Can theoretically game on Linux and windows at same time with just a single gpu (2080 ti), mainly use it cause I only have single gpu and I don't want to loose hardware acceleration on Linux, the nixos module both applies a the vgpu unlocker for consumer graphic cards (so u can split a gpu in multiple virtual gpus) https://github.com/DualCoder/vgpu_unlock

And merges it with the GeForce drivers so the host gpu does not stop having display output

And I just passthrough the vgpu and Xbox controllers to the vm with qemu and my main windows nvme disk (windows naturally just works inside and outside a vm for me, dual boot)