[Qemu-devel] [PATCH v2 0/8] Add basic "detach" support for dump-guest-memory

[Peter Xu <peterx@redhat.com>]

Sorry that this v2 series cannot be aligned with the v1 series. One
patch is added at the begining of the series to do some code
cleanups (also fix potential memory leak). Meanwhile, several new
patches are appended to the v1 series. Please see the change log for
more info.

v2 changes:
- fixed English errors [Drew]
- reordered the "detach" field, first make it optional, then make sure
  it's order is consistent [Drew, Fam]
- added doc for new detach flag [Eric]
- collected error msg even detached [Drew]
- added qmp event DUMP_COMPLETED to notify user [Eric, Fam]
- added "dump-query" QMP & HMP commands to query dump status [Eric]
- "stop" is not allowed when dump in background (also include
  "cont" and "dump-guest-memory") [Fam]
- added codes to calculate how many dump work finished, which could
  be queried from "dump-query" [Laszlo]
- added list to track all used MemoryRegion objects, also ref before
  use [Paolo]
- dump-guest-memory will be forbidden during incoming migrate [Paolo]
- taking rcu lock when collecting memory info [Paolo]

Test Done:
- QMP & HMP
  - test default dump (sync), work as usual
  - test detached dump, command return immediately. When dump
    finished, will receive event DUMP_COMPLETED with a message. 
  - test dump-query before/during/after dump
  - test kdump with zlib compression, w/ and w/o detach
- libvirt
  - test "virsh dump --memory-only" with default format and
    kdump-zlib format, work as usual

Peter Xu (8):
  dump-guest-memory: cleanup: removing dump_{error|cleanup}().
  dump-guest-memory: add "detach" flag for QMP/HMP interfaces.
  dump-guest-memory: add basic "detach" support.
  dump-guest-memory: add qmp event DUMP_COMPLETED
  dump-query: add "dump-query" command to query dump status
  dump-query: implement "status" of "dump-query" command.
  DumpState: adding total_size and written_size fields
  dump-query: make the percentage accurate.

 docs/qmp-events.txt             |  12 ++
 dump.c                          | 284 ++++++++++++++++++++++++++++++++--------
 hmp-commands.hx                 |  20 ++-
 hmp.c                           |  18 ++-
 hmp.h                           |   1 +
 include/qemu-common.h           |   8 ++
 include/sysemu/dump.h           |  28 ++++
 include/sysemu/memory_mapping.h |   8 ++
 memory_mapping.c                |  46 ++++++-
 qapi-schema.json                |  29 +++-
 qapi/event.json                 |  10 ++
 qmp-commands.hx                 |  35 ++++-
 qmp.c                           |  14 ++
 13 files changed, 450 insertions(+), 63 deletions(-)

-- 
2.4.3