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

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Message-ID: <4862A4AE.2060704@goop.org>
Date:	Wed, 25 Jun 2008 13:03:58 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Mark McLoughlin <markmc@...hat.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Stephen Tweedie <sct@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support

Andi Kleen wrote:
> Jeremy Fitzhardinge <jeremy@...p.org> 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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