Hello,

This series implements a new PDX compression algorithm to cope with the
spare memory maps found on the Intel Sapphire/Granite Rapids.

Patches 1 to 6 prepare the existing code to make it easier to introduce
a new PDX compression, including generalizing the initialization and
setup functions and adding a unit test for PDX compression.

Patch 7 introduce the new compression.  The new compression is only
enabled by default on x86, other architectures are left with their
previous defaults.

Finally patch 8 optimizes one x86 loop that was iterating over pfn
ranges to instead use pdx values.

Thanks, Roger.

Roger Pau Monne (8):
  kconfig: turn PDX compression into a choice
  pdx: provide a unified set of unit functions
  pdx: introduce command line compression toggle
  pdx: allow per-arch optimization of PDX conversion helpers
  test/pdx: add PDX compression unit tests
  pdx: move some helpers in preparation for new compression
  pdx: introduce a new compression algorithm based on region offsets
  x86/mm: adjust loop in arch_init_memory() to iterate over the PDX
    space

 CHANGELOG.md                           |   3 +
 docs/misc/xen-command-line.pandoc      |   9 +
 tools/tests/Makefile                   |   1 +
 tools/tests/pdx/.gitignore             |   3 +
 tools/tests/pdx/Makefile               |  50 +++
 tools/tests/pdx/harness.h              | 103 ++++++
 tools/tests/pdx/test-pdx.c             | 271 ++++++++++++++++
 xen/arch/arm/include/asm/Makefile      |   1 +
 xen/arch/arm/setup.c                   |  36 +--
 xen/arch/ppc/include/asm/Makefile      |   1 +
 xen/arch/riscv/include/asm/Makefile    |   1 +
 xen/arch/x86/include/asm/cpufeatures.h |   1 +
 xen/arch/x86/include/asm/pdx.h         |  75 +++++
 xen/arch/x86/mm.c                      |  11 +-
 xen/arch/x86/srat.c                    |  30 +-
 xen/common/Kconfig                     |  37 ++-
 xen/common/pdx.c                       | 429 +++++++++++++++++++++++--
 xen/include/asm-generic/pdx.h          |  24 ++
 xen/include/xen/pdx.h                  | 202 ++++++++----
 19 files changed, 1157 insertions(+), 131 deletions(-)
 create mode 100644 tools/tests/pdx/.gitignore
 create mode 100644 tools/tests/pdx/Makefile
 create mode 100644 tools/tests/pdx/harness.h
 create mode 100644 tools/tests/pdx/test-pdx.c
 create mode 100644 xen/arch/x86/include/asm/pdx.h
 create mode 100644 xen/include/asm-generic/pdx.h

-- 
2.49.0