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
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.