KVM: x86 emulator: cleanup nop emulation
Make it more explicit what we are checking for.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index a99d49c..03a7291 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2799,8 +2799,8 @@
goto done;
break;
case 0x90: /* nop / xchg r8,rax */
- if (!(c->rex_prefix & 1)) { /* nop */
- c->dst.type = OP_NONE;
+ if (c->dst.ptr == (unsigned long *)&c->regs[VCPU_REGS_RAX]) {
+ c->dst.type = OP_NONE; /* nop */
break;
}
case 0x91 ... 0x97: /* xchg reg,rax */