linux-kernel - Re: [PATCH v2 05/11] x86: add CONFIG_X86_64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fdf8b753-f4ff-47ea-aec7-508ad72ce5b9@gmail.com>
Date: Tue, 10 Dec 2024 19:05:56 +0000
From: irecca.kun@...il.com
To: Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
 x86@...nel.org
Cc: Arnd Bergmann <arnd@...db.de>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Andy Shevchenko <andy@...nel.org>, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2 05/11] x86: add CONFIG_X86_64_NATIVE option

Hello.

On 12/10/24 14:49, Arnd Bergmann wrote:
> As a replacement for the obsole MK8/MPSC/MCORE2 configuration options,
> allow building a specialized kernel for the local CPU, which is useful
> for users building their own kernels, and does not require maintaining
> a list of possible CPU options.

That potentially introduces problems. Namely compilers could apply auto-vectorization, which currently breaks the kernel.
We probably need an additional patch like this: https://github.com/zen-kernel/zen-kernel/commit/95b7981ba2e5c86529de0e895c2d9e428aa3f7dc