linux-kernel - Re: [PATCH v6 06/13] arm64/cpufeature: detect pointer authentication

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Date:   Sun, 9 Dec 2018 08:58:06 -0600
From:   Richard Henderson <richard.henderson@...aro.org>
To:     Kristina Martsenko <kristina.martsenko@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Adam Wallis <awallis@...eaurora.org>,
        Amit Kachhap <amit.kachhap@....com>,
        Andrew Jones <drjones@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave P Martin <dave.martin@....com>,
        Jacob Bramley <jacob.bramley@....com>,
        Kees Cook <keescook@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ramana Radhakrishnan <ramana.radhakrishnan@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will.deacon@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 06/13] arm64/cpufeature: detect pointer authentication

On 12/7/18 12:39 PM, Kristina Martsenko wrote:
> From: Mark Rutland <mark.rutland@....com>
> 
> So that we can dynamically handle the presence of pointer authentication
> functionality, wire up probing code in cpufeature.c.
> 
> From ARMv8.3 onwards, ID_AA64ISAR1 is no longer entirely RES0, and now
> has four fields describing the presence of pointer authentication
> functionality:
> 
> * APA - address authentication present, using an architected algorithm
> * API - address authentication present, using an IMP DEF algorithm
> * GPA - generic authentication present, using an architected algorithm
> * GPI - generic authentication present, using an IMP DEF algorithm
> 
> This patch checks for both address and generic authentication,
> separately. It is assumed that if all CPUs support an IMP DEF algorithm,
> the same algorithm is used across all CPUs.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  arch/arm64/include/asm/cpucaps.h    |  8 +++-
>  arch/arm64/include/asm/cpufeature.h | 12 +++++
>  arch/arm64/kernel/cpufeature.c      | 90 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 109 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@...aro.org>


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