[PATCH 0/6] dax/hmem, cxl: Coordinate Soft Reserved handling with CXL

[Smita Koralahalli]

This series aims to address long-standing conflicts between dax_hmem and
CXL when handling Soft Reserved memory ranges.

I have considered adding support for DAX_CXL_MODE_REGISTER, but I do not
yet have a solid approach. Since this came up in discussion yesterday,
I am sending the current work and would appreciate inputs on how best to
handle the DAX_CXL_MODE_REGISTER case.

Reworked from Dan's patch:
https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/patch/?id=ab70c6227ee6165a562c215d9dcb4a1c55620d5d

Previous work:
https://lore.kernel.org/all/20250715180407.47426-1-Smita.KoralahalliChannabasappa@xxxxxxx/

Smita Koralahalli (6):
  dax/hmem, e820, resource: Defer Soft Reserved registration until hmem
    is ready
  dax/hmem: Request cxl_acpi and cxl_pci before walking Soft Reserved
    ranges
  dax/hmem, cxl: Tighten dependencies on DEV_DAX_CXL and dax_hmem
  dax/hmem: Defer Soft Reserved overlap handling until CXL region
    assembly completes
  dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree
  cxl/region, dax/hmem: Guard CXL DAX region creation and tighten HMEM
    deps

 arch/x86/kernel/e820.c    |   2 +-
 drivers/cxl/core/region.c |   4 +-
 drivers/dax/Kconfig       |   3 +
 drivers/dax/hmem/device.c |   4 +-
 drivers/dax/hmem/hmem.c   | 137 +++++++++++++++++++++++++++++++++++---
 include/linux/ioport.h    |  24 +++++++
 kernel/resource.c         |  73 +++++++++++++++++---
 7 files changed, 222 insertions(+), 25 deletions(-)

-- 
2.17.1