linux-kernel - Re: [PATCH v4 0/9] arm64: Expose CPUID registers via emulation

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Message-ID: <20170110171459.GH527@arm.com>
Date:   Tue, 10 Jan 2017 17:15:00 +0000
From:   Will Deacon <will.deacon@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com, mark.rutland@....com, dave.martin@....com,
        aph@...hat.com, ryan.arnold@...aro.org,
        adhemerval.zanella@...aro.org, sid@...erved-bit.com
Subject: Re: [PATCH v4 0/9] arm64: Expose CPUID registers via emulation

On Mon, Jan 09, 2017 at 05:28:23PM +0000, Suzuki K Poulose wrote:
> This series adds a new ABI to expose the CPU feature registers
> to the user space via emulation of MRS instruction. The system exposes
> only a limited set of feature values (See the documentation patch)
> from the cpufeature infrastructure. The feature bits that are not
> exposed are set to the 'safe value' which implies 'not supported'.
> 
> Apart from the selected feature registers, we expose MIDR_EL1 (Main
> ID Register). The user should be aware that, reading MIDR_EL1 can be
> tricky on a heterogeneous system (just like getcpu()). We export the
> value of the current CPU where 'MRS' is executed.
> 
> Applies on v4.10-rc3.

Thanks, I'll queue this for 4.11.

Will