[Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support

[Andi Kleen <andi@xxxxxxxxxxxxxx>]

Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
>
> This moves __PAGE_OFFSET up by 16 GDT slots, from 0xffff810000000000

GDT?  PDP?

> to 0xffff880000000000.  I have no general justification for this: th

This will significantly decrease the maximum amount of physical
memory supported by Linux longer term.

> "x86_64: PSE no longer a hard requirement."
>
> Because booting under Xen doesn't set PSE, it's no longer a hard
> requirement for the kernel.  PSE will be used whereever possible.

Both sound like cases of "let's hack Linux to work around Xen 
problems"

-Andi

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