Possible Regression with GPU Passthrough on Qubes OS 4.2 rc4

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Quick howto: GPU passthrough with lots of RAM

Users in this community have had a difficult time with GPU passthrough over the years. I want to share a quick recipe for how I got mine working. Motherboard chipset: Intel z790 CPU: Intel Raptor Lake series GPU: NVIDIA RTX 4090 (24GB VRAM) QubesOS version: 4.1.2 (R4.1) I followed the guide by @neowutran . However, like others, I couldn’t run the GPU VM with more than a few GB of memory. The trick was to set the max-ram-below-4g variable to 2G instead of 3.5G. I now have a VM with a 409…

Also, try to patch xen.xml only, not the stub.