linux-kernel - [PATCH 0/6] VERW based clean-up

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Message-Id: <20240924223140.1054918-1-daniel.sneddon@linux.intel.com>
Date: Tue, 24 Sep 2024 15:31:34 -0700
From: Daniel Sneddon <daniel.sneddon@...ux.intel.com>
To: Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org
Cc: hpa@...or.com,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	pawan.kumar.gupta@...ux.intel.com
Subject: [PATCH 0/6] VERW based clean-up

There are several mitigations that use the VERW instruction to
clean up internal CPU buffers.  Currently, each of these mitigations is
treated independently, but if VERW is needed for one of the
mitigations, it's on for all of them. This can lead to some confusion
if a user tries to disable one of the mitigations, but it is left
enabled for one of the others. The user would have to disable all 4
VERW based mitigations.  This series aims to make it easier for the
end user to disable VERW based mitigations by introducing a single
parameter to control all of them. This makes the individual parameters
redundant, so they are removed. It may be desirable to keep the old
individual parameters for the sake of backwards compatibility.

Daniel Sneddon (6):
  x86/bugs: Create single parameter for VERW based mitigations
  x86/bugs: Remove MDS command line
  x86/bugs: Remove TAA kernel parameter.
  x86/bugs: Remove MMIO kernel parameter
  x86/bugs: Remove RFDS kernel parameter.
  x86/bugs: Clean-up verw mitigations

 .../admin-guide/kernel-parameters.txt         | 143 +--------
 arch/x86/kernel/cpu/bugs.c                    | 287 +++++++-----------
 2 files changed, 118 insertions(+), 312 deletions(-)

-- 
2.25.1