I have been looking into registering some domain events though the python Libvir API. However, I am getting errors and I believe it may be due to lack of event support in Xen. This is the error I am getting: libvir: Xen error : this function is not supported by the hypervisor: xenUnifiedDomainEventRegister Traceback (most recent call last): File "./testcallback.py", line 19, in ? conn.domainEventRegister(callback,None) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 1578, in domainEventRegister if ret == -1: raise libvirtError ('virConnectDomainEventRegister () failed', conn=self) libvirt.libvirtError: this function is not supported by the hypervisor: xenUnifiedDomainEventRegister If this lack of support is the case, what would you recommend is the best route for catching domain events? Currently, I am thinking of just polling regularly and monitoring for changes in domain state. Cheers. Chris Pyper. P.S. Libvir is awesome.