linux-kernel - [PATCH 2/10] KVM: MMU: fix kvm_mmu_get_spte

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Message-ID: <4D70C597.4070105@cn.fujitsu.com>
Date:	Fri, 04 Mar 2011 18:57:27 +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 <kvm@...r.kernel.org>
Subject: [PATCH 2/10] KVM: MMU: fix kvm_mmu_get_spte_hierarchy

Don not walk to the next level if spte is mapping to the large page

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 arch/x86/kvm/mmu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b9bf016..10e0982 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3819,7 +3819,8 @@ int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4])
 	for_each_shadow_entry(vcpu, addr, iterator) {
 		sptes[iterator.level-1] = *iterator.sptep;
 		nr_sptes++;
-		if (!is_shadow_present_pte(*iterator.sptep))
+		if (!is_shadow_present_pte(*iterator.sptep) ||
+		      is_last_spte(*iterator.sptep, iterator.level))
 			break;
 	}
 	spin_unlock(&vcpu->kvm->mmu_lock);
-- 
1.7.4

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