migration: Introduce capability 'x-colo' to migration
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: Nzhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: NLi Zhijian <lizhijian@cn.fujitsu.com> Signed-off-by: NGonglei <arei.gonglei@huawei.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NAmit Shah <amit.shah@redhat.com> Signed-off-by: NAmit Shah <amit@amitshah.net>
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include/migration/colo.h
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migration/colo.c
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stubs/migration-colo.c
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