[v4,0/4] Introduce static heap

Message

Henry Wang Sept. 7, 2022, 2:35 p.m. UTC

The static heap, or statically configured heap, refers to parts
of RAM reserved in the beginning for heap. Like the static memory
allocation, such static heap regions are reserved by configuration
in the device tree using physical address ranges.

This feature is useful to run Xen on Arm MPU systems, where only a
finite number of memory protection regions are available. The limited
number of protection regions places requirement on planning the use
of MPU protection regions and one or more MPU protection regions needs
to be reserved only for heap.

The first patch enhances the error handling in processing the dts
chosen node. The second patch introduces the static heap and the
device tree parsing code. The third patch renames xenheap_* to
directmap_* for better readablity. The fourth patch adds the
implementation of the static heap pages handling in boot and heap
allocator for Arm.

Changes from v3 to v4:
- Change and update of wording in comments.
- Add the static heap feature in SUPPORT.md as tech preview.
- Also rename the setup_xenheap_mappings() function name and
  printed messages inside the function.
- Add Acked-by and reviewed-by.

Henry Wang (4):
  xen/arm: bootfdt: Make process_chosen_node() return int
  docs, xen/arm: Introduce static heap memory
  xen/arm: mm: Rename xenheap_* variable to directmap_*
  xen/arm: Handle static heap pages in boot and heap allocator

 SUPPORT.md                            |   7 ++
 docs/misc/arm/device-tree/booting.txt |  48 ++++++++
 xen/arch/arm/bootfdt.c                |  57 +++++++---
 xen/arch/arm/domain_build.c           |   8 +-
 xen/arch/arm/include/asm/config.h     |   2 +-
 xen/arch/arm/include/asm/mm.h         |  31 ++---
 xen/arch/arm/include/asm/setup.h      |  23 +++-
 xen/arch/arm/mm.c                     |  50 +++++----
 xen/arch/arm/setup.c                  | 156 ++++++++++++++++++++------
 9 files changed, 293 insertions(+), 89 deletions(-)