linux-kernel - Re: [PATCH v8 08/26] arm64: Make PMR part of task context

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Date:   Fri, 18 Jan 2019 16:10:37 +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,
        Oleg Nesterov <oleg@...hat.com>, joel@...lfernandes.org,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v8 08/26] arm64: Make PMR part of task context

On Tue, Jan 08, 2019 at 02:07:26PM +0000, Julien Thierry wrote:
> In order to replace PSR.I interrupt disabling/enabling with ICC_PMR_EL1
> interrupt masking, ICC_PMR_EL1 needs to be saved/restored when
> taking/returning from an exception. This mimics the way hardware saves
> and restores PSR.I bit in spsr_el1 for exceptions and ERET.
> 
> Add PMR to the registers to save in the pt_regs struct upon kernel entry,
> and restore it before ERET. Also, initialize it to a sane value when
> creating new tasks.
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Dave Martin <Dave.Martin@....com>

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