Re: [PATCH v2 04/20] x86: decompressor: Use standard calling convention for trampoline

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To: Ard Biesheuvel <ardb@xxxxxxxxxx>
Subject: Re: [PATCH v2 04/20] x86: decompressor: Use standard calling convention for trampoline
From: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Date: Mon, 15 May 2023 17:00:46 +0300
Cc: linux-efi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Evgeniy Baskov <baskov@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Alexey Khoroshilov <khoroshilov@xxxxxxxxx>, Peter Jones <pjones@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, Mario Limonciello <mario.limonciello@xxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Feedback-id: ie3994620:Fastmail
In-reply-to: <20230508070330.582131-5-ardb@kernel.org>
References: <20230508070330.582131-1-ardb@kernel.org> <20230508070330.582131-5-ardb@kernel.org>

On Mon, May 08, 2023 at 09:03:14AM +0200, Ard Biesheuvel wrote:
> Update the trampoline code so its arguments are passed via RDI and RSI,
> which matches the ordinary SysV calling convention for x86_64. This will
> allow us to call this code directly from C.
> 
> Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>

Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov

References:
- [PATCH v2 00/20] efi/x86: Avoid bare metal decompressor during EFI boot
  - From: Ard Biesheuvel
- [PATCH v2 04/20] x86: decompressor: Use standard calling convention for trampoline
  - From: Ard Biesheuvel

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