Fedora 33: Ultimiate VFIO Guide for 2020/2021 [WIP]

[artafinde]

Followed this guide for customizing my initramfs since I use dracut in Archlinux and found these:

@wendell

Create /usr/lib/dracut/modules.d/module-setup.sh with the following contents:

#!/usr/bin/bash
check() {
return 0
}
depends() {
return 0
}
install() {
declare moddir=${moddir}
inst_hook pre-udev 00 “$moddir/vfio-pci-override.sh”
}

The module-setup.sh needs to be located under the new custom module directory, in your example /usr/lib/dracut/modules.d/20vfio/module-setup.sh (or /usr/lib/dracut/modules.d/30vfio/module-setup.sh if you stick to 30 priority)

@wendell

Create /etc/dracut.conf.d/vfio.conf with this contents:

dd_dracutmodules+=" vfio "
force_drivers+=" vfio vfio-pci vfio_iommu_type1 "
install_items="/usr/sbin/vfio-pci-override.sh /usr/bin/find /usr/bin/dirname"

The dd_dracutmodules+=" vfio " should be add_dracutmodules+=" vfio ".

When executing the dracut command check for a line in info logs (-v not required) which loads the custom module:

[..]
dracut: *** Including module: vfio ***
[..]

To verify after reboot check which modules each GPU has loaded:

sudo lspci -v -d 10de:1e84 | grep -E '(VGA|driver)'
0c:00.0 VGA compatible controller: NVIDIA Corporation TU104 [GeForce RTX 2070 SUPER] (rev a1) (prog-if 00 [VGA controller])
        Kernel driver in use: vfio_pci