linux-kernel - [PATCH 2/5] KVM MMU: remove rmap before clear spte

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Message-ID: <4BEB5EC4.6070802@cn.fujitsu.com>
Date:	Thu, 13 May 2010 10:07:00 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/5] KVM MMU: remove rmap before clear spte

Remove rmap before clear spte otherwise it will trigger BUG_ON() in
some functions such as rmap_write_protect()

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

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 67da751..a474d93 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1812,6 +1812,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 		if (level > PT_PAGE_TABLE_LEVEL &&
 		    has_wrprotected_page(vcpu->kvm, gfn, level)) {
 			ret = 1;
+			rmap_remove(vcpu->kvm, sptep);
 			spte = shadow_trap_nonpresent_pte;
 			goto set_pte;
 		}
-- 
1.6.1.2


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