IRQFD support with GICv3 ITS (WAS: RE: [PATCH 00/13] arm64: KVM: GICv3 ITS emulation)

[Pavel Fedin]

 Hello!

> KVM GSI routing, even if only used for MSI routing then mandates to
> build entries for non MSI IRQs, using irqchip routing entries. Then you
> draw the irqchip.c kvm_irq_routing_table
> chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS] static allocation issue.

 Sorry for this add-on, needed time to look at the code.
 Actually, if we don't use this code at all, and implement our own kvm_set_irq_routing()
and kvm_free_irq_routing(), we don't have to bother about all these limitations.
 The simplest thing to do there would be to store GSI number in struct its_itte. In this
case raising an MSI by GSI would not differ from what i currently do.

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia