[Qemu-devel] [PATCH COLO-Frame v16 for-2.7 00/35] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service (FT)

[zhanghailiang <zhang.zhanghailiang@huawei.com>]

This is the 16th version of COLO (Still only support periodic checkpoint).

Here is only COLO frame part, you can get the whole codes from github:
https://github.com/coloft/qemu/commits/colo-v2.7-periodic-mode

There are little changes for this series except the netfilter releated part.

Patch status:
Unreviewed: patch 21, 32 ~ 35
Updated: patch 7, 13, 32 ~ 35

Cc: Jason Wang <jasowang@redhat.com>

TODO:
1. Checkpoint based on proxy in qemu
2. The capability of continuous FT
3. Optimize the VM's downtime during checkpoint

v16:
 - Fix compile broken due to missing osdep.h
 - Add reviewed-by tag for patch 27, 28, 29
 - Rename the COLO message send/receive helper function (patch 7, 13)
 - Simplify the codes by using some notifier helpers in QEMU (patch 32)
 - Remove the useless check in colo_add_buffer_filter() (patch 33)
 - Remove the previous patch 36, 37 which export filter_buffer_flush()
   to release the buffered packets for COLO, we simplify it by stopping
   buffer filter while doing checkpoint, which will flush the buffered
   packets by default. (patch 34)
v15:
 - Go on the shutdown process if encounter error while sending shutdown
   message to SVM. (patch 24)
 - Rename qemu_need_skip_netfilter to qemu_netfilter_can_skip and Remove
   some useless comment. (patch 31, Jason)
 - Call object_new_with_props() directly to add filter in
   colo_add_buffer_filter. (patch 34, Jason)
 - Re-implement colo_set_filter_status() based on COLOBufferFilters
   list. (patch 35)
 - Re-implement colo_flush_filter_packets() based on COLOBufferFilters
   list. (patch 37) 
v14:
 - Re-implement the network processing based on netfilter (Jason Wang)
 - Rename 'COLOCommand' to 'COLOMessage'. (Markus's suggestion)
 - Split two new patches (patch 27/28) from patch 29
 - Fix some other comments from Dave and Markus.

v13:
 - Refactor colo_*_cmd helper functions to use 'Error **errp' parameter
  instead of return value to indicate success or failure. (patch 10)
 - Remove the optional error message for COLO_EXIT event. (patch 25)
 - Use semaphore to notify colo/colo incoming loop that failover work is
   finished. (patch 26)
 - Move COLO shutdown related codes to colo.c file. (patch 28)
 - Fix memory leak bug for colo incoming loop. (new patch 31)
 - Re-use some existed helper functions to realize the process of
   saving/loading ram and device. (patch 32)
 - Fix some other comments from Dave and Markus.

zhanghailiang (35):
  configure: Add parameter for configure to enable/disable COLO support
  migration: Introduce capability 'x-colo' to migration
  COLO: migrate colo related info to secondary node
  migration: Integrate COLO checkpoint process into migration
  migration: Integrate COLO checkpoint process into loadvm
  COLO/migration: Create a new communication path from destination to
    source
  COLO: Implement colo checkpoint protocol
  COLO: Add a new RunState RUN_STATE_COLO
  QEMUSizedBuffer: Introduce two help functions for qsb
  COLO: Save PVM state to secondary side when do checkpoint
  COLO: Load PVM's dirty pages into SVM's RAM cache temporarily
  ram/COLO: Record the dirty pages that SVM received
  COLO: Load VMState into qsb before restore it
  COLO: Flush PVM's cached RAM into SVM's memory
  COLO: Add checkpoint-delay parameter for migrate-set-parameters
  COLO: synchronize PVM's state to SVM periodically
  COLO failover: Introduce a new command to trigger a failover
  COLO failover: Introduce state to record failover process
  COLO: Implement failover work for Primary VM
  COLO: Implement failover work for Secondary VM
  qmp event: Add COLO_EXIT event to notify users while exited from COLO
  COLO failover: Shutdown related socket fd when do failover
  COLO failover: Don't do failover during loading VM's state
  COLO: Process shutdown command for VM in COLO state
  COLO: Update the global runstate after going into colo state
  savevm: Introduce two helper functions for save/find loadvm_handlers
    entry
  migration/savevm: Add new helpers to process the different stages of
    loadvm
  migration/savevm: Export two helper functions for savevm process
  COLO: Separate the process of saving/loading ram and device state
  COLO: Split qemu_savevm_state_begin out of checkpoint process
  filter-buffer: Accept zero interval
  net: Add notifier/callback for netdev init
  COLO/filter: add each netdev a buffer filter
  COLO: manage the status of buffer filters for PVM
  COLO: Add block replication into colo process

 configure                     |  11 +
 docs/qmp-events.txt           |  16 +
 hmp-commands.hx               |  15 +
 hmp.c                         |  15 +
 hmp.h                         |   1 +
 include/exec/ram_addr.h       |   1 +
 include/migration/colo.h      |  42 +++
 include/migration/failover.h  |  33 ++
 include/migration/migration.h |  16 +
 include/migration/qemu-file.h |   3 +-
 include/net/filter.h          |   2 +
 include/net/net.h             |   3 +
 include/sysemu/sysemu.h       |   9 +
 migration/Makefile.objs       |   2 +
 migration/colo-comm.c         |  79 ++++
 migration/colo-failover.c     |  84 +++++
 migration/colo.c              | 855 ++++++++++++++++++++++++++++++++++++++++++
 migration/migration.c         |  90 ++++-
 migration/qemu-file-buf.c     |  61 +++
 migration/ram.c               | 175 ++++++++-
 migration/savevm.c            | 114 ++++--
 net/filter-buffer.c           |  12 -
 net/net.c                     |  12 +
 qapi-schema.json              | 104 ++++-
 qapi/event.json               |  15 +
 qmp-commands.hx               |  24 +-
 stubs/Makefile.objs           |   1 +
 stubs/migration-colo.c        |  55 +++
 trace-events                  |   8 +
 vl.c                          |  31 +-
 30 files changed, 1824 insertions(+), 65 deletions(-)
 create mode 100644 include/migration/colo.h
 create mode 100644 include/migration/failover.h
 create mode 100644 migration/colo-comm.c
 create mode 100644 migration/colo-failover.c
 create mode 100644 migration/colo.c
 create mode 100644 stubs/migration-colo.c

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1.8.3.1