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    USB Passthrough Seen as Root Hub in VM

    Scheduled Pinned Locked Moved Compute
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    • J
      johanb7
      last edited by

      Hi,

      I'm trying to connect a Serial to USB device to my Debian VM in Xen.
      The Xen Host sees the USB correct:
      Bus 002 Device 006: ID 05d1:1011 Brainboxes, Ltd

      but in the VM it shows as van HUB:
      Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

      it doesn't seems to connect to a device path like /dev/ttyusb0.
      I couldn't find any solution to get this working.

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      • K
        krakers
        last edited by

        What you see in VM is not your device. Did you enable Passthrough for device and then attached it to VM?

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        • J
          johanb7 @krakers
          last edited by

          @krakers I connected the device to the XenHost Physical, Enabled Passtrough for this device and attached it to the VM Guest and booted it.

          K 1 Reply Last reply Reply Quote 0
          • K
            krakers @johanb7
            last edited by

            @johanb7 I had the same problem in the past with FTDI-based USB device. I could see it in Xen host, but not in VM. I've spent many evenings trying to make it visible in VM, but with no luck though.

            I don't know why, but seems that some USB devices won't attach to VM.

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            • I
              infodavid @krakers
              last edited by

              @krakers Hi, I have a similar issue the lsusb command on the vm shows a different product than the real one shown on the host for an USB pass-through device. I've followed all the steps for USB pass-through, the device is seen as the real device in XenCenter too but not on the Debian vm.

              How can I fix this behavior ?

              For information, the USB controller is on a PCIe card and I've tried to use this card using PCI pass-through without success (Operation not permitted on start of the vm) as plan B.

              Thanks for your help.

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              • K
                krakers @infodavid
                last edited by

                @infodavid I don't think I managed to make it working for me. It's been 4 years and after ups and downs with using USB in VM I decided to let it go and no longer attach USB devices to VMs.

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                • I
                  infodavid @krakers
                  last edited by

                  @krakers Thanks for your answer. The behavior is very strange, the device is attached on start of the vm but status changed to 'not attached' after boot of the vm, few seconds later.

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                  • U
                    uwood
                    last edited by

                    I use VirtualHere on a Raspberry Pi as a workaround.

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                    • I
                      infodavid @uwood
                      last edited by

                      @uwood Smart workaround. Unfortunately you have to pay for VirtualHere and use another system to connect the device. It will be nice to have the USB devices working on the hypervisor.

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                      • M
                        manilx @uwood
                        last edited by

                        @uwood I also switched to use this. I had nothing but trouble with USB passthrough. While initially working all hell broke loose when I detached a host from the pool, with the USB device appearing multiple times in GUI and CLI..... had to reinstall both hosts and pool from scratch.

                        Xen is just not made for this!

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                        • I
                          infodavid @manilx
                          last edited by

                          @manilx did you try to install the server part on the hypervisor? Is there a free plan for the software?

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                          • M
                            manilx @infodavid
                            last edited by

                            @infodavid I had a dedicated VM with passtrough on xcpng serving other VM's.
                            BUT: you can't snapshot a VM with passthrough, so you cannot backup if it is running. I also found that you can't migrate it.
                            It's just NOT worth the trouble. Install the server somewehere else. You can use it free for up to 3 USB connections (I think. Just check the website).

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                            • I
                              infodavid @manilx
                              last edited by

                              @manilx so, solutions are:

                              • use a client / server solution perhaps on another system,
                              • Install some software directly on the hypervisor.
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                              • M
                                manilx @infodavid
                                last edited by

                                @infodavid Install VirtualHere server on another PC/Pie. I have it on a proxmox VM (proxmox has no issues with passthrough).

                                Install VirtualHere clients on the VM's in xcpng that need the USB devices.

                                Sleep well and backup/snapshot/migrate at will 🙂

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                                • I
                                  infodavid @manilx
                                  last edited by

                                  @manilx 0k. The device is an ups so I'll try first to install a server software on the hypervisor. I'm not very enthusiastic about adding another system just to plug that ups.

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                                  • I
                                    infodavid @infodavid
                                    last edited by

                                    Finally, I follow an existing topic and configure nut-server on the hypervisor to access the ups via usb.
                                    I know that Olivier is not fully aligned with the fact that the host is modified but IMO it is an acceptable change on my XCP-NG host.

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