Comment 17 for bug 1546565

Never mind... I'm reading the "ubuntu-fix-vhost-user-socket-permission.patch" file:

---
+* ``--vhost-owner``
+
+ When creating vhost_user sockets change owner and group to the specified value.
+ This can be given as ``user:group``, but also only ``user`` or ``:group`` are supported.
+
+ Examples::
+
+ --vhost-owner 'libvirt-qemu:kvm'
+ --vhost-owner 'libvirt-qemu'
+ --vhost-owner ':kvm'
+
+* ``--vhost-perm``
+
+ When creating vhost_user sockets set them up with these permissions.
+
+ For example::
+
+ --vhost-perm '0664'
---

I'll try it now...

Cheers!
Thiago