From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759481AbYB1Kfv (ORCPT ); Thu, 28 Feb 2008 05:35:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755747AbYB1Kfn (ORCPT ); Thu, 28 Feb 2008 05:35:43 -0500 Received: from mtaout01-winn.ispmail.ntl.com ([81.103.221.47]:14201 "EHLO mtaout01-winn.ispmail.ntl.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753736AbYB1Kfm (ORCPT ); Thu, 28 Feb 2008 05:35:42 -0500 From: Ian Campbell To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Jeremy Fitzhardinge , Mark McLoughlin , Alexander van Heukelum In-Reply-To: <20080228094613.GC2987@elte.hu> References: <1204187174-27143-1-git-send-email-ijc@hellion.org.uk> <1204187174-27143-2-git-send-email-ijc@hellion.org.uk> <1204191082.5446.13.camel@zakaz.uk.xensource.com> <20080228094613.GC2987@elte.hu> Content-Type: text/plain Date: Thu, 28 Feb 2008 10:35:23 +0000 Message-Id: <1204194923.5446.30.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 X-Mailer: Evolution 2.12.3 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 217.46.209.99 X-SA-Exim-Mail-From: ijc@hellion.org.uk Subject: Re: [PATCH 2/2] x86/xen: Disable DMI parsing in Xen kernel. X-SA-Exim-Version: 4.2.1 (built Tue, 09 Jan 2007 17:23:22 +0000) X-SA-Exim-Scanned: Yes (on hopkins.hellion.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2008-02-28 at 10:46 +0100, Ingo Molnar wrote: > * Ian Campbell wrote: > > > Actually scratch this patchset -- its not sufficient. For example > > ddcprobe in userspace causes the exact same issue vs 0xa0000. > > > > Looks like the only sane solution will be to mark regions between > > 640K-1M reserved early on in boot. > > and as luck has it, such a patch from Alexander van Heukelum has been > put into x86.git#testing just yesterday. > > So ... could you try x86.git#testing - does it work out of box? Is the > reservation early enough to prevent pagetables be allocated in weird > places? That patch is 64 bit only and also I'm not sure what EBDA looks like to a Xen domU (I expect it doesn't exist). I'll give it a go but I'm not hopeful. > [or am i missing something - this is about the guest kernel > reserving th 640k..1M area, not the host kernel - right?] Correct, the area between 640k and 1M is just normal memory for a Xen guest and the memory map reflects that so page tables and other stuff get allocated in regions which would be magic data structures on native. Ian. -- Ian Campbell The woman you buy -- and she is the least expensive -- takes a great deal of money. The woman who gives herself takes all your time. -- Balzac