linux-kernel - Re: [PATCH v9 03/26] arm64: cpufeature: Set SYSREG_GIC

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Date:   Mon, 28 Jan 2019 09:22:53 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <daniel.thompson@...aro.org>,
        <joel@...lfernandes.org>, <christoffer.dall@....com>,
        <james.morse@....com>, <catalin.marinas@....com>,
        <will.deacon@....com>, <mark.rutland@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v9 03/26] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature

On Mon, 21 Jan 2019 15:33:22 +0000,
Julien Thierry <julien.thierry@....com> wrote:
> 
> It is not supported to have some CPUs using GICv3 sysreg CPU interface
> while some others do not.
> 
> Once ICC_SRE_EL1.SRE is set on a CPU, the bit cannot be cleared. Since
> matching this feature require setting ICC_SRE_EL1.SRE, it cannot be
> turned off if found on a CPU.
> 
> Set the feature as STRICT_BOOT, if boot CPU has it, all other CPUs are
> required to have it.
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Suggested-by: Daniel Thompson <daniel.thompson@...aro.org>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Reviewed-by: Mark Rutland <mark.rutland@....com>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Marc Zyngier <marc.zyngier@....com>

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

	M.

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