ACK: [JAMMY][PATCH v2 0/3] Backport support to tolerate ZSTD compressed firmware files

[Roxana Nicolescu]

On 27/07/2023 18:31, Dimitri John Ledkov wrote:
> [ Impact ]
>
>   * To ensure reliable dist-upgrades in case of partial upgrades or
>     upgrade failures, it is desirable for LTS GA kernel to support
>     features that next-LTS GA kernel will rely on.
>
>   * Specifically it is being discussed to switch linux-firmware to ZSTD
>     compressed one
>
>   * To ensure that failed dist-upgrades can still boot after-partial
>     upgrade it is desirable to suppport zstd compressed firmware
>
> [ Test Plan ]
>
>   * Boot new build of GA linux kernel with
>     CONFIG_FW_LOADER_COMPRESS_ZSTD
>
>   * Check that existing firmware files loaded on a given machine can be
>     compressed with zstd and still loaded by this kernel
>
>   * Check that depmod / initramfs-tools all support .zst compressed
>     firmware
>
> [ Where problems could occur ]
>
>   * Once this is inroduced in jammy-GA kernel it may cripple into
>     focal-hwe kernels too, and people may start relying on this feature
>     despite not universally supported by all other focal kernels. This
>     should be trivial to catch in SRUs for example, do not accept SRUs
>     of firmwares that ship themselves as .zst in Jammy and lower.
>
> [ Other Info ]
>
>   * See
>     https://lists.ubuntu.com/archives/ubuntu-devel/2023-July/042652.html
>
> Changes since v1:
>
>   * Squish cherry-pick + sauce, into a single backported from commit
>   * Add note what was changed, following which API change commit
>
> Dimitri John Ledkov (1):
>    UBUNTU: [Config] Enable FW_LOADER_COMPRESS_ZSTD by default
>
> Randy Dunlap (1):
>    firmware_loader: EXTRA_FIRMWARE does not support compressed files
>
> Takashi Iwai (1):
>    firmware: Add the support for ZSTD-compressed firmware files
>
>   debian.master/config/annotations     |  3 ++
>   drivers/base/firmware_loader/Kconfig | 27 ++++++++--
>   drivers/base/firmware_loader/main.c  | 76 ++++++++++++++++++++++++++--
>   3 files changed, 98 insertions(+), 8 deletions(-)
>
Acked-by: Roxana Nicolescu <roxana.nicolescu at canonical.com>