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>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 15453e5..d79677c 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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)
@@ -4535,19 +4538,19 @@ 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)) {
+       /* LOCK prefix is allowed only with some instructions */
+       if (ctxt->lock_prefix && (!(ctxt->d & Lock) || ctxt->dst.type != OP_MEM)) {
                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)) {
+       if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) {
                rc = emulate_ud(ctxt);
                goto done;
        }
 
-       if ((ctxt->d & SrcMask) == SrcMemFAddr && ctxt->src.type != OP_MEM) {
+       if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
+                       (ctxt->d & Undefined)) {
                rc = emulate_ud(ctxt);
                goto done;
        }