[vfio-users] Processor Root Ports appeared in iommu_groups - why?

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I've migrated through the whole 4.1 kernel branch and currently i am using
4.2.3-200.fc22-x86_64...
And i don't remember my pci-e root ports being in the same group as my GPUs.

"qemu-system-x86_64: -device
vfio-pci,host=01:00.0,id=hostdev0,bus=pci.0,addr=0x3,rombar=1,romfile=/mnt/hdd/qemu/hybridmagic.rom:
vfio: error, group 1 is not viable, please ensure all devices within the
iommu_group are bound to their vfio bus driver."
(and the same for the second GPU)
which leads us to:
./1/devices:
0000:00:02.0  0000:01:00.0  0000:01:00.1
and
./2/devices:
0000:00:04.0  0000:02:00.0  0000:02:00.1
where 01:00.0 and 02:00.0 are GPUs, and 04.0 and 02.0 are Processor Root
Ports.

...should i bind them too?
What was changed and why?

This is an AMD FM2 system, i've thought ACS problems are specific to intel
systems.
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