Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751953AbdDASFQ convert rfc822-to-8bit (ORCPT ); Sat, 1 Apr 2017 14:05:16 -0400 Received: from terminus.zytor.com ([65.50.211.136]:43075 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751791AbdDASFP (ORCPT ); Sat, 1 Apr 2017 14:05:15 -0400 From: "H. Peter Anvin" Message-Id: <201704011750.v31Ho5q2028383@mail.zytor.com> Date: Sat, 01 Apr 2017 10:49:56 -0700 User-Agent: K-9 Mail for Android In-Reply-To: <6ec5ae47-42a8-7ed8-ec25-97350de15b21@list.ru> References: <20170308003254.27833-1-ricardo.neri-calderon@linux.intel.com> <79ba0fff-4c01-2bfa-06cb-5cfc98dd710c@list.ru> <997ba581-ecfa-b773-a48e-85b92a439836@list.ru> <1489022122.131264.33.camel@ranerica-desktop> <63231222-5b42-c8c9-02f0-0afbe702d8b5@list.ru> <1489190396.131264.47.camel@ranerica-desktop> <6331deea-e9b0-fcfe-b75d-8100f37a615a@list.ru> <1490658399.2647.14.camel@ranerica-desktop> <1490762284.2647.24.camel@ranerica-desktop> <2a9c7bfd-e85c-2673-d3b5-906fe7dd8db4@list.ru> <1490850848.2647.28.camel@ranerica-desktop> <6ec5ae47-42a8-7ed8-ec25-97350de15b21@list.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Subject: Re: [v6 PATCH 00/21] x86: Enable User-Mode Instruction Prevention To: Stas Sergeev , Ricardo Neri CC: Andy Lutomirski , Ingo Molnar , Thomas Gleixner , Andy Lutomirski , Borislav Petkov , Peter Zijlstra , Andrew Morton , Brian Gerst , Chris Metcalf , Dave Hansen , Paolo Bonzini , Liang Z Li , Masami Hiramatsu , Huang Rui , Jiri Slaby , Jonathan Corbet , "Michael S. Tsirkin" , Paul Gortmaker , Vlastimil Babka , Chen Yucong , Alexandre Julliard , Fenghua Yu , "Ravi V. Shankar" , Shuah Khan , "linux-kernel@vger.kernel.org" , X86.ML@zytor.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1513 Lines: 32 ,linux-msdos@vger.kernel.org,wine-devel@winehq.org From: hpa@zytor.com Message-ID: <3FD12652-AA83-4D73-9914-BBA089E58FFA@zytor.com> On April 1, 2017 6:08:43 AM PDT, Stas Sergeev wrote: >30.03.2017 08:14, Ricardo Neri пишет: >>>>>>> You know the wine's >>>>>>> requirements now - they are very small. And >>>>>>> dosemu doesn't need anything at all but smsw. >>>>>>> And even smsw is very rare. >>>>>> But emulation is still needed for SMSW, right? >>>>> Likely so. >>>>> If you want, I can enable the logging of this command >>>>> and see if it is used by some of the DOS programs I have. >>>> It would be great if you could do that, if you don't mind. >>> OK, scheduled to the week-end. >>> I'll let you know. >> Thanks! >OK, done the testing. >It appears smsw is used in v86 by windows-3.1 and dos4gw >at the very least, and these are the "major" apps. So doing >without a fixup in v86 will not go unnoticed. Unfortunately >this also means that KVM-vm86 should be properly tested. >I have also found a weird program that does SGDT under >v86. This causes "ERROR: SGDT not implemented" under >dosemu, but the prog still works fine as it obviously does >not care about the results. This app can easily be broken >of course, if that makes any sense (likely not). Using SMSW to detect v86 mode is relatively common. pushf hides the VM flag, but SMSW is available, providing the v86 virtualization hole. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.