Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757134AbYFYMkc (ORCPT ); Wed, 25 Jun 2008 08:40:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754511AbYFYMkZ (ORCPT ); Wed, 25 Jun 2008 08:40:25 -0400 Received: from smtp-out03.alice-dsl.net ([88.44.63.5]:5927 "EHLO smtp-out03.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753916AbYFYMkY (ORCPT ); Wed, 25 Jun 2008 08:40:24 -0400 To: Jeremy Fitzhardinge Cc: Mark McLoughlin , xen-devel , Eduardo Habkost , Stephen Tweedie , LKML Subject: Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support From: Andi Kleen References: Date: Wed, 25 Jun 2008 14:40:20 +0200 In-Reply-To: (Jeremy Fitzhardinge's message of "Wed, 25 Jun 2008 00:18:56 -0400") Message-ID: <87skv1r8ln.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 25 Jun 2008 12:33:03.0400 (UTC) FILETIME=[9C927280:01C8D6BF] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 817 Lines: 25 Jeremy Fitzhardinge writes: > > This moves __PAGE_OFFSET up by 16 GDT slots, from 0xffff810000000000 GDT? PDP? > 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. > "x86_64: PSE no longer a hard requirement." > > Because booting under Xen doesn't set PSE, it's no longer a hard > requirement for the kernel. PSE will be used whereever possible. Both sound like cases of "let's hack Linux to work around Xen problems" -Andi -- 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/