Re: [Xen-devel] xen-evtchn: Bind dyn evtchn:qemu-dm interrupt to next online CPU

[Anoob Soman <anoob.soman@xxxxxxxxxx>]

On 30/05/17 18:42, Boris Ostrovsky wrote:
> This is not worth API change so I guess we are going to have to use
> separate calls, as you originally proposed.
Sure. I will stick to making two hypercalls.

> > Do we need to look at IRQ affinity mask, if we are going to bind
> > eventchannel to smp_processor_id(). If we definitely need to use IRQ
> > affinity then binding to smp_processor_id() might not be the correct
> > approach.
> What if, for whatever reason, the current processor is not in the
> affinity mask of the IRQ?
Yes, there is a possibility of that happening, but chances are really 
slim. I will drop the idea of binding evtchn to smp_processor_id and 
instead change the logic to use a per_cpu(int) to hold last used cpu and 
then use cpu_next_and(last_cpu, affinity, cpu_online_mask) to get next cpu.
-Anoob



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