[U-Boot] [PATCH v5 00/19] efi_loader: non-volatile variables support

AKASHI Takahiro takahiro.akashi at linaro.org
Thu Sep 5 08:21:14 UTC 2019


# In version 5 of this patch set, the implementation is changed again.
#
# I believe that this is NOT intrusive, and that my approach here is NOT
# selfish at all. If Wolfgang doesn't accept this approach, however,
# I would like to go for "Plan B" for UEFI variables implementation, in
# which EFI will have its own drivers for storage instead of env/*.

This patch set is an attempt to implement non-volatile attribute for
UEFI variables. Under the current implementation,
* SetVariable API doesn't recognize non-volatile attribute
* While some variables are defined non-volatile in UEFI specification,
  they are NOT marked as non-volatile in the code.
* env_save() (or "env save" command) allows us to save all the variables
  into persistent storage, but it may cause volatile UEFI variables,
  along with irrelevant U-Boot variables, to be saved unconditionally.

Those observation rationalizes that the implementation of UEFI variables
should be revamped utilizing dedicated storage for them.


Basic ideas:
* Sub-system users of U-Boot environment variables may have their own
  "env contexts". More than one contexts allowed.

  See Patch#2 and Patch#18.

* Each context is isolated from other contexts with different name spaces.
* Each context is associated with one backing storage driver and media
  location.
* Different contexts may use different drivers and locations.

* To access (get or set) a variable, associated context must be presented.
  So, almost of all existing env interfaces are changed to accept one
  extra argument, ctx.
  (I believe that this is Wolfgang's *requirement*.)

  From viewpoint of APIs, env context is a pointer to opaque structure.

* Non-volatile feature is not implemented in a general form and must be
  implemented by users in their sub-systems.

  In version 4, U-Boot environment's attributes are extended to support
  non-volatile (or auto-save capability), but Wolfgang rejected
  my approach.
  As modifying attributes for this purpose would cause bunch of
  incompatibility issues (as far as I said in my cover letter and
  the discussions in ML), I would prefer a much simple approach.

  See patch#19 about how it is easily implemented for UEFI variables.

* Each backing storage driver must be converted to be aligned with
  new env interfaces to handle multiple contexts in parallel and
  provide context-specific Kconfig configurations for driver parameters.

  In this version, only FAT file system and flash devices are supported,
  but it is quite straightforward to modify other drivers.

  See Patch#4 and Patch#5 about how drivers can shift to new interfaces.

* Finally, all existing U-Boot variables hold the same semantics
  as before.


Known issues/restriction/TODO:
* The current form of patchset is not 'bisect'able.
  Not to break 'bisect,' all the patches in this patch set must be
  put into a single commit when merging.
  (This can be mitigated by modifying/splitting Patch#18/#19 though.)

* Unfortunately, this code fails to read U-Boot environment from flash
  at boot time due to incomprehensible memory corruption.
  See murky workaround, which is marked as FIXME, in env/flash.c.

  Despite this bug, I was still be able to run/test my patch by hacking
  the code with gdb.
  (modifying data to correct value on the fly :)
  I hope that it won't affect code review in most places for now.

* Some minor issues for better coding.
  They are also marked as FIXME in the source code.

* Only FAT file system and flash are supported.

* The whole area of storage will be saved at *every* update of
  one UEFI variable. It should be optimized if possible.

* An error during "save" operation may cause inconsistency between
  cache (hash table) and the storage.
    -> This is not UEFI specific though.

* Add tests if necessary.

* I cannot test all the platforms affected by this patchset.


Note:
If we need "secure storage" for UEFI variables, efi_get_variable/
efi_get_next_variable_name/efi_set_variable() should be completely
replaced with stub functions to communicate with secure world.
This patchset has nothing to do with such an implementation.


Usage:
To enable this feature for example with FAT file system, the following
configs must be enabled:
  CONFIG_ENV_IS_IN_FAT
  CONFIG_ENV_FAT_INTERFACE
  CONFIG_ENV_EFI_FAT_DEVICE_AND_PART
  CONFIG_ENV_EFI_FAT_FILE

You may define a non-volatile variable from command interface:
=> setenv -e -nv FOO baa
=> printenv -e FOO
FOO: NV|BS|RT, DataSize = 0x3
    00000000: 62 61 61                                         baa


Patch#1 and #2 are to add multiples 'context' support to env interfaces
  and to provide new env interfaces.
Patch#3 to #5 are to show how the existing drivers for U-Boot environment
  should be modified to be aligned with new env interfaces.
  (Only FAT file system and flash in this version of patch set.)
Patch#6 to #17 are to shift all the existing users of old env interfaces
  to new ones. (But not tested for all the platforms.)
Patch#18 and #19 are to modify UEFI variable implementation to utilize
  new env interfaces.

Changes in v5 (September 4, 2019)
* rebased to v2019.10-rc3
* revamp the implementation, removing changes on environment variable's
  attributes (See above)

Changes in v4 (July 17, 2019)
* remove already-merged patches
* revamp after Wolfgang's suggestion

Changes in v3 (June 4, 2019)
* remove already-merged patches
* revamp the code again
* introduce CONFIG_EFI_VARIABLE_USE_ENV for this configuration.
  Once another backing storage, i.e. StMM services for secure boot,
  is supported, another option will be added.

Changes in v2 (Apr 24, 2019)
* rebased on efi-2019-07
* revamp the implementation

v1 (Nov 28, 2018)
* initial

AKASHI Takahiro (19):
  env: extend interfaces allowing for env contexts
  env: define env context for U-Boot environment
  env: nowhere: rework with new env interfaces
  env: flash: support multiple env contexts
  env: fat: support multiple env contexts
  hashtable: support multiple env contexts
  api: converted with new env interfaces
  arch: converted with new env interfaces
  board: converted with new env interfaces
  cmd: converted with new env interfaces
  common: converted with new env interfaces
  disk: converted with new env interfaces
  drivers: converted with new env interfaces
  fs: converted with new env interfaces
  lib: converted with new env interfaces (except efi_loader)
  net: converted with new env interfaces
  post: converted with new env interfaces
  env,efi_loader: define env context for UEFI variables
  efi_loader: variable: rework with new env interfaces

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 disk/part_amiga.c                             |   4 +-
 drivers/bootcount/bootcount_env.c             |  12 +-
 drivers/ddr/fsl/fsl_ddr_gen4.c                |   2 +-
 drivers/ddr/fsl/interactive.c                 |   5 +-
 drivers/ddr/fsl/options.c                     |   4 +-
 drivers/dfu/dfu.c                             |   6 +-
 drivers/fastboot/fb_command.c                 |   4 +-
 drivers/fastboot/fb_common.c                  |   2 +-
 drivers/fastboot/fb_getvar.c                  |   8 +-
 drivers/fastboot/fb_mmc.c                     |   2 +-
 drivers/input/i8042.c                         |   2 +-
 drivers/input/input.c                         |   2 +-
 drivers/misc/fs_loader.c                      |   8 +-
 drivers/mtd/cfi_flash.c                       |   2 +-
 drivers/mtd/mtd_uboot.c                       |  11 +-
 drivers/net/fec_mxc.c                         |   2 +-
 drivers/net/fm/b4860.c                        |   3 +-
 drivers/net/fm/fdt.c                          |   2 +-
 drivers/net/fm/fm.c                           |   4 +-
 drivers/net/fsl-mc/mc.c                       |   7 +-
 drivers/net/netconsole.c                      |  14 +-
 drivers/net/phy/micrel_ksz90x1.c              |   4 +-
 drivers/net/sandbox-raw.c                     |   4 +-
 drivers/pci/pci.c                             |   4 +-
 drivers/pci/pci_common.c                      |   2 +-
 drivers/reset/reset-socfpga.c                 |   2 +-
 drivers/rtc/m41t60.c                          |   2 +-
 drivers/scsi/scsi.c                           |   2 +-
 drivers/serial/usbtty.c                       |   4 +-
 drivers/usb/gadget/designware_udc.c           |   2 +-
 drivers/usb/gadget/ether.c                    |  13 +-
 drivers/usb/gadget/f_dfu.c                    |   2 +-
 drivers/usb/gadget/f_fastboot.c               |   2 +-
 drivers/usb/gadget/f_rockusb.c                |   2 +-
 drivers/usb/gadget/f_sdp.c                    |   2 +-
 drivers/usb/host/ehci-fsl.c                   |   2 +-
 drivers/video/ati_radeon_fb.c                 |   2 +-
 drivers/video/cfb_console.c                   |   2 +-
 drivers/video/mb862xx.c                       |   2 +-
 drivers/video/mx3fb.c                         |   2 +-
 drivers/video/mxsfb.c                         |   2 +-
 drivers/video/videomodes.c                    |   4 +-
 env/Kconfig                                   | 683 +-----------------
 env/Kconfig.efi                               | 152 ++++
 env/Kconfig.uboot                             | 671 +++++++++++++++++
 env/Makefile                                  |  33 +-
 env/callback.c                                |  40 +-
 env/common.c                                  | 255 ++++---
 env/env.c                                     | 158 ++--
 env/env_ctx_efi.c                             | 131 ++++
 env/env_ctx_uboot.c                           | 292 ++++++++
 env/fat.c                                     | 102 ++-
 env/flags.c                                   |  35 +-
 env/flash.c                                   | 397 ++++++----
 env/nowhere.c                                 |   7 +-
 fs/fs.c                                       |  14 +-
 fs/ubifs/ubifs.c                              |   2 +-
 include/_exports.h                            |   6 +-
 include/common.h                              |   6 +-
 include/env.h                                 | 114 ++-
 include/env_internal.h                        |  89 ++-
 include/exports.h                             |   5 +-
 include/search.h                              |   6 +-
 lib/efi_loader/efi_console.c                  |   2 +-
 lib/efi_loader/efi_variable.c                 |  91 ++-
 lib/fdtdec.c                                  |   2 +-
 lib/hashtable.c                               |  14 +-
 lib/smbios.c                                  |   2 +-
 lib/uuid.c                                    |   2 +-
 net/bootp.c                                   |  17 +-
 net/dns.c                                     |   2 +-
 net/eth-uclass.c                              |   6 +-
 net/eth_common.c                              |  18 +-
 net/eth_legacy.c                              |   2 +-
 net/link_local.c                              |   2 +-
 net/net.c                                     |  11 +-
 net/tftp.c                                    |  10 +-
 net/wol.c                                     |   2 +-
 post/post.c                                   |   2 +-
 371 files changed, 3690 insertions(+), 2337 deletions(-)
 create mode 100644 env/Kconfig.efi
 create mode 100644 env/Kconfig.uboot
 create mode 100644 env/env_ctx_efi.c
 create mode 100644 env/env_ctx_uboot.c

-- 
2.21.0



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