Intel GVT-g - ArchWiki
Intel GVT-g - ArchWiki
This can be used to create a virtual GPU that you pass to hosts. This is applicable to pretty much any Linux system like Proxmox. I do wish it supported newer hardware.
2 comments
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AMDGPU virtio native context is somewhat of an equivalent to the other options, although the pieces are not all available yet. Linux guest only as well.
And there's Venus but that's for Vulkan only (but a lot can be done with that alone on Linux guests).
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If you have an older nvidia gpu, you can use vgpu unlock to unlock these features on that.