------- Comment From [email protected] 2019-03-25 10:39 EDT-------
Steps to reproduce the issue:

In order to reproduce the behavior, it is necessary to have a crypto
adapter assigned to the hypervisor LPAR.

The following link contains instructions on how to setup a vfio-ap
matrix device.

http://kvmonz.blogspot.com/2018/12/qemu-v31-released.html

Running virsh nodedev-list before and after construction the matrix device 
should expose the issue.
If libvirt bails out on the vfio-ap device, all devices that would be scanned 
subsequently will vanish from the returned list of devices.

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https://bugs.launchpad.net/bugs/1818854

Title:
  [Ubuntu] vfio-ap: add subsystem to matrix device to avoid libudev
  failures

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