• Linus Torvalds's avatar
    Merge tag 'armsoc-tee' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · a2d9214c
    Linus Torvalds authored
    Pull TEE driver infrastructure and OP-TEE drivers from Arnd Bergmann:
     "This introduces a generic TEE framework in the kernel, to handle
      trusted environemtns (security coprocessor or software implementations
      such as OP-TEE/TrustZone). I'm sending it separately from the other
      arm-soc driver changes to give it a little more visibility, once the
      subsystem is merged, we will likely keep this in the arm₋soc drivers
      branch or have the maintainers submit pull requests directly,
      depending on the patch volume.
      I have reviewed earlier versions in the past, and have reviewed the
      latest version in person during Linaro Connect BUD17.
      Here is my overall assessment of the subsystem:
       - There is clearly demand for this, both for the generic
         infrastructure and the specific OP-TEE implementation.
       - The code has gone through a large number of reviews, and the review
         comments have all been addressed, but the reviews were not coming
         up with serious issues any more and nobody volunteered to vouch for
         the quality.
       - The user space ioctl interface is sufficient to work with the
         OP-TEE driver, and it should in principle work with other TEE
         implementations that follow the GlobalPlatform[1] standards, but it
         might need to be extended in minor ways depending on specific
         requirements of future TEE implementations
       - The main downside of the API to me is how the user space is tied to
         the TEE implementation in hardware or firmware, but uses a generic
         way to communicate with it. This seems to be an inherent problem
         with what it is trying to do, and I could not come up with any
         better solution than what is implemented here.
      For a detailed history of the patch series, see
    * tag 'armsoc-tee' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
      arm64: dt: hikey: Add optee node
      Documentation: tee subsystem and op-tee driver
      tee: add OP-TEE driver
      tee: generic TEE subsystem
      dt/bindings: add bindings for optee
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