Re: [Xen-API] GPU passthrough: multiple vGPUs on the same VM

[Andrea Curtoni <andrea.curtoni@xxxxxxxxxxxxxxxxx>]

Hi Rob,

Âthanks for the suggestion on other-config:pci, I just tested it and it worked!

Regards,

Andrea

On Thu, Jul 11, 2013 at 6:08 PM, Rob Hoes <Rob.Hoes@xxxxxxxxxx> wrote:

Hi Andrea,

Â

You are right: the feature is currently restricted to a single GPU per VM. You could try manually passing through the PCI devices of multiple GPUs using âother-config:pciâ.

Â

I donât think there are any plans to change this at the moment. Could you explain why passing through multiple GPUs to a single VM would be useful for you?

Â

Cheers,
Rob

Â

From: xen-api-bounces@xxxxxxxxxxxxx [mailto:xen-api-bounces@xxxxxxxxxxxxx] On Behalf Of Andrea Curtoni
Sent: 11 July 2013 4:36 PM
To: xen-api@xxxxxxxxxxxxx
Subject: [Xen-API] GPU passthrough: multiple vGPUs on the same VM

Â

Hello,

Âit looks like it is currently not possible to attach multiple vGPUs to the same VM. I tried with XenServer 6.2 and suspect the same happens with XCP 1.6.

Â

I'm successfully using an NVIDIA card in GPU passthrough from a VM but when I try to attach a second vGPU I get the following error:

Â

[root@xenserver ~]# xe vgpu-create vm-uuid=... gpu-group-uuid=...

A device with the name given already exists on the selected VM

device: 0

Â

Trying to specify a different device did not help:

Â

[root@xenserver ~]# xe vgpu-create vm-uuid=... gpu-group-uuid=... device=1

The device name is invalid

device: 1

Â

I think the support for multiple vGPUs on a single VM is not implemented at the moment, I'd like to understand the following:

1) is it possible to workaround this limitation?

2) are there any plans to introduce this support in the future?

Â

Thanks in advance,

Andrea

--
Andrea Curtoni
NICE srl
andrea.curtoni@xxxxxxxxxxxxxxxxx
http://www.nice-software.com/
www.enginframe.com
TEL: +39 0141 90.15.16
FAX: +39 0141 01.98.29

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