linux-kernel - Re: [PATCH v3 8/9] arm64: cpufeature: Expose CPUID registers by emulation

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Message-ID: <20170105183906.GI29765@e104818-lin.cambridge.arm.com>
Date:   Thu, 5 Jan 2017 18:39:06 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
        ryan.arnold@...aro.org, sid@...erved-bit.com, aph@...hat.com,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        adhemerval.zanella@...aro.org, dave.martin@....com
Subject: Re: [PATCH v3 8/9] arm64: cpufeature: Expose CPUID registers by
 emulation

On Wed, Jan 04, 2017 at 05:49:06PM +0000, Suzuki K. Poulose wrote:
> This patch adds the hook for emulating MRS instruction to
> export the 'user visible' value of supported system registers.
> We emulate only the following id space for system registers:
> 
>  Op0=3, Op1=0, CRn=0, CRm=[0, 4-7]
> 
> The rest will fall back to SIGILL. This capability is also
> advertised via a new HWCAP_CPUID.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will.deacon@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

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