linux-kernel - [PATCH 0/3] arm64: cpufeature: Add filter function to control

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Message-Id: <1610152163-16554-1-git-send-email-sramana@codeaurora.org>
Date:   Fri,  8 Jan 2021 16:29:20 -0800
From:   Srinivas Ramana <sramana@...eaurora.org>
To:     catalin.marinas@....com, will@...nel.org, pajay@....qualcomm.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Srinivas Ramana <sramana@...eaurora.org>
Subject: [PATCH 0/3] arm64: cpufeature: Add filter function to control

This patchset adds a control function for cpufeature framework
so that the feature can be controlled at runtime.

Defer PAC on boot core and use the filter function added to disable
PAC from command line. This will help toggling the feature on systems
that do not support PAC or where PAC needs to be disabled at runtime,
without modifying the core kernel.

The idea of adding the filter function for cpufeature is taken from
https://lore.kernel.org/linux-arm-kernel/20200515171612.1020-25-catalin.marinas@arm.com/
https://lore.kernel.org/linux-arm-kernel/20200515171612.1020-24-catalin.marinas@arm.com/

Srinivas Ramana (3):
  arm64: Defer enabling pointer authentication on boot core
  arm64: cpufeature: Add a filter function to cpufeature
  arm64: Enable control of pointer authentication using early param

 Documentation/admin-guide/kernel-parameters.txt |  6 +++
 arch/arm64/include/asm/cpufeature.h             |  8 +++-
 arch/arm64/include/asm/pointer_auth.h           | 10 +++++
 arch/arm64/include/asm/stackprotector.h         |  1 +
 arch/arm64/kernel/cpufeature.c                  | 53 +++++++++++++++++++------
 arch/arm64/kernel/head.S                        |  4 --
 6 files changed, 64 insertions(+), 18 deletions(-)

-- 
2.7.4