[Qemu-devel] [Bug 1377095] Re: KVM guest VM does not reattach a throughpassed USB printer from Host after switching printer off and on

[123p]

This is a very annoying bug, and it is still not solved after six
months, last versions tested with the bug:

KVM host qemu version 2.2.1

KVM host Linux version 3.14.37

Please fix this.

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https://bugs.launchpad.net/bugs/1377095

Title:
  KVM guest VM does not reattach a throughpassed USB printer from Host
  after switching printer off and on

Status in QEMU:
  New

Bug description:
  
  Host OS: Gentoo, all packages built 2014-10-01

  qemu version 2.1.0-r1

  Linux kernel 3.14.14   x86_64 Intel(R) Core(TM) i3-3220T CPU @ 2.80GHz
  GenuineIntel GNU/Linux

  
  Guest VM: Debian 7 (Wheezy) Linux 3.2.0 686

  
  Start command:
  /usr/bin/qemu-system-i386 -enable-kvm -name wheezy -k de -serial null 
-parallel null -hda /var/kvm/wheezy.kvm-img -daemonize -net 
nic,macaddr=02:00:00:00:01:31 -net tap,ifname=tap3,script=no,downscript=no -m 
512 -pidfile /var/run/kvm/wheezy.pid -usb -usbdevice tablet -runas myuser -vnc 
127.0.0.1:3 -usbdevice host:04e8:3242

  Problem:
  USB printer pass-through from KVM host to guest vm only works if I start the 
qemu kvm when the USB printer (vendor/product ID 04e8:3242) is switched on and 
therefore shown in lsusb on the host. Then it is available in the started VM.

  But when I switch the usb printer attached to the host off, it
  disappears in lsusb both on the host and the VM (as expected) but when
  I switch the USB printer on again, it is shown on the host and also on
  the QEMU Monitor (Crtl Alt Shift 2 -> info usbhost), but in the VM
  lsusb does not show it again- so USB pass-through / hot plugging does
  not work. It worked with a previous Version of qemu (1.0 or
  something).

  That is very annoying, because every time I want to print something, I need 
to shutdown the VM, start the printer, and then start the VM (which runs cups 
as printer server).
  But after printing, I do not want the printer to keep running, so I switch it 
off.

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