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Date:   Wed, 6 Dec 2017 15:32:42 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Volodymyr Babchuk <volodymyr_babchuk@...m.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        tee-dev@...ts.linaro.org,
        Volodymyr Babchuk <vlad.babchuk@...il.com>
Subject: Re: [RESEND PATCH v2 00/14] tee: optee: add dynamic shared memory
 support

On Wed, Nov 29, 2017 at 02:48:24PM +0200, Volodymyr Babchuk wrote:
> From: Volodymyr Babchuk <vlad.babchuk@...il.com>
> 
> Hello all,
> 
> This is resend of OP-TEE dynamic SHM series. No changes
> from last time. Correct version is used in the subject.
> 
> ---
> Changes from v1:
> 
>  * Added support for 16K and 64K pages.  Elaborated commit messages
>  * More minor changes are described in corresponding patches.
> 
> While this patches are necessary for use OP-TEE in virualized
> environment, they are not sufficient. Stuart Yoder was right, when
> proposed to make static SHM optional. But that would be a breaking
> change, because this will render unusable older client libraries and
> supplicants.
> 
> Also, as Mark Rutland pointed, OP-TEE virtualization will need support
> from hypervisor side.
> 
> Anyways, those patches allowed me to call OP-TEE from XEN's Dom0
> without remapping static SHM region into Dom0 userspace.
> 
> Also, this patches allow me to share quite big buffers (I tried to use
> three 2M buffers at a time). This is imposible with static SHM,
> because static SHM on most platforms is only 2M.
> 
> Thanks to Yury Norov <ynorov@...iumnetworks.com> and
> Mark Rutland <mark.rutland@....com> for reviewing this patch series.
> 
> ---
> v1 cover letter:
> 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.
> 
> [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             | 227 +++++++++++++++++++++++++++++++-------
>  drivers/tee/tee_shm_pool.c        | 165 ++++++++++++++++-----------
>  include/linux/tee_drv.h           | 183 +++++++++++++++++++++++++++++-
>  include/uapi/linux/tee.h          |  30 +++++
>  15 files changed, 1104 insertions(+), 221 deletions(-)
>  create mode 100644 drivers/tee/optee/shm_pool.c
>  create mode 100644 drivers/tee/optee/shm_pool.h
> 
> -- 
> 2.7.4
> 

This looks good to me. I've been testing this for quite some time now.
If there's no further comments I'll pick it up send it in a pull request
to arm-soc.

Thanks,
Jens

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