[PATCH v3 1/6] KVM: MMU: fix forgot flush tlbs on sync_page path

[Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>]

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? 

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
 arch/x86/kvm/paging_tmpl.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 590bf12..ca0e5e8 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -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;
 		}
 
-- 
1.7.0.4