Re: [Xen-devel] AMD GPU passthrough in Xen

["Zytaruk, Kelly" <Kelly.Zytaruk@xxxxxxx>]

Hi Peter / Sander,

Yes, I have AMD GPU passthru working as both primary and secondary passthru.  
Secondary was easy but primary is a bit tricky.  

Getting on to your questions;

> Is there any specific reason you're using Xen 4.2 rather than 4.4.1?

I am working on a project that is based on Xen 4.2 (I can't say any more than 
that).  I have looked at some of the more recent versions just to check if some 
of the bugs that I have seen have been fixed but I have not studied the newer 
versions in detail.  At some point in time in the future I would like will make 
the jump to a more recent version but I don't know the scheduling of that.

> In 4.2, using xl or xm?

xl

> qemu-traditional (with rombios) or "upstream"

qemu-traditional

> Primary or secondary passthrough?

Both but I am focusing on secondary right now.

> Presumably 64 bit versions of Windows?

32 bit and 64 bit Win7.  I have tested Win8.1 and it works but my focus is 
currently Win7

> I am quite willing to test various scenarios. I've a 6950, 6450 and 5450.

Awesome.  My goal right now is obtaining stability on Xen 4.2.  Since 4.2 is 
past its feature cutoff I won't be able to submit any open source changes for 
it.  I would like to eventually work with the community to get passthru working 
with a recent version of "upstream".  

Thanks,
Kelly



> -----Original Message-----
> From: Sander Eikelenboom [mailto:linux@xxxxxxxxxxxxxx]
> Sent: Monday, September 22, 2014 8:38 AM
> To: Peter Kay
> Cc: xen-devel@xxxxxxxxxxxxx; Zytaruk, Kelly
> Subject: Re: [Xen-devel] AMD GPU passthrough in Xen
> 
> 
> Monday, September 22, 2014, 2:16:58 PM, you wrote:
> 
> > Hi Kelly, list
> 
> > I see you're having AMD GPU success with Xen 4 2 and Linux 3.4.9. I've been
> less than successful getting passthrough working at all in Xen (although it's 
> fine
> in KVM primary passthrough as long as the BIOS is supplied as a file). Could I
> confirm the following :
> 
> > Is there any specific reason you're using Xen 4.2 rather than 4.4.1? I know 
> > in
> some ways 4.4 suffers as it's now xl only and some of the xm functionality has
> not come across.
> 
> > In 4.2, using xl or xm?
> 
> Another interesting question/aspect would be qemu-traditional (with rombios)
> or "upstream" (with seabios) ?
> 
> > Primary or secondary passthrough?
> 
> > Presumably 64 bit versions of Windows?
> 
> > My system is a bit old (Core2Quad) but as mentioned AMD passthrough works
> in KVM but I've found it tricky in Xen.
> 
> > I am quite willing to test various scenarios. I've a 6950, 6450 and 5450.
> 
> > Thanks
> 
> > Peter
> 
> 


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