?Ovirt 4.3 only works with new 8.2 drivers from nvidia for some reason.  We ran 
into the same issue.  9.3/9.4 to be released later this month.


Kenneth Weade


________________________________
From: Fabrice Bacchella <[email protected]>
Sent: Wednesday, November 13, 2019 4:21 AM
To: users
Subject: [ovirt-users] Tesla P4 and /sys/class/mdev_bus/

I have a Tesla P4 installed on a HPE ProLiant DL360 Gen10 on a CentOS 7.7. The 
setup was running fine since at least February. I made a successful upgrade 
from oVirt 4.2 to 4.3 and CentOS 7.6 to CentOS 7.7. I was using in oVirt in a 
pass-througth setting.

I made a minor upgrade a few days ago. And since the VM is unable to see the 
Tesla P4. I think that the main problem is with mdev. vdsm-client Host 
hostdevListByCaps | grep mdev return nothing. There is no directory 
/sys/class/mdev_bus. I tried a full modload: modprobe nvidia_vgpu_vfio nvidia 
vfio_mdev mdev vfio_iommu_type1 vfio nvidia nvidia-modeset nvidia-drm 
nvidia-uvm vfio-pci. But it does nothing.

Why did my kernel think the P4 is not mdev-compatible any more ? How can I 
check that ? I think it break when upgrading my kernel from 
kernel-3.10.0-1062.1.2.el7.x86_64 to kernel-3.10.0-1062.4.1.el7.x86_64.

I tried with both the nouveau driver and the nvidia driver.
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