Re: [Xen-devel] [XenARM] XEN tools for ARM with Virtualization Extensions

["Eric Trudeau" <etrudeau@xxxxxxxxxxxx>]

> > What functions should I call to implement  XEN_DOMCTL_bind_pt_irq on
> ARM?
> 
> There's a function like route_irq_to_guest which we use to route IRQs to
> dom0 during boot. In principal that could also be used to reroute an IRQ
> to a guest, but I'm not sure how it will interact with the reassignment,
> since in your case the IRQ starts off bound to dom0. Hopefully it's just
> a small change to make it work for this case.
> 

In gic_route_irq_to_guest(), there is this call:
    gic_set_irq_properties(irq->irq, level, 1u << smp_processor_id(), 0xa0);

I believe this will mean all IRQs will be routed on the current processor.
I believe this is PCPU0 when the dom0 device tree is being parsed.
When the PHYSDEVOP_map_pirq call is handled by the Hypervisor, the PCPU
may be any of the processors.
Is there a reason when we only route the IRQs for Dom0 to one PCPU?
If only one is allowed, should it be PCPU0?

Thanks,
Eric
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