@jajm1991 I did that on Ryzen also no problem with the IOMMU groups. Again you may need real Linux because you may have to rebuild the kernel with a R9 270x to get the most out of it. (it works fine with Radeon driver tho, maybe -15 or so fps) If that is the host card, if it's the guest card driver dosen't matter.
Level1 tech forums helped me to a lot of tweeking for it, I had to get pretty far up into KVM's underwear to get it running right. (at least as right as it does..) I could never solve the problem with the host stomping all over the guest CPU cores. (when the host came under heavy load the guests would suffer.) cgroups is the solution there but.. meh at that point I was like.. yeaaah.. too much work.
If your game works on Linux, an alternative solution might be just to run two X servers and not use virtualisation at all. X was designed originally with that in mind but over the years it's been hacked into a single display engine.
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