Hi, On Thu, Sep 28, 2017 at 09:03:57PM +0300, Volodymyr Babchuk wrote: > From: Volodymyr Babchuk <vlad.babc...@gmail.com> > > 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.
I'm afraid that I don't follow the arguments for virtualized OP-TEE usage. In a virtualised environment, TEE access *must* be mediated via the hypervisor, which can virtualise the interface, pin pages, etc. Could you elaborate on how you expect TEE access to work in a virtualised environment? Thanks, Mark. > 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. > > [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 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 > > -- > 2.7.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-ker...@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
