Re: [Xen-devel] How to query the number of vcpus?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 30 Apr 2005, at 19:03, Ian Pratt wrote:

> > cpumap_t is a reasonable name as at least it won't conflict
> > with type names internal to Xen.
> >
> > However, why pass a pointer to a cpumap_t into PINCPU? And
> > should we cater now for systems with too many cpus to be
> > represented by a long?
> I think so -- might as well get the interface right. I was thinking
> something like the fd mask that get's passed to select, where you
> sepcify the highest set bit.
In some cases Xen returns a cpumap to the guest (in getdomaininfo). In 
that case the fd mask trick won't really work as the guest needs to 
know in advance the biggetst map that Xen may return. Anyway, a map of 
256 bits is going to give us a fair amount of headroom I think.
 -- Keir


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