linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7180: Drop the unused non-MSA SID

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Date:   Wed, 8 Jul 2020 10:59:20 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Sibi Sankar <sibis@...eaurora.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, "# 4.0+" <stable@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc7180: Drop the unused non-MSA SID

Hi,

On Tue, Jun 30, 2020 at 1:20 AM Sibi Sankar <sibis@...eaurora.org> wrote:
>
> Having a non-MSA (Modem Self-Authentication) SID bypassed breaks modem
> sandboxing i.e if a transaction were to originate from it, the hardware
> memory protections units (XPUs) would fail to flag them (any transaction
> originating from modem are historically termed as an MSA transaction).
> Drop the unused non-MSA modem SID on SC7180 SoCs and cheza so that SMMU
> continues to block them.
>
> Fixes: bec71ba243e95 ("arm64: dts: qcom: sc7180: Update Q6V5 MSS node")
> Fixes: 68aee4af5f620 ("arm64: dts: qcom: sdm845-cheza: Add iommus property")
> Cc: stable@...r.kernel.org
> Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7180-idp.dts    | 2 +-
>  arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

I'm not sure if my review is worth all that much since it's not my
area of expertise, but as far as I can tell this is good / ready to go
in.  I've confirmed that a similar on my sc7180 board doesn't seem to
break anything for me so restricting things like this seems sane.

Reviewed-by: Douglas Anderson <dianders@...omium.org>
Tested-by: Douglas Anderson <dianders@...omium.org>

-Doug