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authorArnd Bergmann <arnd@arndb.de>2017-12-21 17:23:52 +0100
committerArnd Bergmann <arnd@arndb.de>2017-12-21 17:23:52 +0100
commitbad19e0d0460564a067f901b6848c0cc0c403c52 (patch)
treea18b9f2796aee7ce366108e684c12b5fe9d95f89 /drivers/memory
parentf9988fbb93c8c4de9f8ec37f63ebb7bf705c7c45 (diff)
parentef8e08d24ca84846ce639b835ebd2f15a943f42b (diff)
Merge tag 'tee-drv-dynamic-shm-for-v4.16' of https://git.linaro.org/people/jens.wiklander/linux-tee into next/drivers
Pull "tee dynamic shm for v4.16" from Jens Wiklander: This pull request enables dynamic shared memory support in the TEE subsystem as a whole and in OP-TEE in particular. Global Platform TEE specification [1] allows client applications to register part of own memory as a shared buffer between application and TEE. This allows fast zero-copy communication between TEE and REE. But current implementation of TEE in Linux does not support this feature. Also, current implementation of OP-TEE transport uses fixed size pre-shared buffer for all communications with OP-TEE OS. This is okay in the most use cases. But this prevents use of OP-TEE in virtualized environments, because: a) We can't share the same buffer between different virtual machines b) Physically contiguous memory as seen by VM can be non-contiguous in reality (and as seen by OP-TEE OS) due to second stage of MMU translation. c) Size of this pre-shared buffer is limited. So, first part of this pull request adds generic register/unregister interface to tee subsystem. The second part adds necessary features into OP-TEE driver, so it can use not only static pre-shared buffer, but whole RAM to communicate with OP-TEE OS. This change is backwards compatible allowing older secure world or user space to work with newer kernels and vice versa. [1] https://www.globalplatform.org/specificationsdevice.asp * tag 'tee-drv-dynamic-shm-for-v4.16' of https://git.linaro.org/people/jens.wiklander/linux-tee: tee: shm: inline tee_shm_get_id() tee: use reference counting for tee_context tee: optee: enable dynamic SHM support tee: optee: add optee-specific shared pool implementation tee: optee: store OP-TEE capabilities in private data tee: optee: add registered buffers handling into RPC calls tee: optee: add registered shared parameters handling tee: optee: add shared buffer registration functions tee: optee: add page list manipulation functions tee: optee: Update protocol definitions tee: shm: add page accessor functions tee: shm: add accessors for buffer size and page offset tee: add register user memory tee: flexible shared memory pool creation
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