From: Amit Shah <amit.shah@qumranet.com>
Date: Mon, 19 Nov 2007 15:57:35 +0000 (+0200)
Subject: KVM: SVM: Fix FPU leak while emulating clts
X-Git-Tag: v2.6.24-rc4~86^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=404fb881b82cf0cf6981832f8d31a7484e4dee81;p=linux-2.6

KVM: SVM: Fix FPU leak while emulating clts

The clts code didn't use set_cr0 properly, so our lazy FPU
processing wasn't being done by the clts instruction at all.

(this isn't called on Intel as the hardware does the decode for us)

Signed-off-by: Amit Shah <amit.shah@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 07ae280e8f..47c10b8f89 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1188,8 +1188,7 @@ int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
 
 int emulate_clts(struct kvm_vcpu *vcpu)
 {
-	vcpu->cr0 &= ~X86_CR0_TS;
-	kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
+	kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
 	return X86EMUL_CONTINUE;
 }