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Subject: Re: [PATCH 1/2] x86/mm: Give each mm a unique ID
From:   Tim Chen <tim.c.chen@linux.intel.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     stable@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
        Nadav Amit <nadav.amit@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Rik van Riel <riel@redhat.com>,
        Ingo Molnar <mingo@kernel.org>,
        David Woodhouse <dwmw@amazon.co.uk>, ak@linux.intel.com,
        karahmed@amazon.de, pbonzini@redhat.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
References: <cover.1520026221.git.tim.c.chen@linux.intel.com>
 <3351ba53a3b570ba08f2a0f5a59d01b7d80a8955.1520026221.git.tim.c.chen@linux.intel.com>
 <20180307173036.GJ7097@kroah.com>
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Message-ID: <8322b21f-5ee7-41a6-7897-d73faa0ece27@linux.intel.com>
Date:   Fri, 9 Mar 2018 17:04:39 -0800
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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 <luto@kernel.org>
>>> 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 <luto@kernel.org>
>>> Reviewed-by: Nadav Amit <nadav.amit@gmail.com>
>>> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
>>> Cc: Andrew Morton <akpm@linux-foundation.org>
>>> Cc: Arjan van de Ven <arjan@linux.intel.com>
>>> Cc: Borislav Petkov <bp@alien8.de>
>>> Cc: Dave Hansen <dave.hansen@intel.com>
>>> Cc: Linus Torvalds <torvalds@linux-foundation.org>
>>> Cc: Mel Gorman <mgorman@suse.de>
>>> Cc: Peter Zijlstra <peterz@infradead.org>
>>> Cc: Rik van Riel <riel@redhat.com>
>>> Cc: linux-mm@kvack.org
>>> Link: http://lkml.kernel.org/r/413a91c24dab3ed0caa5f4e4d017d87b0857f920.1498751203.git.luto@kernel.org
>>> Signed-off-by: Ingo Molnar <mingo@kernel.org>
>>> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
>>> ---
>>>  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