ProxMox - Enable IOMMU using systemd

readme.md

ProxMox - Enable IOMMU using systemd

You found that you are using systemd, adding bits to GRUB will not work. Instead, follow these steps:

Edit the kernel command line

Open the /etc/kernel/cmdline file for editing:

nano /etc/kernel/cmdline

Add the following line for AMD CPUs:

root=ZFS=rpool/ROOT/pve-1 boot=zfs amd_iommu=on iommu=pt pcie_acs_override=downstream,multifunction

note: For intel, just replace amd with intel, like so: intel_iommu=on

Refresh the boot tool

After editing the /etc/kernel/cmdline file, refresh the boot tool by running:

proxmox-boot-tool refresh

With these steps, you should have successfully enabled IOMMU and ACS patch using systemd for your Proxmox installation.

So, my fs is ext4.
i'm guessing that

root=EXT4=rpool/ROOT/pve-1 boot=ext4 intel_iommu=on iommu=pt pcie_acs_override=downstream,multifunction

should do the trick for me, no?

and my cmdline file is totally empty, btw