[PATCH v2 0/7] migration: Better error handling in return path thread

[Peter Xu <peterx@redhat.com>]

v2:
- Patch "migration: Provide explicit error message for file shutdowns"
  - Touched up qapi doc [Fabiano]
  - Added Bugzilla link to commit which I didn't even notice that I was
    fixing a bug.. but rightfully pointed out by Laszlo.
  - Moved it to the 1st patch because it fixes a bug, please consider
    review and merge it earlier.

This is a small series that reworks error handling of postcopy return path
threads.

We used to contain a bunch of error_report(), converting them into
error_setg() properly and deliver any of those errors to migration generic
error reports (via migrate_set_error()).  Then these errors can also be
observed in query-migrate after postcopy is paused.

Dropped the return-path specific error reporting: mark_source_rp_bad(),
because it's a duplication if we can always use migrate_set_error().

Please have a look, thanks.

Peter Xu (7):
  migration: Display error in query-migrate irrelevant of status
  migration: Let migrate_set_error() take ownership
  migration: Introduce migrate_has_error()
  migration: Refactor error handling in source return path
  migration: Deliver return path file error to migrate state too
  qemufile: Always return a verbose error
  migration: Provide explicit error message for file shutdowns

 qapi/migration.json      |   5 +-
 migration/migration.h    |   8 +-
 migration/ram.h          |   5 +-
 migration/channel.c      |   1 -
 migration/migration.c    | 168 +++++++++++++++++++++++----------------
 migration/multifd.c      |  10 +--
 migration/postcopy-ram.c |   1 -
 migration/qemu-file.c    |  20 ++++-
 migration/ram.c          |  42 +++++-----
 migration/trace-events   |   2 +-
 10 files changed, 149 insertions(+), 113 deletions(-)

-- 
2.41.0