[PATCH 0/8] migration fixes

[Fabiano Rosas]

This series contains fixes for the two currently know failures that
show up in migration tests plus a set of fixes for some theoretical
race conditions around QEMUFile handling.

Patch 1 addresses the issue found in the postcopy/preempt/plain test:
https://gitlab.com/qemu-project/qemu/-/issues/1886

Patch 7 fixes a rare crash during the postocpy/preempt/recovery/plain test:

  Thread 7 "return path" received signal SIGSEGV, Segmentation fault.
      0x00005555560e4893 in qemu_file_get_error_obj (f=0x0, errp=0x0) at 
../migration/qemu-file.c:154
      154         return f->last_error;

CI run: https://gitlab.com/farosas/qemu/-/pipelines/1008652837

Fabiano Rosas (7):
  migration: Fix possible race when setting rp_state.error
  migration: Fix possible races when shutting down the return path
  migration: Fix possible race when shutting down to_dst_file
  migration: Remove redundant cleanup of postcopy_qemufile_src
  migration: Consolidate return path closing code
  migration: Replace the return path retry logic
  migration: Move return path cleanup to main migration thread

Peter Xu (1):
  migration: Fix race that dest preempt thread close too early

 migration/migration.c    | 145 +++++++++++++++------------------------
 migration/migration.h    |  14 +++-
 migration/postcopy-ram.c |  38 +++++++++-
 3 files changed, 106 insertions(+), 91 deletions(-)

-- 
2.35.3