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KVM: emulate: move around some checks 

The only purpose of this patch is to make the next patch simpler
to review.  No semantic change.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-03-27 12:00:57 +01:00
parent 6addfc4299
commit e24186e097
1 changed files with 11 additions and 8 deletions
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19
arch/x86/kvm/emulate.c
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@ -4388,12 +4388,15 @@ done_prefixes:
ctxt->d |= opcode.flags;
}
/* Unrecognised? */
if (ctxt->d == 0)
return EMULATION_FAILED;
ctxt->execute = opcode.u.execute;
ctxt->check_perm = opcode.check_perm;
ctxt->intercept = opcode.intercept;
/* Unrecognised? */
if (ctxt->d == 0 || (ctxt->d & NotImpl))
if (ctxt->d & NotImpl)
return EMULATION_FAILED;
if (!(ctxt->d & EmulateOnUD) && ctxt->ud)
@ -4535,12 +4538,6 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
ctxt->mem_read.pos = 0;
if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
(ctxt->d & Undefined)) {
rc = emulate_ud(ctxt);
goto done;
}
/* LOCK prefix is allowed only with some instructions */
if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) {
rc = emulate_ud(ctxt);
@ -4552,6 +4549,12 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
goto done;
}
if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
(ctxt->d & Undefined)) {
rc = emulate_ud(ctxt);
goto done;
}
if (((ctxt->d & (Sse|Mmx)) && ((ops->get_cr(ctxt, 0) & X86_CR0_EM)))
|| ((ctxt->d & Sse) && !(ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))) {
rc = emulate_ud(ctxt);