[XEN PATCH v6 0/7] FF-A notifications

[Jens Wiklander <jens.wiklander@xxxxxxxxxx>]

Hi,

This patch set adds support for FF-A notifications. We only support
global notifications, per vCPU notifications remain unsupported.

The first three patches are further cleanup and can be merged before the
rest if desired.

A physical SGI is used to make Xen aware of pending FF-A notifications. The
physical SGI is selected by the SPMC in the secure world. Since it must not
already be used by Xen the SPMC is in practice forced to donate one of the
secure SGIs, but that's normally not a problem. The SGI handling in Xen is
updated to support registration of handlers for SGIs that aren't statically
assigned, that is, SGI IDs above GIC_SGI_MAX.

The patch "xen/arm: add and call init_tee_secondary()" provides a hook for
register the needed per-cpu interrupt handler in "xen/arm: ffa: support
notification".

The patch "xen/arm: add and call tee_free_domain_ctx()" provides a hook for
later freeing of the TEE context. This hook is used in "xen/arm: ffa:
support notification" and avoids the problem with TEE context being freed
while we need to access it when handling a Schedule Receiver interrupt. It
was suggested as an alternative in [1] that the TEE context could be freed
from complete_domain_destroy().

[1] 
https://lore.kernel.org/all/CAHUa44H4YpoxYT7e6WNH5XJFpitZQjqP9Ng4SmTy4eWhyN+F+w@xxxxxxxxxxxxxx/

Thanks,
Jens

v5->v6:
- Added Betrands R-B for "xen/arm: add and call tee_free_domain_ctx()",
  "xen/arm: add and call init_tee_secondary()"
- Added Juliens A-B for "xen/arm: allow dynamically assigned SGI handlers"
- Updated "xen/arm: ffa: support notification", details in the patch

v4->v5:
- Added two new patches "xen/arm: add and call init_tee_interrupt()" and
  "xen/arm: add and call tee_free_domain_ctx()"
- Updated "xen/arm: ffa: support notification", details in the patch

v3->v4:
- "xen/arm: ffa: support notification" and
  "xen/arm: allow dynamically assigned SGI handlers" updated as requestsed,
  details in each patch.

v2->v3:
- "xen/arm: ffa: support notification" and
  "xen/arm: allow dynamically assigned SGI handlers" updated as requestsed,
  details in each patch.

v1->v2:
- "xen/arm: ffa: support notification" and
  "xen/arm: allow dynamically assigned SGI handlers" updated as requestsed,
  details in each patch.
- Added Bertrands R-B for "xen/arm: ffa: refactor ffa_handle_call()",
  "xen/arm: ffa: use ACCESS_ONCE()", and
  "xen/arm: ffa: simplify ffa_handle_mem_share()"



Jens Wiklander (7):
  xen/arm: ffa: refactor ffa_handle_call()
  xen/arm: ffa: use ACCESS_ONCE()
  xen/arm: ffa: simplify ffa_handle_mem_share()
  xen/arm: allow dynamically assigned SGI handlers
  xen/arm: add and call init_tee_secondary()
  xen/arm: add and call tee_free_domain_ctx()
  xen/arm: ffa: support notification

 xen/arch/arm/domain.c              |   1 +
 xen/arch/arm/gic.c                 |  12 +-
 xen/arch/arm/include/asm/gic.h     |   2 +-
 xen/arch/arm/include/asm/tee/tee.h |  14 +
 xen/arch/arm/irq.c                 |  18 +-
 xen/arch/arm/smpboot.c             |   2 +
 xen/arch/arm/tee/Makefile          |   1 +
 xen/arch/arm/tee/ffa.c             | 105 +++++--
 xen/arch/arm/tee/ffa_notif.c       | 425 +++++++++++++++++++++++++++++
 xen/arch/arm/tee/ffa_partinfo.c    |   9 +-
 xen/arch/arm/tee/ffa_private.h     |  56 +++-
 xen/arch/arm/tee/ffa_shm.c         |  33 +--
 xen/arch/arm/tee/tee.c             |  14 +-
 xen/include/public/arch-arm.h      |  14 +
 14 files changed, 643 insertions(+), 63 deletions(-)
 create mode 100644 xen/arch/arm/tee/ffa_notif.c

-- 
2.34.1