void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u32 sec_exec_control;

	if (!lapic_in_kernel(vcpu))
		return;

	if (!flexpriority_enabled &&
	    !cpu_has_vmx_virtualize_x2apic_mode())
		return;

	/* Postpone execution until vmcs01 is the current VMCS. */
	if (is_guest_mode(vcpu)) {
		vmx->nested.change_vmcs01_virtual_apic_mode = true;
		return;
	}

	sec_exec_control = secondary_exec_controls_get(vmx);
	sec_exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
			      SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE);

	switch (kvm_get_apic_mode(vcpu)) {
	case LAPIC_MODE_INVALID:
		WARN_ONCE(true, "Invalid local APIC state");
	case LAPIC_MODE_DISABLED:
		break;
	case LAPIC_MODE_XAPIC:
		if (flexpriority_enabled) {
			sec_exec_control |=
				SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
			kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu);

			/*
			 * Flush the TLB, reloading the APIC access page will
			 * only do so if its physical address has changed, but
			 * the guest may have inserted a non-APIC mapping into
			 * the TLB while the APIC access page was disabled.
			 */
			kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
		}
		break;
	case LAPIC_MODE_X2APIC:
		if (cpu_has_vmx_virtualize_x2apic_mode())
			sec_exec_control |=
				SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
		break;
	}
	secondary_exec_controls_set(vmx, sec_exec_control);

	vmx_update_msr_bitmap(vcpu);
}
Unknown