linux-kernel - Re: [PATCH v9 08/26] arm64: Make PMR part of task context

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Message-ID: <86d0ohw22q.wl-marc.zyngier@arm.com>
Date:   Mon, 28 Jan 2019 09:42:21 +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>,
        Oleg Nesterov <oleg@...hat.com>,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v9 08/26] arm64: Make PMR part of task context

On Mon, 21 Jan 2019 15:33:27 +0000,
Julien Thierry <julien.thierry@....com> 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>
> Reviewed-by: Catalin Marinas <catalin.marinas@....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: Marc Zyngier <marc.zyngier@....com>

	M.

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