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50709576d8
Add a separate documentation directory for TEE subsystem since it is a standalone subsystem which already offers devices consumed by multiple different subsystem drivers. Split overall TEE subsystem documentation modularly where: - The userspace API has been moved to Documentation/userspace-api/tee.rst. - The driver API has been moved to Documentation/driver-api/tee.rst. - The first module covers the overview of TEE subsystem. - The further modules are dedicated to different TEE implementations like: - OP-TEE - AMD-TEE - and so on for future TEE implementation support. Acked-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Acked-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20231128072352.866859-1-sumit.garg@linaro.org
27 lines
1.0 KiB
Plaintext
27 lines
1.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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# OP-TEE Trusted Execution Environment Configuration
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config OPTEE
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tristate "OP-TEE"
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depends on HAVE_ARM_SMCCC
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depends on MMU
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help
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This implements the OP-TEE Trusted Execution Environment (TEE)
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driver.
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config OPTEE_INSECURE_LOAD_IMAGE
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bool "Load OP-TEE image as firmware"
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default n
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depends on OPTEE && ARM64
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help
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This loads the BL32 image for OP-TEE as firmware when the driver is
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probed. This returns -EPROBE_DEFER until the firmware is loadable from
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the filesystem which is determined by checking the system_state until
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it is in SYSTEM_RUNNING. This also requires enabling the corresponding
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option in Trusted Firmware for Arm. The documentation there explains
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the security threat associated with enabling this as well as
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mitigations at the firmware and platform level.
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https://trustedfirmware-a.readthedocs.io/en/latest/threat_model/threat_model.html
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Additional documentation on kernel security risks are at
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Documentation/tee/op-tee.rst.
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