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

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

 xen/arch/arm/Kconfig              |   11 +
 xen/arch/arm/Makefile             |    1 +
 xen/arch/arm/arm64/smc.S          |   43 +
 xen/arch/arm/domain.c             |   10 +
 xen/arch/arm/ffa.c                | 1624 +++++++++++++++++++++++++++++
 xen/arch/arm/include/asm/domain.h |    4 +
 xen/arch/arm/include/asm/ffa.h    |   71 ++
 xen/arch/arm/include/asm/smccc.h  |   42 +
 xen/arch/arm/vsmc.c               |   19 +-
 9 files changed, 1821 insertions(+), 4 deletions(-)
 create mode 100644 xen/arch/arm/ffa.c
 create mode 100644 xen/arch/arm/include/asm/ffa.h

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2.31.1