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| author | zhanghailiang <zhang.zhanghailiang@huawei.com> | 2016-10-27 14:42:57 +0800 |
|---|---|---|
| committer | Amit Shah <amit@amitshah.net> | 2016-10-30 15:17:39 +0530 |
| commit | 4f97558e100f66f953ba7576b0ced146e6846997 (patch) | |
| tree | 9291afc621c00f6d1f66d41ac2e59a0ce76b14d5 /qapi-schema.json | |
| parent | 56ba83d2a871a28ec18b8bb0fcec74ed02bbe06c (diff) | |
| download | qemu-4f97558e100f66f953ba7576b0ced146e6846997.zip | |
COLO: Introduce checkpointing protocol
We need communications protocol of user-defined to control
the checkpointing process.
The new checkpointing request is started by Primary VM,
and the interactive process like below:
Checkpoint synchronizing points:
Primary Secondary
initial work
'checkpoint-ready' <-------------------- @
'checkpoint-request' @ -------------------->
Suspend (Only in hybrid mode)
'checkpoint-reply' <-------------------- @
Suspend&Save state
'vmstate-send' @ -------------------->
Send state Receive state
'vmstate-received' <-------------------- @
Release packets Load state
'vmstate-load' <-------------------- @
Resume Resume (Only in hybrid mode)
Start Comparing (Only in hybrid mode)
NOTE:
1) '@' who sends the message
2) Every sync-point is synchronized by two sides with only
one handshake(single direction) for low-latency.
If more strict synchronization is required, a opposite direction
sync-point should be added.
3) Since sync-points are single direction, the remote side may
go forward a lot when this side just receives the sync-point.
4) For now, we only support 'periodic' checkpoint, for which
the Secondary VM is not running, later we will support 'hybrid' mode.
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Cc: Eric Blake <eblake@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Amit Shah <amit@amitshah.net>
Diffstat (limited to 'qapi-schema.json')
| -rw-r--r-- | qapi-schema.json | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/qapi-schema.json b/qapi-schema.json index 8b212152a3..cafada86e6 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -787,6 +787,31 @@ { 'command': 'migrate-start-postcopy' } ## +# @COLOMessage +# +# The message transmission between Primary side and Secondary side. +# +# @checkpoint-ready: Secondary VM (SVM) is ready for checkpointing +# +# @checkpoint-request: Primary VM (PVM) tells SVM to prepare for checkpointing +# +# @checkpoint-reply: SVM gets PVM's checkpoint request +# +# @vmstate-send: VM's state will be sent by PVM. +# +# @vmstate-size: The total size of VMstate. +# +# @vmstate-received: VM's state has been received by SVM. +# +# @vmstate-loaded: VM's state has been loaded by SVM. +# +# Since: 2.8 +## +{ 'enum': 'COLOMessage', + 'data': [ 'checkpoint-ready', 'checkpoint-request', 'checkpoint-reply', + 'vmstate-send', 'vmstate-size', 'vmstate-received', + 'vmstate-loaded' ] } + # @MouseInfo: # # Information about a mouse device. |