[PATCH ndctl v1 0/8] daxctl: Add device align and range mapping allocation

[Joao Martins <joao.m.martins@oracle.com>]

Hey,

This series builds on top of this one[0] and does the following improvements
to the Soft-Reserved subdivision:

 1) Support for {create,reconfigure}-device for selecting @align (hugepage size).
 Here we add a '-a|--align 4K|2M|1G' option to the existing commands;

 2) Listing improvements for device alignment and mappings;
 Note: Perhaps it is better to hide the mappings by default, and only
       print with -v|--verbose. This would align with ndctl, as the mappings
       info can be quite large.

 3) Allow creating devices from selecting ranges. This allows to keep the
   same GPA->HPA mapping as before we kexec the hypervisor with running guests:

   daxctl list -d dax0.1 > /var/log/dax0.1.json
   kexec -d -l bzImage
   systemctl kexec
   daxctl create -u --restore /var/log/dax0.1.json

   The JSON was what I though it would be easier for an user, given that it is
   the data format daxctl outputs. Alternatives could be adding multiple:
   	--mapping <pgoff>:<start>-<end>

   But that could end up in a gigantic line and a little more
   unmanageable I think.

This series requires this series[0] on top of Dan's patches[1]:

 [0] https://lore.kernel.org/linux-nvdimm/20200716172913.19658-1-joao.m.martins@oracle.com/
 [1] https://lore.kernel.org/linux-nvdimm/159457116473.754248.7879464730875147365.stgit@dwillia2-desk3.amr.corp.intel.com/

The only TODO here is docs and improving tests to validate mappings, and test
the restore path.

Suggestions/comments are welcome.

	Joao

Joao Martins (8):
  daxctl: add daxctl_dev_{get,set}_align()
  util/json: Print device align
  daxctl: add align support in reconfigure-device
  daxctl: add align support in create-device
  libdaxctl: add mapping iterator APIs
  daxctl: include mappings when listing
  libdaxctl: add daxctl_dev_set_mapping()
  daxctl: Allow restore devices from JSON metadata

 daxctl/device.c                | 154 +++++++++++++++++++++++++++++++++++++++--
 daxctl/lib/libdaxctl-private.h |   9 +++
 daxctl/lib/libdaxctl.c         | 152 +++++++++++++++++++++++++++++++++++++++-
 daxctl/lib/libdaxctl.sym       |   9 +++
 daxctl/libdaxctl.h             |  16 +++++
 util/json.c                    |  63 ++++++++++++++++-
 util/json.h                    |   3 +
 7 files changed, 396 insertions(+), 10 deletions(-)

-- 
1.8.3.1
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