Comment 6 for bug 1801918

I now used:
  filter =[ "a|/dev/disk/by-path/virtio-pci-*|" ]

Now it really is the same way on creation and query.
$ sudo /sbin/pvcreate /dev/disk/by-path/virtio-pci-0000:00:07.0
  Physical volume "/dev/disk/by-path/virtio-pci-0000:00:07.0" successfully created.
$ sudo pvdisplay
  "/dev/disk/by-path/virtio-pci-0000:00:07.0" is a new physical volume of "30.00 MiB"
  --- NEW Physical volume ---
  PV Name /dev/disk/by-path/virtio-pci-0000:00:07.0

And with that finally
$ sudo virsh pool-build testpool1
Pool testpool1 built

$ sudo virsh pool-start testpool1
Pool testpool1 started

I'd still be interested in the mail thread link.
But for your case, if you want to use by-path with LVM you should adapt the lvm.conf to use (only) these.