We need get more migration thread information to support
migration pin, especially thread name and its pid. Add an
qmp interface to query migration threads information.

v2 of:
https://lists.nongnu.org/archive/html/qemu-devel/2023-01/msg04618.html

diff to v2:
* remove the event that report thread name
* modify the qmp interface, now it doesn't need thread name and
  return with all the migration threads information we saved

Jiang Jiacheng (2):
  migration: Introduce interface query-migrationthreads
  migration: save/delete migration thread info

 migration/meson.build  |  1 +
 migration/migration.c  |  5 ++++
 migration/multifd.c    |  5 ++++
 migration/threadinfo.c | 54 ++++++++++++++++++++++++++++++++++++++++++
 migration/threadinfo.h | 28 ++++++++++++++++++++++
 qapi/migration.json    | 29 +++++++++++++++++++++++
 6 files changed, 122 insertions(+)
 create mode 100644 migration/threadinfo.c
 create mode 100644 migration/threadinfo.h

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2.33.0