From e5eab0cede4b1ffaca4ad857d840127622038e55 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 9 Sep 2008 19:11:51 +0200
Subject: KVM: SVM: fix guest global tlb flushes with NPT
Accesses to CR4 are intercepted even with Nested Paging enabled. But the code
does not check if the guest wants to do a global TLB flush. So this flush gets
lost. This patch adds the check and the flush to svm_set_cr4.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
arch/x86/kvm/svm.c | 4 ++++
1 file changed, 4 insertions(+)
(limited to 'arch/x86/kvm')
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d1106cd..8233b86 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -879,6 +879,10 @@ set:
static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
+ unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
+
+ if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
+ force_new_asid(vcpu);
vcpu->arch.cr4 = cr4;
if (!npt_enabled)
--
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