linux-kernel - [PATCH] KVM: MMU: fix hugepage mapping corrupt caused by regression

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Message-ID: <4C492597.2000802@cn.fujitsu.com>
Date:	Fri, 23 Jul 2010 13:16:07 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: [PATCH] KVM: MMU: fix hugepage mapping corrupt caused by regression

This is the regression, the bug which is fixed by commit e09e90a5
is active now

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 arch/x86/kvm/paging_tmpl.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index a09e04c..d9a2742 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -374,13 +374,13 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 	     shadow_walk_next(&it)) {
 		gfn_t direct_gfn;
 
+		validate_direct_spte(vcpu, it.sptep, direct_access);
+
 		drop_large_spte(vcpu, it.sptep);
 
 		if (is_shadow_present_pte(*it.sptep))
 			continue;
 
-		validate_direct_spte(vcpu, it.sptep, direct_access);
-
 		direct_gfn = gw->gfn & ~(KVM_PAGES_PER_HPAGE(it.level) - 1);
 
 		sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,
-- 
1.6.1.2


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