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Commit 1bd5f469 authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Avi Kivity
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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
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+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;