ramblocks: No more being lazy about duplicate names

Now that we have a working qemu_ram_free() and the primary runtime
user of it has been updated, don't be lenient about duplicate id strings.
We also shouldn't need to create them ondemand at the target.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

arch_init.c

@@ -369,8 +369,9 @@ int ram_load(QEMUFile *f, void *opaque, int version_id)
                     }
 
                     if (!block) {
-                        if (!qemu_ram_alloc(NULL, id, length))
-                            return -ENOMEM;
+                        fprintf(stderr, "Unknown ramblock \"%s\", cannot "
+                                "accept migration\n", id);
+                        return -EINVAL;
                     }
 
                     total_ram_bytes -= length;

exec.c

@@ -2826,18 +2826,11 @@ ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
 
     QLIST_FOREACH(block, &ram_list.blocks, next) {
         if (!strcmp(block->idstr, new_block->idstr)) {
-            if (block->length == new_block->length) {
-                fprintf(stderr, "RAMBlock \"%s\" exists, assuming lack of"
-                        "free.\n", new_block->idstr);
-                qemu_free(new_block);
-                return block->offset;
-            } else {
-                fprintf(stderr, "RAMBlock \"%s\" already registered with"
-                        "different size, abort\n", new_block->idstr);
+            fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
+                    new_block->idstr);
             abort();
         }
     }
-    }
 
     if (mem_path) {
 #if defined (__linux__) && !defined(TARGET_S390X)