Also, you'll need two graphics adapters for this.
And I think it's been catching on a lot more now that both Intel offers VT-d standard in most of it's chips. So does AMD with its SVM equivalent.
I like this approach Valve is taking better than resorting to VMs though. I'll probably continue to use my GPU passthrough setup for now but when the game compatibility on this gets better I'll likely switch.
Also novidia is known to block driver installs from a VM because “you should be using a professional GPU for that” but there are ways to trick the installer.
If I imagine the average PC gamer, I don't think they would be able to troubleshoot any problems. Once you get into setting up storage pools (libvirt) or having to edit the libvirt XML file (want to have host native Audio?) and of course installing all those drivers for optimal performance (digging up the correct CD image and mounting it is not trivial either.
edit: here's a receipe: https://github.com/joeknock90/Single-GPU-Passthrough
[1] - https://steamcommunity.com/discussions/forum/9/1355103931983...
what host os, guest os, virtualization stack (vmware??), video card combo is working for you?
Cheers.