[PATCH v3 00/15] Allow x86 to unflatten DTs

[Alejandro Vallejo <agarciav@xxxxxxx>]

Hi,

New summary when compared to v2:

  * Patches 1 and 2 are just cleanup
  * Patch 3 is a modification of the CODING_STYLE to reflect the unwritten rule
    of splitting type names in words.
  * Patch 4 is a rename of struct bootmodule{,s} to boot_module{,s}, in 
accordance
    to the modification of patch 3. 
  * Patch 5-7 replaces x86-specific boot_{domain,module} defs in favour of
    common ones.
  * The rest are code motion and enablement of x86 to unflatten DTs and use
    some dom0less helpers.

v3 pipeline: 
https://gitlab.com/xen-project/people/agvallejo/xen/-/pipelines/1868636712

v2: https://lore.kernel.org/xen-devel/20250605194810.2782031-1-agarciav@xxxxxxx/
v1: https://lore.kernel.org/xen-devel/20250530120242.39398-1-agarciav@xxxxxxx/

Original cover letter:

This is the aftermath of this discussion:

  
https://lore.kernel.org/xen-devel/DA1WWRUQLCAG.ZTVR1HXJ85V0@xxxxxxx/https://lore.kernel.org/xen-devel/DA1WWRUQLCAG.ZTVR1HXJ85V0@xxxxxxx/

It's a first round of cleanup and preparation to have a much easier time
later when integrating dom0less boot into hyperlaunch.

The refactor on device-tree/ is _fine_ by I'm open to other suggestions
to achieve the same thing. In particular, after this series x86 can
unflatten the DT host device tree when it has CONFIG_DOM0LESS_BOOT set,
which enables the builder to use factored-out functions from
dom0less-build.c (not done here).

The diffstat is deceptive because I renamed a large file and then
created a new file with the same name. There aren't that many LoC
changes.

Alejandro Vallejo (14):
  arm/gnttab: Remove xen/grant_table.h cyclic include
  x86: Preinitialise all modules to be of kind BOOTMOD_UNKNOWN
  CODING_STYLE: Custom type names must be snake-cased by word.
  xen: Rename bootmodule{,s} to boot_module{,s}
  x86: Replace arch-specific boot_module with common one
  xen: Refactor kernel_info to have a header like boot_domain
  x86: Replace arch-specific boot_domain common one bootdomain
  xen/dt: Move bootfdt functions to xen/bootfdt.h
  xen/dt: Move bootinfo functions to a new bootinfo.h
  xen/dt: Rename bootfdt.c -> bootinfo-fdt.c
  xen/dt: Extract helper to map nodes to module kinds
  xen/dt: ifdef out DEV_DT-related bits from device_tree.{c,h}
  xen/dt: Allow CONFIG_DOM0LESS_BOOT to include device-tree/
  kconfig: Allow x86 to pick CONFIG_DOM0LESS_BOOT

 CODING_STYLE                            |   3 +
 xen/arch/arm/dom0less-build.c           |   8 +-
 xen/arch/arm/domain_build.c             |  21 +-
 xen/arch/arm/efi/efi-boot.h             |   6 +-
 xen/arch/arm/include/asm/grant_table.h  |   1 -
 xen/arch/arm/kernel.c                   |  10 +-
 xen/arch/arm/llc-coloring.c             |   8 +-
 xen/arch/arm/mmu/setup.c                |  10 +-
 xen/arch/arm/setup.c                    |  11 +-
 xen/arch/riscv/mm.c                     |   2 +-
 xen/arch/riscv/setup.c                  |   2 +-
 xen/arch/x86/Kconfig                    |   1 +
 xen/arch/x86/cpu/microcode/core.c       |   7 +-
 xen/arch/x86/hvm/dom0_build.c           |   8 +-
 xen/arch/x86/include/asm/boot-domain.h  |  33 --
 xen/arch/x86/include/asm/bootfdt.h      |  56 ++
 xen/arch/x86/include/asm/bootinfo.h     |  57 +--
 xen/arch/x86/pv/dom0_build.c            |   6 +-
 xen/arch/x86/setup.c                    |  58 ++-
 xen/common/Kconfig                      |  13 +-
 xen/common/Makefile                     |   2 +-
 xen/common/device-tree/Makefile         |   9 +-
 xen/common/device-tree/bootfdt.c        | 654 ++----------------------
 xen/common/device-tree/bootinfo-fdt.c   | 583 +++++++++++++++++++++
 xen/common/device-tree/bootinfo.c       |  54 +-
 xen/common/device-tree/device-tree.c    |   2 +
 xen/common/device-tree/dom0less-build.c |  45 +-
 xen/common/device-tree/domain-build.c   |  22 +-
 xen/common/device-tree/kernel.c         |  30 +-
 xen/include/xen/bootfdt.h               | 277 +++-------
 xen/include/xen/bootinfo.h              | 213 ++++++++
 xen/include/xen/device_tree.h           |  44 +-
 xen/include/xen/fdt-domain-build.h      |   2 +-
 xen/include/xen/fdt-kernel.h            |  12 +-
 xen/xsm/xsm_policy.c                    |   4 +-
 35 files changed, 1162 insertions(+), 1112 deletions(-)
 delete mode 100644 xen/arch/x86/include/asm/boot-domain.h
 create mode 100644 xen/arch/x86/include/asm/bootfdt.h
 create mode 100644 xen/common/device-tree/bootinfo-fdt.c
 create mode 100644 xen/include/xen/bootinfo.h

-- 
2.43.0