Re: [Xen-API] XCP 1.6 and GPU passthrough

[Gizmo Chicken <gizmochicken@xxxxxxxxx>]

Hi Guillaume,

I'm not quite sure if I follow what problem you are experiencing, but if it helps:

Yes, I was able to achieve GPU passthrough to an Ubuntu 12.04 HVM guest with a 3D graphic card (Radeon HD 6670) on XCP 1.6.  

In my case, GPU passthrough to an Ubuntu 12.04 HVM guest "just worked" without much effort.  In fact, I didn't employ either the "xen-pciback.hide" option or the "xe vm-param-set other-config:pci=" command that you mentioned.  Instead, I simply (1) selected my card from the dropdown menu in the appropriate properties section of XenCenter, and (2) installed the fglrx (not fglrx-updates) driver from the "additional drivers" within the Ubuntu 12.04 HVM guest.  After that, I rebooted the VM and GPU passthrough just worked.

Regarding the "xe vm-param-set other-config" command that you mentioned, I successfully activated PCI passthrough to multiple devices (including usb controllers) using xe command taking the following form:

xe vm-param-set other-config:pci=0/<pci-id#>,1/<pci-id#>,2/<pci-id#>  uuid=<uuid> 

But gain, the above xe command was not needed (nor did I even try it) for GPU passthrough to an Ubuntu 12.04 HVM guest.

Hope the above helps.

Regards,
GizmChicken

P.S.  Although GPU passthrough to an Ubuntu 12.04 HVM guest worked for me without effort, I have had absolutely no luck getting GPU passthrough to an Ubuntu 12.10 HVM guest (or Ubuntu 13.04 HVM guest) to work.  Not sure what is the difference.

On Tue, Mar 12, 2013 at 1:38 PM, Rob Hoes <Rob.Hoes@xxxxxxxxxx> wrote:

Hi Guillaume,

Is your VM a PV guest? I think you are hitting a known issue where passing through multiple PCI devices to a PV guest is not working.

Instead of using the low-level PCI passthrough options (other-config:pci), you could also try to use the dedicated GPU API that is present in XCP 1.6. I think this would only work for HVM guests, though.

To do this, try the following command to see if your card was detected by XCP:

    xe gpu-group-list

And then add a vGPU to your VM:

    xe vpgu-create gpu-group-uuid=<uuid_of_gpu_group> vm-uuid=<uuid_of_vm>

...and start you VM, and install the nVIDIA drivers.

Cheers,
Rob

> -----Original Message-----
> From: xen-api-bounces@xxxxxxxxxxxxx [mailto:xen-api-
> bounces@xxxxxxxxxxxxx] On Behalf Of Guillaume Thouvenin
> Sent: 12 March 2013 4:34 PM
> To: xen-api@xxxxxxxxxxxxx
> Subject: [Xen-API] XCP 1.6 and GPU passthrough
>
> Hello,
>
> I'm running XCP 1.6 and I installed an ubuntu 12.04.02 as a VM. My machine
> has two GPU M2070Q and I'd like to do PCI passthrough to allow my VM to
> use those GPUs.
>
> I modified the /boot/extlinux.conf to add the option "xen-
> pciback.hide=(02:00.0)(02:00.1)(83:00.0)(83:00.1)" as PCIDEV_BACKEND is
> built in the kernel (according to /boot/config-2.6.32.43-
> 0.4.1.xs1.6.10.734.170748xen
>
> I rebooted XCP but when I run lspci in dom0, pci devices 02:... and 83:... are
> still listed.
>
> I set parameter other-config in my VM by doing:
> xe vm-param-set
> other-config:pci=0/0000:02:00.0,0/0000:02:00.1,0/0000:83:00.0,0/0000:83:00.1
> uuid=b6fcf...
>
> But when I start the VM I got the following error:
>
> The server failed to handle your request, due to an internal error.
> The given message may give details useful for debugging the problem.
> message: xenopsd internal error: Xenctrl.Error("38: Function not
> implemented")
>
> I tried to replace xen-pciback.hide= by pciback.hide= as I saw both on google
> but both have the same effect.
>
> Any hints? I also like to know if someone already achieve to do PCI
> passthrouhg with a 3D graphic card on XCP 1.6? If yes can I have its recipe :)
>
> Thanks everyone for you help,
> Best regards,
>
> Guillaume
>
>
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