start.sh

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

# Load the config file with our environmental variables
source "/etc/libvirt/hooks/kvm.conf"

# Stop your display manager. If youre on kde it ll be sddm.service. Gnome users should use killall gdm-x-session instead
systemctl stop display-manager.service
pulse_pid=$(pgrep -u youruser pulseaudio)
pipewire_pid=$(pgrep -u youruser pipewire)
kill $pulse_pid
kill $pipewire_pid

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

# Avoid a race condition by waiting a couple of seconds. This can be calibrated to be shorter or longer if required for your system
sleep 5

# Unload all Radeon drivers
modprobe -r amdgpu

# Unbind the GPU from display driver
virsh nodedev-detach $VIRSH_GPU_VIDEO
virsh nodedev-detach $VIRSH_GPU_AUDIO

# Load VFIO kernel module
modprobe vfio
modprobe vfio_pci
modprobe vfio_iommu_type1