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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. Tested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Fixes:bec71ba243("arm64: dts: qcom: sc7180: Update Q6V5 MSS node") Fixes:68aee4af5f("arm64: dts: qcom: sdm845-cheza: Add iommus property") Cc: stable@vger.kernel.org Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Link: https://lore.kernel.org/r/20200630081938.8131-1-sibis@codeaurora.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.