Re: [Qemu-devel] [PATCH v2 00/10] replay additions

[Paolo Bonzini]

On 15/09/2016 11:00, Pavel Dovgalyuk wrote:
> 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:
>  - Enabling VM start/stop in replay mode
>  - Adding network interaction record/replay
>  - Adding overlay option for blkreplay filter
>  - Fixes of the vmstate for several virtual devices

Queued patches 8 and 9.  Patch 9 will break migration from 2.8 to 2.7,
unfortunately, same as what happened for parallel in the past.

Paolo

> ---
> 
> Pavel Dovgalyuk (10):
>       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
>       kvmvapic: fix state change handler
>       pcspk: adding vmstate for save/restore
>       integratorcp: adding vmstate for save/restore
> 
> 
>  block/blkreplay.c        |  132 
> +++++++++++++++++++++++++++++++++++++++++++---
>  block/snapshot.c         |    3 +
>  cpus.c                   |    1 
>  docs/replay.txt          |   22 ++++++++
>  hw/arm/integratorcp.c    |   62 ++++++++++++++++++++++
>  hw/audio/pcspk.c         |   17 +++++-
>  hw/i386/kvmvapic.c       |    1 
>  include/sysemu/replay.h  |   26 +++++++++
>  net/Makefile.objs        |    1 
>  net/filter-replay.c      |   90 +++++++++++++++++++++++++++++++
>  replay/Makefile.objs     |    2 +
>  replay/replay-events.c   |   21 +++++++
>  replay/replay-internal.c |   19 +++----
>  replay/replay-internal.h |   26 +++++++--
>  replay/replay-net.c      |  110 ++++++++++++++++++++++++++++++++++++++
>  replay/replay-snapshot.c |   72 +++++++++++++++++++++++++
>  replay/replay-time.c     |    2 -
>  replay/replay.c          |   17 +++---
>  stubs/replay.c           |    5 ++
>  vl.c                     |    9 ++-
>  20 files changed, 599 insertions(+), 39 deletions(-)
>  create mode 100644 net/filter-replay.c
>  create mode 100644 replay/replay-net.c
>  create mode 100644 replay/replay-snapshot.c
>