[3/3] KVM: x86 emulator: mask group 8 instruction as BitOp

Commit Message

Wei Yongjun Aug. 6, 2010, 7:21 a.m. UTC

None

Patch

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index e7e3d2d..dc6a74e 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -746,6 +746,9 @@  static void fetch_bit_operand(struct decode_cache *c)
 			c->dst.addr.mem += (c->src.val & mask) / 8;
 		}
 	}
+
+	/* only subword offset */
+	c->src.val &= (c->dst.bytes << 3) - 1;
 }
 
 static int read_emulated(struct x86_emulate_ctxt *ctxt,
@@ -2346,7 +2349,7 @@  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 */
@@ -3420,8 +3423,6 @@  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 */
@@ -3449,8 +3450,6 @@  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 */
@@ -3472,8 +3471,6 @@  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 */