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KVM: MMU: fix forgot flush tlbs on sync_page path 

We should flush all tlbs after drop spte on sync_page path since

Quote from Avi:
| sync_page
| drop_spte
| kvm_mmu_notifier_invalidate_page
| kvm_unmap_rmapp
| spte doesn't exist -> no flush
| page is freed
| guest can write into freed page?

KVM-Stable-Tag.
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-11-19 17:01:40 +08:00 committed by Avi Kivity
parent 27923eb19c
commit 30bfb3c425
1 changed files with 1 additions and 0 deletions
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1
arch/x86/kvm/paging_tmpl.h
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@ -786,6 +786,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
else else
nonpresent = shadow_notrap_nonpresent_pte; nonpresent = shadow_notrap_nonpresent_pte;
drop_spte(vcpu->kvm, &sp->spt[i], nonpresent); drop_spte(vcpu->kvm, &sp->spt[i], nonpresent);
kvm_flush_remote_tlbs(vcpu->kvm);
continue; continue;
} }