IOMMU PCI Passthrough in Proxmox

IOMMU (Proxmox)

With IOMMU you can pass PCI devices (such as LSI HBA controllers) directly to VMs.

Setup

1. Make sure all virtualization options are enabled in BIOS/UEFI.
2. Add the following to /etc/default/grub:

   GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on"
   update-grub

3. Add the following to /etc/kernel/cmdline:

    intel_iommu=on
   proxmox-boot-tool refresh

4. Add the following to /etc/modules:

   vfio
   vfio_iommu_type1
   vfio_pci
   vfio_virqfd

5. Reboot the server.

Troubleshooting

If you get an error when assigning an LSI card via passthrough, disable the “ROM-bar” option in the VM settings.

Video: https://www.youtube.com/watch?v=_hOBAGKLQkI