struct rcu_head rcu;
char *name;
MemoryRegion *root;
+ int ref_count;
+ bool malloced;
/* Accessed via RCU. */
struct FlatView *current_map;
*/
void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name);
+/**
+ * address_space_init_shareable: return an address space for a memory region,
+ * creating it if it does not already exist
+ *
+ * @root: a #MemoryRegion that routes addresses for the address space
+ * @name: an address space name. The name is only used for debugging
+ * output.
+ *
+ * This function will return a pointer to an existing AddressSpace
+ * which was initialized with the specified MemoryRegion, or it will
+ * create and initialize one if it does not already exist. The ASes
+ * are reference-counted, so the memory will be freed automatically
+ * when the AddressSpace is destroyed via address_space_destroy.
+ */
+AddressSpace *address_space_init_shareable(MemoryRegion *root,
+ const char *name);
/**
* address_space_destroy: destroy an address space
{
memory_region_ref(root);
memory_region_transaction_begin();
+ as->ref_count = 1;
as->root = root;
+ as->malloced = false;
as->current_map = g_new(FlatView, 1);
flatview_init(as->current_map);
as->ioeventfd_nb = 0;
static void do_address_space_destroy(AddressSpace *as)
{
MemoryListener *listener;
+ bool do_free = as->malloced;
address_space_destroy_dispatch(as);
g_free(as->name);
g_free(as->ioeventfds);
memory_region_unref(as->root);
+ if (do_free) {
+ g_free(as);
+ }
+}
+
+AddressSpace *address_space_init_shareable(MemoryRegion *root, const char *name)
+{
+ AddressSpace *as;
+
+ QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
+ if (root == as->root && as->malloced) {
+ as->ref_count++;
+ return as;
+ }
+ }
+
+ as = g_malloc0(sizeof *as);
+ address_space_init(as, root, name);
+ as->malloced = true;
+ return as;
}
void address_space_destroy(AddressSpace *as)
{
MemoryRegion *root = as->root;
+ as->ref_count--;
+ if (as->ref_count) {
+ return;
+ }
/* Flush out anything from MemoryListeners listening in on this */
memory_region_transaction_begin();
as->root = NULL;