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xen-devel
Re: [Xen-devel] Re: event delay issue on SMP machine when xen0 is SMP en
On 9 Dec 2005, at 08:28, Keir Fraser wrote:
BTW, why vcpu other than vcpu0 won't handle event by default?
We could allow any vcpu to process any pending notifications. It would
mean vcpus outside an irq's affinity set could end up processing an
interrupt and I'm not sure if that's a good thing. It would actually
slightly simplify evtchn.c though (no need to apply a per-cpu mask to
the event-channel port array).
You always remember a good reason not to do something after sending the
email. :-)
IPIs and VIRQs must be processed by their home vcpu. Hence we do need
to limit evtchn processing to the current bound vcpu, and that leads
(currently) to the problem you see.
So I think the right fix is just to fix unmask_evtchn(). Maybe you guys
want to send a patch to move it into evtchn.c and fix it to send to
cpu_from_evtchn(evtchn)?
-- Keir
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