Description of problem: When guest config is missing serial port specification, libvirt uses "-serial none" qemu option. However, this breaks xen qemu as it does not implement proper handling for none value of serial. Proper handling has to be implemented.
Is this a regression? And perhaps we want this in 5.7.z anyway...
Created attachment 542410 [details] xend log
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2012-0160.html