int kvm_timer_hyp_init()

in kvm/arch_timer.c [1105:1180]

• 61 lines of code
• 11 McCabe index (conditional complexity)

int kvm_timer_hyp_init(bool has_gic)
{
	struct arch_timer_kvm_info *info;
	int err;

	info = arch_timer_get_kvm_info();
	timecounter = &info->timecounter;

	if (!timecounter->cc) {
		kvm_err("kvm_arch_timer: uninitialized timecounter\n");
		return -ENODEV;
	}

	err = kvm_irq_init(info);
	if (err)
		return err;

	/* First, do the virtual EL1 timer irq */

	err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler,
				 "kvm guest vtimer", kvm_get_running_vcpus());
	if (err) {
		kvm_err("kvm_arch_timer: can't request vtimer interrupt %d (%d)\n",
			host_vtimer_irq, err);
		return err;
	}

	if (has_gic) {
		err = irq_set_vcpu_affinity(host_vtimer_irq,
					    kvm_get_running_vcpus());
		if (err) {
			kvm_err("kvm_arch_timer: error setting vcpu affinity\n");
			goto out_free_irq;
		}

		static_branch_enable(&has_gic_active_state);
	}

	kvm_debug("virtual timer IRQ%d\n", host_vtimer_irq);

	/* Now let's do the physical EL1 timer irq */

	if (info->physical_irq > 0) {
		err = request_percpu_irq(host_ptimer_irq, kvm_arch_timer_handler,
					 "kvm guest ptimer", kvm_get_running_vcpus());
		if (err) {
			kvm_err("kvm_arch_timer: can't request ptimer interrupt %d (%d)\n",
				host_ptimer_irq, err);
			return err;
		}

		if (has_gic) {
			err = irq_set_vcpu_affinity(host_ptimer_irq,
						    kvm_get_running_vcpus());
			if (err) {
				kvm_err("kvm_arch_timer: error setting vcpu affinity\n");
				goto out_free_irq;
			}
		}

		kvm_debug("physical timer IRQ%d\n", host_ptimer_irq);
	} else if (has_vhe()) {
		kvm_err("kvm_arch_timer: invalid physical timer IRQ: %d\n",
			info->physical_irq);
		err = -ENODEV;
		goto out_free_irq;
	}

	cpuhp_setup_state(CPUHP_AP_KVM_ARM_TIMER_STARTING,
			  "kvm/arm/timer:starting", kvm_timer_starting_cpu,
			  kvm_timer_dying_cpu);
	return 0;
out_free_irq:
	free_percpu_irq(host_vtimer_irq, kvm_get_running_vcpus());
	return err;
}