Xen guest OS broken after upgrading from FC5 to FC6 ;(

[mantra UNIX]

I have SuSE 10 running on top of FC5 successfully for a quite a while now,
But after upgrading to FC6 i get the following error stating Xen guest.

...
running non PAE kernel on PAE kernel ....
...

1. whats is this PAE stuff ?
2. how do i get the guest running again ?


Thanks,
MantraU
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