linux-kernel - Re: [PATCH v5 05/27] arm64: Use daifflag_restore after bp

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Message-ID: <20181003151240.GE12998@arrakis.emea.arm.com>
Date:   Wed, 3 Oct 2018 16:12:41 +0100
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 v5 05/27] arm64: Use daifflag_restore after bp_hardening

On Tue, Aug 28, 2018 at 04:51:15PM +0100, Julien Thierry wrote:
> For EL0 entries requiring bp_hardening, daif status is kept at
> DAIF_PROCCTX_NOIRQ until after hardening has been done. Then interrupts
> are enabled through local_irq_enable().
> 
> Before using local_irq_* functions, daifflags should be properly restored
> to a state where IRQs are enabled.
> 
> Enable IRQs by restoring DAIF_PROCCTX state after bp hardening.
> 
> Signed-off-by: Julien Thierry <julien.thierry@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: James Morse <james.morse@....com>

Queued for 4.20. Thanks.

-- 
Catalin