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migration: Introduce capability 'x-colo' to migration

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We add helper function colo_supported() to indicate whether
colo is supported or not, with which we use to control whether or not
showing 'x-colo' string to users, they can use qmp command
'query-migrate-capabilities' or hmp command 'info migrate_capabilities'
to learn if colo is supported.

The default value for COLO (COarse-Grain LOck Stepping) is disabled.

Cc: Juan Quintela <quintela@redhat.com>
Cc: Amit Shah <amit.shah@redhat.com>
Cc: Eric Blake <eblake@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
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>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Amit Shah <amit@amitshah.net>
This commit is contained in:
zhanghailiang 2016-10-27 14:42:52 +08:00 • committed by Amit Shah
parent 5b2ecabaea
commit 35a6ed4f71
9 changed files with 89 additions and 2 deletions
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1
migration/Makefile.objs
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@ -1,5 +1,6 @@
common-obj-y += migration.o socket.o fd.o exec.o
common-obj-y += tls.o
common-obj-$(CONFIG_COLO) += colo.o
common-obj-y += vmstate.o
common-obj-y += qemu-file.o
common-obj-y += qemu-file-channel.o