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

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Message-ID: <CAMj1kXGNnHzCWJB8RHYUqePRjN_k-8mRXKTM3B_Qq2je3k5iyQ@mail.gmail.com>
Date: Mon, 12 Feb 2024 16:23:53 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.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, 12 Feb 2024 at 15:37, Borislav Petkov <bp@...en8.de> wrote:
>
> 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.
>

OK.

I'll have the next rev out shortly, thanks.