KVM: x86 emulator: mask group 8 instruction as BitOp

Mask group 8 instruction as BitOp, so we can share the
code for adjust the source operand.

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

1 files changed, 4 insertions, 7 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 9b81cde8ffa2..a9b2b9e6a3f0 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -737,6 +737,9 @@ static void fetch_bit_operand(struct decode_cache *c)
 
                 c->dst.addr.mem += (sv >> 3);
         }
+
+        /* only subword offset */
+        c->src.val &= (c->dst.bytes << 3) - 1;
 }
 
 static int read_emulated(struct x86_emulate_ctxt *ctxt,
@@ -2336,7 +2339,7 @@ static struct opcode twobyte_table[256] = {
             D(DstReg | SrcMem16 | ModRM | Mov),
         /* 0xB8 - 0xBF */
         N, N,
-        G(0, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock),
+        G(BitOp, group8), D(DstMem | SrcReg | ModRM | BitOp | Lock),
         N, N, D(ByteOp | DstReg | SrcMem | ModRM | Mov),
             D(DstReg | SrcMem16 | ModRM | Mov),
         /* 0xC0 - 0xCF */
@@ -3419,8 +3422,6 @@ twobyte_insn:
                 break;
         case 0xab:
               bts:              /* bts */
-                /* only subword offset */
-                c->src.val &= (c->dst.bytes << 3) - 1;
                 emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
                 break;
         case 0xac: /* shrd imm8, r, r/m */
@@ -3448,8 +3449,6 @@ twobyte_insn:
                 break;
         case 0xb3:
               btr:              /* btr */
-                /* only subword offset */
-                c->src.val &= (c->dst.bytes << 3) - 1;
                 emulate_2op_SrcV_nobyte("btr", c->src, c->dst, ctxt->eflags);
                 break;
         case 0xb6 ... 0xb7:     /* movzx */
@@ -3471,8 +3470,6 @@ twobyte_insn:
                 break;
         case 0xbb:
               btc:              /* btc */
-                /* only subword offset */
-                c->src.val &= (c->dst.bytes << 3) - 1;
                 emulate_2op_SrcV_nobyte("btc", c->src, c->dst, ctxt->eflags);
                 break;
         case 0xbe ... 0xbf:     /* movsx */