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SubjectRe: [PATCH 1/2] x86/mm: Give each mm a unique ID
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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

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