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Commit 30bfb3c4 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity
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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: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 27923eb1

arch/x86/kvm/paging_tmpl.h

+1 −0
Original line number Diff line number Diff line
@@ -786,6 +786,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, 
			else

				nonpresent = shadow_notrap_nonpresent_pte;

			drop_spte(vcpu->kvm, &sp->spt[i], nonpresent);

			kvm_flush_remote_tlbs(vcpu->kvm);

			continue;

		}