One thought on - Use USB2.0 Camera With KVM Based VM

• I don’t either, but maybe this is helpful… According to this document, you can specify the bus that a USB device is attached to, including pass-through devices:
  http://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/usb2.txt;hb=HEAD

  So, one option would be to create a shell script that modifies the arguments given to qemu-system-x86_64, and then use “virsh edit ”
  to replace the default emulator with the path to your shell script. I
  do that for a guest where I pass through a video card, which needs a PCI
  express bridge:

  $ cat /usr/local/bin/qemu-system-x86_64-passthrough
  #!/bin/bash

  declare -a qemuargs

  for x in “$@”
  do
  if test “${x:0:21}” == “vfio-pci,host
  :00.0”
  then qemuargs+=(ioh3420,bus=pci.0,addr.0,multifunction=on,port=1,chassis=1,id=root.1)
  qemuargs+=(-device)
  qemuargs+=(vfio-pci,host
  :00.0,id=hostvga,bus=root.1,addr.0,multifunction=on)
  else
  qemuargs+=(“$x”)
  fi done

  /usr/bin/qemu-system-x86_64 “${qemuargs[@]}”