int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
	enum lapic_mode old_mode = kvm_get_apic_mode(vcpu);
	enum lapic_mode new_mode = kvm_apic_mode(msr_info->data);
	u64 reserved_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu) | 0x2ff |
		(guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE);

	if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID)
		return 1;
	if (!msr_info->host_initiated) {
		if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC)
			return 1;
		if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC)
			return 1;
	}

	kvm_lapic_set_base(vcpu, msr_info->data);
	kvm_recalculate_apic_map(vcpu->kvm);
	return 0;
}
int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
	enum lapic_mode old_mode = kvm_get_apic_mode(vcpu);
	enum lapic_mode new_mode = kvm_apic_mode(msr_info->data);
	u64 reserved_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu) | 0x2ff |
		(guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE);

	if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID)
		return 1;
	if (!msr_info->host_initiated) {
		if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC)
			return 1;
		if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC)
			return 1;
	}

	kvm_lapic_set_base(vcpu, msr_info->data);
	kvm_recalculate_apic_map(vcpu->kvm);
	return 0;
}