Re: [Xen-devel] [PATCH 2 of 4] xen: introduce PHYSDEVOP_get_nr_pirqs

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 31 Aug 2010, Keir Fraser wrote:
> On 31/08/2010 13:46, "Stefano Stabellini" <Stefano.Stabellini@xxxxxxxxxxxxx>
> wrote:
> 
> >>> That wouldn't be a good idea considering that the current
> >>> PHYSDEVOP_map_pirq interface allows the guest to choose the pirq
> >>> number
> >> 
> >> So what significance does nr_pirqs have to the guest?
> >  
> > the upper limit of the pirq number it might choose
> 
> Couldn't it, like, pick the smallest available? :-)
> 

Well, it might still be useful to know the upper limit, besides linux
tends to choose the pirq == irq and the irqs for MSIs are high.
Xen does the same thing by the way.


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