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Date:   Wed, 23 Feb 2022 15:28:35 +0000
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Mark Brown <broonie@kernel.org>
Cc:     Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Shuah Khan <skhan@linuxfoundation.org>,
        Shuah Khan <shuah@kernel.org>,
        Alan Hayward <alan.hayward@arm.com>,
        Luis Machado <luis.machado@arm.com>,
        Salil Akerkar <Salil.Akerkar@arm.com>,
        Basant Kumar Dwivedi <Basant.KumarDwivedi@arm.com>,
        Szabolcs Nagy <szabolcs.nagy@arm.com>,
        James Morse <james.morse@arm.com>,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v11 24/40] arm64/sme: Disable streaming mode and ZA when
 flushing CPU state
Message-ID: <YhZSo32WuURnQslQ@arm.com>
References: <20220207152109.197566-1-broonie@kernel.org>
 <20220207152109.197566-25-broonie@kernel.org>
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On Mon, Feb 07, 2022 at 03:20:53PM +0000, Mark Brown wrote:
> Both streaming mode and ZA may increase power consumption when they are
> enabled and streaming mode makes many FPSIMD and SVE instructions undefined
> which will cause problems for any kernel mode floating point so disable
> both when we flush the CPU state. This covers both kernel_neon_begin() and
> idle and after flushing the state a reload is always required anyway.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>

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