I simply clicked on "Add Hardware" -> "USB Host Device" and clicked on the
USB printer (a Silhouette Cameo 2, not really a printer but a plotter).

Saludos,
Nahuel Greco.

On Fri, Nov 13, 2015 at 5:14 PM, Serge Hallyn <email address hidden>
wrote:

> Thanks for reporting this bug.
>
> Can you tell use exactly how you told virt-manager about the printer?
> For other types of usb devices (like an ereader) this has definately
> created the needed rules for me.
>
> Adding a blanket '/run/udev/** rw' rule would not be safe, but we should
> be able to find a way to add the needed rules through virt-aa-helper.
>
>  status: incomplete
>  priority: medium
>
>
> ** Changed in: libvirt (Ubuntu)
>    Importance: Undecided => Medium
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1515791
>
> Title:
>   apparmor for qemu is too restrictive for USB passthrough
>
> Status in libvirt package in Ubuntu:
>   Incomplete
>
> Bug description:
>   When trying to use an USB printer from a QEMU guest (created with
>   virt-manager) I get many apparmor errors in /var/log/kern.log, like:
>
>   Nov  8 18:08:00 ombu kernel: [ 8603.301618] audit: type=1400
> audit(1447016880.250:195): apparmor="DENIED" operation="open"
> profile="libvirt-3c21df5e-dfef-4cf5-8e24-aeaa47235205"
> name="/dev/bus/usb/005/016" pid=10345 comm="qemu-system-x86"
> requested_mask="rw" denied_mask="rw" fsuid=122 ouid=122
>   Nov 12 20:01:35 ombu kernel: [360670.214358] audit: type=1400
> audit(1447369295.810:1531): apparmor="DENIED" operation="open"
> profile="libvirt-3c21df5e-dfef-4cf5-8e24-aeaa47235205"
> name="/run/udev/data/c189:0" pid=8408 comm="qemu-system-x86"
> requested_mask="r" denied_mask="r" fsuid=122 ouid=0
>
>   The guest can't see the USB device at all. I solved the problem by
>   editing /etc/apparmor.d/abstractions/libvirt-qemu changing this line:
>
>    /dev/bus/usb/ r,
>
>   to this:
>
>    /dev/bus/usb/ rw,
>
>   and adding these two lines:
>
>     /dev/bus/usb/*/[0-9]* rw,
>     /run/udev/** rw,
>
>   And then restarting apparmor and libvirtd. I think a similar
>   configuration must come included in /etc/apparmor.d/abstractions
>   /libvirt-qemu by default.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 15.10
>   Package: libvirt-bin 1.2.16-2ubuntu11
>   Uname: Linux 4.3.0-040300-generic x86_64
>   ApportVersion: 2.19.1-0ubuntu4
>   Architecture: amd64
>   CurrentDesktop: Unity
>   Date: Thu Nov 12 20:10:16 2015
>   InstallationDate: Installed on 2015-10-30 (13 days ago)
>   InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64
> (20151021)
>   SourcePackage: libvirt
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   modified.conffile..etc.apparmor.d.abstractions.libvirt.qemu: [modified]
>   modified.conffile..etc.libvirt.libvirtd.conf: [modified]
>   modified.conffile..etc.libvirt.qemu.conf: [inaccessible: [Errno 13]
> Permission denied: '/etc/libvirt/qemu.conf']
>   modified.conffile..etc.libvirt.qemu.networks.default.xml: [inaccessible:
> [Errno 13] Permission denied: '/etc/libvirt/qemu/networks/default.xml']
>   mtime.conffile..etc.apparmor.d.abstractions.libvirt.qemu:
> 2015-11-12T20:03:10.223851
>   mtime.conffile..etc.libvirt.libvirtd.conf: 2015-11-12T19:32:30.170352
>
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>
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