linux-kernel - Re: [PATCH 03/16] x86/gdt: Put per-cpu GDT remaps in ascending order

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Message-ID: <alpine.DEB.2.20.1711202256360.2348@nanos>
Date:   Mon, 20 Nov 2017 22:56:46 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
cc:     X86 ML <x86@...nel.org>, Borislav Petkov <bpetkov@...e.de>,
        "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 03/16] x86/gdt: Put per-cpu GDT remaps in ascending
 order

On Mon, 20 Nov 2017, 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.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>