Hi John,
so you got the forwarding working, but then couldn't use it in the guest - sad 
to hear after all the effort you did :-/
And to confirm: now you are trying to revert the to the former normal setup and 
just forward e.g. the USB devices itself.

I agree - all the settings in /sys about unbind/bind/vfio_pci would be lost on 
a reboot.
Reading that you now after a reboot no more get it bound "normally" by the Host 
kernel is odd, but the runtime changes I suggested are not the reason as they 
are lost.

Maybe one of your former /etc based modprobe/unbindpci changes now finally kick 
in and work?
Try to revert all those.

You can remove all the files you created in that regard, and in addition let 
dpdk check if there are others still modified to check those files.
$ sudo dpkg --verify

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https://bugs.launchpad.net/bugs/1781891

Title:
  PCI USB card passthrough does not work any more

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