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KVM: x86 emulator: cleanup grp3 return value 

When x86_emulate_insn() does not know how to emulate instruction it
exits via cannot_emulate label in all cases except when emulating
grp3. Fix that.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2010-03-18 15:20:15 +02:00 committed by Avi Kivity
parent a41ffb7540
commit aca06a8307
1 changed files with 4 additions and 8 deletions
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12
arch/x86/kvm/emulate.c
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@ -1397,7 +1397,6 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
int rc = X86EMUL_CONTINUE;
switch (c->modrm_reg) {
case 0 ... 1: /* test */
@ -1410,11 +1409,9 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt,
emulate_1op("neg", c->dst, ctxt->eflags);
break;
default:
DPRINTF("Cannot emulate %02x\n", c->b);
rc = X86EMUL_UNHANDLEABLE;
break;
return 0;
}
return rc;
return 1;
}
static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt,
@ -2374,9 +2371,8 @@ special_insn:
c->dst.type = OP_NONE; /* Disable writeback. */
break;
case 0xf6 ... 0xf7: /* Grp3 */
rc = emulate_grp3(ctxt, ops);
if (rc != X86EMUL_CONTINUE)
goto done;
if (!emulate_grp3(ctxt, ops))
goto cannot_emulate;
break;
case 0xf8: /* clc */
ctxt->eflags &= ~EFLG_CF;