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Re: [Xen-devel] Domain 0 hardware problem with nForce2 AGP?



> We don't support agpgart at the moment.
> 
> IIRC, the agpgart driver needs to write to some PCI config-space registers, 
> which Xen currently disallows.  The output you've posted suggests it also 
> needs to see some special bridges too.  Xen hides bridge devices from dom0 
> because for all other purposes, it's not necessary to reveal them.
> 
> It may not be too hard to get arggart working (although it's unlikely to 
> happen for 2.0).  If you (or anyone else) is interested in playing around 
> with this, we'd provide support.  It seems likely that someone here will get 
> round to implementing this eventually though...

Actually we're quite forgiving about what can be written to the PCI
config space as there is often all kinds of device-specific stuff
hidden in there. But, yes, we do enough cooking of accesses that we're
almost certainly messing up in this case.

 -- Keir


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