From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f69.google.com (mail-pl0-f69.google.com [209.85.160.69]) by kanga.kvack.org (Postfix) with ESMTP id 4BECC6B0007 for ; Sun, 15 Jul 2018 07:26:10 -0400 (EDT) Received: by mail-pl0-f69.google.com with SMTP id y2-v6so13118318pll.16 for ; Sun, 15 Jul 2018 04:26:10 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id a7-v6si27023787plz.510.2018.07.15.04.26.09 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 15 Jul 2018 04:26:09 -0700 (PDT) Date: Sun, 15 Jul 2018 13:26:05 +0200 From: Greg KH Subject: Re: [RESEND] Spectre-v2 (IBPB/IBRS) and SSBD fixes for 4.4.y Message-ID: <20180715112605.GA31680@kroah.com> References: <153156030832.10043.13438231886571087086.stgit@srivatsa-ubuntu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <153156030832.10043.13438231886571087086.stgit@srivatsa-ubuntu> Sender: owner-linux-mm@kvack.org List-ID: To: "Srivatsa S. Bhat" Cc: stable@vger.kernel.org, Denys Vlasenko , Bo Gan , Konrad Rzeszutek Wilk , Borislav Petkov , Thomas Gleixner , Ricardo Neri , Tom Lendacky , ak@linux.intel.com, linux-tip-commits@vger.kernel.org, Jia Zhang , Josh Poimboeuf , xen-devel@lists.xenproject.org, =?utf-8?B?S3LEjW3DocWZ?= , Peter Zijlstra , Andy Lutomirski , Arnaldo Carvalho de Melo , Sherry Hurwitz , Kees Cook , linux-kernel@vger.kernel.org, Shuah Khan , Oleg Nesterov , torvalds@linux-foundation.org, dwmw@amazon.co.uk, karahmed@amazon.de, Borislav Petkov , dave.hansen@linux.intel.com, linux@dominikbrodowski.net, Quentin Casasnovas , Joerg Roedel , Alexander Shishkin , Kyle Huey , Will Drewry , Andrey Ryabinin , "H. Peter Anvin" , Brian Gerst , Kristen Carlson Accardi , Thomas Garnier , Andrew Morton , Joe Konno , kvm , Piotr Luc , boris.ostrovsky@oracle.com, Jan Beulich , arjan@linux.intel.com, Alexander Kuleshov , Juergen Gross , Ross Zwisler , =?iso-8859-1?Q?J=F6rg?= Otte , tim.c.chen@linux.intel.com, Alexander Sergeyev , Josh Triplett , gnomes@lxorguk.ukuu.org.uk, Tony Luck , Laura Abbott , dave.hansen@intel.com, Ingo Molnar , Mike Galbraith , Rik van Riel , "Kirill A. Shutemov" , Alexey Makhalov , Dave Hansen , ashok.raj@intel.com, Mel Gorman , =?iso-8859-1?Q?Micka=EBlSala=FCn?= , Fenghua Yu , "Matt Helsley (VMware)" , Vince Weaver , Prarit Bhargava , rostedt@goodmis.org, Dan Williams , Jim Mattson , Dave Young , linux-edac , Jon Masters , Jiri Kosina , Andy Lutomirski , Paolo Bonzini , Arnd Bergmann , linux-mm@kvack.org, Jiri Olsa , arjan.van.de.ven@intel.com, sironi@amazon.de, Frederic Weisbecker , Kyle Huey , Alexander Popov , Andy Shevchenko , Nadav Amit , Yazen Ghannam , Wanpeng Li , Stephane Eranian , David Woodhouse , srivatsab@vmware.com On Sat, Jul 14, 2018 at 02:25:43AM -0700, Srivatsa S. Bhat wrote: > Hi Greg, > > This patch series is a backport of the Spectre-v2 fixes (IBPB/IBRS) > and patches for the Speculative Store Bypass vulnerability to 4.4.y > (they apply cleanly on top of 4.4.140). > > I used 4.9.y as my reference when backporting to 4.4.y (as I thought > that would minimize the amount of fixing up necessary). Unfortunately > I had to skip the KVM fixes for these vulnerabilities, as the KVM > codebase is drastically different in 4.4 as compared to 4.9. (I tried > my best to backport them initially, but wasn't confident that they > were correct, so I decided to drop them from this series). > > You'll notice that the initial few patches in this series include > cleanups etc., that are non-critical to IBPB/IBRS/SSBD. Most of these > patches are aimed at getting the cpufeature.h vs cpufeatures.h split > into 4.4, since a lot of the subsequent patches update these headers. > On my first attempt to backport these patches to 4.4.y, I had actually > tried to do all the updates on the cpufeature.h file itself, but it > started getting very cumbersome, so I resorted to backporting the > cpufeature.h vs cpufeatures.h split and their dependencies as well. I > think apart from these initial patches, the rest of the patchset > doesn't have all that much noise. I've applied the "initial" patches to the 4.4-stable queue right now, as those were all just "housekeeping" stuff. I'll let others review the rest of the series this week and see if anyone objects before throwing them at the test-bots. Many thanks for doing all of this work. greg k-h