KVM: x86 emulator: Make group storage bits separate from operand bits

Currently group bits are stored in bits 0:7, where operand bits are stored.

Make group bits be 0:3, and move the existing bits 0:3 to 16:19, so we can
mix group and operand bits.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/emulate.c

@@ -46,15 +46,15 @@
  */
 
 /* Operand sizes: 8-bit operands or specified/overridden size. */
-#define ByteOp      (1<<0)	/* 8-bit operands. */
+#define ByteOp      (1<<16)	/* 8-bit operands. */
 /* Destination operand type. */
-#define ImplicitOps (1<<1)	/* Implicit in opcode. No generic decode. */
-#define DstReg      (2<<1)	/* Register operand. */
-#define DstMem      (3<<1)	/* Memory operand. */
-#define DstAcc      (4<<1)      /* Destination Accumulator */
-#define DstDI       (5<<1)	/* Destination is in ES:(E)DI */
-#define DstMem64    (6<<1)	/* 64bit memory operand */
-#define DstMask     (7<<1)
+#define ImplicitOps (1<<17)	/* Implicit in opcode. No generic decode. */
+#define DstReg      (2<<17)	/* Register operand. */
+#define DstMem      (3<<17)	/* Memory operand. */
+#define DstAcc      (4<<17)	/* Destination Accumulator */
+#define DstDI       (5<<17)	/* Destination is in ES:(E)DI */
+#define DstMem64    (6<<17)	/* 64bit memory operand */
+#define DstMask     (7<<17)
 /* Source operand type. */
 #define SrcNone     (0<<4)	/* No source operand. */
 #define SrcImplicit (0<<4)	/* Source operand is implicit in the opcode. */
@@ -82,7 +82,7 @@
 #define Stack       (1<<13)     /* Stack instruction (push/pop) */
 #define Group       (1<<14)     /* Bits 3:5 of modrm byte extend opcode */
 #define GroupDual   (1<<15)     /* Alternate decoding of mod == 3 */
-#define GroupMask   0xff        /* Group number stored in bits 0:7 */
+#define GroupMask   0x0f        /* Group number stored in bits 0:3 */
 /* Misc flags */
 #define Lock        (1<<26) /* lock prefix is allowed for the instruction */
 #define Priv        (1<<27) /* instruction generates #GP if current CPL != 0 */