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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>
This commit is contained in:
Marcelo Tosatti 2008-11-21 19:13:58 +01:00 committed by Avi Kivity
parent ce50b91d0f
commit 0c0f40bdbe
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu.c
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@ -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;
}