Re: [Xen-devel] ATI VGA passthrough and S400 Synchronization module

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jul 24, 2012 at 04:05:20PM +0000, Aurélien MILLIAT wrote:
> Hi,
> 
> I'm currently trying to use XEN on graphical cluster.
> VGA passtrough works fine and I'm able to use quad-buffer for active stereo.
> The last thing to do is to synchronize all GPU from the cluster.
> For this purpose I use ATI FirePro S400 and it didn't works.
> 
> I've seen two behaviors:
> -When I run lspci command on Dom0 I've got:
> 0f:00.0 VGA compatible controller: ATI Technologies Inc Device 6888
> 0f:00.1 Audio device: ATI Technologies Inc Cypress HDMI Audio [Radeon HD 5800 
> Series]
> And sometimes just
> 0f:00.0 VGA compatible controller: ATI Technologies Inc Device 6888
> -When a DomU(Windows 7) is running, it's very slow (I can't do anything) and 
> crash after several minutes.
> I've tried with the unstable version and I've seen the same 'lspci' behavior.
> 
> I've a couple of questions:
> Is it possible to passthrough a VGA with this extension?

I never tried. I just pass in the VGA card and don't try to pass in the HDMI 
driver.

> As it's a particular use of VGA passtrough is it planned to able to use 
> synchronization module?

So what is synchronization module for you? That is the HDMI part?

> Is it easy to add this feature (time cost)?
> 
> Computers : HP Z800 workstation
> GPU: ATI FirePro V8800
> CPU: Intel Xeon E5640
> MB: Intel 5520 chipset
> 
> XEN :
> Version  4.1.2
> With ATI patch from 
> http://old-list-archives.xen.org/archives/html/xen-users/2011-05/msg00048.html
> Thanks,
> Aurélien Milliat
> 
> 

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