Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757442AbYAXXks (ORCPT ); Thu, 24 Jan 2008 18:40:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752353AbYAXXkl (ORCPT ); Thu, 24 Jan 2008 18:40:41 -0500 Received: from gw.goop.org ([64.81.55.164]:52075 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751592AbYAXXkk (ORCPT ); Thu, 24 Jan 2008 18:40:40 -0500 Message-ID: <479921F5.9020902@goop.org> Date: Thu, 24 Jan 2008 15:40:37 -0800 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: "H. Peter Anvin" CC: Ian Campbell , Ingo Molnar , =?UTF-8?B?TWlrYSBQZW50dGlsw6Q=?= , linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , "Eric W. Biederman" Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native format. References: <1200758937-22386-2-git-send-email-ijc@hellion.org.uk> <47939363.8040603@kolumbus.fi> <1200950633.15491.21.camel@cthulhu.hellion.org.uk> <479510CE.7010706@zytor.com> <1200951996.15491.28.camel@cthulhu.hellion.org.uk> <479551FD.5040801@zytor.com> <1201023401.5643.52.camel@localhost.localdomain> <479634A9.1090908@zytor.com> <1201031325.15491.66.camel@cthulhu.hellion.org.uk> <47964B7B.9000905@zytor.com> <20080122203611.GA12892@elte.hu> <1201121530.30671.15.camel@cthulhu.hellion.org.uk> <4797E487.8010108@goop.org> <1201167544.30671.64.camel@cthulhu.hellion.org.uk> <47990BDC.4070008@zytor.com> <479912B0.2080506@goop.org> <479913BA.8000506@zytor.com> <47991809.9060903@goop.org> <47991A6C.8060007@zytor.com> In-Reply-To: <47991A6C.8060007@zytor.com> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=UTF-8; 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: 886 Lines: 20 H. Peter Anvin wrote: > While we're mucking around in this area, there is another thing which > we should eventually get around to fixing: > > we need a set of page tables with an identity mapping as well as the > kernel mapping, for trampolining (during startup, but also during > things like ACPI suspend/resume.) Right now, we let those be the > swapper page tables, but that's probably not really a good idea, since > it can hide bugs. So you're suggesting a second system pagetable which has a P=V alias as well as the normal kernel mapping, used only when we actually need that alias? Sounds simple enough to arrange. 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/