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Add wrappers and handlers for sending/receiving the postcopy-ram migration messages.

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The state of the postcopy process is managed via a series of messages;
   * Add wrappers and handlers for sending/receiving these messages
   * Add state variable that track the current state of postcopy

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2015-11-05 18:10:52 +00:00 • committed by Juan Quintela
parent 53dd370ced
commit 093e3c4296
5 changed files with 330 additions and 0 deletions
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20
migration/migration.c
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@ -57,6 +57,13 @@ static NotifierList migration_state_notifiers =
static bool deferred_incoming;
/*
* Current state of incoming postcopy; note this is not part of
* MigrationIncomingState since it's state is used during cleanup
* at the end as MIS is being freed.
*/
static PostcopyState incoming_postcopy_state;
/* When we add fault tolerance, we could have several
migrations at once. For now we don't need to add
dynamic creation of migration */
@ -284,6 +291,7 @@ static void process_incoming_migration_co(void *opaque)
int ret;
migration_incoming_state_new(f);
postcopy_state_set(POSTCOPY_INCOMING_NONE);
migrate_generate_event(MIGRATION_STATUS_ACTIVE);
ret = qemu_loadvm_state(f);
@ -1367,3 +1375,15 @@ void migrate_fd_connect(MigrationState *s)
qemu_thread_create(&s->thread, "migration", migration_thread, s,
QEMU_THREAD_JOINABLE);
}
PostcopyState postcopy_state_get(void)
{
return atomic_mb_read(&incoming_postcopy_state);
}
/* Set the state and return the old state */
PostcopyState postcopy_state_set(PostcopyState new_state)
{
return atomic_xchg(&incoming_postcopy_state, new_state);
}