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

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Message-ID: <C48850E0.231A8%keir.fraser@eu.citrix.com>
Date:	Wed, 25 Jun 2008 19:45:36 +0100
From:	Keir Fraser <keir.fraser@...citrix.com>
To:	Andi Kleen <andi@...stfloor.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Mark McLoughlin <markmc@...hat.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Tweedie <sct@...hat.com>
Subject: Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for
 64-bit Xen support

On 25/6/08 13:40, "Andi Kleen" <andi@...stfloor.org> wrote:

>> 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.

What does Linux expect to scale up to? Reserving 16 PML4 entries leaves the
kernel with 120TB of available 'negative' address space. Should be plenty, I
would think.

 -- Keir


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