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migration: simplify blockers

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Modify migrate_add_blocker and migrate_del_blocker to take an Error **
reason.  This allows migration to own the Error object, so that if
an error occurs in migrate_add_blocker, migration code can free the Error
and clear the client handle, simplifying client code.  It also simplifies
the migrate_del_blocker call site.

In addition, this is a pre-requisite for a proposed future patch that would
add a mode argument to migration requests to support live update, and
maintain a list of blockers for each mode.  A blocker may apply to a single
mode or to multiple modes, and passing Error** will allow one Error object
to be registered for multiple modes.

No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1697634216-84215-1-git-send-email-steven.sistare@oracle.com>
This commit is contained in:
Steve Sistare 2023-10-18 06:03:36 -07:00 • committed by Juan Quintela
parent 04131e0009
commit c8a7fc5179
33 changed files with 92 additions and 150 deletions
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4
dump/dump.c
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@ -111,7 +111,7 @@ static int dump_cleanup(DumpState *s)
qemu_mutex_unlock_iothread();
}
}
migrate_del_blocker(dump_migration_blocker);
migrate_del_blocker(&dump_migration_blocker);
return 0;
}
@ -2158,7 +2158,7 @@ void qmp_dump_guest_memory(bool paging, const char *file,
* Allows even for -only-migratable, but forbid migration during the
* process of dump guest memory.
*/
if (migrate_add_blocker_internal(dump_migration_blocker, errp)) {
if (migrate_add_blocker_internal(&dump_migration_blocker, errp)) {
/* Remember to release the fd before passing it over to dump state */
close(fd);
return;