Commit 0c0f40bd authored Nov 21, 2008 by Marcelo Tosatti Committed by Avi Kivity Nov 23, 2008

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 <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

parent ce50b91d

arch/x86/kvm/mmu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}