diff --git a/cpu-all.h b/cpu-all.h
index dbb21394d1463823c7b687053192156d919ee402..5d8342bac6b89eaa03ac9bdad9fa8899acbed75f 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -865,6 +865,7 @@ typedef struct RAMBlock {
     uint8_t *host;
     ram_addr_t offset;
     ram_addr_t length;
+    char idstr[256];
     QLIST_ENTRY(RAMBlock) next;
 } RAMBlock;
 
diff --git a/exec.c b/exec.c
index 164ba16131fc97ca91393b576a6cbb9805ad870f..fd47d5bc9a813e7ace1643599df919e3297b8298 100644
--- a/exec.c
+++ b/exec.c
@@ -36,6 +36,7 @@
 #include "qemu-common.h"
 #include "tcg.h"
 #include "hw/hw.h"
+#include "hw/qdev.h"
 #include "osdep.h"
 #include "kvm.h"
 #include "qemu-timer.h"
@@ -2780,10 +2781,34 @@ static ram_addr_t find_ram_offset(ram_addr_t size)
 
 ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
 {
-    RAMBlock *new_block;
+    RAMBlock *new_block, *block;
 
     size = TARGET_PAGE_ALIGN(size);
-    new_block = qemu_malloc(sizeof(*new_block));
+    new_block = qemu_mallocz(sizeof(*new_block));
+
+    if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
+        char *id = dev->parent_bus->info->get_dev_path(dev);
+        if (id) {
+            snprintf(new_block->idstr, sizeof(new_block->idstr), "%s/", id);
+            qemu_free(id);
+        }
+    }
+    pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
+
+    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);
+                abort();
+            }
+        }
+    }
 
     if (mem_path) {
 #if defined (__linux__) && !defined(TARGET_S390X)