linux-kernel - [PATCH v2 0/2] x86: add support for reserved memory defined by DT

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Message-ID: <20250418124718.1009563-1-jaszczyk@chromium.org>
Date: Fri, 18 Apr 2025 12:47:16 +0000
From: Grzegorz Jaszczyk <jaszczyk@...omium.org>
To: tglx@...utronix.de,
	robh@...nel.org
Cc: mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	saravanak@...gle.com,
	dmaluka@...omium.org,
	bgrzesik@...gle.com,
	jaszczyk@...gle.com,
	ilpo.jarvinen@...ux.intel.com,
	usamaarif642@...il.com,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	tnowicki@...gle.com,
	mazurekm@...gle.com,
	vineethrp@...gle.com,
	Grzegorz Jaszczyk <jaszczyk@...omium.org>
Subject: [PATCH v2 0/2] x86: add support for reserved memory defined by DT

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.

Patch #1 extends of/reserved_mem and adds the possibility to register an arch
specific hook, which will allow to validate if reserved-memory region passed by
DT is valid.

Patch #2, uses introduced in Patch #1 API and registers x86 specific hook, which
will validate if reserved-memory region passed by DT is covered by E820 reserved
region entry.

For more details please refer to the commit log description of individual
patches.

v1 -> v2: simplify and fix off-by-one in x86_is_region_reserved as suggested by
          Dmytro Maluka offline

Grzegorz Jaszczyk (2):
  of: fdt: allow to register arch specific hook validating reserved
    region
  x86/of: add support for reserved memory defined by DT

 arch/x86/kernel/devicetree.c |  9 +++++++++
 drivers/of/of_reserved_mem.c | 14 ++++++++++++++
 include/linux/of_fdt.h       |  4 ++++
 3 files changed, 27 insertions(+)

-- 
2.49.0.805.g082f7c87e0-goog