Re: [Xen-users] Video Passthrough

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 2015-03-24 14:34, CACook@xxxxxxxxxxxxxxx wrote:
> On Tuesday 24 March 2015 13:40:14 you wrote:
> > On 23 March 2015 19:56:48 GMT+00:00, CACook@xxxxxxxxxxxxxxx wrote:
> > >
> > >Has anyone been able to actually get video passthrough working in 4.5?
> > >
> > Yes, with caveats. A Quadro 6000 is working fine with Windows 8.1. A 
> > Quadro 2000 or FX3800 is ok with debian Linux. FreeBSD is not happy.
> > This is secondary passthrough. On the whole secondary passthrough is 
> > much more convenient, particularly if anything goes wrong (when your 
> > VM hangs for half an hour because the non working display should have 
> > been displaying 'checking disk' you'll want a virtual display..)
> > If your primary reason for virtualisation is GPU passthrough, KVM is 
> > definitely superior. It's easier to get working and allows for 
> > sideloading of GPU BIOSes, essential in some cases.
> > I'm going to stick with Xen for now. I'm hopeful I can convince NVidia 
> > to sort out the issues I've been having with FreeBSD and passthrough.
> > Note that if you are having issues, NVidia's list of supported VM 
> > environments is Xenserver, RHEL 7 KVM and ESXi. ESXi has the most wide 
> > ranging guest support, but has its own issues with passthrough - I 
> > cannot get the Quadro 2000 to work properly under it.
> I don't have any extra slots for another GPU.
>
> GPU passthrough isn't my primary reason for using Xen, but it is a
> vital function of one VM.
>
> So I take it that Amazon has made some special changes to Xen, to be
> able to assemble their massively-parallel GPU supercomputers.  Special
> changes that they haven't shared.
No, they use Nvidia Quadro/Tesla/Grid cards in secondary passthrough 
mode.
As I said before, that works fine. They certainly aren't passing primary
Intel GPUs to their VMs.

Gordan

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