VFIO with Nvidia dGPU and AMD iGPU
Helping a friend setup VFIO with an Nvidia GPU for a Windows VM, and the guide at https://docs.bazzite.gg/Advanced/dracut-and-initramfs/?h=vfio#if-you-just-plan-to-add-options-to-a-module-you-should-consider-using-a-karg is outdated, per discord chat. The goal is nothing special - just the iGPU for Bazzite, and Nvidia GPU for the VM. VM hangs on attempted boot.
Bazzite is a custom image built upon Fedora Atomic Desktops that brings the best of Linux gaming to all of your devices.
Solution
it was User Error(tm) - adding the display spice server back caused the VM to boot, the NVIDIA app installed and started downloading the drivers, ...and then my VM abruptly ran out of its VHD
