zlacker

In theory, if you have two GPUs you can assign one to your gaming-vm via PCI-passthrough and use the other GPU for the rest of your computer. Then you could either use different monitors for gaming and normal work or connect both GPUs via a hardware switch to the same monitor(s).

In practise there are some issues with the specifics (like the XEN version and patchset), so it's not a turnkey solution (yet).

As long as you are only playing casually: I vaguely remember a HN article about someone using steam's inbuilt streaming and running the games on AWS GPU spot instances, at a significantly cheaper price than building an equivalent gaming pc.