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migrate_start_postcopy: Command to trigger transition to postcopy

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Once postcopy is enabled (with migrate_set_capability), the migration
will still start on precopy mode.  To cause a transition into postcopy
the:

  migrate_start_postcopy

command must be issued.  Postcopy will start sometime after this
(when it's next checked in the migration loop).

Issuing the command before migration has started will error,
and issuing after it has finished is ignored.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2015-11-05 18:10:56 +00:00 • committed by Juan Quintela
parent eb59db53a4
commit 4886a1bcb7
7 changed files with 75 additions and 0 deletions
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3
include/migration/migration.h
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@ -127,6 +127,9 @@ struct MigrationState
int64_t xbzrle_cache_size;
int64_t setup_time;
int64_t dirty_sync_count;
/* Flag set once the migration has been asked to enter postcopy */
bool start_postcopy;
};
void process_incoming_migration(QEMUFile *f);