linux-kernel - Re: [PATCH 1/6] x86/head_64: clean up mixed mode 32-bit entry code

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Message-ID: <YyoSKYQFDiqcqXWA@zn.tnic>
Date:   Tue, 20 Sep 2022 21:19:05 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Michael Roth <michael.roth@....com>
Subject: Re: [PATCH 1/6] x86/head_64: clean up mixed mode 32-bit entry code

On Mon, Aug 15, 2022 at 03:42:18PM +0200, Ard Biesheuvel wrote:
> The x86_64 32-bit entry code is a jumble of EFI and SEV routines, which
> is not good for maintainability. Let's isolate the EFI mixed mode code
> and combine it with the boot service thunk that lives in another .S
> file, so that we can remove it from head_64.S

Who is "we"?

Please use passive voice in all text.

> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  arch/x86/boot/compressed/Makefile       |   6 +-
>  arch/x86/boot/compressed/efi_mixed.S    | 358 ++++++++++++++++++++
>  arch/x86/boot/compressed/efi_thunk_64.S | 195 -----------
>  arch/x86/boot/compressed/head_32.S      |   4 -
>  arch/x86/boot/compressed/head_64.S      | 149 +-------
>  drivers/firmware/efi/libstub/x86-stub.c |   3 +-
>  6 files changed, 370 insertions(+), 345 deletions(-)

So I'm really nervous about patches touching early asm code where
multiple things happen all at once instead of each logical change being
split into a single patch: here I see code movement but then other
functionality is being added too.

So I'd really appreciate it if you split this one into smaller, obvious,
even boring patches - this will simplify review considerably. For
example, do only a mechanical code movement in one patch and then add
the new startup_64_mixedmode thing in another. And so on.

That would be greatly appreciated.

Thx.

-- 
Regards/Gruss,
    Boris.

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