The Xen Configurations module allows you to view UUID, power state of Virtual Machines and Virtual Functions assigned to them.
You can perform various system power options like start, resume (if VM is paused), turn off, restart and suspend (pause) a VM. You can perform same actions on multiple virtual machines. To do so, click on the machine names in the list. The properties box will display the power state of the machines selected. Now, click on any of the system power actions provided at the bottom.