Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761678AbYAKVSG (ORCPT ); Fri, 11 Jan 2008 16:18:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759379AbYAKVRz (ORCPT ); Fri, 11 Jan 2008 16:17:55 -0500 Received: from palinux.external.hp.com ([192.25.206.14]:33621 "EHLO mail.parisc-linux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753922AbYAKVRz (ORCPT ); Fri, 11 Jan 2008 16:17:55 -0500 Date: Fri, 11 Jan 2008 14:17:53 -0700 From: Matthew Wilcox To: Linus Torvalds Cc: Greg KH , Arjan van de Ven , Greg KH , linux-kernel@vger.kernel.org, Jeff Garzik , linux-pci@atrey.karlin.mff.cuni.cz, Benjamin Herrenschmidt , Martin Mares Subject: Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver opt-in Message-ID: <20080111211753.GR18741@parisc-linux.org> References: <20080111190229.GB10112@kroah.com> <20080111192820.GM18741@parisc-linux.org> <20080111114002.3e59d1ad@laptopd505.fenrus.org> <20080111194524.GA17170@suse.de> <20080111194931.GN18741@parisc-linux.org> <20080111201716.GO18741@parisc-linux.org> <20080111204228.GP18741@parisc-linux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1192 Lines: 29 On Fri, Jan 11, 2008 at 01:12:12PM -0800, Linus Torvalds wrote: > > > On Fri, 11 Jan 2008, Matthew Wilcox wrote: > > > > But they can't. We limit the size they can access to 256 bytes, unless > > the kernel probed address 256 and it worked. > > Umm. Probing address 256 (or *any* address) using MMCONFIG will simply > lock up the machine. HARD. Did I miss a bug report? The only problems I'm currently aware of are the ones where using MMCONFIG during BAR probing causes a hard lockup on some Intel machines, and the ones where we get bad config data on some AMD machines due to the configuration retry status being mishandled. All the other lockups I'm aware of are already handled by the existing checks. -- Intel are signing my paycheques ... these opinions are still mine "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- 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/