KVM: x86 emulator: use single stage decoding for mov instructions

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

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8bfa3e3..c0715ae 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2378,6 +2378,13 @@ static int em_rdtsc(struct x86_emulate_ctxt *ctxt)
        return X86EMUL_CONTINUE;
 }
 
+static int em_mov(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       c->dst.val = c->src.val;
+       return X86EMUL_CONTINUE;
+}
+
 #define D(_y) { .flags = (_y) }
 #define N    D(0)
 #define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@@ -2489,8 +2496,8 @@ static struct opcode opcode_table[256] = {
        G(DstMem | SrcImmByte | ModRM | Group, group1),
        D2bv(DstMem | SrcReg | ModRM), D2bv(DstMem | SrcReg | ModRM | Lock),
        /* 0x88 - 0x8F */
-       D2bv(DstMem | SrcReg | ModRM | Mov),
-       D2bv(DstReg | SrcMem | ModRM | Mov),
+       I2bv(DstMem | SrcReg | ModRM | Mov, em_mov),
+       I2bv(DstReg | SrcMem | ModRM | Mov, em_mov),
        D(DstMem | SrcNone | ModRM | Mov), D(ModRM | SrcMem | NoAccess | DstReg),
        D(ImplicitOps | SrcMem16 | ModRM), G(0, group1A),
        /* 0x90 - 0x97 */
@@ -2500,24 +2507,25 @@ static struct opcode opcode_table[256] = {
        I(SrcImmFAddr | No64, em_call_far), N,
        D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
        /* 0xA0 - 0xA7 */
-       D2bv(DstAcc | SrcMem | Mov | MemAbs),
-       D2bv(DstMem | SrcAcc | Mov | MemAbs),
-       D2bv(SrcSI | DstDI | Mov | String), D2bv(SrcSI | DstDI | String),
+       I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
+       I2bv(DstMem | SrcAcc | Mov | MemAbs, em_mov),
+       I2bv(SrcSI | DstDI | Mov | String, em_mov),
+       D2bv(SrcSI | DstDI | String),
        /* 0xA8 - 0xAF */
        D2bv(DstAcc | SrcImm),
-       D2bv(SrcAcc | DstDI | Mov | String),
-       D2bv(SrcSI | DstAcc | Mov | String),
+       I2bv(SrcAcc | DstDI | Mov | String, em_mov),
+       I2bv(SrcSI | DstAcc | Mov | String, em_mov),
        D2bv(SrcAcc | DstDI | String),
        /* 0xB0 - 0xB7 */
-       X8(D(ByteOp | DstReg | SrcImm | Mov)),
+       X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),
        /* 0xB8 - 0xBF */
-       X8(D(DstReg | SrcImm | Mov)),
+       X8(I(DstReg | SrcImm | Mov, em_mov)),
        /* 0xC0 - 0xC7 */
        D2bv(DstMem | SrcImmByte | ModRM),
        I(ImplicitOps | Stack | SrcImmU16, em_ret_near_imm),
        D(ImplicitOps | Stack),
        D(DstReg | SrcMemFAddr | ModRM | No64), D(DstReg | SrcMemFAddr | ModRM | No64),
-       D2bv(DstMem | SrcImm | ModRM | Mov),
+       I2bv(DstMem | SrcImm | ModRM | Mov, em_mov),
        /* 0xC8 - 0xCF */
        N, N, N, D(ImplicitOps | Stack),
        D(ImplicitOps), D(SrcImmByte), D(ImplicitOps | No64), D(ImplicitOps),
@@ -3212,8 +3220,6 @@ special_insn:
                c->dst.val = c->src.orig_val;
                c->lock_prefix = 1;
                break;
-       case 0x88 ... 0x8b:     /* mov */
-               goto mov;
        case 0x8c:  /* mov r/m, sreg */
                if (c->modrm_reg > VCPU_SREG_GS) {
                        emulate_ud(ctxt);
@@ -3271,22 +3277,14 @@ special_insn:
                if (rc != X86EMUL_CONTINUE)
                        goto done;
                break;
-       case 0xa0 ... 0xa3:     /* mov */
-       case 0xa4 ... 0xa5:     /* movs */
-               goto mov;
        case 0xa6 ... 0xa7:     /* cmps */
                c->dst.type = OP_NONE; /* Disable writeback. */
                DPRINTF("cmps: mem1=0x%p mem2=0x%p\n", c->src.addr.mem, c->dst.addr.mem);
                goto cmp;
        case 0xa8 ... 0xa9:     /* test ax, imm */
                goto test;
-       case 0xaa ... 0xab:     /* stos */
-       case 0xac ... 0xad:     /* lods */
-               goto mov;
        case 0xae ... 0xaf:     /* scas */
                goto cmp;
-       case 0xb0 ... 0xbf: /* mov r, imm */
-               goto mov;
        case 0xc0 ... 0xc1:
                emulate_grp2(ctxt);
                break;
@@ -3305,10 +3303,6 @@ special_insn:
                if (rc != X86EMUL_CONTINUE)
                        goto done;
                break;
-       case 0xc6 ... 0xc7:     /* mov (sole member of Grp11) */
-       mov:
-               c->dst.val = c->src.val;
-               break;
        case 0xcb:              /* ret far */
                rc = emulate_ret_far(ctxt, ops);
                if (rc != X86EMUL_CONTINUE)