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