This series updates Xen’s FF-A mediator on Arm to implement the FF-A
v1.2 interface while keeping existing v1.0/v1.1 guests working.
Patches 1–5 rework the low-level plumbing:
1) add the FF-A v1.2 function IDs and probe the new ABIs
2) track per-VM FFA_VERSION state and enforce negotiation
3) harden RX/TX mapping and validation
4) rework SPMC RX/TX buffer management so access is serialized and
RX buffers are always released back to the SPMC
5) switch the mediator to spec-compliant signed 32-bit status codes
Patches 6–9 update the data structures and direct-call paths:
6) add ffa_uuid helpers and rework partition-info handling
7) refactor direct requests via a common RUN/direct completion helper
8) add the v1.1/v1.2 SEND2 header layout
9) add MSG_SEND_DIRECT_REQ2/RESP2 support and marshal the extended
register set for v1.2 guests
Patch 10 tightens the dispatcher and advertises FF-A v1.2 only to guests
that negotiated v1.2:
- reject SMCCC64 calls from AArch32 guests
- expose the new FIDs and RX/TX capacity fields
- bump Xen's FF-A version to 1.2 once the implementation is complete
v1.0/v1.1 guests continue to use the v1.1 ABI without behaviour changes,
while v1.2 guests can negotiate the wider ABI and use RUN, SEND2, and
DIRECT_REQ2/RESP2 with the extended register set.
This serie was validated through gitlab-ci here:
https://gitlab.com/xen-project/people/bmarquis/xen-ffa-research/-/tree/ffa-v1.2/v0
Build pipeline for the serie:
https://gitlab.com/xen-project/people/bmarquis/xen-ffa-research/-/pipelines/2183322953
Bertrand Marquis (10):
xen/arm: ffa: add FF-A v1.2 function IDs
xen/arm: ffa: per-VM FFA_VERSION negotiation state
xen/arm: ffa: harden RX/TX mapping
xen/arm: ffa: rework SPMC RX/TX buffer management
xen/arm: ffa: use signed 32-bit status codes
xen/arm: ffa: add UUID helpers for partition info
xen/arm: ffa: refactor direct requests via RUN helper
xen/arm: ffa: add v1.2 SEND2 header layout
xen/arm: ffa: add MSG_SEND_DIRECT_REQ2 support
xen/arm: ffa: advertise FF-A v1.2
xen/arch/arm/include/asm/tee/ffa.h | 2 +-
xen/arch/arm/tee/ffa.c | 205 +++++++++++++++++-------
xen/arch/arm/tee/ffa_msg.c | 203 ++++++++++++++++++-----
xen/arch/arm/tee/ffa_notif.c | 14 +-
xen/arch/arm/tee/ffa_partinfo.c | 248 ++++++++++++++++++-----------
xen/arch/arm/tee/ffa_private.h | 133 ++++++++++------
xen/arch/arm/tee/ffa_rxtx.c | 160 +++++++++++++++----
xen/arch/arm/tee/ffa_shm.c | 30 ++--
8 files changed, 703 insertions(+), 292 deletions(-)
--
2.51.2
