linux-kernel - Re: [PATCHv7 05/14] x86/boot/efi: Define __KERNEL32

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Date:   Thu, 8 Jun 2017 15:18:42 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv7 05/14] x86/boot/efi: Define __KERNEL32_CS GDT on 64-bit
 configurations

On Tue, 06 Jun, at 02:31:24PM, Kirill A. Shutemov wrote:
> We would need to switch temporarily to compatibility mode during booting
> with 5-level paging enabled. It would require 32-bit code segment
> descriptor.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Matt Fleming <matt@...eblueprint.co.uk>
> ---
>  arch/x86/boot/compressed/eboot.c | 25 +++++++++++++++++++++++--
>  1 file changed, 23 insertions(+), 2 deletions(-)

Reviewed-by: Matt Fleming <matt@...eblueprint.co.uk>