[Qemu-devel] [RFC PATCH v3 00/30] replay additions

[Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>]

Accidentally sent draft version of patches to the mailing list.
Please consider this one as the correct one.

This set of patches includex fixes from Alex Bennée for fixing
BQL and replay locks after inventing the MTTCG. It also includes some
additional replay patches that makes this set of fixes working.
It is also fixes some vmstate creation (and loading) issues
in record/replay modes:
 - VM start/stop fixes in replay mode
 - overlay creation for blkreplay filter
 - fixes for vmstate save/load in record/replay mode
 - fixes for host clock vmstate
 - fixes for icount timers vmstate

There is also a set of helper scripts written by Alex Bennée
for debugging the record/replay code.

v3 changes:
 - removed upstreamed patches
 - fixed bug with recursive checkpoints
 - fixed bug with icount warp checkpoint

v2 changes:
 - updated lock/unlock logic (as suggested by Paolo Bonzini)
 - updated cpu execution loop to avoid races in setting/resetting exit request (as suggested by Paolo Bonzini)
 - minor changes

---

Alex Bennée (12):
      target/arm/arm-powertctl: drop BQL assertions
      cpus: push BQL lock to qemu_*_wait_io_event
      cpus: only take BQL for sleeping threads
      replay/replay.c: bump REPLAY_VERSION again
      replay/replay-internal.c: track holding of replay_lock
      replay: make locking visible outside replay code
      replay: push replay_mutex_lock up the call tree
      scripts/qemu-gdb: add simple tcg lock status helper
      util/qemu-thread-*: add qemu_lock, locked and unlock trace events
      scripts/analyse-locks-simpletrace.py: script to analyse lock times
      scripts/replay-dump.py: replay log dumper
      scripts/qemu-gdb/timers.py: new helper to dump timer state

Pavel Dovgalyuk (18):
      hpet: recover timer offset correctly
      cpu: flush TB cache when loading VMState
      This patch adds a condition before overwriting exception_index fields.
      block: implement bdrv_snapshot_goto for blkreplay
      blkreplay: create temporary overlay for underlaying devices
      replay: disable default snapshot for record/replay
      replay: fix processing async events
      replay: fixed replay_enable_events
      replay: fix save/load vm for non-empty queue
      replay: added replay log format description
      replay: make safe vmstop at record/replay
      replay: save prior value of the host clock
      icount: fixed saving/restoring of icount warp timers
      replay: don't destroy mutex at exit
      replay: check return values of fwrite
      replay: avoid recursive call of checkpoints
      replay: improve replay performance
      replay: don't process async events when warping the clock


 accel/kvm/kvm-all.c                  |    4 
 accel/tcg/cpu-exec.c                 |    5 -
 block/blkreplay.c                    |   73 ++++++++
 cpus-common.c                        |   13 +
 cpus.c                               |  184 +++++++++++++++-----
 docs/replay.txt                      |   91 ++++++++++
 exec.c                               |    1 
 hw/timer/hpet.c                      |   30 +++
 include/hw/compat.h                  |    6 +
 include/qemu/thread.h                |   19 ++
 include/qemu/timer.h                 |   14 ++
 include/sysemu/replay.h              |   22 ++
 migration/savevm.c                   |   13 +
 replay/replay-char.c                 |   21 +-
 replay/replay-events.c               |   30 +--
 replay/replay-internal.c             |   48 +++++
 replay/replay-internal.h             |    9 +
 replay/replay-snapshot.c             |    9 +
 replay/replay-time.c                 |   10 +
 replay/replay.c                      |   75 ++++++--
 scripts/analyse-locks-simpletrace.py |   99 +++++++++++
 scripts/qemu-gdb.py                  |    4 
 scripts/qemugdb/tcg.py               |   46 +++++
 scripts/qemugdb/timers.py            |   54 ++++++
 scripts/replay-dump.py               |  308 ++++++++++++++++++++++++++++++++++
 stubs/replay.c                       |   16 ++
 target/arm/arm-powerctl.c            |    8 -
 target/i386/hax-all.c                |    2 
 util/main-loop.c                     |   17 +-
 util/qemu-thread-posix.c             |   21 +-
 util/qemu-timer.c                    |   12 +
 util/trace-events                    |    7 -
 vl.c                                 |   12 +
 33 files changed, 1112 insertions(+), 171 deletions(-)
 create mode 100755 scripts/analyse-locks-simpletrace.py
 create mode 100644 scripts/qemugdb/tcg.py
 create mode 100644 scripts/qemugdb/timers.py
 create mode 100755 scripts/replay-dump.py

-- 
Pavel Dovgalyuk