How to Enable PCI Passthrough on Proxmox

First, enable IOMMU on your motherboard (also known as VT-d for Intel chips), then boot to Proxmox.

Access the shell of Proxmox and input the following:

• Edit GRUB:

nano /etc/default/grub

• (For Intel Chips): Change ‘GRUB_CMDLINE_LINUX_DEFAULT=’ to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on"

• (For AMD Chips): Change ‘GRUB_CMDLINE_LINUX_DEFAULT=’ to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet  iommu=pt"

Save the changes using Ctrl+O and then exit using Ctrl+X

• Run this command to update GRUB

update-grub

Reboot Proxmox

You can verify the commands work by running:

dmesg | grep -e DMAR -e IOMMU

In your desired VM settings, you can now pass through your PCI device to the virtual machine