linux-kernel - [PATCH] KVM: MMU: initialize sptes early

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Date:	Mon, 24 Oct 2011 15:21:18 +0800
From:	Zhao Jin <cronozhj@...il.com>
To:	avi@...hat.com, mtosatti@...hat.com
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH] KVM: MMU: initialize sptes early

Otherwise, the following kvm_sync_pages() will see invalid sptes in a new
shadow page.

Signed-off-by: Zhao Jin <cronozhj@...il.com>
---
 arch/x86/kvm/mmu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8e8da79..d7e1694 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1692,6 +1692,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 		return sp;
 	sp->gfn = gfn;
 	sp->role = role;
+	init_shadow_page_table(sp);
 	hlist_add_head(&sp->hash_link,
 		&vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]);
 	if (!direct) {
@@ -1702,7 +1703,6 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 
 		account_shadowed(vcpu->kvm, gfn);
 	}
-	init_shadow_page_table(sp);
 	trace_kvm_mmu_get_page(sp, true);
 	return sp;
 }
-- 
1.7.5.4

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