KVM: x86 emulator: implement IMUL REG, R/M (opcode 0F AF)

Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/emulate.c

@@ -2264,15 +2264,22 @@ static int em_ret_near_imm(struct x86_emulate_ctxt *ctxt)
 	return X86EMUL_CONTINUE;
 }
 
-static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
+static int em_imul(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
 
-	c->dst.val = c->src2.val;
 	emulate_2op_SrcV_nobyte("imul", c->src, c->dst, ctxt->eflags);
 	return X86EMUL_CONTINUE;
 }
 
+static int em_imul_3op(struct x86_emulate_ctxt *ctxt)
+{
+	struct decode_cache *c = &ctxt->decode;
+
+	c->dst.val = c->src2.val;
+	return em_imul(ctxt);
+}
+
 #define D(_y) { .flags = (_y) }
 #define N    D(0)
 #define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@@ -2488,7 +2495,7 @@ static struct opcode twobyte_table[256] = {
 	N, D(DstMem | SrcReg | ModRM | BitOp | Lock),
 	D(DstMem | SrcReg | Src2ImmByte | ModRM),
 	D(DstMem | SrcReg | Src2CL | ModRM),
-	D(ModRM), N,
+	D(ModRM), I(DstReg | SrcMem | ModRM, em_imul),
 	/* 0xB0 - 0xB7 */
 	D(ByteOp | DstMem | SrcReg | ModRM | Lock), D(DstMem | SrcReg | ModRM | Lock),
 	N, D(DstMem | SrcReg | ModRM | BitOp | Lock),