Comment by zargon

I'm not the person you replied to, but I'm in a situation where I want GPU passthrough to Linux guests. The problem is that the Looking Glass guest application for linux is unmaintained. This makes it impossible to have the same setup but with a linux guest instead of Windows.

If you want to have GPU accelerated video output from a guest vm to a linux host, the only way is with a Windows guest (to the best of my knowledge). If you just need compute then that is different.