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With kernel -256 and later builds xenpv guests will fail to boot due to not finding their root device. From a quick check of the git history, the mostly likely cause is commit 7b34e5d

7b34e5d [virt] xen: initialize platform_pci even if xen_emul_unplug=never

It looks like the problem is that we moved a condition that used to be in an HVM only path into a PV _and_ HVM path. Thus the condition needs to be if (HVM && <condition>).

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Created attachment 573110 [details]
patch modifying the conditions

*** Bug 807454 has been marked as a duplicate of this bug. ***

Patch(es) available on kernel-2.6.32-259.el6

*** Bug 808637 has been marked as a duplicate of this bug. ***

Verified with kernel-2.6.32-259.el6 and kernel-2.6.32-265.el6. Tested both i386 and x86_64 Xen PV guests, can boot up successfully after the fix. So change this bug to VERIFIED.

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/RHSA-2012-0862.html