On 27. 1. 2021, at 19:20, Thomas Hoberg <thomas@hoberg.net> wrote:
On Wed, Jan 27, 2021 at 9:14 AM <kim.kargaard(a)noroff.no> wrote:
Ok, I think I found at least for Nvidia. You can follow what described for RHV: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.4/...
In the same manual there are also instructions for vGPU.
There is also the guide for 4.3: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/...
Gianluca
Again, that's the easy part that works just fine. It's afterwards when you try to install the Nvidia driver when there might be trouble because the driver refused to load on GPUs that aren't permitted to operate inside a VM, quite independent of the hypervisor (same issue with VMware, VirtualBox, KVM).
For that there are tricks you'll find on the Internet on how to cheat the Nvidia driver into believing it's running on a physical machine but on KVM that implies editing the XML config... which in the case of oVirt seems to be generated at startup.
yes. you can use that.
So I guess the hooking mechanism can be used to take care of that, but I've not progressed to that stage myself, mostly because the GPUs I use in the corporate lab are whitelisted by Nvidia.
shouldn’t be too hard, you can use any of the existing hooks (even old ones) as a starting point. I think (I haven’t looked at that for a long time) that smbios modification may be enough, so there’s [1] right away. If not, it should be straightforward to adapt
And just to give a little credit: Pass-through works very well with oVirt 4.3, only moving (inactive) VMs from host-to-host is a little more involved, while GPU live-migration unfortunately is out of the question. That makes perfect sense for NICs and storage adapters, for GPUs one might argue that their state could be migrated, too. But Linux doesn't really understand heterogenous accelerators yet, so oVirt can't do better.
it’s a generic PCI VFIO passthrough, there’s nothing specific about GPU. Migrateable GPUs are not generic and will require some work, mostly in kernel/drivers. nvidia is working on it, but it’s hard to say when that’s going to be ready, and as always i doubt they’ll make it available for older/lowend cards. But then again maybe with some tricks…:) Thanks, michal [1] https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/smbios
_______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/S3DBQHTQDOZ6AS...