[Xen-devel] Re: Xen VGA graphics passthrough for secondary adapters, vBAR=pBAR etc

[Christian Tramnitz <chris.ace@xxxxxxx>]

12.04.2010 09:21, Pasi Kärkkäinen wrote:
> Hello,
>
> Now that Xen 4.0.0 is out and has support for primary graphics passthru
> and many people have been using it already and asking for a status update
> for secondary adapter passthru I thought of opening a new thread about this.
>
> What are the actual issues that need to be resolved to get the
> secondary graphics passthru working? Probably related to VGA BIOS execution
> in the guest?
>
> How about the vBAR=pBAR stuff required for some (Nvidia) cards?
> How do we get that functionality integrated so people don't need additional 
> patches?
>
> Was there also a problem that a working VGA BIOS cannot be copied from some 
> cards
> and they need to use/load it from a file?
>
> Thanks!
>
> -- Pasi
>
> btw. I've created a wiki page where we can list all the tested/working graphics 
> adapters:
> http://wiki.xensource.com/xenwiki/XenVGAPassthroughTestedAdapters

I already added that suggestion to the 4.1 suggested features some days 
ago and planned to rebase the patches to 4.0 if they need any adjustments.
One major change I'd like to see is dynamic (and thus optional) 
configuration of the mem space to be mapped and the BIOS file to be used 
(instead of configuration at compile time).
Also afair the previous patch set also had a maximum size (correct me if 
I'm wrong) for the BIOS size that was to small for recent (HD4800+) ATI 
devices.

Best regards,
   Christian


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