[PATCH v4 0/2] Xen FF-A mediator

[Jens Wiklander <jens.wiklander@xxxxxxxxxx>]

Hi,

This patch sets add a FF-A [1] mediator modeled after the TEE mediator
already present in Xen. The FF-A mediator implements the subset of the FF-A
1.1 specification needed to communicate with OP-TEE using FF-A as transport
mechanism instead of SMC/HVC as with the TEE mediator. It allows a similar
design in OP-TEE as with the TEE mediator where OP-TEE presents one virtual
partition of itself to each guest in Xen.

The FF-A mediator is generic in the sense it has nothing OP-TEE specific
except that only the subset needed for OP-TEE is implemented so far. The
hooks needed to inform OP-TEE that a guest is created or destroyed is part
of the FF-A specification.

It should be possible to extend the FF-A mediator to implement a larger
portion of the FF-A 1.1 specification without breaking with the way OP-TEE
is communicated with here. So it should be possible to support any TEE or
Secure Partition using FF-A as transport with this mediator.

[1] https://developer.arm.com/documentation/den0077/latest

Thanks,
Jens

v2->v3:
* Generates offsets into struct arm_smccc_1_2_regs with asm-offsets.c in
  order to avoid hard coded offsets in the assembly function
  arm_smccc_1_2_smc()
* Adds an entry in SUPPORT.md on the FF-A status
* Adds a configuration variable "ffa_enabled" to tell if FF-A should be
  enabled for a particular domu guest
* Moves the ffa_frag_list for fragmented memory share requests into
  struct ffa_ctx instead to keep it per guest in order to avoid mixups
  and simplify locking
* Adds a spinlock to struct ffa_ctx for per guest locking
* Addressing style issues and suggestions
* Uses FFA_FEATURES to check that all the needed features are available
  before initializing the mediator
* Rebased on staging as of 2022-06-20

v1->v2:
* Rebased on staging to resolve some merge conflicts as requested

Jens Wiklander (2):
  xen/arm: smccc: add support for SMCCCv1.2 extended input/output
    registers
  xen/arm: add FF-A mediator

 SUPPORT.md                        |    7 +
 tools/libs/light/libxl_arm.c      |    3 +
 tools/libs/light/libxl_types.idl  |    1 +
 tools/xl/xl_parse.c               |    3 +
 xen/arch/arm/Kconfig              |   11 +
 xen/arch/arm/Makefile             |    1 +
 xen/arch/arm/arm64/asm-offsets.c  |    9 +
 xen/arch/arm/arm64/smc.S          |   43 +
 xen/arch/arm/domain.c             |   10 +
 xen/arch/arm/domain_build.c       |    1 +
 xen/arch/arm/ffa.c                | 1683 +++++++++++++++++++++++++++++
 xen/arch/arm/include/asm/domain.h |    4 +
 xen/arch/arm/include/asm/ffa.h    |   71 ++
 xen/arch/arm/include/asm/smccc.h  |   40 +
 xen/arch/arm/vsmc.c               |   19 +-
 xen/include/public/arch-arm.h     |    2 +
 16 files changed, 1904 insertions(+), 4 deletions(-)
 create mode 100644 xen/arch/arm/ffa.c
 create mode 100644 xen/arch/arm/include/asm/ffa.h

-- 
2.31.1