[PATCH 00/16] efi_loader: non-volatile and runtime variables

[Heinrich Schuchardt]

On 3/27/20 8:44 PM, Simon Glass wrote:
> Hi Heinrich,
>
> On Thu, 26 Mar 2020 at 23:28, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>>
>> Up to UEFI variable where stored in U-Boot environment variables. Saving
>
> That doesn't read right to me.

This should be:

Up to now UEFI variable were stored in U-Boot environment variables

>
>> UEFI variables was not possible without saving the U-Boot environment
>> variables.
>>
>> With this patch series file ubootefi.var in the EFI system partition is
>> used for saving UEFI variables.
>>
>> Furthermore the UEFI variables are exposed at runtime and are writable at
>> runtime.
>>
>> The missing piece is transferring the variable changed at runtime back to
>> the firmware. I will evaluate the following options:
>>
>> * using a fixed memory address: we could read the memory area after a
>>    reboot
>> * using a systemd service which is called before the system goes down
>>
>> Many of the CCs are due to the changes in disk/part_efi.c. Here the logic
>> to detect the EFI system partition is introduced (patch 04/16).
>>
>> Heinrich Schuchardt (16):
>>    cmd: efidebug: fix int to pointer cast
>>    efi_loader: only reserve memory if fdt node enabled
>>    efi_loader: eliminate EFI_CALL() for variable access
>>    part: detect EFI system partition
>>    efi_loader: identify EFI system partition
>>    efi_loader: keep attributes in efi_set_variable_int()
>>    efi_loader: export initialization state
>>    efi_loader: change setup sequence
>>    efi_loader: imply FAT, FAT_WRITE
>>    efi_loader: UEFI variable persistence
>>    efi_loader: export efi_convert_pointer()
>>    efi_loader: optional pointer for ConvertPointer
>>    efi_loader: memory buffer for variables
>>    efi_loader: use memory based variable storage
>>    efi_loader: enable UEFI variables at runtime
>>    efi_selftest: adjust runtime test for variables
>>
>>   cmd/bootefi.c                                 |   3 +-
>>   cmd/efidebug.c                                |  71 +-
>>   cmd/nvedit_efi.c                              |  18 +-
>>   disk/part_dos.c                               |  10 +-
>>   disk/part_efi.c                               |  12 +-
>>   include/efi_api.h                             |   2 +
>>   include/efi_loader.h                          |  22 +
>>   include/efi_variable.h                        |  52 ++
>>   include/part.h                                |  11 +-
>>   lib/efi_loader/Kconfig                        |  10 +
>>   lib/efi_loader/Makefile                       |   2 +
>>   lib/efi_loader/efi_bootmgr.c                  |  20 +-
>>   lib/efi_loader/efi_disk.c                     |  20 +
>>   lib/efi_loader/efi_runtime.c                  |  20 +-
>>   lib/efi_loader/efi_setup.c                    |  54 +-
>>   lib/efi_loader/efi_variable.c                 | 635 ++++++------------
>>   lib/efi_loader/efi_variables_file.c           | 235 +++++++
>>   lib/efi_loader/efi_variables_mem.c            | 324 +++++++++
>>   .../efi_selftest_variables_runtime.c          |  47 +-
>>   19 files changed, 1037 insertions(+), 531 deletions(-)
>>   create mode 100644 include/efi_variable.h
>>   create mode 100644 lib/efi_loader/efi_variables_file.c
>>   create mode 100644 lib/efi_loader/efi_variables_mem.c
>
> Can you use 'vars' instead of variables as these filenames are too long.

Sure

Regards

Heinrich