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Subject[PATCH v1 00/14] tee: optee: add dynamic shared memory support
From: Volodymyr Babchuk <>

This patch series 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 patch series adds generic register/unregister
interface to tee subsystem. Next patches add 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.


Jens Wiklander (2):
tee: flexible shared memory pool creation
tee: add register user memory

Volodymyr Babchuk (12):
tee: shm: add accessors for buffer size and page offset
tee: shm: add page accessor functions
tee: optee: Update protocol definitions
tee: optee: add page list manipulation functions
tee: optee: add shared buffer registration functions
tee: optee: add registered shared parameters handling
tee: optee: add registered buffers handling into RPC calls
tee: optee: store OP-TEE capabilities in private data
tee: optee: add optee-specific shared pool implementation
tee: optee: enable dynamic SHM support
tee: use reference counting for tee_context
tee: shm: inline tee_shm getter functions

drivers/tee/optee/Makefile | 1 +
drivers/tee/optee/call.c | 131 +++++++++++++++++++++-
drivers/tee/optee/core.c | 160 +++++++++++++++++++++------
drivers/tee/optee/optee_msg.h | 38 ++++++-
drivers/tee/optee/optee_private.h | 26 ++++-
drivers/tee/optee/optee_smc.h | 7 ++
drivers/tee/optee/rpc.c | 72 ++++++++++--
drivers/tee/optee/shm_pool.c | 75 +++++++++++++
drivers/tee/optee/shm_pool.h | 23 ++++
drivers/tee/tee_core.c | 81 ++++++++++++--
drivers/tee/tee_private.h | 60 +---------
drivers/tee/tee_shm.c | 226 +++++++++++++++++++++++++++++++-------
drivers/tee/tee_shm_pool.c | 165 +++++++++++++++++-----------
include/linux/tee_drv.h | 184 ++++++++++++++++++++++++++++++-
include/uapi/linux/tee.h | 30 +++++
15 files changed, 1058 insertions(+), 221 deletions(-)
create mode 100644 drivers/tee/optee/shm_pool.c
create mode 100644 drivers/tee/optee/shm_pool.h


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