[libvirt-users] Trouble creating virtio-serial device

David Richardson pudnik019 at gmail.com
Fri Nov 14 20:07:47 UTC 2014


I've running Ubuntu-14.04 as my host and my guest.  I've been trying to get
guest to host communication set up by configuring a virtio-serial device.
My xml file contains:

<channel type='unix'>
      <source mode='bind' path='/home/dave/vm1.agent'/>
      <target type='virtio' name='vm1'/>

When I start up the VM, I get the following error:

error: Failed to create domain from vm1.xml
error: internal error: process exited while connecting to monitor:
qemu-system-x86_64: -chardev
socket,id=charchannel0,path=/home/dave/vm1.agent,server,nowait: Failed to
bind socket: Permission denied
qemu-system-x86_64: -chardev
socket,id=charchannel0,path=/home/dave/vm1.agent,server,nowait: chardev:
opening backend "socket" failed

dmesg shows what appears to be an apparmor denial for mknod:

[250108.632450] type=1400 audit(1415994657.679:152): apparmor="DENIED"
operation="mknod" profile="libvirt-2fd2ec54-f644-228e-08ba-297c8b304153"
name="/home/dave/vm1.agent" pid=21856 comm="qemu-system-x86"
requested_mask="c" denied_mask="c" fsuid=112 ouid=112

I can add a line to /etc/apparmor.d/abstractions/libvirt-qemu similar to:

owner /home/dave/vm1.agent rw,

After restarting apparmor, this gets rid of the apparmor complaint, but I
still get the same error from 'virsh create vm1.xml' when trying to create
the VM.

Any suggestions for how to fix this?


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