Re: [PATCH v7 12/22] x86/decompressor: Call trampoline directly from C code

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To: Ard Biesheuvel <ardb@xxxxxxxxxx>
Subject: Re: [PATCH v7 12/22] x86/decompressor: Call trampoline directly from C code
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Tue, 1 Aug 2023 13:51:54 +0200
Cc: linux-efi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Evgeniy Baskov <baskov@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>, Joerg Roedel <jroedel@xxxxxxx>
In-reply-to: <CAMj1kXEyApdRYNmn7Px=faANXv6JXXTAvdPUToy3-H1UZg6-eQ@mail.gmail.com>
References: <20230728090916.1538550-1-ardb@kernel.org> <20230728090916.1538550-13-ardb@kernel.org> <20230801114542.GEZMjwZne986ZxI6eG@fat_crate.local> <CAMj1kXEyApdRYNmn7Px=faANXv6JXXTAvdPUToy3-H1UZg6-eQ@mail.gmail.com>

On Tue, Aug 01, 2023 at 01:48:52PM +0200, Ard Biesheuvel wrote:
> configure_5level_paging()? At least, that conveys to some extent that
> nothing will happen unless the hardware supports it to begin with.

Yap, and it says what it does exactly.

Thx.

-- 
Regards/Gruss,
    Boris.

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

References:
- [PATCH v7 00/22] efi/x86: Avoid bare metal decompressor during EFI boot
  - From: Ard Biesheuvel
- [PATCH v7 12/22] x86/decompressor: Call trampoline directly from C code
  - From: Ard Biesheuvel
- Re: [PATCH v7 12/22] x86/decompressor: Call trampoline directly from C code
  - From: Borislav Petkov
- Re: [PATCH v7 12/22] x86/decompressor: Call trampoline directly from C code
  - From: Ard Biesheuvel

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