int __must_check kvm_s390_deliver_pending_interrupts()

in kvm/interrupt.c [1390:1472]

• 74 lines of code
• 27 McCabe index (conditional complexity)

int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	int rc = 0;
	unsigned long irq_type;
	unsigned long irqs;

	__reset_intercept_indicators(vcpu);

	/* pending ckc conditions might have been invalidated */
	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
	if (ckc_irq_pending(vcpu))
		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);

	/* pending cpu timer conditions might have been invalidated */
	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
	if (cpu_timer_irq_pending(vcpu))
		set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);

	while ((irqs = deliverable_irqs(vcpu)) && !rc) {
		/* bits are in the reverse order of interrupt priority */
		irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
		switch (irq_type) {
		case IRQ_PEND_IO_ISC_0:
		case IRQ_PEND_IO_ISC_1:
		case IRQ_PEND_IO_ISC_2:
		case IRQ_PEND_IO_ISC_3:
		case IRQ_PEND_IO_ISC_4:
		case IRQ_PEND_IO_ISC_5:
		case IRQ_PEND_IO_ISC_6:
		case IRQ_PEND_IO_ISC_7:
			rc = __deliver_io(vcpu, irq_type);
			break;
		case IRQ_PEND_MCHK_EX:
		case IRQ_PEND_MCHK_REP:
			rc = __deliver_machine_check(vcpu);
			break;
		case IRQ_PEND_PROG:
			rc = __deliver_prog(vcpu);
			break;
		case IRQ_PEND_EXT_EMERGENCY:
			rc = __deliver_emergency_signal(vcpu);
			break;
		case IRQ_PEND_EXT_EXTERNAL:
			rc = __deliver_external_call(vcpu);
			break;
		case IRQ_PEND_EXT_CLOCK_COMP:
			rc = __deliver_ckc(vcpu);
			break;
		case IRQ_PEND_EXT_CPU_TIMER:
			rc = __deliver_cpu_timer(vcpu);
			break;
		case IRQ_PEND_RESTART:
			rc = __deliver_restart(vcpu);
			break;
		case IRQ_PEND_SET_PREFIX:
			rc = __deliver_set_prefix(vcpu);
			break;
		case IRQ_PEND_PFAULT_INIT:
			rc = __deliver_pfault_init(vcpu);
			break;
		case IRQ_PEND_EXT_SERVICE:
			rc = __deliver_service(vcpu);
			break;
		case IRQ_PEND_EXT_SERVICE_EV:
			rc = __deliver_service_ev(vcpu);
			break;
		case IRQ_PEND_PFAULT_DONE:
			rc = __deliver_pfault_done(vcpu);
			break;
		case IRQ_PEND_VIRTIO:
			rc = __deliver_virtio(vcpu);
			break;
		default:
			WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
			clear_bit(irq_type, &li->pending_irqs);
		}
	}

	set_intercept_indicators(vcpu);

	return rc;
}