Raspberry 5, PCI passthrough

[dreyloft]

Proxmox is running on Raspberry Pi 5, using an additional PCIe Sata Controller connected to HDDs (working fine).
Goal is to pass through this PCI device to an Open Media Vault VM (for SMART values and spin down possibilities)

I am trying it by using the simple GUI:

Getting the issue "No IOMMU detected, please activate it.See Documentation for further information."

And VM start gets canceled by Task error:

If I understand it correctly in the Proxmox Forums this IOMMU error is (most properly) a hardware incompatibility issue, is that correct or is there a known workaround?

[dandycyclone]

It might not work at all with the current hardware/kernel: https://github.com/jiangcuo/Proxmox-Port/wiki/Resource_PassThrough - in case of rk3588 and rockchip kernel I personally failed to make IOMMU working (visible with the same symptoms you described). For RPi5 it potentially could be the option (supported), so look into Wiki page in this project and also follow guidelines from https://pve.proxmox.com/wiki/PCI_Passthrough - at least it will give you enough pointers to understand, if IOMMU is going to work with RPi5.