KVM: x86 emulator: Use opcode::execute for MOV(8C/8E)

Different functions for those which take segment register operands.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2ebec69..5561680 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2683,6 +2683,33 @@ static int em_mov(struct x86_emulate_ctxt *ctxt)
        return X86EMUL_CONTINUE;
 }
 
+static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+
+       if (c->modrm_reg > VCPU_SREG_GS)
+               return emulate_ud(ctxt);
+
+       c->dst.val = get_segment_selector(ctxt, c->modrm_reg);
+       return X86EMUL_CONTINUE;
+}
+
+static int em_mov_sreg_rm(struct x86_emulate_ctxt *ctxt)
+{
+       struct decode_cache *c = &ctxt->decode;
+       u16 sel = c->src.val;
+
+       if (c->modrm_reg == VCPU_SREG_CS || c->modrm_reg > VCPU_SREG_GS)
+               return emulate_ud(ctxt);
+
+       if (c->modrm_reg == VCPU_SREG_SS)
+               ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
+
+       /* Disable writeback. */
+       c->dst.type = OP_NONE;
+       return load_segment_descriptor(ctxt, sel, c->modrm_reg);
+}
+
 static int em_movdqu(struct x86_emulate_ctxt *ctxt)
 {
        struct decode_cache *c = &ctxt->decode;
@@ -3172,8 +3199,10 @@ static struct opcode opcode_table[256] = {
        /* 0x88 - 0x8F */
        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),
+       I(DstMem | SrcNone | ModRM | Mov, em_mov_rm_sreg),
+       D(ModRM | SrcMem | NoAccess | DstReg),
+       I(ImplicitOps | SrcMem16 | ModRM, em_mov_sreg_rm),
+       G(0, group1A),
        /* 0x90 - 0x97 */
        DI(SrcAcc | DstReg, pause), X7(D(SrcAcc | DstReg)),
        /* 0x98 - 0x9F */
@@ -3906,35 +3935,9 @@ special_insn:
                if (test_cc(c->b, ctxt->eflags))
                        jmp_rel(c, c->src.val);
                break;
-       case 0x8c:  /* mov r/m, sreg */
-               if (c->modrm_reg > VCPU_SREG_GS) {
-                       rc = emulate_ud(ctxt);
-                       goto done;
-               }
-               c->dst.val = get_segment_selector(ctxt, c->modrm_reg);
-               break;
        case 0x8d: /* lea r16/r32, m */
                c->dst.val = c->src.addr.mem.ea;
                break;
-       case 0x8e: { /* mov seg, r/m16 */
-               uint16_t sel;
-
-               sel = c->src.val;
-
-               if (c->modrm_reg == VCPU_SREG_CS ||
-                   c->modrm_reg > VCPU_SREG_GS) {
-                       rc = emulate_ud(ctxt);
-                       goto done;
-               }
-
-               if (c->modrm_reg == VCPU_SREG_SS)
-                       ctxt->interruptibility = KVM_X86_SHADOW_INT_MOV_SS;
-
-               rc = load_segment_descriptor(ctxt, sel, c->modrm_reg);
-
-               c->dst.type = OP_NONE;  /* Disable writeback. */
-               break;
-       }
        case 0x8f:              /* pop (sole member of Grp1a) */
                rc = em_grp1a(ctxt);
                break;