Re: [Qemu-devel] [vfio-users] [PATCH v2 1/3] input: add qemu_input_qcode_to_linux + qemu_input_linux_to_qcode

[Gerd Hoffmann]

On Mo, 2016-01-04 at 10:10 +0000, Jonathan Scruggs wrote:
> Hi,
> 
> 
> I tried these patches with qemu 2.5.0 on Gentoo and libvirt. I get the
> following error:
> Error starting domain: internal error: early end of file from monitor:
> possible problem:
> 2015-12-22T21:51:20.659520Z qemu-system-x86_64:
> -input-linux 
> /dev/input/by-path/pci-0000:00:14.0-usb-0:12:1.0-event-kbd,grab-all=on: Could 
> not open '/dev/input/by-path/pci-0000:00:14.0-usb-0:12:1.0-event-kbd'
> 
> 
> I also tried setting /dev/input/event9 to permissions of 666 to see if
> it was a permission error, but the same thing happened. Any help would
> be appreciated.

libvirt uses cgroups to restrict qemu.  You can tweak cgroup_controllers
in /etc/libvirt/qemu.conf, when you remove "devices" controller it
should work (unless something else like selinux or apparmor applies
additional restrictions).

HTH,
  Gerd