[v4,0/5] FF-A VM to VM support

Message

Bertrand Marquis March 24, 2025, 1:52 p.m. UTC

This patch serie adds support to use FF-A between VM for communications
using indirect messages.

It adds a Kconfig parameter to enable this feature and marks it as
experimental as for now there is no system to restrict communication
rights between VM using this system.

It also adds support to use VM to VM communications using FF-A even if
there is no firmware support for FF-A. As this feature enables FF-A
support in all cases, we also introduce a new command line parameter to
allow the user to force which tee is to be used between FF-A and Optee
to have a solution to enable optee support if FF-A VM to VM is enabled.

Changes since v3:
- reintroduce firmare v1.0 support in partinfo
- fix a possible TOC/TOU issue in indirect message handling
- typos and small fixes

Changes since v2:
- Rework partition_info_get implementation
- Taint Xen and display a message when VM to VM is enabled
- Various fixes explained in each patch

Changes since v1 (rfc):
- add a tee command line parameter
- use IS_ENABLED instead of ifdef when possible
- rebase on latest staging

Bertrand Marquis (5):
  xen/arm: Create tee command line parameter
  xen/arm: ffa: Introduce VM to VM support
  xen/arm: ffa: Add buffer full notification support
  xen/arm: ffa: Add indirect message between VM
  xen/arm: ffa: Enable VM to VM without firmware

 docs/misc/xen-command-line.pandoc  |  14 ++
 xen/arch/arm/include/asm/tee/tee.h |   4 +
 xen/arch/arm/tee/Kconfig           |  11 ++
 xen/arch/arm/tee/ffa.c             |  24 ++-
 xen/arch/arm/tee/ffa_msg.c         | 110 ++++++++++--
 xen/arch/arm/tee/ffa_notif.c       | 140 ++++++++-------
 xen/arch/arm/tee/ffa_partinfo.c    | 274 +++++++++++++++++++----------
 xen/arch/arm/tee/ffa_private.h     |  35 +++-
 xen/arch/arm/tee/tee.c             |  31 ++++
 9 files changed, 474 insertions(+), 169 deletions(-)