+ void (*eventfd_add)(MemoryListener *listener, MemoryRegionSection *section,
+ bool match_data, uint64_t data, int fd);
+ void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,
+ bool match_data, uint64_t data, int fd);
+ /* Lower = earlier (during add), later (during del) */
+ unsigned priority;
+ MemoryRegion *address_space_filter;
+ QTAILQ_ENTRY(MemoryListener) link;