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xen-devel
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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