this post was submitted on 10 Sep 2025
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Confirm passthrough understanding for proxmox (self.selfhosted)
submitted 6 days ago by ryokimball to c/selfhosted@lemmy.world
7 comments fedilink hide all child comments
 

I have successfully passed through a GPU to a full VM for gaming, but since reverted that to a standalone installation. So I know passthrough is possible/I'm capable of implementing it.

That said, I'm trying to plan out some clustering across at least three machines, two with GPUs and only one of those has any real heft. My understanding is that, with most/normal consumer hardware, there is not an option to split GPU load across multiple containers or VMs; once passthrough is set up, it is dedicated to that instance.

I am wondering, is this true even if I orchestrated spin up/down of the instance? For instance, can LXC1 have the GPU until I shut it down, then spin up LXC2 or VM3 to take over that same GPU without reconfiguring and restarting the host? IIRC configuring the passthrough suggested this wasn't possible but I'll have to experiment to be sure, or rely on Lemmy's expert opinion (-:

My assumption for now is that I just need to have a single guest per GPU (or buy a much more expensive card).

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[–] ryokimball 2 points 6 days ago (1 children)

I did just find this quote on reddit:

A GPU can only be passed through to the a single VM at time though Proxmox can pass it through to multiple containers (LXC) but they can only run Linux instances.

I'll have to look more into this but sounds promising

https://www.reddit.com/r/homelab/comments/18gu42z/comment/kd2vt5j/

[–] ryokimball 2 points 6 days ago (1 children)

It even sounds like this is handled on proxmox's side, no need for iommu stuff

[–] Jakeroxs@sh.itjust.works 2 points 6 days ago* (last edited 6 days ago)

The biggest challenge I ran into is keeping the drivers in sync between the host and the LXC, since one is Deb and the other is Ubuntu, the LXC tends to want to update sooner and sometimes that can break the communication.

You edit the LXCs config in proxmox to do it, sec.

Edit: This guide would probably be better then what I did a earlier this year: https://www.virtualizationhowto.com/2025/05/how-to-enable-gpu-passthrough-to-lxc-containers-in-proxmox/