Re: [Xen-devel] Re: event delay issue on SMP machine when xen0 is SMP enabled

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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