From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Tim Chen <tim.c.chen@linux.intel.com>
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
Subject: Re: [PATCH 1/2] x86/mm: Give each mm a unique ID
Date: Fri, 9 Mar 2018 17:14:35 -0800 [thread overview]
Message-ID: <20180310011435.GA27284@kroah.com> (raw)
In-Reply-To: <8322b21f-5ee7-41a6-7897-d73faa0ece27@linux.intel.com>
On Fri, Mar 09, 2018 at 05:04:39PM -0800, Tim Chen wrote:
> 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?
I don't, but I think someone from Amazon was looking into it, but I
haven't heard from them in a few weeks. I'll gladly take patches if you
have them, or at the worse case, a list like above of the git commits
that are missing.
thanks,
greg k-h
next prev parent reply other threads:[~2018-03-10 1:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-02 21:32 [PATCH 0/2] Backport IBPB on context switch to non-dumpable process Tim Chen
2018-03-02 21:32 ` [PATCH 1/2] x86/mm: Give each mm a unique ID Tim Chen
2018-03-07 17:30 ` Greg Kroah-Hartman
2018-03-08 18:23 ` Tim Chen
2018-03-10 1:04 ` Tim Chen
2018-03-10 1:14 ` Greg Kroah-Hartman [this message]
2018-03-02 21:32 ` [PATCH 2/2] x86/speculation: Use Indirect Branch Prediction Barrier in context switch Tim Chen
2018-03-03 8:54 ` [PATCH 0/2] Backport IBPB on context switch to non-dumpable process Greg Kroah-Hartman
2018-03-03 11:37 ` Woodhouse, David
2018-03-07 17:32 ` Greg Kroah-Hartman
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