From 6da63cf95f6a19fe0a302232048452c96b178e45 Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@qumranet.com>
Date: Wed, 21 Mar 2007 18:11:36 +0200
Subject: KVM: Don't allow the guest to turn off the cpu cache

The cpu cache is a host resource; the guest should not be able to turn
it off (even for itself).

Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index d3cc115..191bc45 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -737,8 +737,10 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 	}
 #endif
 	vcpu->svm->cr0 = cr0;
-	vcpu->svm->vmcb->save.cr0 = cr0 | CR0_PG_MASK | CR0_WP_MASK;
 	vcpu->cr0 = cr0;
+	cr0 |= CR0_PG_MASK | CR0_WP_MASK;
+	cr0 &= ~(CR0_CD_MASK | CR0_NW_MASK);
+	vcpu->svm->vmcb->save.cr0 = cr0;
 }
 
 static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
-- 
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