Xen 4.1.1 ps aux|grep xen

edward@pituba:~$ ps aux|grep xen
root        24  0.0  0.0      0     0 ?        S    17:49   0:00 [xenwatch]
root        25  0.0  0.0      0     0 ?        S    17:49   0:00 [xenbus]
edward    1467  0.0  0.3  33480  3640 pts/0    S+   17:54   0:00 vim xend.log
root      1605  0.0  0.1  10704  1048 ?        S    18:14   0:00 xenstored --pid-file=/var/run/xenstored.pid
root      1611  0.0  0.0  24936   648 ?        SLl  18:14   0:00 xenconsoled --pid-file=/var/run/xenconsoled.pid
root      1644  0.0  1.1  74796 11732 ?        S    18:14   0:00 /usr/bin/python /usr/sbin/xend start
root      1645  0.0  1.6 151932 16724 ?        SLl  18:14   0:01 /usr/bin/python /usr/sbin/xend start
edward    1845  0.0  0.1   9088  1124 pts/1    S+   18:34   0:00 grep --color=auto xen

edward@pituba:~$ sudo virsh -c xen:///
[sudo] password for edward:
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # version
Compiled against library: libvir 0.8.8
Using library: libvir 0.8.8
Using API: Xen 3.0.1
Running hypervisor: Xen 4.1.0