linux-kernel - Re: [PATCH v2 04/18] x86/gdt: Put per-cpu GDT remaps in ascending order

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Date:   Wed, 22 Nov 2017 12:05:56 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v2 04/18] x86/gdt: Put per-cpu GDT remaps in ascending
 order

On Tue, Nov 21, 2017 at 08:43:59PM -0800, Andy Lutomirski wrote:
> We currently have CPU 0's GDT at the top of the GDT range and
> higher-numbered CPUs at lower addreses.  This happens because the
> fixmap is upside down (index 0 is the top of the fixmap).
> 
> Flip it so that GDTs are in ascending order by virtual address.
> This will simplify a future patch that will generalize the GDT
> remap to contain multiple pages.
> 
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  arch/x86/include/asm/desc.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Same reply as before:

https://lkml.kernel.org/r/20171121171643.jtwbfuvxwi6wecj3@pd.tnic

-- 
Regards/Gruss,
    Boris.

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