Dec 13 10:20:56 xen logger: /etc/xen/scripts/vif-bridge: Successful vif-bridge online for vif2.0, bridge xenbr0.
Dec 13 10:20:56 xen logger: /etc/xen/scripts/vif-bridge: Writing backend/vif/2/0/hotplug-status connected to xenstore.
Dec 13 10:20:56 xen logger: /etc/xen/scripts/block: Writing backend/vbd/2/769/node /dev/loop2 to xenstore.
Dec 13 10:20:56 xen logger: /etc/xen/scripts/block: Writing backend/vbd/2/769/physical-device 7:2 to xenstore.
Dec 13 10:20:56 xen logger: /etc/xen/scripts/block: Writing backend/vbd/2/769/hotplug-status connected to xenstore.

oot@xen:/var/log# dpkg --list | grep xen
ii  libxen3.0                           3.0.3-0ubuntu1             library interface for Xen, a Virtual Machine
ii  python-xen3.0                       3.0.3-0ubuntu1             python bindings for Xen, a Virtual Machine M
ii  xen-hypervisor-3.0-i386-pae         3.0.3-0ubuntu1             The Xen Hypervisor for i386 (pae enabled ver
ii  xen-image-xen0-2.6.17-6-server-xen0 2.6.17-6                   Linux xen kernel binary image for version 2.
ii  xen-ioemu-3.0                       3.0.3-0ubuntu1             XEN administrative tools
ii  xen-source-2.6.17                   2.6.17-6                   Linux kernel source for version 2.6.17 with
ii  xen-tools                           2.1-4ubuntu2               Tools to manage debian XEN virtual servers
ii  xen-utils-3.0                       3.0.3-0ubuntu1             XEN administrative tools