XenServer issue with Nvidia GRID K2 (Gpu-passtrhough)

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1

Hi all,

i have an issue on my XenServer Host. Infact, after a reboot of this, i receive some permission errors like these:

[root@snsg02044 ~]# nvidia-smi
No devices were found. Please make sure /dev/nvidia* files are readable by current user.

[root@snsg02044 ~]# nvidia-debugdump --list
Found 1 NVIDIA devices
Warning: No permission to talk to device 0000:9F:00.0.

[root@snsg02044 ~]# nvidia-smi -L
Unable to determine the device handle for gpu 0000:9F:00.0: Insufficient Permissions

[root@snsg02044 ~]# lspci | grep NVIDIA
9f:00.0 VGA compatible controller: NVIDIA Corporation GK104GL [GRID K2] (rev a1)
a0:00.0 VGA compatible controller: NVIDIA Corporation GK104GL [GRID K2] (rev a1)

Only one Virtual machine succeeds to start correctly through gpu-passthrough while another one return this error:

No devices were found. Please make sure /dev/nvidia* files are readable by current user.

Before the host reboot, all works fine.

Can you help me?

Thanks

2

Are you trying to use vGPU or Passthrough? …

It sounds like Passthrough. If so, then no need to install the GRID .rpm in Xen as it’s not used. If there is no .rpm installed, nvidia-smi won’t be available as it’s a feature of vGPU.

Regarding the second VM not starting, has Xen consumed one of the GPUs for its self?

Regards