[PATCH v9 0/6] introduce tee-based EFI Runtime Variable Service

From: Masahisa Kojima
Date: Fri Oct 13 2023 - 03:46:23 EST


This series introduces the tee based EFI Runtime Variable Service.

The eMMC device is typically owned by the non-secure world(linux in
this case). There is an existing solution utilizing eMMC RPMB partition
for EFI Variables, it is implemented by interacting with
OP-TEE, StandaloneMM(as EFI Variable Service Pseudo TA), eMMC driver
and tee-supplicant. The last piece is the tee-based variable access
driver to interact with OP-TEE and StandaloneMM.

Changelog:
v8 -> v9
- patch #6 "tee: optee: restore efivars ops when tee-supplicant stops"
is newly added
- remove !EFI_VARS_PSTORE Kconfig dependency, we have added a non-blocking
set_variable and it just returns EFI_UNSUPPORTED.
- remove obvious comments

v7 -> v8
Only patch #3 "efi: Add tee-based EFI variable driver" is updated.
- fix typos
- refactor error handling, direct return if applicable
- use devm_add_action_or_reset() for closing of tee context/session
- remove obvious comment

v6 -> v7
Patch #1-#4 are not updated.
Patch #5 is added into this series, original patch is here:
https://lore.kernel.org/all/20230609094532.562934-1-ilias.apalodimas@xxxxxxxxxx/

There are two issues in the v6 series and v7 series addresses those.

1) efivar ops is not restored when the tee-supplicant daemon terminates.
-> As the following patch says, user must remove the device before
terminating tee-supplicant daemon.
https://lore.kernel.org/all/20230728134832.326467-1-sumit.garg@xxxxxxxxxx/

2) cause panic when someone remounts the efivarfs as RW even if
SetVariable is not supported
-> The fifth patch addresses this issue.
"[PATCH v7 5/5] efivarfs: force RO when remounting if SetVariable is
not supported"

v5 -> v6
- new patch #4 is added in this series, #1-#3 patches are unchanged.
automatically update super block flag when the efivarops support
SetVariable runtime service, so that user does not need to manually
remount the efivarfs as RW.

v4 -> v5
- rebase to efi-next based on v6.4-rc1
- set generic_ops.query_variable_info, it works as expected as follows.
$ df -h /sys/firmware/efi/efivars/
Filesystem Size Used Avail Use% Mounted on
efivarfs 16K 1.3K 15K 8% /sys/firmware/efi/efivars

v3 -> v4:
- replace the reference from EDK2 to PI Specification
- remove EDK2 source code reference comments
- prepare nonblocking variant of set_variable, it just returns
EFI_UNSUPPORTED
- remove redundant buffer size check
- argument name change in mm_communicate
- function interface changes in setup_mm_hdr to remove (void **) cast

v2 -> v3:
- add CONFIG_EFI dependency to TEE_STMM_EFI
- add missing return code check for tee_client_invoke_func()
- directly call efivars_register/unregister from tee_stmm_efi.c

rfc v1 -> v2:
- split patch into three patches, one for drivers/tee,
one for include/linux/efi.h, and one for the driver/firmware/efi/stmm
- context/session management into probe() and remove() same as other tee
client driver
- StMM variable driver is moved from driver/tee/optee to driver/firmware/efi
- use "tee" prefix instead of "optee" in driver/firmware/efi/stmm/tee_stmm_efi.c,
this file does not contain op-tee specific code, abstracted by tee layer and
StMM variable driver will work on other tee implementation.
- PTA_STMM_CMD_COMMUNICATE -> PTA_STMM_CMD_COMMUNICATE
- implement query_variable_store() but currently not used
- no use of TEEC_SUCCESS, it is defined in driver/tee/optee/optee_private.h.
Other tee client drivers use 0 instead of using TEEC_SUCCESS
- remove TEEC_ERROR_EXCESS_DATA status, it is referred just to output
error message

Ilias Apalodimas (1):
efivarfs: force RO when remounting if SetVariable is not supported

Masahisa Kojima (5):
efi: expose efivar generic ops register function
efi: Add EFI_ACCESS_DENIED status code
efi: Add tee-based EFI variable driver
efivarfs: automatically update super block flag
tee: optee: restore efivars ops when tee-supplicant stops

drivers/firmware/efi/Kconfig | 15 +
drivers/firmware/efi/Makefile | 1 +
drivers/firmware/efi/efi.c | 18 +
drivers/firmware/efi/stmm/mm_communication.h | 236 +++++++
drivers/firmware/efi/stmm/tee_stmm_efi.c | 617 +++++++++++++++++++
drivers/firmware/efi/vars.c | 8 +
drivers/tee/optee/supp.c | 4 +
fs/efivarfs/super.c | 45 ++
include/linux/efi.h | 13 +
9 files changed, 957 insertions(+)
create mode 100644 drivers/firmware/efi/stmm/mm_communication.h
create mode 100644 drivers/firmware/efi/stmm/tee_stmm_efi.c


base-commit: b691118f2c44d16b84fc65b8147b33620eb18cac
--
2.30.2