[fedora-virt] No iommu_group links in /sys/bus/pci/devices/

[Mario Ceresa]

Dear all,
following Cole's suggestions I installed the fedora-virt-preview repo and
tried again with VGA
passthrough from [1]

For this setup i use a nvidia card as the primary one and a radeon hd 7850
as the passthrough device.

However, there are no iommu_group links neither under
/sys/bus/pci/devices/0000:05:00.0/ (which is my radeon card) nor under any
of the other devices.

AFAIG it should be the vfio module which creates these links so I guess
it's not working for me.

The driver loads correctly: there are no errors in dmesg and lsmod shows:
vfio_pci               32063  0
vfio                   19210  1 vfio_pci

I added iommu=pt iommu=1 to grub

My system currently includes:

* libvrit 1.0.6
* qemu 1.5.0
* kernel 3.9.6

Maybe the kernel is outdated?

I know the functionality is experimental so it's just to know if I'm doing
some obvious mistakes.

Thanks for your help,

Best regards,

Mario

[1] https://bbs.archlinux.org/viewtopic.php?id=162768
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