Looking over the patches, the infrastructural changes are quite limited. So the 
biggest hunk of change is the new driver. At least that helps in the argument 
in the sense that only Xen hosts/guests are affected. Still there are some 
things I think should be checked.
The new driver gets loaded in dom0 and pushes things into the hypervisor. What 
Xen version does this require for the hypervisor?
>From the top of my head I am not sure whether there is a 
>requirement/dependency for domU as well. But I think those probably get 
>different acpi tables coming from xen. But at least it should be verified to 
>boot older and newer guests.

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https://bugs.launchpad.net/bugs/898112

Title:
  Xen performance issue: backport acpi-cpufreq.v4 branch to 3.2 kernel
  for Precise

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