The problem desribed here:
https://bugzilla.redhat.com/show_bug.cgi?id=593266
Please update
http://www.libvirt.org/formatdomain.html and describe
NEW xml tags, like <serial>xxxx</serial> for hard drive and all cpu
tags, other if any.
What cpu tag are you missing from the documentation? The description at
http://www.libvirt.org/formatdomain.html#elementsCPU is complete and
up-to-date.
Jirka