linux-kernel - Re: [PATCH v4 21/21] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line

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Message-ID: <YAwydxY68TULznr1@Catalins-MacBook-Air.local>
Date:   Sat, 23 Jan 2021 14:28:07 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 21/21] arm64: cpufeatures: Allow disabling of Pointer
 Auth from the command-line

On Mon, Jan 18, 2021 at 09:45:33AM +0000, Marc Zyngier wrote:
> In order to be able to disable Pointer Authentication  at runtime,
> whether it is for testing purposes, or to work around HW issues,
> let's add support for overriding the ID_AA64ISAR1_EL1.{GPI,GPA,API,APA}
> fields.
> 
> This is further mapped on the arm64.nopauth command-line alias.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>