From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id 613786B0007 for ; Fri, 9 Mar 2018 20:04:42 -0500 (EST) Received: by mail-pg0-f72.google.com with SMTP id l14so4593648pgn.21 for ; Fri, 09 Mar 2018 17:04:42 -0800 (PST) Received: from mga03.intel.com (mga03.intel.com. [134.134.136.65]) by mx.google.com with ESMTPS id o23-v6si1745557pll.433.2018.03.09.17.04.40 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Mar 2018 17:04:40 -0800 (PST) Subject: Re: [PATCH 1/2] x86/mm: Give each mm a unique ID From: Tim Chen References: <3351ba53a3b570ba08f2a0f5a59d01b7d80a8955.1520026221.git.tim.c.chen@linux.intel.com> <20180307173036.GJ7097@kroah.com> <9b0d1195-23bd-5bf9-0dd8-b2ca29165bbb@linux.intel.com> Message-ID: <8322b21f-5ee7-41a6-7897-d73faa0ece27@linux.intel.com> Date: Fri, 9 Mar 2018 17:04:39 -0800 MIME-Version: 1.0 In-Reply-To: <9b0d1195-23bd-5bf9-0dd8-b2ca29165bbb@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Greg Kroah-Hartman Cc: stable@vger.kernel.org, Andy Lutomirski , Nadav Amit , Thomas Gleixner , Andrew Morton , Arjan van de Ven , Borislav Petkov , Dave Hansen , Linus Torvalds , Mel Gorman , Peter Zijlstra , Rik van Riel , Ingo Molnar , David Woodhouse , ak@linux.intel.com, karahmed@amazon.de, pbonzini@redhat.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org On 03/08/2018 10:23 AM, Tim Chen wrote: > On 03/07/2018 09:30 AM, Greg Kroah-Hartman wrote: >> On Fri, Mar 02, 2018 at 01:32:09PM -0800, Tim Chen wrote: >>> From: Andy Lutomirski >>> commit: f39681ed0f48498b80455095376f11535feea332 >>> >>> This adds a new variable to mmu_context_t: ctx_id. >>> ctx_id uniquely identifies the mm_struct and will never be reused. >>> >>> Signed-off-by: Andy Lutomirski >>> Reviewed-by: Nadav Amit >>> Reviewed-by: Thomas Gleixner >>> Cc: Andrew Morton >>> Cc: Arjan van de Ven >>> Cc: Borislav Petkov >>> Cc: Dave Hansen >>> Cc: Linus Torvalds >>> Cc: Mel Gorman >>> Cc: Peter Zijlstra >>> Cc: Rik van Riel >>> Cc: linux-mm@kvack.org >>> Link: http://lkml.kernel.org/r/413a91c24dab3ed0caa5f4e4d017d87b0857f920.1498751203.git.luto@kernel.org >>> Signed-off-by: Ingo Molnar >>> Signed-off-by: Tim Chen >>> --- >>> arch/x86/include/asm/mmu.h | 15 +++++++++++++-- >>> arch/x86/include/asm/mmu_context.h | 5 +++++ >>> arch/x86/mm/tlb.c | 2 ++ >>> 3 files changed, 20 insertions(+), 2 deletions(-) >>> >> >> Does not apply to 4.4.y :( >> >> Can you provide a working backport for that tree? >> > > Okay. Will do. Thanks. > Greg, I actually found that there are a number of dependent IBPB related patches that haven't been backported yet to 4.4: x86/cpufeatures: Add AMD feature bits for Speculation Control (cherry picked from commit 5d10cbc91d9eb5537998b65608441b592eec65e7) x86/msr: Add definitions for new speculation control MSRs (cherry picked from commit 1e340c60d0dd3ae07b5bedc16a0469c14b9f3410) x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support (cherry picked from commit 20ffa1caecca4db8f79fe665acdeaa5af815a24d) x86/cpufeatures: Clean up Spectre v2 related CPUID flags (cherry picked from commit 2961298efe1ea1b6fc0d7ee8b76018fa6c0bcef2) And probably and a few more. You have plans to backport these patches? Tim