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Fri, 9 Mar 2018 20:04:41 -0500 Received: from mga18.intel.com ([134.134.136.126]:51841 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932666AbeCJBEk (ORCPT ); Fri, 9 Mar 2018 20:04:40 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.47,448,1515484800"; d="scan'208";a="23980107" Subject: Re: [PATCH 1/2] x86/mm: Give each mm a unique ID From: Tim Chen 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 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 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 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: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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