ioapic: support "info irq"
This include both userspace and in-kernel ioapic. Note that the numbers can be inaccurate for kvm-ioapic. One reason is the same with kvm-i8259, that when irqfd is used, irqs can be delivered all inside kernel without our notice. Meanwhile, kvm-ioapic is specially treated when irq numbers <ISA_NUM_IRQS, those irqs will be delivered in kernel too via kvm-i8259 (please refer to kvm_pc_gsi_handler). Signed-off-by: NPeter Xu <peterx@redhat.com> Message-Id: <20171229073104.3810-5-peterx@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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