linux-kernel - Re: [PATCH v5 01/17] arm64: add pointer authentication register bits

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Message-ID: <20181011162814.GC17000@arm.com>
Date:   Thu, 11 Oct 2018 17:28:14 +0100
From:   Will Deacon <will.deacon@....com>
To:     Kristina Martsenko <kristina.martsenko@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Adam Wallis <awallis@...eaurora.org>,
        Amit Kachhap <Amit.Kachhap@....com>,
        Andrew Jones <drjones@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoffer Dall <christoffer.dall@....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>,
        kvmarm@...ts.cs.columbia.edu, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/17] arm64: add pointer authentication register bits

On Fri, Oct 05, 2018 at 09:47:38AM +0100, Kristina Martsenko wrote:
> From: Mark Rutland <mark.rutland@....com>
> 
> The ARMv8.3 pointer authentication extension adds:
> 
> * New fields in ID_AA64ISAR1 to report the presence of pointer
>   authentication functionality.
> 
> * New control bits in SCTLR_ELx to enable this functionality.
> 
> * New system registers to hold the keys necessary for this
>   functionality.
> 
> * A new ESR_ELx.EC code used when the new instructions are affected by
>   configurable traps
> 
> This patch adds the relevant definitions to <asm/sysreg.h> and
> <asm/esr.h> for these, to be used by subsequent patches.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  arch/arm64/include/asm/esr.h    |  3 ++-
>  arch/arm64/include/asm/sysreg.h | 30 ++++++++++++++++++++++++++++++
>  2 files changed, 32 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h
> index ce70c3ffb993..022785162281 100644
> --- a/arch/arm64/include/asm/esr.h
> +++ b/arch/arm64/include/asm/esr.h
> @@ -30,7 +30,8 @@
>  #define ESR_ELx_EC_CP14_LS	(0x06)
>  #define ESR_ELx_EC_FP_ASIMD	(0x07)
>  #define ESR_ELx_EC_CP10_ID	(0x08)
> -/* Unallocated EC: 0x09 - 0x0B */
> +#define ESR_ELx_EC_PAC		(0x09)

Really minor nit: but shouldn't this be ESR_EL2_EC_PAC, since this trap
can't occur at EL1 afaict?

Rest of the patch looks good:

Reviewed-by: Will Deacon <will.deacon@....com>

Will