From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Date: Fri, 31 May 2013 00:36:26 +0000 (+0800)
Subject: KVM: MMU: do not reuse the obsolete page
X-Git-Tag: v3.12-rc1~503^2~44
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7f52af7412275c0d23becfc325331ec8b5ff2458;p=kernel%2Fkernel-generic.git

KVM: MMU: do not reuse the obsolete page

The obsolete page will be zapped soon, do not reuse it to
reduce future page fault

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 3fd060a..0880b9b4 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1875,6 +1875,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 		role.quadrant = quadrant;
 	}
 	for_each_gfn_sp(vcpu->kvm, sp, gfn) {
+		if (is_obsolete_sp(vcpu->kvm, sp))
+			continue;
+
 		if (!need_sync && sp->unsync)
 			need_sync = true;