Using online games with gpu-acceleration in sys-gui-gpu

Would it even work? What privileges does sys-gui-gpu have?

sys-gui-gpu doesn’t provide gpu acceleration for other VMs right now:

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Could I run the program in sys-gui-gpu, and what security concerns does it bring?

Basically, sys-gui-gpu drops your dom0 display and assign it to the sys-gui-gpu VM, and you have a fedora system with direct GPU access. But you can do very little to use QubesOS from it, and I’m not even sure it’s possible to go back to the regular display without a reboot.

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It is possible if you have dual GPU and you assign only dGPU to sys-gui-gpu. Then, just “shut down” regularly sys-gui-gpu