[Xen-devel] problem in setting cpumask for physical interrupt

["Agarwal, Lomesh" <lomesh.agarwal@xxxxxxxxx>]

Why does function pirq_guest_bind (in arch/x86/irq.c) calls set_affinity with cpumask of current processor? If I understand correctly pirq_guest_bind is called in response to guest calling request_irq. So, if by chance all guests call request_irq on the same physical processor then Xen may end up setting interrupt affinity to one physical processor only.

I think Xen should set the affinity to all the processors available. VCPU is not guranteed to run on the same physical processor on which it called request_irq anyway.

I will send a patch if my understanding looks ok.

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