Comment by jeroenhd

Even with SEV, you need hardware passed through to the VM. That means either running two GPUs or hot-swapping the machine your GPU is connected to and hoping neither driver crashes and burns (which is what you can expect from any consumer GPU driver that tries to hotplug). The software will also break the moment someone finds yet another side channel attack to break memory encryption. Intel's attempts at secure hardware hypervisors failed so bad they took the hardware out of consumer chips.

In theory you could probably get it to work on some hardware given some boot configurations with some games, but what game developer is going to develop a bespoke Linux VM? And if not the game developer, what Linux developer is going to spend time developing a platform that caters to the wishes of closed-source, rootkit-driven anticheat developers?