[Xen-devel] [PATCH v5 00/10] TEE mediator (and OP-TEE) support in XEN

[Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>]

Hello community,

This is the fifth version of OP-TEE mediator in XEN.

OP-TEE 3.5.0 was released when I worked on this version of the
pathes. This is the first release where virtualization support is
available. This release includes both original virtualization patches
and new SMC that retrevies number of threads from OP-TEE.

Many thanks to both OP-TEE and Xen communities for reviewing and helping
with my changes to the both projects.

Global changes from v4:
 - Substantial rework of OP-TEE mediator. Now it tries to return meaningful
   error codes back to the guest.
 - OP-TEE mediator does not use struct cpu_user_regs as a storage for
   parameters and return values when calling OP-TEE. This makes it
   compatbile with requirement from SMCCC.
 - tee=native option replaced with tee=optee
 - Authorship and s-o-b tag reset to my EPAM mail address

Overall changes from v3:

 - Patch "arm: add tee_enabled flag to xen_arch_domainconfig" was
   squashed into "xen/arm: add generic TEE mediator framework"
 - I implemented more elaborate error repoting to a guest. Now guest
   will get meaningful error codes instead of generic
   ARM_SMCCC_ERR_UNKNOWN_FUNCTION.

Per-patch changes are described in corresponding emails.

Changes from v2:

 - Use domain flags insted of domctl interface to enable optee for guests
 - Remove patch "libxc: add xc_dom_tee_enable(...) function" because
   of previous change
 - Mediator now stores own context in arch part of struct domain, so
   I removed patch "optee: add domain contexts"

Per-patch changes are described in corresponding emails.

====
v2:

This is v2 of patch series for OP-TEE mediator support in XEN. Changes from v1:

 - Added domctl interface, so now xl decides what domain should work with TEE
 - Removed XSM support due to change described above
 - Patch with OP-TEE mediator was splited to 7 separate patches
 - Removed patch with call_smccc() function. Now this series depend on
   Julien Grall's series "xen/arm: SMCCC fixup and improvement" [3]

=====
v1:

This is follow for patch series [1]. There was lots of discussions
for that series and I tried to address all of them in this new patchset.

Currently, I had a working solution for OP-TEE virtualization and it is being
upstreamed right now ([2]). So, I think it is a good time to introduce support
in XEN as well.

This series include generic TEE mediator framework and full-scale OP-TEE 
mediator
which is working with mentioned chages in OP-TEE. So, multiple domains can
work simultaneously with OP-TEE.

I added XSM support, so now it is possible to control which domains can work
with TEEs. Also I changed way how TEE discovery is done. Now  it is very
generic and should support any platform.

[1] https://lists.xenproject.org/archives/html/xen-devel/2017-10/msg01451.html
[2] https://github.com/OP-TEE/optee_os/pull/2370
[3] https://lists.xenproject.org/archives/html/xen-devel/2018-08/msg02138.html


Volodymyr Babchuk (10):
  xen/arm: add generic TEE mediator framework
  xen/arm: optee: add OP-TEE header files
  xen/arm: optee: add OP-TEE mediator skeleton
  xen/arm: optee: add fast calls handling
  xen/arm: optee: add std call handling
  xen/arm: optee: add support for RPC SHM buffers
  xen/arm: optee: add support for arbitrary shared memory
  xen/arm: optee: add support for RPC commands
  tools/arm: tee: add "tee" option for xl.cfg
  tools/arm: optee: create optee firmware node in DT if tee=optee

 MAINTAINERS                         |    6 +
 docs/man/xl.cfg.5.pod.in            |   19 +
 tools/libxl/libxl.h                 |    5 +
 tools/libxl/libxl_arm.c             |   42 +
 tools/libxl/libxl_types.idl         |    6 +
 tools/xl/xl_parse.c                 |    9 +
 xen/arch/arm/Kconfig                |    9 +
 xen/arch/arm/Makefile               |    1 +
 xen/arch/arm/domain.c               |   19 +
 xen/arch/arm/setup.c                |    2 +
 xen/arch/arm/tee/Kconfig            |    4 +
 xen/arch/arm/tee/Makefile           |    2 +
 xen/arch/arm/tee/optee.c            | 1536 +++++++++++++++++++++++++++
 xen/arch/arm/tee/tee.c              |   93 ++
 xen/arch/arm/vsmc.c                 |    5 +
 xen/arch/arm/xen.lds.S              |    7 +
 xen/include/asm-arm/domain.h        |    4 +
 xen/include/asm-arm/tee/optee_msg.h |  444 ++++++++
 xen/include/asm-arm/tee/optee_smc.h |  556 ++++++++++
 xen/include/asm-arm/tee/tee.h       |  109 ++
 xen/include/public/arch-arm.h       |    4 +
 21 files changed, 2882 insertions(+)
 create mode 100644 xen/arch/arm/tee/Kconfig
 create mode 100644 xen/arch/arm/tee/Makefile
 create mode 100644 xen/arch/arm/tee/optee.c
 create mode 100644 xen/arch/arm/tee/tee.c
 create mode 100644 xen/include/asm-arm/tee/optee_msg.h
 create mode 100644 xen/include/asm-arm/tee/optee_smc.h
 create mode 100644 xen/include/asm-arm/tee/tee.h

-- 
2.21.0

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