Correct to the above:  EHCI not xHCI
qvm-pci
which produced
dom0:00_14.0 USB controller: ... - LP USB xHCI Controller  sys-usb 
(no-strict-reset=True)
dom0:00_1d.0 USB controller: ... - LP USB EHCI Controller  sys-usb 
(no-strict-reset=True)

Further -
I initiated a qvm-start for sys-usb which produced:
xl top
showed sys-usb as paused for about 60 seconds, then it disappeared from the 
display.
The CLI returned:
Start failed: internal error: Unable to reset PCI device 0000:00:14.0:  
internal error: libxenlight failed to create new domain 'sys-usb'

When I execute:
qvm-pci attach --persistent -o no-strict-reset=True sys-usb dom0:00_14.0
an error is produced:
"'device dom0:00_14.0 of class pci already attached to sys-usb'"

Since I don't know if this means the attachment is persistent (it was 
repeatable after a reboot), I attempted to detached
qvm-pci detach sys-usb dom0:00_14.0
qvm-pci detach sys-usb dom0:00_1d.0

Using qvm-pci list, both were gone, no longer listed.
So I again performed the attachment as above.
Both instances are back in.  I do not see any difference from that display.

I started up sys-usb from CLI and received the same error about libxenlight 
failing.


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