[Qemu-devel] [Bug 1392504] Re: libvirt not relabeling devices on USB Passthrough

[Kelvin Middleton]

Hey nickmaelao, your outputs show you've only changed the ownership of
the USB bus and not the USB device itself...I'd suspect if you looked at
'ls -la /dev/bus/usb/001/' then the actual USB device will still have
root ownership.  Ergo if libvirtd is still creating the vm's with qemu
and a non-root user you will still have the problem.

chmod libvirt-qemu:kvm /dev/bus/usb/001/xxx (xxx being the USB device
numeber) should resolve.

Alternatively you could change /etc/libvirtd/qemu.conf and make libvirtd
create guests with qemu as the root user, look for the 'user = ' and
'group = ' lines.  I can't comment on the risk associated to this so
you'll need to look into that yourself but I've taken this approach and
have no problems with USB attachment and I don't need to manually change
device ownerships.

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https://bugs.launchpad.net/bugs/1392504

Title:
  libvirt not relabeling devices on USB Passthrough

Status in QEMU:
  New
Status in libvirt package in Ubuntu:
  Triaged

Bug description:
  After upgrading from Ubuntu 14.04 to Ubuntu 14.10 USB passthrough in
  QEMU (version is now 2.1.0 - Debian2.1+dfsg-4ubuntu6.1) is not working
  any more. Already tried to remove and attach the USB devices. I use 1
  USB2 HDD  +  1 USB3 HDD to a virtual linux machine; 1 USB2 HDD to a
  virual FNAS machine and a USB 2camera to virtual Win7 machine. All
  these devices are not working any more.

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