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Subject[GIT PULL] tee dynamic shm for v4.16
Hello arm-soc maintainers,

Please pull these tee driver changes. This implements support for dynamic
shared memory support in OP-TEE. More specifically is enables mapping of
user space memory in secure world to be used as shared memory.

This has been reviewed and refined by the OP-TEE community at various
places on Github during the last year. An earlier version of this pull
request is used in the latest OP-TEE release (2.6.0). This has also been
reviewed recently at the kernel mailing lists, with all comments from
Mark Rutland <mark.rutland@arm.com> and Yury Norov
<ynorov@caviumnetworks.com> addressed as far as I can tell.

This isn't a bugfix so I'm aiming for the next merge window.

Thanks,
Jens


The following changes since commit 50c4c4e268a2d7a3e58ebb698ac74da0de40ae36:

Linux 4.15-rc3 (2017-12-10 17:56:26 -0800)

are available in the git repository at:

https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/tee-drv-dynamic-shm-for-v4.16

for you to fetch changes up to ef8e08d24ca84846ce639b835ebd2f15a943f42b:

tee: shm: inline tee_shm_get_id() (2017-12-15 13:36:21 +0100)

----------------------------------------------------------------
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

----------------------------------------------------------------
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_get_id()

drivers/tee/optee/Makefile | 1 +
drivers/tee/optee/call.c | 179 +++++++++++++++++++++++++++++-
drivers/tee/optee/core.c | 152 +++++++++++++++++++------
drivers/tee/optee/optee_msg.h | 38 ++++++-
drivers/tee/optee/optee_private.h | 27 ++++-
drivers/tee/optee/optee_smc.h | 7 ++
drivers/tee/optee/rpc.c | 77 +++++++++++--
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 | 228 +++++++++++++++++++++++++++++++-------
drivers/tee/tee_shm_pool.c | 165 ++++++++++++++++-----------
include/linux/tee_drv.h | 183 +++++++++++++++++++++++++++++-
include/uapi/linux/tee.h | 30 +++++
15 files changed, 1105 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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