memory: pass EventNotifier, not eventfd

Under Win32, EventNotifiers will not have event_notifier_get_fd, so we
cannot call it in common code such as hw/virtio-pci.c.  Pass a pointer to
the notifier, and only retrieve the file descriptor in kvm-specific code.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/memory.h b/memory.h
index 740c48e..bd1bbae 100644
--- a/memory.h
+++ b/memory.h
@@ -198,9 +198,9 @@
     void (*log_global_start)(MemoryListener *listener);
     void (*log_global_stop)(MemoryListener *listener);
     void (*eventfd_add)(MemoryListener *listener, MemoryRegionSection *section,
-                        bool match_data, uint64_t data, int fd);
+                        bool match_data, uint64_t data, EventNotifier *e);
     void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,
-                        bool match_data, uint64_t data, int fd);
+                        bool match_data, uint64_t data, EventNotifier *e);
     /* Lower = earlier (during add), later (during del) */
     unsigned priority;
     MemoryRegion *address_space_filter;
@@ -541,7 +541,7 @@
                                unsigned size,
                                bool match_data,
                                uint64_t data,
-                               int fd);
+                               EventNotifier *e);
 
 /**
  * memory_region_del_eventfd: Cancel an eventfd.
@@ -561,7 +561,8 @@
                                unsigned size,
                                bool match_data,
                                uint64_t data,
-                               int fd);
+                               EventNotifier *e);
+
 /**
  * memory_region_add_subregion: Add a subregion to a container.
  *