KVM: x86 emulator: emulate CLTS internally
Avoid using ctxt->vcpu; we can do everything with ->get_cr() and ->set_cr().
A side effect is that we no longer activate the fpu on emulated CLTS; but that
should be very rare.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 6a51253..2b903a3 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2579,6 +2579,16 @@
return X86EMUL_CONTINUE;
}
+static int em_clts(struct x86_emulate_ctxt *ctxt)
+{
+ ulong cr0;
+
+ cr0 = ctxt->ops->get_cr(ctxt, 0);
+ cr0 &= ~X86_CR0_TS;
+ ctxt->ops->set_cr(ctxt, 0, cr0);
+ return X86EMUL_CONTINUE;
+}
+
static bool valid_cr(int nr)
{
switch (nr) {
@@ -4079,7 +4089,7 @@
rc = emulate_syscall(ctxt, ops);
break;
case 0x06:
- emulate_clts(ctxt->vcpu);
+ rc = em_clts(ctxt);
break;
case 0x09: /* wbinvd */
kvm_emulate_wbinvd(ctxt->vcpu);