[PATCH v4 00/22] arm64: FF-A runtime transport for EFI variables

Hi all,

This series adds FF-A runtime transport support so EFI variable runtime
services can communicate with the secure world after ExitBootServices().
It also extends tests, documentation, and Corstone-1000 configuration to
validate the runtime path and keep boot-time behavior aligned with the
runtime flow.

Changes in this series:
- Add EFI runtime-safe memset helper and FF-A runtime transport support.
- Add runtime-safe FF-A direct-message handling and ExitBootServices setup.
- Implement FF-A runtime communication in the EFI variable TEE backend.
- Enable EFI runtime SetVariable(), GetVariable(), GetNextVariableName(),
  and QueryVariableInfo() over the FF-A transport.
- Add sandbox FF-A runtime transport tests.
- Extend EFI selftests for runtime variables and enable bootefi selftest
  on Corstone-1000.
- Document the FF-A runtime transport and runtime-variable selftest flow.

Changes in v4:

Address Ilias Apalodimas's review comments:
- Split FF-A bus runtime support into smaller patches covering runtime
  private data, SMC invocation, direct-message helpers, boot-time reuse,
  and ExitBootServices setup.
- Split the ARMv8 cache range-maintenance runtime annotations into a
  separate patch.
- Split the EFI variable TEE runtime SetVariable(), GetVariable(),
  GetNextVariableName(), and QueryVariableInfo() support into separate
  patches.
- Replace MM SP status macros with an enum.
- Keep OP-TEE as the runtime fallback when FF-A runtime mode is not
  enabled.

Other changes:
- Rebased the series onto current U-Boot master.

Changes in v3:

Address Simon Glass's review comments:
- Move FF-A ExitBootServices event registration to the end of probe and
  clean up RX/TX buffer handling on failure.
- Rename FF-A runtime-context helpers to the ffa_runtime_context_* form.
- Rework FF-A/MM cache maintenance to cover only rounded request and
  response ranges.
- Add SetVirtualAddressMap handling for the FF-A shared buffer.
- Document FF-A shared-buffer ownership and alignment assumptions.
- Add EFIAPI to the TEE runtime GetVariable and GetNextVariableName
  entry points.
- Tighten sandbox FF-A runtime tests and reset runtime state between
  test cases.
- Update FF-A and bootefi documentation for the runtime transport and
  split runtime-variable selftests.
- Rework commit messages to drop redundant information.

Address Ilias Apalodimas's review comments:
- Keep efi_var_common.c unchanged and drop commit 6 from v2 patchset.
- Rename the TEE/FF-A runtime handlers to the *_int_runtime form.
- Remove log_*() calls from __efi_runtime FF-A/MM communication paths.

Other:
- Fix FF-A memory-share sender_id to use the runtime private endpoint
  ID after rebasing.
- Fix the expected QueryVariableInfo() return status for the
  TEE-backed runtime selftest path.


Changes in v2:

Address Simon Glass's review comments:
- Fix efi_memset_runtime() style, declaration, and byte cast
- Tighten the FF-A runtime context failure path, clean up arm-ffa-runtime.c
  style issues, and move ExitBootServices event registration earlier in probe
- Add shared-buffer bounds/alignment checks, and tightening comments/kernel-doc
- Document the FF-A shared buffer cacheline-alignment requirement and add
  BUILD_BUG_ON() checks for the address
- Cache attributes before the shared buffer is reused, moving the read-only
  check earlier, and split the u16_strsize() related change in separate patch
- Reword commit messages for the runtime helper relocation
- Rework the non-volatile runtime variable selftest into setup/verify phases
- Extend the sandbox FF-A runtime tests with no-context coverage,
  runtime-context reset, and separate errno-mapping coverage
- Refresh the FF-A runtime transport and bootefi documentation
- Drop patch 12 in v1, as ffa_mm_communicate handles both runtime and
  boottime capabilities in v2
- Squash patch 8 and patch 9 from v1

Address Ilias Apalodimas's review comments:
- Reuse common MM SP error mapping for boot and runtime paths
- Rename runtime-phase tracking to reflect the ExitBootServices transition
- Collapse duplicated boot-time and runtime MM communication helpers into common
  implementations
- Keep the arm64 cache-maintenance path runtime-safe
- Move FF-A shared-buffer runtime memory-map registration to the end of
  variable-service initialization

Link to v3: https://lore.kernel.org/u-boot/[email protected]/
Link to v2: https://lore.kernel.org/u-boot/[email protected]/
Link to v1: https://lore.kernel.org/u-boot/[email protected]/

Harsimran Singh Tungal (22):
  efi_loader: add runtime memset helper
  arm-ffa: store boot-discovered runtime data separately
  arm-ffa: add runtime-safe FF-A SMC wrapper
  arm-ffa: add runtime direct-message support
  arm-ffa: reuse direct-message helper at boot time
  arm-ffa: enable runtime context at ExitBootServices
  arm: cache: keep range maintenance available at EFI runtime
  efi_loader: add MM SP status mapping for FF-A variables
  efi_loader: make MM transport selection runtime-safe
  efi_loader: make FF-A MM SP notification runtime-safe
  efi_loader: make FF-A MM communication runtime-safe
  efi_loader: reserve FF-A shared buffer for runtime variables
  efi_loader: enable TEE runtime SetVariable() over FF-A
  efi_loader: enable TEE runtime GetVariable() over FF-A
  efi_loader: enable TEE runtime GetNextVariableName() over FF-A
  efi_loader: enable TEE runtime QueryVariableInfo() over FF-A
  charset: mark u16_strsize() as __efi_runtime
  corstone1000: enable bootefi selftest
  efi: selftest: add runtime variable tests with non-volatile storage
  test: dm: add sandbox FF-A runtime transport tests
  doc: arm64: document FF-A runtime path for EFI variables
  doc: bootefi: note two-phase runtime variables selftest

 arch/arm/cpu/armv8/cache.S                    |   8 +
 arch/arm/cpu/armv8/cache_v8.c                 |  13 +-
 arch/sandbox/include/asm/sandbox_arm_ffa.h    |  16 +-
 configs/corstone1000_defconfig                |   3 +
 doc/arch/arm64.ffa.rst                        |  88 ++-
 doc/usage/cmd/armffa.rst                      |  11 +
 doc/usage/cmd/bootefi.rst                     |  31 +
 drivers/firmware/arm-ffa/Kconfig              |  11 +
 drivers/firmware/arm-ffa/Makefile             |   4 +-
 drivers/firmware/arm-ffa/arm-ffa-runtime.c    | 294 +++++++
 drivers/firmware/arm-ffa/arm-ffa-uclass.c     | 114 +--
 drivers/firmware/arm-ffa/arm-ffa.c            |  16 +-
 drivers/firmware/arm-ffa/ffa-emul-uclass.c    |  49 +-
 include/arm_ffa.h                             |  16 +-
 include/arm_ffa_priv.h                        |  22 +-
 include/arm_ffa_runtime.h                     | 191 +++++
 include/efi_loader.h                          |   3 +
 lib/charset.c                                 |   2 +-
 lib/efi_loader/Kconfig                        |   4 +
 lib/efi_loader/efi_runtime.c                  |  20 +
 lib/efi_loader/efi_variable_tee.c             | 739 +++++++++++++++---
 .../efi_selftest_variables_runtime.c          | 715 +++++++++++------
 test/dm/Makefile                              |   3 +-
 test/dm/ffa.c                                 |   6 +-
 test/dm/ffa_runtime.c                         | 123 +++
 25 files changed, 2004 insertions(+), 498 deletions(-)
 create mode 100644 drivers/firmware/arm-ffa/arm-ffa-runtime.c
 create mode 100644 include/arm_ffa_runtime.h
 create mode 100644 test/dm/ffa_runtime.c

-- 
2.34.1