This set of patches includes several fixes for replay and adds network record/replay for network devices. It also makes possible saving/restoring vmstate in replay mode.
Record and replay for network interactions is performed with the network filter. Each backend must have its own instance of the replay filter as follows: -netdev user,id=net1 -device rtl8139,netdev=net1 -object filter-replay,id=replay,netdev=net1 This patches add overlay option for blkreplay block driver. Using persistent overlay file allows saving and reloading VM snapshots in replay mode. Replay mechanism automatically creates one snapshot named 'replay_init' to allow rewinding execution while replaying. Overlay file may be specified as follows: -drive file=disk.qcow,if=none,id=img-direct -drive driver=blkreplay,if=none,image=img-direct,overlay=overlay.qcow2,id=img-blkreplay -device ide-hd,drive=img-blkreplay This set of patches includes fixes and additions for icount and record/replay implementation: - VM start/stop in replay mode - Network interaction record/replay - overlay option for blkreplay filter - rrsnapshot option for record/replay - vmstate fix for integratorcp ARM platform v3 changes: - Added rrsnapshot option for specifying the initial snapshot name (as suggested by Paolo Bonzini) - Minor changes --- Pavel Dovgalyuk (8): record/replay: add network support block: set snapshot option for block devices in blkreplay module block: don't make snapshots for filters replay: save/load initial state replay: move internal data to the structure replay: vmstate for replay module replay: allow replay stopping and restarting integratorcp: adding vmstate for save/restore block/blkreplay.c | 132 +++++++++++++++++++++++++++++++++++++++++++--- block/snapshot.c | 3 + cpus.c | 1 docs/replay.txt | 34 ++++++++++++ hw/arm/integratorcp.c | 62 ++++++++++++++++++++++ include/sysemu/replay.h | 22 ++++++++ net/Makefile.objs | 1 net/filter-replay.c | 90 +++++++++++++++++++++++++++++++ qemu-options.hx | 8 ++- replay/Makefile.objs | 2 + replay/replay-events.c | 21 +++++++ replay/replay-internal.c | 19 +++---- replay/replay-internal.h | 36 +++++++++++-- replay/replay-net.c | 110 ++++++++++++++++++++++++++++++++++++++ replay/replay-snapshot.c | 72 +++++++++++++++++++++++++ replay/replay-time.c | 2 - replay/replay.c | 25 ++++++--- stubs/replay.c | 5 ++ vl.c | 14 ++++- 19 files changed, 618 insertions(+), 41 deletions(-) create mode 100644 net/filter-replay.c create mode 100644 replay/replay-net.c create mode 100644 replay/replay-snapshot.c -- Pavel Dovgalyuk