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Re: [Xen-devel] [PATCH v2] xen/arm: implement GICD_I[S/C]ACTIVER reads

On Sat, 28 Mar 2020, Julien Grall wrote:
> qHi Stefano,
> On 27/03/2020 02:34, Stefano Stabellini wrote:
> > This is a simple implementation of GICD_ICACTIVER / GICD_ISACTIVER
> > reads. It doesn't take into account the latest state of interrupts on
> > other vCPUs. Only the current vCPU is up-to-date. A full solution is
> > not possible because it would require synchronization among all vCPUs,
> > which would be very expensive in terms or latency.
> Your sentence suggests you have number showing that correctly emulating the
> registers would be too slow. Mind sharing them?

No, I don't have any numbers. Would you prefer a different wording or a
better explanation? I also realized there is a typo in there (or/of).



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