qvm-pci updated to new devices API miss entries in "used by" column

[marmarek]

How to file a helpful issue

Qubes OS release

R4.3

Brief summary

Column "used by" doesn't always include qube to which device is assigned

Steps to reproduce

1. Create sys-usb on a system with multiple usb controllers
2. Observe qvm-pci ls or qvm-pci ls sys-usb output

Expected behavior

All USB controllers assigned to sys-usb gets sys-usb listed in "used by" column.

Actual behavior

Only some controllers gets the "used by" entry.
In my case I tested it with test-sys-usb:

$ qvm-pci ls test-sys-usb
BACKEND:DEVID  DESCRIPTION                                                                           USED BY
dom0:00_0d.0   USB controller: Intel Corporation Tiger Lake-LP Thunderbolt 4 USB Controller          
dom0:00_0d.2   USB controller: Intel Corporation Tiger Lake-LP Thunderbolt 4 NHI #0                  
dom0:00_0d.3   USB controller: Intel Corporation Tiger Lake-LP Thunderbolt 4 NHI #1                  sys-usb (no-strict-reset=True, permissive=True), test-sys-usb (no-strict-reset=True)
dom0:00_14.0   USB controller: Intel Corporation Tiger Lake-LP USB 3.2 Gen 2x1 xHCI Host Controller  

It isn't better when listing all devices.

Relevant part of qubes.xml:

      <devices class="pci">
        <device backend-domain="dom0" id="00_0d.0" required="yes">
          <option name="no-strict-reset">True</option>
        </device>
        <device backend-domain="dom0" id="00_0d.2" required="yes">
          <option name="no-strict-reset">True</option>
        </device>
        <device backend-domain="dom0" id="00_0d.3" required="yes">
          <option name="no-strict-reset">True</option>
        </device>
        <device backend-domain="dom0" id="00_14.0" required="yes">
          <option name="no-strict-reset">True</option>
        </device>
      </devices>

[marmarek]

@piotrbartman