RE: [Xen-devel] FW: about VIRQ & PIRQ

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Mark Williamson
>Sent: 2007年6月6日 0:20
>
>If I recall correctly, PIRQs are mapped one-to-one onto the lower
>numbered
>event channels (I'm not sure if this is specific to XenLinux or part of the
>Xen API).
>

Good explanation, except one point. :-) All event channels are allocated 
on demand and there's no one-to-one mapping for even PIRQ. When 
driver tries to start its irq, a new event port is allocated and then bound 
to that PIRQ. There does be a one-to-one mapping style, for PIRQ 
mapped into the IRQ namespace which is shared with DYNIRQ.

Thanks,
Kevin

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