KVM QEMU Single NVIDIA GPU Passthrough with Kubuntu Host and Windows 11 Guest (/etc/libvirt/hooks/qemu.d/<VM-NAME>/prepare/begin/start.sh)

start.sh

#!/bin/bash
# Helpful to read output when debugging
set -x

# Stop display manager
systemctl stop display-manager.service

# Specific to KDE Plasma under Wayland (put your username in here instead of berny23)
systemctl --user -M berny23@ stop plasma-*

# Remove GPU kernel modules
rmmod nvidia_drm
rmmod nvidia-uvm
rmmod nvidia_modeset
rmmod nvidia

# Remove mainboard audio controller kernel modules
sudo rmmod snd_hda_intel

# Unbind VTconsoles
echo 0 > /sys/class/vtconsole/vtcon0/bind
echo 0 > /sys/class/vtconsole/vtcon1/bind

# Unbind EFI-Framebuffer
echo efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind

# Avoid a Race condition by waiting 2 seconds. This can be calibrated to be shorter or longer if required for your system
sleep 2

# Load VFIO Kernel Module
modprobe vfio-pci