[PATCH v2 0/7] implement "memmap on memory" feature on s390

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Hi All,

The patch series implements "memmap on memory" feature on s390.

Patch 1 introduces new mhp_flag MHP_OFFLINE_INACCESSIBLE to mark
memory as not accessible until memory hotplug online phase begins.

Patch 2 avoids page_init_poison() on memmap during mhp addition phase,
when mhp_flag MHP_OFFLINE_INACCESSIBLE is passed over from add_memory()

notifiers to prepare the transition of memory to and from a physically
accessible state. This enhancement is crucial for implementing the
"memmap on memory" feature for s390 in a subsequent patch.

Patches 4 allocates vmemmap pages from self-contained memory range for
s390. It allocates memory map (struct pages array) from the hotplugged
memory range, rather than using system memory by passing altmap to
vmemmap functions.

Patch 5 removes unhandled memory notifier types on s390.

notifiers on s390. MEM_PREPARE_ONLINE memory notifier makes memory block
physical accessible via sclp assign command. The notifier ensures
self-contained memory maps are accessible and hence enabling the "memmap
on memory" on s390. MEM_FINISH_OFFLINE memory notifier shifts the memory
block to an inaccessible state via sclp unassign command

Patch 7 finally enables MHP_MEMMAP_ON_MEMORY on s390

These patches are rebased on top of three fixes:
mm: use vmem_altmap code without CONFIG_ZONE_DEVICE
mm/memory_hotplug: fix error handling in add_memory_resource()
mm/memory_hotplug: add missing mem_hotplug_lock

* Fixes are integrated and hence removed from this patch series
Suggestions from David:
* Add new flag MHP_OFFLINE_INACCESSIBLE to avoid accessing memory
  during memory hotplug addition phase.
* Avoid page_init_poison() on memmap during mhp addition phase, when
  MHP_OFFLINE_INACCESSIBLE mhp_flag is passed in add_memory().
* Do not skip add_pages() in arch_add_memory(). Similarly, remove
  similar hacks in arch_remove_memory(). 
  new memory notifiers.
* Rearrange removal of unused s390 memory notifier.
* Necessary commit messages changes.

Thank you

Sumanth Korikkar (7):
  mm/memory_hotplug: introduce mhp_flag MHP_OFFLINE_INACCESSIBLE
  mm/memory_hotplug: avoid poisoning memmap during mhp addition phase
  mm/memory_hotplug: introduce MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE
  s390/mm: allocate vmemmap pages from self-contained memory range
  s390/sclp: remove unhandled memory notifier type
  s390/mm: implement MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers
  s390: enable MHP_MEMMAP_ON_MEMORY

 arch/s390/Kconfig              |  1 +
 arch/s390/mm/init.c            |  3 --
 arch/s390/mm/vmem.c            | 62 +++++++++++++++++++---------------
 drivers/base/memory.c          | 23 +++++++++++--
 drivers/s390/char/sclp_cmd.c   | 31 ++++++++++++-----
 include/linux/memory.h         |  3 ++
 include/linux/memory_hotplug.h | 12 ++++++-
 include/linux/memremap.h       |  1 +
 mm/memory_hotplug.c            | 30 ++++++++++++++--
 mm/sparse.c                    |  3 +-
 10 files changed, 124 insertions(+), 45 deletions(-)


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