Howto gpu passthrough
configure grub
add the following to /etc/default/grub:
for intel:
GRUB_CMDLINE_LINUX_DEFAULT="quiet ... intel_iommu=on"
for amd:
GRUB_CMDLINE_LINUX_DEFAULT="quiet ... amd_iommu=on"
re-configure your grub:
grub-mkconfig -o /boot/grub/grub.cfg