[V2,00/11] Fix XPU violation during modem metadata authentication

Message

Sibi Sankar Jan. 9, 2023, 3:48 a.m. UTC

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.

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] 

Sibi Sankar (11):
  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: revert "map/unmap metadata region
    before/after use"
  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      | 382 ++++++++++++++++++
 .../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            |  78 ++--
 12 files changed, 486 insertions(+), 171 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml