KVM: x86 emulator: expand decode flags to 64 bits

Unifiying the operands means not taking advantage of the fact that some
operand types can only go into certain operands (for example, DI can only
be used by the destination), so we need more bits to hold the operand type.
Signed-off-by: NAvi Kivity <avi@redhat.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

arch/x86/include/asm/kvm_emulate.h

@@ -262,7 +262,7 @@ struct x86_emulate_ctxt {
 	struct operand dst;
 	bool has_seg_override;
 	u8 seg_override;
-	unsigned int d;
+	u64 d;
 	int (*execute)(struct x86_emulate_ctxt *ctxt);
 	int (*check_perm)(struct x86_emulate_ctxt *ctxt);
 	/* modrm */

arch/x86/kvm/emulate.c

@@ -31,18 +31,18 @@
 /*
  * Operand types
  */
-#define OpNone             0
-#define OpImplicit         1  /* No generic decode */
-#define OpReg              2  /* Register */
-#define OpMem              3  /* Memory */
-#define OpAcc              4  /* Accumulator: AL/AX/EAX/RAX */
-#define OpDI               5  /* ES:DI/EDI/RDI */
-#define OpMem64            6  /* Memory, 64-bit */
-#define OpImmUByte         7  /* Zero-extended 8-bit immediate */
-#define OpDX               8  /* DX register */
+#define OpNone             0ull
+#define OpImplicit         1ull  /* No generic decode */
+#define OpReg              2ull  /* Register */
+#define OpMem              3ull  /* Memory */
+#define OpAcc              4ull  /* Accumulator: AL/AX/EAX/RAX */
+#define OpDI               5ull  /* ES:DI/EDI/RDI */
+#define OpMem64            6ull  /* Memory, 64-bit */
+#define OpImmUByte         7ull  /* Zero-extended 8-bit immediate */
+#define OpDX               8ull  /* DX register */
 
 #define OpBits             4  /* Width of operand field */
-#define OpMask             ((1 << OpBits) - 1)
+#define OpMask             ((1ull << OpBits) - 1)
 
 /*
  * Opcode effective-address decode tables.
@@ -108,12 +108,12 @@
 #define Priv        (1<<27) /* instruction generates #GP if current CPL != 0 */
 #define No64	    (1<<28)
 /* Source 2 operand type */
-#define Src2None    (0<<29)
-#define Src2CL      (1<<29)
-#define Src2ImmByte (2<<29)
-#define Src2One     (3<<29)
-#define Src2Imm     (4<<29)
-#define Src2Mask    (7<<29)
+#define Src2None    (0u<<29)
+#define Src2CL      (1u<<29)
+#define Src2ImmByte (2u<<29)
+#define Src2One     (3u<<29)
+#define Src2Imm     (4u<<29)
+#define Src2Mask    (7u<<29)
 
 #define X2(x...) x, x
 #define X3(x...) X2(x), x
@@ -125,8 +125,8 @@
 #define X16(x...) X8(x), X8(x)
 
 struct opcode {
-	u32 flags;
-	u8 intercept;
+	u64 flags : 56;
+	u64 intercept : 8;
 	union {
 		int (*execute)(struct x86_emulate_ctxt *ctxt);
 		struct opcode *group;
@@ -3530,7 +3530,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
 			return EMULATION_FAILED;
 		}
 
-		ctxt->d &= ~GroupMask;
+		ctxt->d &= ~(u64)GroupMask;
 		ctxt->d |= opcode.flags;
 	}