linux-kernel - Re: [PATCH v8 13/26] arm64: daifflags: Include PMR in daifflags restore operations

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Date:   Fri, 18 Jan 2019 16:43:31 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
        daniel.thompson@...aro.org, marc.zyngier@....com,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        christoffer.dall@....com, james.morse@....com,
        joel@...lfernandes.org
Subject: Re: [PATCH v8 13/26] arm64: daifflags: Include PMR in daifflags
 restore operations

On Tue, Jan 08, 2019 at 02:07:31PM +0000, Julien Thierry wrote:
> The addition of PMR should not bypass the semantics of daifflags.
> 
> When DA_F are set, I bit is also set as no interrupts (even of higher
> priority) is allowed.
> 
> When DA_F are cleared, I bit is cleared and interrupt enabling/disabling
> goes through ICC_PMR_EL1.
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: James Morse <james.morse@....com>

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