[Xen-devel] Re: VT-d support proprietary NVidia/ATI GPU passthrough

[Weidong Han <weidong.han@xxxxxxxxx>]

Timothy J. Moore wrote:
> Dear Xen-developers,
>
> Now that we have IGD passthough patches in the xen source tree, would it be 
> possible to start working on support for other vendor cards?
>   
Xen already implemented basic gfx passthrough a few months ago, and 
supported "virtualization friendly" gfx passthrough, such as nVidia 
FX3800. But for most discrete GPU, they need various hacks, such as 
vBAR=pBAR.
> I know and have working the necessary patches to enable PCI/VGA Pass-through for non IGD, but it's a long way from stable - 
>
> Is there a way that vendor specific resets or FLR code could be implemented 
> that will provide a stable experience when using VGA passthrough with NVidia 
> and plugging/unplugging and starting/rebooting DomUs?
>   
yes, FLR is a problem for gfx cards which don't support standard FLR 
capability. FLR is required for passthrough, but lots of existing gfx 
cards don't have this capability, and only gfx vendors know how to 
implement vendor specific reset.
> Can the vBAR-pBAR code that Wiedong provided be implemented in a more dynamic 
> way? (currently requires static mem ranges)
>   
Yes, the patch is experimental, and not suitable for upstream now.

Regards,
Weidong
> Thanks all, anyone who could help please shout !
>
> Tim
>   

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