linux-kernel - Re: [PATCH 18/43] x86/entry/64: Move the IST stacks into cpu_entry

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Date:   Sat, 25 Nov 2017 13:34:19 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 18/43] x86/entry/64: Move the IST stacks into
 cpu_entry_area

On Fri, Nov 24, 2017 at 06:23:46PM +0100, Ingo Molnar wrote:
> From: Andy Lutomirski <luto@...nel.org>
> 
> The IST stacks are needed when an IST exception occurs and are
> accessed before any kernel code at all runs.  Move them into
> cpu_entry_area.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Borislav Petkov <bpetkov@...e.de>
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Link: https://lkml.kernel.org/r/0ffddccdc0ce1953f950a553142662cf68258fb7.1511497875.git.luto@kernel.org
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> ---
>  arch/x86/include/asm/fixmap.h | 10 ++++++++++
>  arch/x86/kernel/cpu/common.c  | 40 +++++++++++++++++++++++++---------------
>  2 files changed, 35 insertions(+), 15 deletions(-)

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

-- 
Regards/Gruss,
    Boris.

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