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

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

Mario

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