Comment 3 for bug 1628168

So I seem to be able to reproduce this more frequently with the Ubuntu image on the page I linked above.

Looking at dmesg I see.

[ 0.638033] pci 0000:00:05.0: unknown header type 7f, ignoring device

If I go run lspci -vnnn | grep VGA on the host GPU system I see

0d:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM200 [GeForce GTX TITAN X] [10de:17c2] (rev ff) (prog-if ff)

At this point it won't launch another GPU based machine.

I'm currently trying to change the libvirt version to see if that resolves the issue based off this information http://www.spinics.net/lists/kvm/msg51006.html