Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755458AbXIPDSw (ORCPT ); Sat, 15 Sep 2007 23:18:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754637AbXIPDSp (ORCPT ); Sat, 15 Sep 2007 23:18:45 -0400 Received: from one.firstfloor.org ([213.235.205.2]:57735 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754638AbXIPDSo (ORCPT ); Sat, 15 Sep 2007 23:18:44 -0400 Date: Sun, 16 Sep 2007 05:18:43 +0200 From: Andi Kleen To: "H. Peter Anvin" Cc: Yinghai Lu , Andi Kleen , Greg KH , Andrew Morton , Jeff Garzik , Martin Mares , dean gaudet , Robert Richter , Linux Kernel Mailing List Subject: Re: [PATCH] x86_64: set cfg_size for AMD Family 10h in case MMCONFIG is used Message-ID: <20070916031843.GE14501@one.firstfloor.org> References: <200709121921.43950.yinghai.lu@sun.com> <200709131147.43446.ak@suse.de> <20070913104704.GA3878@kroah.com> <200709131353.15752.ak@suse.de> <86802c440709131001w4b758921r52a23f1732a6e9c8@mail.gmail.com> <46E97178.2040903@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <46E97178.2040903@zytor.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 940 Lines: 23 On Thu, Sep 13, 2007 at 10:20:56AM -0700, H. Peter Anvin wrote: > Yinghai Lu wrote: > > > > BIOS guys also said that fam 10h need mmconfig via eax accessing, may > > need OS do sth, so it is safe to stay with MCFG entry for SB like > > mcp55... > > > > but latest kernel already have that workaround to make mmconfig via eax... > > > > This is actually a good point. Since the CPU vendor managed to > completely fuck up the operation of MMCONFIG itself on this CPU (it's a > *MEMORY REFERENCE*, guys!), it is actually to be expected and prudent It's quite possible that Windows MCFG code always ends up using EAX. In fact many older Linux kernels ended up doing this by chance too. -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/