[RFC PATCH V2 00/10] x86/Hyper-V: Add Dynamic memory hot-remove function

[lantianyu1986]

From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>

Hyper-V provides dynamic memory hot add/remove function.
Memory hot-add has already enabled in Hyper-V balloon driver.
Now add memory hot-remove function.

This patchset is based on the David Hildenbrand's "virtio-mem:
paravirtualized memory" RFC V4 version and use new interface
offline_and_remove_memory().
https://lkml.org/lkml/2019/12/12/681

Change since V1:
	- Split patch into small patch for review.
	- Convert ha_lock from spin lock to mutex.
	- Add a common work to handle all mem hot plug and
	balloon msg
	- Use offline_and_remove_memory() to offline and remove
	memory.

Tianyu Lan (10):
  mm/resource: Move child to new resource when release mem region.
  mm: expose is_mem_section_removable() symbol
  x86/Hyper-V/Balloon: Replace hot-add and balloon up works with a
    common work
  x86/Hyper-V/Balloon: Convert spin lock ha_lock to mutex
  x86/Hyper-V/Balloon: Avoid releasing ha_lock when traverse
    ha_region_list
  x86/Hyper-V/Balloon: Enable mem hot-remove capability
  x86/Hyper-V/Balloon: Handle mem hot-remove request
  x86/Hyper-V/Balloon: Handle request with non-aligned page number
  x86/Hyper-V/Balloon: Hot add mem in the gaps of hot add region
  x86/Hyper-V: Workaround Hyper-V unballoon msg bug

 drivers/hv/hv_balloon.c | 754 ++++++++++++++++++++++++++++++++++++++++--------
 kernel/resource.c       |  38 ++-
 mm/memory_hotplug.c     |   1 +
 3 files changed, 673 insertions(+), 120 deletions(-)

-- 
2.14.5