[0/7] migration: Fix s390 regressions + migration script

Message

Fabiano Rosas Jan. 7, 2025, 7:50 p.m. UTC

Hi,

The situation that broke the last migration PR was:

1) emitting of JSON data by QEMU for
   VMSTATE_ARRAY_OF_POINTER_TO_STRUCT when NULL pointers are present
   has been broken for a while;

2) parsing of s390x migration stream by analyze-script.py has been
   broken for a while;

   (there's indications that it worked on s390x hosts, I'm assuming due
   to byte order coincidences)

3) s390x CSS migration has been broken for a while;

The s390x CSS migration uses VMSTATE_ARRAY_OF_POINTER_TO_STRUCT with
NULL pointers, triggering #1, but hidden due to #2 on TCG hosts and
due to #3 overall.

- patches 1: just to make rebase easier
- patches 2-3: cleanups
- patch 4: fixes #2
- patches 5-6: fix #1
- patch 7: fixes #3

CI run: https://gitlab.com/farosas/qemu/-/pipelines/1615060320

Fabiano Rosas (6):
  migration: Add more error handling to analyze-migration.py
  migration: Remove unused argument in vmsd_desc_field_end
  migration: Document the effect of vmstate_info_nullptr
  migration: Fix parsing of s390 stream
  migration: Fix arrays of pointers in JSON writer
  s390x: Fix CSS migration

Peter Xu (1):
  migration: Dump correct JSON format for nullptr replacement

 hw/s390x/s390-virtio-ccw.c   |   2 +-
 migration/vmstate-types.c    |   6 ++
 migration/vmstate.c          | 151 ++++++++++++++++++++++++++++-------
 scripts/analyze-migration.py | 111 +++++++++++++++++--------
 4 files changed, 209 insertions(+), 61 deletions(-)