---

yaml --- r: 202278 b: refs/heads/master c: aad8270 h: refs/heads/master v: v3
git-mirror · Aug 1, 2010 · 6533c3a · 6533c3a
1 parent d6cafdf
commit 6533c3a
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Showing 2 changed files with 15 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 62ad07551a2ace89e35604d1c55fdae1dd3359a8
+refs/heads/master: aad827034e419fa8c5ec39e6455266f0b942d856
diff --git a/trunk/arch/x86/kvm/x86.c b/trunk/arch/x86/kvm/x86.c
@@ -416,6 +416,10 @@ static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 
 static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
+	unsigned long old_cr0 = kvm_read_cr0(vcpu);
+	unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
+				    X86_CR0_CD | X86_CR0_NW;
+
 	cr0 |= X86_CR0_ET;
 
 #ifdef CONFIG_X86_64
@@ -449,7 +453,8 @@ static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 
 	kvm_x86_ops->set_cr0(vcpu, cr0);
 
-	kvm_mmu_reset_context(vcpu);
+	if ((cr0 ^ old_cr0) & update_bits)
+		kvm_mmu_reset_context(vcpu);
 	return 0;
 }
 
@@ -487,7 +492,8 @@ int __kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 
 	kvm_x86_ops->set_cr4(vcpu, cr4);
 
-	kvm_mmu_reset_context(vcpu);
+	if ((cr4 ^ old_cr4) & pdptr_bits)
+		kvm_mmu_reset_context(vcpu);
 
 	return 0;
 }
@@ -693,6 +699,8 @@ static u32 emulated_msrs[] = {
 
 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 {
+	u64 old_efer = vcpu->arch.efer;
+
 	if (efer & efer_reserved_bits)
 		return 1;
 
@@ -724,6 +732,10 @@ static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 	vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 	kvm_mmu_reset_context(vcpu);
 
+	/* Update reserved bits */
+	if ((efer ^ old_efer) & EFER_NX)
+		kvm_mmu_reset_context(vcpu);
+
 	return 0;
 }