linux-kernel - Re: [RESEND PATCH V6 5/6] dmaengine: pl330: Make sure microcode is privileged

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Date:   Tue, 6 Dec 2016 10:31:15 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Sricharan R <sricharan@...eaurora.org>
Cc:     jcrouse@...eaurora.org, pdaly@...eaurora.org,
        jgebben@...eaurora.org, joro@...tes.org,
        linux-kernel@...r.kernel.org, pratikp@...eaurora.org,
        iommu@...ts.linux-foundation.org, robin.murphy@....com,
        tzeng@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
        will.deacon@....com, mitchelh@...eaurora.org
Subject: Re: [RESEND PATCH V6 5/6] dmaengine: pl330: Make sure microcode is
 privileged

On Fri, Dec 02, 2016 at 08:25:08PM +0530, Sricharan R wrote:
> From: Mitchel Humpherys <mitchelh@...eaurora.org>
> 
> The PL330 performs privileged instruction fetches.  This can result in
> SMMU permission faults on SMMUs that implement the ARMv8 VMSA, which
> specifies that mappings that are writeable at one execution level shall
> not be executable at any higher-privileged level.  Fix this by using the
> DMA_ATTR_PRIVILEGED attribute, which will ensure that the microcode
> IOMMU mapping is only accessible to the privileged level.

Acked-by: Vinod Koul <vinod.koul@...el.com>

-- 
~Vinod