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moffo

Member

Registered: 2020-12-15

Posts: 2

IOMMU-Groups are wrongly seperated[SOLVED]

Hello,
I wantet to passtrough my 2nd GPU to my Win-VM via QEMU and VFIO, but after changing my CPU to a Ryzen 7 3700x and updating my BIOS
I have now wrongly seperated IOMMU-Groups. With my last CPU and BIOS it worked quite well but now it changed and my first and second GPU are now in the same group.

Current groups:

[    0.886954] pci 0000:27:00.0: Adding to iommu group 2
[    0.886959] pci 0000:27:00.1: Adding to iommu group 2
[    0.886962] pci 0000:28:00.0: Adding to iommu group 2
[    0.886966] pci 0000:28:00.1: Adding to iommu group 2

0000:27:00.0
0000:28:00.0:

• 0000:27:00.0 1st GPU

• 0000:28:00.0 2nd GPU

current kernel parameter:

amd_iommu=on

kernel:

5.9.14-zen1-1-zen

mkinitcpio-config:

modules: vfio_pci vfio vfio_iommu_type1 vfio_virqfd amdgpu

I tried to add the acs-override boot parameter but I can not get the patch to work. I tired to add amd_iommu=forceisolation as boot parameter but this didnt work too.
MB: MSI X470 Gaming pro max
GPU-1: RX 580 1st PCIe x16 Slot
GPU-2: GTX 960 2nd PCIe x16 Slot
Hope you can help me.

Last edited by moffo (2020-12-15 12:43:59)

moffo

Member

Registered: 2020-12-15

Posts: 2

Re: IOMMU-Groups are wrongly seperated[SOLVED]

Solved it, downgraded my BIOS to version 7B79vM3.