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authorMarcelo Tosatti <mtosatti@redhat.com>2008-11-21 19:13:58 +0100
committerAvi Kivity <avi@redhat.com>2008-11-23 15:24:19 +0200
commit0c0f40bdbe4ddb48ebecfb5c2b56eeb175a57c45 (patch)
tree5fc295c2999bcfe9d4860d1cac012188e46a82aa /arch/x86/kvm
parentce50b91d0f7b0b90e3960a6f306b4027378c7c27 (diff)
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>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/mmu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index f1983d9477c..410ddbc1aa2 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;
}