linux-kernel - [PATCH v3 0/2] x86/tsx: Improve handling of the tsx= kernel parameter

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-next>] [day] [month] [year] [list]

Message-ID: <cover.1761127696.git.ptesarik@suse.com>
Date: Wed, 22 Oct 2025 12:26:11 +0200
From: Petr Tesarik <ptesarik@...e.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	Petr Tesarik <ptesarik@...e.com>
Subject: [PATCH v3 0/2] x86/tsx: Improve handling of the tsx= kernel parameter

Parse the tsx= kernel parameter with early_param(), so it is not
reported as unknown.

As a side note, it was not necessary to defer the handling of
tsx=auto. Contrary to Pawan's claim, cpu_set_bug_bits() is called
from setup_arch() via early_cpu_init() and early_identify_cpu() before
parse_early_param(). But it is a nice cleanup, nevertheless, and I
learned something about parsing the command line. Cf. the NAK here:
https://lore.kernel.org/all/20251009185134.fb4evjrk76rwxv37@desk/

Changes from v2:
* compile-time initialization with the configured default
* defer tsx=auto handling to tsx_init()
* add more detail to the commit message

Changes from v1:
* make tsx_ctrl_state local to tsx.c
* use early_param() instead of core_param()

Petr Tesarik (2):
  x86/tsx: Make tsx_ctrl_state static
  x86/tsx: Get the tsx= command line parameter with early_param()

 arch/x86/kernel/cpu/cpu.h |  9 ------
 arch/x86/kernel/cpu/tsx.c | 59 ++++++++++++++++++++++-----------------
 2 files changed, 34 insertions(+), 34 deletions(-)

-- 
2.51.0