[PATCH v2 00/10] efi: Expose loaded image properties via info struct

[Ard Biesheuvel]

From: Ard Biesheuvel <ardb at kernel.org>

Clean up the arm64 build script and linker hacks that zboot uses to
obtain properties of the loaded image (which it cannot access directly
via a relative reference like the ordinary EFI stub).

Instead, define a generic struct efi_image_info, and expose its offset
in the loaded image in a similar manner, but without relying on explicit
linker script exports.

Populate the struct with section markers that all architecture use for
loading the kernel image at boot, so that all the linker exports can be
dropped for them.

Changes since v1:
- drop arm64 image header changes
- move efi_image_info out of __efistub_ scope so it can access vmlinux
  symbols directly
- implement in a generic manner for all architectures that support zboot
- address Sashiko comments

Cc: Jason Gunthorpe <jgg at nvidia.com>
Cc: Paul Walmsley <pjw at kernel.org>
Cc: Palmer Dabbelt <palmer at dabbelt.com>
Cc: Albert Ou <aou at eecs.berkeley.edu>
Cc: Huacai Chen <chenhuacai at kernel.org>
Cc: loongarch at lists.linux.dev
Cc: linux-riscv at lists.infradead.org
Link: https://lore.kernel.org/all/0-v2-989a18390eb1+486-arm64_drtm_jgg@nvidia.com/

Ard Biesheuvel (10):
  efi/zboot: arm64: Add missing barrier after cache maintenance
  efi/riscv: Rename __init_text_end to __inittext_end like other archs
  efi/libstub: Avoid _end section marker in library code
  efi/libstub: Capture loaded image information in struct efi_image_info
  efi/libstub: arm64: Use struct efi_image_info to access image
    properties
  efi/libstub: loongarch: Use struct efi_image_info to access image
    properties
  efi/libstub: riscv: Use struct efi_image_info to access image
    properties
  efi/libstub: Make efi_remap_image() return efi_status_t
  efi/zboot: Disentangle efi_remap_image() from efi_cache_sync_image()
  efi/libstub: arm64: Drop zboot code_size hack

 arch/arm64/boot/Makefile                             |  3 --
 arch/arm64/kernel/efi-header.S                       |  2 +
 arch/arm64/kernel/image-vars.h                       | 10 ----
 arch/loongarch/kernel/head.S                         |  1 +
 arch/loongarch/kernel/image-vars.h                   |  1 -
 arch/riscv/include/asm/sections.h                    |  2 +-
 arch/riscv/kernel/head.S                             |  1 +
 arch/riscv/kernel/image-vars.h                       |  5 --
 arch/riscv/kernel/vmlinux.lds.S                      |  4 +-
 drivers/firmware/efi/libstub/Makefile                |  1 +
 drivers/firmware/efi/libstub/Makefile.zboot          | 11 ++++-
 drivers/firmware/efi/libstub/arm32-stub.c            |  3 ++
 drivers/firmware/efi/libstub/arm64-stub.c            | 20 ++++----
 drivers/firmware/efi/libstub/arm64.c                 |  8 ++--
 drivers/firmware/efi/libstub/efi-stub-entry.c        | 10 +++-
 drivers/firmware/efi/libstub/efi-stub-helper.c       | 15 ++++--
 drivers/firmware/efi/libstub/efi-stub.c              |  3 +-
 drivers/firmware/efi/libstub/efistub.h               | 48 ++++++++++++++++++--
 drivers/firmware/efi/libstub/image_info.S            | 12 +++++
 drivers/firmware/efi/libstub/kaslr.c                 |  2 +-
 drivers/firmware/efi/libstub/loongarch-stub.c        |  4 +-
 drivers/firmware/efi/libstub/riscv-stub.c            | 14 +++---
 drivers/firmware/efi/libstub/zboot-decompress-gzip.c |  2 -
 drivers/firmware/efi/libstub/zboot-decompress-zstd.c |  2 -
 drivers/firmware/efi/libstub/zboot.c                 | 29 +++++++++++-
 drivers/firmware/efi/libstub/zboot.lds               |  6 +--
 26 files changed, 150 insertions(+), 69 deletions(-)
 create mode 100644 drivers/firmware/efi/libstub/image_info.S


base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
-- 
2.56.0.542.g3ef89b7020-goog