migration: add comment for TYPE_MIGRATE
It'll be strange that the migration object inherits TYPE_DEVICE. Add some explanations to it. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1498634144-26508-1-git-send-email-peterx@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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@ -2046,6 +2046,14 @@ static void migration_instance_init(Object *obj)
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static const TypeInfo migration_type = {
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.name = TYPE_MIGRATION,
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/*
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* NOTE: "migration" itself is not really a device. We used
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* TYPE_DEVICE here only to leverage some existing QDev features
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* like "-global" properties, and HW_COMPAT_* fields (which are
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* finally applied as global properties as well). If one day the
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* global property feature can be migrated from QDev to QObject in
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* general, then we can switch to QObject as well.
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*/
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.parent = TYPE_DEVICE,
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.class_init = migration_class_init,
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.class_size = sizeof(MigrationClass),
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