linux-kernel - Re: [PATCH 04/10] arm64: head.S: Enable EL1 (host) access to SPE when entered at EL2

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Message-ID: <8b3f5174-cbe4-c6cd-3179-fa4d32868b46@arm.com>
Date:   Wed, 1 Feb 2017 16:22:15 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     mark.rutland@....com, kim.phillips@....com, alex.bennee@...aro.org,
        christoffer.dall@...aro.org, tglx@...utronix.de,
        peterz@...radead.org, alexander.shishkin@...ux.intel.com,
        robh@...nel.org, suzuki.poulose@....com, pawel.moll@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/10] arm64: head.S: Enable EL1 (host) access to SPE when
 entered at EL2

On 27/01/17 18:07, Will Deacon wrote:
> The SPE architecture requires each exception level to enable access
> to the SPE controls for the exception level below it, since additional
> context-switch logic may be required to handle the buffer safely.
> 
> This patch allows EL1 (host) access to the SPE controls when entered at
> EL2.
> 
> Cc: Marc Zyngier <marc.zyngier@....com>
> Signed-off-by: Will Deacon <will.deacon@....com>

Definitely more readable than the initial version! ;-)

Acked-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...