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



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

GDT?  PDP?

I meant PGD slots.  Or PML4 in x86 terms.

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.

A bit, but not "significantly". We'd already discussed that if the amount of physical starts approaching 2^48 then we'd hope that the chips will grow some more virtual bits.

   J

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