Description of problem: RHEL4 PV x86_64 needs support for vCPU hotplug to enable xm save, xm restore, and live migrate to work.
committed in stream U5 build 42.27. A test kernel with this patch is available from http://people.redhat.com/~jbaron/rhel4/
QE ack for RHEL4.5.
*** Bug 215835 has been marked as a duplicate of this bug. ***
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2007-0304.html