linux-kernel - Re: [patch 14/60] x86/entry: Remap the TSS into the CPU entry area

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Message-ID: <20171204182007.nup65ddwcb2zcyzi@pd.tnic>
Date:   Mon, 4 Dec 2017 19:20:07 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>, keescook@...gle.com,
        hughd@...gle.com, Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        Will Deacon <will.deacon@....com>, daniel.gruss@...k.tugraz.at,
        Ingo Molnar <mingo@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [patch 14/60] x86/entry: Remap the TSS into the CPU entry area

On Mon, Dec 04, 2017 at 03:07:20PM +0100, Thomas Gleixner wrote:
> From: Andy Lutomirski <luto@...nel.org>
> 
> This has a secondary purpose: it puts the entry stack into a region
> with a well-controlled layout.  A subsequent patch will take
> advantage of this to streamline the SYSCALL entry code to be able to
> find it more easily.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Denys Vlasenko <dvlasenk@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Link: https://lkml.kernel.org/r/cdcba7e1e82122461b3ca36bb3ef6713ba605e35.1511497875.git.luto@kernel.org
> 
> ---
>  arch/x86/entry/entry_32.S     |    6 ++++--
>  arch/x86/include/asm/fixmap.h |    7 +++++++
>  arch/x86/kernel/asm-offsets.c |    3 +++
>  arch/x86/kernel/cpu/common.c  |   41 +++++++++++++++++++++++++++++++++++------
>  arch/x86/kernel/dumpstack.c   |    3 ++-
>  arch/x86/kvm/vmx.c            |    2 +-
>  arch/x86/power/cpu.c          |   11 ++++++-----
>  7 files changed, 58 insertions(+), 15 deletions(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--