[PATCH 00/11] migration: Some enhancements and cleanups for 10.1

[Peter Xu <peterx@redhat.com>]

The series is based on a small patch from Yanfei Xu here:

Based-on: <20250514115827.3216082-1-yanfei.xu@bytedance.com>
https://lore.kernel.org/r/20250514115827.3216082-1-yanfei.xu@bytedance.com

This is a series that collected many of either enhancements or cleanups I
got for QEMU 10.1, which almost came from when working on the last patch.

The last patch, which is a oneliner, can further reduce 10% postcopy page
fault latency with preempt mode enabled.

      Before: 268.00us (+-1.87%)
      After:  232.67us (+-2.01%)

The patch layout is as following:

Patch 1:         A follow up of HMP change for "info migrate", per
                 suggestion from Dave
Patch 2:         Yet another HMP fix for blocktime displays
Patch 3-10:      Cleanups everywhere, especially please take a look at
                 patch 10 which changes the core switchover decision logic
Patch 11:        The one-liner optimization

Comments welcomed, thanks.

Peter Xu (11):
  migration/hmp: Reorg "info migrate" once more
  migration/hmp: Fix postcopy-blocktime per-vCPU results
  migration/docs: Move docs for postcopy blocktime feature
  migration/bg-snapshot: Do not check for SKIP in iterator
  migration: Drop save_live_complete_postcopy hook
  migration: Rename save_live_complete_precopy to save_complete
  migration: qemu_savevm_complete*() helpers
  migration/ram: One less indent for ram_find_and_save_block()
  migration/ram: Add tracepoints for ram_save_complete()
  migration: Rewrite the migration complete detect logic
  migration/postcopy: Avoid clearing dirty bitmap for postcopy too

 docs/devel/migration/postcopy.rst | 36 +++++++-------
 include/migration/register.h      | 26 ++++------
 hw/ppc/spapr.c                    |  2 +-
 hw/s390x/s390-stattrib.c          |  2 +-
 hw/vfio/migration.c               |  2 +-
 migration/block-dirty-bitmap.c    |  3 +-
 migration/migration-hmp-cmds.c    | 82 ++++++++++++++++--------------
 migration/migration.c             | 61 ++++++++++++++++-------
 migration/ram.c                   | 32 +++++++-----
 migration/savevm.c                | 83 +++++++++++++++++--------------
 migration/trace-events            |  1 +
 11 files changed, 185 insertions(+), 145 deletions(-)

-- 
2.49.0