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Install guide for QEMU and VFIO

ArchLinux

Install the necessary packages

# pacman -S qemu ovmf

Enabling IOMMU support on boot

For systemd-boot, edit /boot/loader/entries/arch.conf and add intel_iommu=on OR amd_iommu=on and iommu=pt.

# AMD
options root=/dev/sda2 amd_iommu=on iommu=pt
---------------------------------------------
# Intel
options root=/dev/sda2 intel_iommu=on iommu=pt

For GRUB edit /etc/default/grub and append your kernel options to the GRUB_CMDLINE_LINUX_DEFAULT.

# AMD
GRUB_CMDLINE_LINUX_DEFAULT="amd_iommu=on iommu=pt"
---------------------------------------------------
# Intel
GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=on iommu=pt"

And then automatically re-generate the grub.cfg file with:

# grub-mkconfig -o /boot/grub/grub.cfg

Reboot.

After reboot IOMMU should be working

[yu@ryzen ~]$ dmesg | grep -e DMAR -e IOMMU
--------------------------------------------
[    0.492684] AMD-Vi: IOMMU performance counters supported
[    0.494370] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40
[    0.494644] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).

That's everything, unlike two GPU passthrough you don't need to load kernel modules on boot.

For more information refer to this guides

https://wiki.archlinux.org/index.php/QEMU https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF https://www.se7ensins.com/forums/threads/how-to-setup-a-gaming-virtual-machine-with-gpu-passthrough-qemu-kvm-libvirt-and-vfio.1371980/