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

From: Marc Zyngier
Date: Mon Jan 28 2019 - 04:42:28 EST

On Mon, 21 Jan 2019 15:33:27 +0000,
Julien Thierry <julien.thierry@xxxxxxx> 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@xxxxxxx>
> Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will.deacon@xxxxxxx>
> Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
> Cc: Dave Martin <Dave.Martin@xxxxxxx>

Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>


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