iommu=pt on ZFS system - What to set?

[brightrgb]

Hallo,

I passthrough my GPU on an AMD B550 board to an Win11 guest with PVE9.1.1.
Everything works, but in the manual is written, that i have to set "iommu=pt" to the kernel command line.

I have a zfs system. So in my opinion I have to set "iommu=pt" to systemd-boot. Is this right?

And what musst i put in systemd-boot (/etc/kernel/cmdline)?

• iommu=pt
• root=ZFS=rpool/ROOT/pve-1 boot=zfs quiet amd_iommu=on iommu=pt

Or something elese?
Or is this in PVE 9 no longer needed for passthrough?

 

[Impact]

Just add iommu=pt at the end of the existing line. intel_iommu/amd_iommu is not needed.
You can check the current boot args with cat /proc/cmdline. Also see docs here.