From: Marcelo Tosatti Date: Fri, 21 Nov 2008 18:13:58 +0000 (+0100) Subject: KVM: MMU: fix sync of ptes addressed at owner pagetable X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0c0f40bdbe4ddb48ebecfb5c2b56eeb175a57c45;p=linux-beck.git KVM: MMU: fix sync of ptes addressed at owner pagetable During page sync, if a pagetable contains a self referencing pte (that points to the pagetable), the corresponding spte may be marked as writable even though all mappings are supposed to be write protected. Fix by clearing page unsync before syncing individual sptes. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index f1983d9477cd..410ddbc1aa2e 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1038,13 +1038,13 @@ static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) } rmap_write_protect(vcpu->kvm, sp->gfn); + kvm_unlink_unsync_page(vcpu->kvm, sp); if (vcpu->arch.mmu.sync_page(vcpu, sp)) { kvm_mmu_zap_page(vcpu->kvm, sp); return 1; } kvm_mmu_flush_tlb(vcpu); - kvm_unlink_unsync_page(vcpu->kvm, sp); return 0; }