linux-kernel - [PATCH V3 00/10] Fix XPU violation during modem metadata authentication

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Date:   Wed, 11 Jan 2023 17:13:27 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <manivannan.sadhasivam@...aro.org>
CC:     <agross@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <robh+dt@...nel.org>, <konrad.dybcio@...ainline.org>,
        <amit.pundir@...aro.org>, <regressions@...mhuis.info>,
        <sumit.semwal@...aro.org>, <will@...nel.org>,
        <catalin.marinas@....com>, <robin.murphy@....com>,
        Sibi Sankar <quic_sibis@...cinc.com>
Subject: [PATCH V3 00/10] Fix XPU violation during modem metadata authentication

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.

V3:
 * remove double space [Krzysztof]
 * Pickup R-bs
 * yaml description rewrite [Krzysztof]
 * fix compatible property [Krzysztof]
 * add blank lines and additionalProperties: false to mba/mpss
   objects
 * add blank lines and additionalProperties: false to mdata
   objects [Krzysztof]
 * Drop revert no_kernel_mapping since it's already on the list [Mani]
 * kfree metadata from the branch for parity

V2:
 * Convert legacy bindings to yaml
 * Revert no_kernel_mapping [Mani/Robin]
 * Pad commit message to explain bindings break [Krzysztof]
 * Split dt/bindings per SoC [Krzysztof] 

Depends on:
[revert no_kernel_mapping]: https://lore.kernel.org/linux-arm-msm/20221223092703.61927-2-hch@lst.de/

Sibi Sankar (10):
  dt-bindings: remoteproc: qcom,q6v5: Move MSM8996 to schema
  dt-bindings: remoteproc: qcom,msm8996-mss-pil: Update memory region
  dt-bindings: remoteproc: qcom,sc7180-mss-pil: Update memory-region
  dt-bindings: remoteproc: qcom,sc7280-mss-pil: Update memory-region
  remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem
    headers
  arm64: dts: qcom: msm8996: Add a carveout for modem metadata
  arm64: dts: qcom: msm8998: Add a carveout for modem metadata
  arm64: dts: qcom: sdm845: Add a carveout for modem metadata
  arm64: dts: qcom: sc7180: Add a carveout for modem metadata
  arm64: dts: qcom: sc7280: Add a carveout for modem metadata

 .../remoteproc/qcom,msm8996-mss-pil.yaml      | 393 ++++++++++++++++++
 .../bindings/remoteproc/qcom,q6v5.txt         | 137 +-----
 .../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            |  48 ++-
 12 files changed, 495 insertions(+), 143 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml

-- 
2.17.1