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We used to have one vmstate called "nullptr" which is only used to generate one-byte hint to say one pointer is NULL. Let's extend its use so that it will generate another byte to say the pointer is non-NULL. With that, the name of the info struct (or functions) do not apply anymore. Update correspondingly. Update analyze-migration.py to work with the new layout. No functional change intended yet. Reviewed-by: Fabiano Rosas <farosas@suse.de> Reviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@futurfusion.io> Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juraj Marcin <jmarcin@redhat.com> Link: https://lore.kernel.org/qemu-devel/20260401202844.673494-8-peterx@redhat.com Signed-off-by: Fabiano Rosas <farosas@suse.de>