[U-Boot] [PATCH v5 00/19] efi_loader: non-volatile variables support
AKASHI Takahiro
takahiro.akashi at linaro.org
Thu Sep 5 08:31:54 UTC 2019
One more issue:
* Currently, Travis CI fails in lots of builds.
I will try to fix them in the succeeding versions.
-Takahiro Akashi
On Thu, Sep 05, 2019 at 05:21:14PM +0900, AKASHI Takahiro wrote:
> # 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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> 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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