[PATCH v4 0/2] x86: add support for reserved memory defined by DT

[Grzegorz Jaszczyk <jaszczyk@chromium.org>]

Currently x86 allows to boot with ACPI and DT at the same time and basic DT
support is already in place but processing DT reserved memory was missing.

The DT reserved-memory nodes can be present in DT as described in
Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml.
Similar to other architecture, which supports DT, there is a need to
scan and register reserved memory regions on x86 for such nodes. It is required
by drivers (e.g. open-dice driver) to process DT reserved-memory regions.

v3 -> v4:
- Rebased onto latest upstream baseline. Previous series:
 https://lore.kernel.org/all/20250618210628.2635891-1-jaszczyk@chromium.org/
- Improved commit logs
- Improved e820__reserve_nomap_region to perform e820__update_table_print only
once
- Fixed e820__reserve_nomap_region by passing region->base instead of truncated
start address and original size, which was wrong

v2 -> v3:
- Patch #1 which extends of/reserved_mem and adds the possibility to register an
arch specific hook was dropped. Instead "x86/e820: reserve corresponding to DT
reserved-memory nomap region" was introduced.
- "x86/of: add support for reserved memory defined by DT" stop relying on arch
specific hook. Also calling x86_flattree_get_config was moved and is now called
earlier during memblock setup.
For more info please refer to commit log description and v2 discussion:
https://lore.kernel.org/all/20250418124718.1009563-1-jaszczyk@chromium.org/

Grzegorz Jaszczyk (2):
  x86/of: add early setup of DT reserved-memory nodes
  x86/e820: reserve corresponding to DT reserved-memory nomap region

 arch/x86/include/asm/e820/api.h |  1 +
 arch/x86/kernel/devicetree.c    |  1 +
 arch/x86/kernel/e820.c          | 20 ++++++++++++++++++++
 arch/x86/kernel/setup.c         |  6 ++++--
 4 files changed, 26 insertions(+), 2 deletions(-)

-- 
2.53.0.851.ga537e3e6e9-goog