linux-kernel - Re: [PATCH v7 6/9] x86/boot: Move mem_encrypt= parsing to the decompressor

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Message-ID: <20240302145103.GBZeM81zHoBy922BhE@fat_crate.local>
Date: Sat, 2 Mar 2024 15:51:03 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ard Biesheuvel <ardb@...nel.org>
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>, Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH v7 6/9] x86/boot: Move mem_encrypt= parsing to the
 decompressor

On Sat, Mar 02, 2024 at 12:46:06AM +0100, Ard Biesheuvel wrote:
> Yeah that seems unnecessary to me. They are only used by kexec, and
> only for cases where you want to kexec a [much] older kernel that
> cannot deal with 5-level paging at all. AFAICT 5-level support was
> added in v4.13.

Yeah, I can't imagine a use case where you'd do two different kernels
- one for normal boot and one for kexec and they'd differ in the .config
and one would support 5level pagetables and the other wouldn't...

> So I think we might be able to drop these entirely, no?

Yeah:

https://lore.kernel.org/r/20240301185618.19663-1-bp@alien8.de


-- 
Regards/Gruss,
    Boris.

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