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Let's track how many memslots are required by plugged memory devices and how many are currently actually getting used by plugged memory devices. "required - used" is the number of reserved memslots. For now, the number of used and required memslots is always equal, and there are no reservations. This is a preparation for memory devices that want to dynamically consume memslots after initially specifying how many they require -- where we'll end up with reserved memslots. To track the number of used memslots, create a new address space for our device memory and register a memory listener (add/remove) for that address space. Message-ID: <20230926185738.277351-9-david@redhat.com> Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com>