linux-kernel - Re: [PATCH v3 09/19] x86/head64: Simplify GDT/IDT initialization code

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Message-ID: <20240212143717.GWZcotHRH-8a3x1gTH@fat_crate.local>
Date: Mon, 12 Feb 2024 15:37:17 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Kevin Loughlin <kevinloughlin@...gle.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Dionna Glaze <dionnaglaze@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Kees Cook <keescook@...omium.org>, Brian Gerst <brgerst@...il.com>,
	linux-arch@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v3 09/19] x86/head64: Simplify GDT/IDT initialization code

On Mon, Jan 29, 2024 at 07:05:12PM +0100, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@...nel.org>
> 
> There used to be two separate code paths for programming the IDT early:
> one that was called via the 1:1 mapping, and one via the kernel virtual
> mapping, where the former used explicit pointer fixups to obtain 1:1
> mapped addresses.
> 
> That distinction is now gone so the GDT/IDT init code can be unified and
> simplified accordingly.
> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  arch/x86/kernel/head64.c | 57 +++++++-------------
>  1 file changed, 18 insertions(+), 39 deletions(-)

Ok, I don't see anything wrong here and since this one is the last of
the cleanup, lemme stop here so that you can send a new revision. We can
deal with whether we want .pi.text later.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette