetch_invalid_gpte(). + */ + smp_wmb(); vcpu->kvm->tlbs_dirty++; continue; } |