KVM: x86 emulator: simplify two-byte opcode check

Two-byte opcode always start with 0x0F and the decode flags
of opcode 0xF0 is always 0, so remove dup check.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 7 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ddbad15c9486..a9a4a0b78a7d 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2375,13 +2375,11 @@ done_prefixes:
 
         /* Opcode byte(s). */
         opcode = opcode_table[c->b];
-        if (opcode.flags == 0) {
-                /* Two-byte opcode? */
-                if (c->b == 0x0f) {
-                        c->twobyte = 1;
-                        c->b = insn_fetch(u8, 1, c->eip);
-                        opcode = twobyte_table[c->b];
-                }
+        /* Two-byte opcode? */
+        if (c->b == 0x0f) {
+                c->twobyte = 1;
+                c->b = insn_fetch(u8, 1, c->eip);
+                opcode = twobyte_table[c->b];
         }
         c->d = opcode.flags;