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