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Commit 1bd5f469 authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Avi Kivity
Browse files

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



Different functions for those which take segment register operands.

Signed-off-by: default avatarTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent ebda02c2

arch/x86/kvm/emulate.c

+31 −28
Original line number Diff line number Diff line
@@ -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 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) 
		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;