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

Reboot.

For `GRUB` edit `/etc/default/grub` and append your kernel options, `intel_iommu=on` OR `amd_iommu=on` and `iommu=pt`, 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:

$ 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

ArchWiki QEMU

ArchWiki PCI passthrough via OVMF

How to setup a gaming virtual machine with gpu passthrough qemu kvm libvirt and vfio

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