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Commit e1e210b0 authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Avi Kivity
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KVM: x86 emulator: Use opcode::execute for WRMSR/RDMSR 



WRMSR: 0F 30
RDMSR: 0F 32

Signed-off-by: default avatarTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent bc00f8d2

arch/x86/kvm/emulate.c

+26 −26
Original line number Diff line number Diff line
@@ -2666,6 +2666,30 @@ static int em_dr_write(struct x86_emulate_ctxt *ctxt) 
	return X86EMUL_CONTINUE;

}



static int em_wrmsr(struct x86_emulate_ctxt *ctxt)

{

	u64 msr_data;



	msr_data = (u32)ctxt->regs[VCPU_REGS_RAX]

		| ((u64)ctxt->regs[VCPU_REGS_RDX] << 32);

	if (ctxt->ops->set_msr(ctxt, ctxt->regs[VCPU_REGS_RCX], msr_data))

		return emulate_gp(ctxt, 0);



	return X86EMUL_CONTINUE;

}



static int em_rdmsr(struct x86_emulate_ctxt *ctxt)

{

	u64 msr_data;



	if (ctxt->ops->get_msr(ctxt, ctxt->regs[VCPU_REGS_RCX], &msr_data))

		return emulate_gp(ctxt, 0);



	ctxt->regs[VCPU_REGS_RAX] = (u32)msr_data;

	ctxt->regs[VCPU_REGS_RDX] = msr_data >> 32;

	return X86EMUL_CONTINUE;

}



static int em_mov_rm_sreg(struct x86_emulate_ctxt *ctxt)

{

	if (ctxt->modrm_reg > VCPU_SREG_GS)
@@ -3337,9 +3361,9 @@ static struct opcode twobyte_table[256] = { 
	N, N, N, N,

	N, N, N, N, N, N, N, N,

	/* 0x30 - 0x3F */

	DI(ImplicitOps | Priv, wrmsr),

	II(ImplicitOps | Priv, em_wrmsr, wrmsr),

	IIP(ImplicitOps, em_rdtsc, rdtsc, check_rdtsc),

	DI(ImplicitOps | Priv, rdmsr),

	II(ImplicitOps | Priv, em_rdmsr, rdmsr),

	DIP(ImplicitOps | Priv, rdpmc, check_rdpmc),

	I(ImplicitOps | VendorSpecific, em_sysenter),

	I(ImplicitOps | Priv | VendorSpecific, em_sysexit),
@@ -3818,7 +3842,6 @@ static bool string_insn_completed(struct x86_emulate_ctxt *ctxt) 
int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)

{

	struct x86_emulate_ops *ops = ctxt->ops;

	u64 msr_data;

	int rc = X86EMUL_CONTINUE;

	int saved_dst_type = ctxt->dst.type;
@@ -4108,29 +4131,6 @@ twobyte_insn: 
	case 0x21: /* mov from dr to reg */

		ops->get_dr(ctxt, ctxt->modrm_reg, &ctxt->dst.val);

		break;

	case 0x30:

		/* wrmsr */

		msr_data = (u32)ctxt->regs[VCPU_REGS_RAX]

			| ((u64)ctxt->regs[VCPU_REGS_RDX] << 32);

		if (ops->set_msr(ctxt, ctxt->regs[VCPU_REGS_RCX], msr_data)) {

			emulate_gp(ctxt, 0);

			rc = X86EMUL_PROPAGATE_FAULT;

			goto done;

		}

		rc = X86EMUL_CONTINUE;

		break;

	case 0x32:

		/* rdmsr */

		if (ops->get_msr(ctxt, ctxt->regs[VCPU_REGS_RCX], &msr_data)) {

			emulate_gp(ctxt, 0);

			rc = X86EMUL_PROPAGATE_FAULT;

			goto done;

		} else {

			ctxt->regs[VCPU_REGS_RAX] = (u32)msr_data;

			ctxt->regs[VCPU_REGS_RDX] = msr_data >> 32;

		}

		rc = X86EMUL_CONTINUE;

		break;

	case 0x40 ... 0x4f:	/* cmov */

		ctxt->dst.val = ctxt->dst.orig_val = ctxt->src.val;

		if (!test_cc(ctxt->b, ctxt->eflags))