static void vgic_mmio_write_v3_misc()

in kvm/vgic/vgic-mmio-v3.c [104:151]

• 35 lines of code
• 14 McCabe index (conditional complexity)

static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu,
				    gpa_t addr, unsigned int len,
				    unsigned long val)
{
	struct vgic_dist *dist = &vcpu->kvm->arch.vgic;

	switch (addr & 0x0c) {
	case GICD_CTLR: {
		bool was_enabled, is_hwsgi;

		mutex_lock(&vcpu->kvm->lock);

		was_enabled = dist->enabled;
		is_hwsgi = dist->nassgireq;

		dist->enabled = val & GICD_CTLR_ENABLE_SS_G1;

		/* Not a GICv4.1? No HW SGIs */
		if (!kvm_vgic_global_state.has_gicv4_1 || !gic_cpuif_has_vsgi())
			val &= ~GICD_CTLR_nASSGIreq;

		/* Dist stays enabled? nASSGIreq is RO */
		if (was_enabled && dist->enabled) {
			val &= ~GICD_CTLR_nASSGIreq;
			val |= FIELD_PREP(GICD_CTLR_nASSGIreq, is_hwsgi);
		}

		/* Switching HW SGIs? */
		dist->nassgireq = val & GICD_CTLR_nASSGIreq;
		if (is_hwsgi != dist->nassgireq)
			vgic_v4_configure_vsgis(vcpu->kvm);

		if (kvm_vgic_global_state.has_gicv4_1 &&
		    was_enabled != dist->enabled)
			kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_RELOAD_GICv4);
		else if (!was_enabled && dist->enabled)
			vgic_kick_vcpus(vcpu->kvm);

		mutex_unlock(&vcpu->kvm->lock);
		break;
	}
	case GICD_TYPER:
	case GICD_TYPER2:
	case GICD_IIDR:
		/* This is at best for documentation purposes... */
		return;
	}
}