Update for Tianocore/EDK2 needed for ARM

[Elliott Mitchell <ehem+xen@xxxxxxx>]

Tianocore/EDK2 is one of the prefered Xen bootloaders.  On ARM it is
indeed very functional.  Unfortunately the change of disallowing multiple
mappings of the shared information page breaks booting with
Tianocore/EDK2.  As the change was done on Xen I suspect they would say
it is the Xen Project's job to submit a fix.

Their history suggests Julien Grall had been the liason for
Tianocore/EDK2, so you're the one I'm sending this message towards.

The attached patch restores Tianocore/EDK2's ability to function as a
DomU bootloader on Xen.  I believe this patch though is incomplete.  In
particular I believe Dev->SharedInfo is a region marked as retained by
firmware and not to be used by the OS.  This would need to be changed to
only being used until BootServices exits.

I'm not really up for polishing the patch to get it into Tianocore/EDK2.
Problem is their style seems awful to me and I don't want to finish.
Nonetheless this seems fairly crucial as DomU bootloaders are.


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