linux-kernel - [PATCH v3 1/6] KVM: MMU: fix forgot flush tlbs on sync

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Message-ID: <4CE63CF4.80502@cn.fujitsu.com>
Date:	Fri, 19 Nov 2010 17:01:40 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, KVM <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 1/6] 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? 

Signed-off-by: Xiao Guangrong <xiaoguangrong@...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
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