Practical Homelab

Proxmox Enable IOMMU

—

by

Jerico
vi /etc/default/grub

Find the line with "GRUB_CMDLINE_LINUX_DEFAULT"

Add `intel_iommu=on` or `amd_iommu=on`

Save

`update-grub`

PCIe ACS Override

There are motherboards that bundle peripherals together (does not support ACS)

A workaround is to override PCIe ACS by adding pcie_acs_override=downstream,multifunction in GRUB_CMDLINE_LINUX_DEFAULT

This flags the kernel that a device can be “isolated”. It might have security and stability issues.

References

  • [PATCH] pci: Enable overrides for missing ACS capabilities https://lkml.org/lkml/2013/5/30/513
  • IOMMU Groups, inside and out http://vfio.blogspot.com/2014/08/iommu-groups-inside-and-out.html