Re: [Xen-devel] [RFC 09/14] xen/xsm: flask: MSI is PCI specific

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-03-13 at 14:40 +0000, Julien Grall wrote:
> Hello Daniel,
> 
> Thanks for your review.
> 
> On 03/13/2014 02:34 PM, Daniel De Graaf wrote:
> > On 03/12/2014 12:16 PM, Julien Grall wrote:
> >> MSI is not yet support on ARM and will break the compilation when
> >> XSM_ENABLE=y.
> >>
> >> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> >> Cc: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> > 
> > I am assuming that IRQs on ARM are generally allocated in a static
> > manner for
> > a given board, so that a security policy based on their numeric values
> > would
> > be effective. If IRQs above nr_static_irqs are dynamic as on x86, it may be
> > necessary to resolve them in some way. Since this resolution would
> > naturally
> > be split into a separate patch, in either case this patch is
> 
> Right, nr_static_irqs is set to 1024 on ARM. For now every IRQs, are not
> higher than this number.

This will change before long though. Would HAVE_MSI_IRQS be a better
name for this particular arch-configurable? After all PCI without MSI is
plausible isn't it? (well, maybe not in the modern world)

Ian


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