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

To: Andi Kleen <andi@xxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 25 Jun 2008 13:03:58 -0700
Cc: Mark McLoughlin <markmc@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Stephen Tweedie <sct@xxxxxxxxxx>
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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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