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>

1 files changed, 31 insertions, 28 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2ebec692d44b..5561680c1e9c 100644
--- 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;