From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753445Ab3JLUgv (ORCPT ); Sat, 12 Oct 2013 16:36:51 -0400 Received: from terminus.zytor.com ([198.137.202.10]:38776 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752770Ab3JLUgv (ORCPT ); Sat, 12 Oct 2013 16:36:51 -0400 Message-ID: <5259B29E.6000003@zytor.com> Date: Sat, 12 Oct 2013 13:35:42 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: Linus Torvalds , Matthew Garrett CC: Ingo Molnar , Avi Kivity , Len Brown , Linux Kernel Mailing List , Thomas Gleixner , Andrew Morton Subject: Re: [GIT PULL] x86 fixes References: <20131012171553.GA17548@gmail.com> <820c2fd2311341ce8a9b59e621c3fd1f@BY2PR05MB222.namprd05.prod.outlook.com> In-Reply-To: X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/12/2013 12:41 PM, Linus Torvalds wrote: > On Sat, Oct 12, 2013 at 12:28 PM, Matthew Garrett > wrote: >> >> The most likely cause of the problem that we're seeing here is that we're leaving the hardware in a state that isn't compatible with assumptions made by Dell's SMM code. We've certainly seen that some previous Dell machines have made incorrect assumptions about VT-d, which probably means that we should be destroying that state before reboot. David Woodhouse had been looking into that - I don't know whether we ever actually merged anything to do so. > > I have access to one of the affected Dell systems, so I'm willing to > try patches.. > The Dell machines definitely use some kind of SMM to reboot. -hpa