Re: [Xen-devel] [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough

[Simon Horman <horms@xxxxxxxxxxxx>]

On Mon, Feb 23, 2009 at 03:31:30AM -0800, Keir Fraser wrote:
> On 22/02/2009 22:55, "Simon Horman" <horms@xxxxxxxxxxxx> wrote:
> 
> >> The another solution is expanding GSI to 127. I don't sure it is
> >> possible, but sharing virtual GSI will not occur.
> > 
> > That thought crossed my mind too, I will investigate further.
> > But I think that ideally it would need to be expanded to 143
> > as the first 16 GSI are currently reserved for ISA.
> 
> Can't xend or qemu do a search of PCI slot space to pick a virtual
> devfn:intx that doesn't conflict (or that purposely does conflict, if there
> are any cases where you want that)? 32 non-legacy GSIs should be enough to
> avoid any aliasing if a bit of effort is put in to avoid it.

That was what I had in mind in my original proposal.
I'll try coding it up and see what it looks like.

-- 
Simon Horman
  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en


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