IOMMU problem when NIC passthrough to VM

[RipSaw]

I´m at a bit of a dead end and don't have other ideas to get this working.

 

My system is ASRock J3455-ITX and I'm trying to passthrough a I350 Nic to a OPNsense VM.
Problem is its bound to IOMMU groupe 4 witch contains the following:
 

[8086:5ad8] 00:13.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #1 (rev fb)
[8086:5ad9] 00:13.1 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #2 (rev fb)
[8086:5ada] 00:13.2 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #3 (rev fb)
[8086:5adb] 00:13.3 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port A #4 (rev fb)
[10ec:8168] 01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 11)
[1b21:0612] 03:00.0 SATA controller: ASMedia Technology Inc. ASM1062 Serial ATA Controller (rev 02)
    [5:0:0:0] disk ATA Hitachi HUA72302 A840 /dev/sdf 2.00TB
    [6:0:0:0] disk ATA Hitachi HUA72302 A840 /dev/sdg 2.00TB
[8086:1521] 04:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
[8086:1521] 04:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
[8086:1521] 04:00.2 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
[8086:1521] 04:00.3 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)

 

 

I have tried every PCIe ACS option to split the groupe, also trying pcie_acs_override=id of the pci bridge.
The Nic is loaded with vfio-pci.ids drivers at boot to stop unraid from assigning them to the os itself, I'm able to select the Nic in the VM menu but I get the "group 4 is not viable Please ensure all devices within the iommu_group are bound to their vfio bus driver."
The onboard Ethernet and SATA controller are use by unraid so as fare as I know I can't just go vfio-pci.ids=10ec:8168, 1b21:0612, 8086:1521.

Any help would be greatly appreciated.

Edited July 28, 2021 by RipSaw
Proper syntax

[Squid]

If you can't break apart the grouping via ACS there's not much you can do other than grab a new motherboard (with lots of expansion slots so you've got some options)