New VMstate save/load infrastructure
This patch introduces VMState infrastructure, to convert the save/load functions of devices to a table approach. This new approach has the following advantages: - it is type-safe - you can't have load/save functions out of sync - will allows us to have new interesting commands, like dump <device>, that shows all its internal state. - Just now, the only added type is arrays, but we can add structures. - Uses old load_state() function for loading old state. Signed-off-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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