KVM: SVM: Fix FPU leak while emulating clts

patch 404fb881 in mainline.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/kvm/kvm_main.c

@@ -1163,10 +1163,7 @@ int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
 
 int emulate_clts(struct kvm_vcpu *vcpu)
 {
-	unsigned long cr0;
-
-	cr0 = vcpu->cr0 & ~CR0_TS_MASK;
-	kvm_arch_ops->set_cr0(vcpu, cr0);
+	kvm_arch_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
 	return X86EMUL_CONTINUE;
 }