Comment 4 for bug 1193202

The two additional changes beside the rebase are just adapting code in xen classic that resides in files that have been copied from x86. The original x86 changes were very specific to either hardware or situations. So unlikely it can be verified directly on EC2. Ran the security-regression test over a 32 and 64 bit PVM on my test system without issues. That should be as good as it gets.