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    Subject[PATCH 0/4] Fix XPU violation during modem metadata authentication
    Date
    The memory region allocated using dma_alloc_attr with no kernel mapping
    attribute set would still be a part of the linear kernel map. Any access
    to this region by the application processor after assigning it to the
    remote Q6 will result in a XPU violation. Fix this by replacing the
    dynamically allocated memory region with a no-map carveout and unmap the
    modem metadata memory region before passing control to the remote Q6.
    The addition of the carveout and memunmap is required only on SoCs that
    mandate memory protection before transferring control to Q6, hence the
    driver falls back to dynamic memory allocation in the absence of the
    modem metadata carveout.

    Relevant discussions on the mailing list:
    https://lore.kernel.org/lkml/20221114110329.68413-1-manivannan.sadhasivam@linaro.org/

    Depends on:
    https://patchwork.kernel.org/project/linux-arm-msm/cover/20221124184333.133911-1-krzysztof.kozlowski@linaro.org/

    Reported-by: Amit Pundir <amit.pundir@linaro.org>
    https://people.linaro.org/~amit.pundir/linaro-sid-developer-dragonboard-845c-569/6.1-rc4_defconfig
    Reproduced with ^^ defconfig SDM845 SoCs

    Sibi Sankar (4):
    arm64: dts: qcom: Introduce a carveout for modem metadata
    dt-bindings: remoteproc: qcom: sc7180: Update memory-region
    requirements
    dt-bindings: remoteproc: qcom: q6v5: Update memory region requirements
    remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem
    headers

    .../bindings/remoteproc/qcom,q6v5.txt | 29 ++++++-
    .../remoteproc/qcom,sc7180-mss-pil.yaml | 3 +-
    .../remoteproc/qcom,sc7280-mss-pil.yaml | 3 +-
    .../boot/dts/qcom/msm8996-xiaomi-common.dtsi | 6 ++
    arch/arm64/boot/dts/qcom/msm8996.dtsi | 9 ++
    arch/arm64/boot/dts/qcom/msm8998.dtsi | 9 ++
    arch/arm64/boot/dts/qcom/sc7180-idp.dts | 7 +-
    arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 7 +-
    .../dts/qcom/sc7280-herobrine-lte-sku.dtsi | 7 +-
    arch/arm64/boot/dts/qcom/sdm845.dtsi | 9 ++
    drivers/remoteproc/qcom_q6v5_mss.c | 85 +++++++++++++------
    11 files changed, 142 insertions(+), 32 deletions(-)

    --
    2.17.1

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