Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754353AbYFYUEd (ORCPT ); Wed, 25 Jun 2008 16:04:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751617AbYFYUEY (ORCPT ); Wed, 25 Jun 2008 16:04:24 -0400 Received: from gw.goop.org ([64.81.55.164]:32939 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750825AbYFYUEY (ORCPT ); Wed, 25 Jun 2008 16:04:24 -0400 Message-ID: <4862A4AE.2060704@goop.org> Date: Wed, 25 Jun 2008 13:03:58 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Andi Kleen CC: Mark McLoughlin , xen-devel , Eduardo Habkost , Stephen Tweedie , LKML Subject: Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support References: <87skv1r8ln.fsf@basil.nowhere.org> In-Reply-To: <87skv1r8ln.fsf@basil.nowhere.org> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 839 Lines: 28 Andi Kleen wrote: > Jeremy Fitzhardinge 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/