diff --git a/cpu-common.h b/cpu-common.h
index 48f4c01a3f..72eb731c3e 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -61,9 +61,12 @@ static inline void cpu_register_physical_memory(target_phys_addr_t start_addr,
 }
 
 ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr);
+struct MemoryRegion;
 ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
-                        ram_addr_t size, void *host);
-ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size);
+                                   ram_addr_t size, void *host,
+                                   struct MemoryRegion *mr);
+ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size,
+                          struct MemoryRegion *mr);
 void qemu_ram_free(ram_addr_t addr);
 void qemu_ram_free_from_ptr(ram_addr_t addr);
 void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
diff --git a/exec.c b/exec.c
index 06889bdf18..fbcb1bf028 100644
--- a/exec.c
+++ b/exec.c
@@ -2916,7 +2916,8 @@ static ram_addr_t last_ram_offset(void)
 }
 
 ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
-                                   ram_addr_t size, void *host)
+                                   ram_addr_t size, void *host,
+                                   MemoryRegion *mr)
 {
     RAMBlock *new_block, *block;
 
@@ -2972,7 +2973,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
             }
 #else
             if (xen_enabled()) {
-                xen_ram_alloc(new_block->offset, size);
+                xen_ram_alloc(new_block->offset, size, mr);
             } else {
                 new_block->host = qemu_vmalloc(size);
             }
@@ -2995,9 +2996,10 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
     return new_block->offset;
 }
 
-ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
+ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size,
+                          MemoryRegion *mr)
 {
-    return qemu_ram_alloc_from_ptr(dev, name, size, NULL);
+    return qemu_ram_alloc_from_ptr(dev, name, size, NULL, mr);
 }
 
 void qemu_ram_free_from_ptr(ram_addr_t addr)
diff --git a/hw/xen.h b/hw/xen.h
index 21621115e4..f9f66e83ef 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -44,7 +44,9 @@ void xen_vcpu_init(void);
 void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
 
 #if defined(NEED_CPU_H) && !defined(CONFIG_USER_ONLY)
-void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size);
+struct MemoryRegion;
+void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
+                   struct MemoryRegion *mr);
 #endif
 
 #if defined(CONFIG_XEN) && CONFIG_XEN_CTRL_INTERFACE_VERSION < 400
diff --git a/memory.c b/memory.c
index 87639ab6ea..37e4f0905b 100644
--- a/memory.c
+++ b/memory.c
@@ -997,7 +997,7 @@ void memory_region_init_ram(MemoryRegion *mr,
     memory_region_init(mr, name, size);
     mr->terminates = true;
     mr->destructor = memory_region_destructor_ram;
-    mr->ram_addr = qemu_ram_alloc(dev, name, size);
+    mr->ram_addr = qemu_ram_alloc(dev, name, size, mr);
     mr->backend_registered = true;
 }
 
@@ -1010,7 +1010,7 @@ void memory_region_init_ram_ptr(MemoryRegion *mr,
     memory_region_init(mr, name, size);
     mr->terminates = true;
     mr->destructor = memory_region_destructor_ram_from_ptr;
-    mr->ram_addr = qemu_ram_alloc_from_ptr(dev, name, size, ptr);
+    mr->ram_addr = qemu_ram_alloc_from_ptr(dev, name, size, ptr, mr);
     mr->backend_registered = true;
 }
 
@@ -1037,7 +1037,7 @@ void memory_region_init_rom_device(MemoryRegion *mr,
     mr->opaque = opaque;
     mr->terminates = true;
     mr->destructor = memory_region_destructor_rom_device;
-    mr->ram_addr = qemu_ram_alloc(dev, name, size);
+    mr->ram_addr = qemu_ram_alloc(dev, name, size, mr);
     mr->ram_addr |= cpu_register_io_memory(memory_region_read_thunk,
                                            memory_region_write_thunk,
                                            mr,
diff --git a/xen-all.c b/xen-all.c
index b5e28abd40..bd89889502 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -16,6 +16,7 @@
 #include "range.h"
 #include "xen-mapcache.h"
 #include "trace.h"
+#include "exec-memory.h"
 
 #include <xen/hvm/ioreq.h>
 #include <xen/hvm/params.h>
@@ -31,6 +32,8 @@
     do { } while (0)
 #endif
 
+static MemoryRegion ram_memory, ram_640k, ram_lo, ram_hi;
+
 /* Compatibility with older version */
 #if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
 static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
@@ -137,27 +140,18 @@ qemu_irq *xen_interrupt_controller_init(void)
 
 static void xen_ram_init(ram_addr_t ram_size)
 {
-    RAMBlock *new_block;
+    MemoryRegion *sysmem = get_system_memory();
     ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
+    ram_addr_t block_len;
 
-    new_block = g_malloc0(sizeof (*new_block));
-    pstrcpy(new_block->idstr, sizeof (new_block->idstr), "xen.ram");
-    new_block->host = NULL;
-    new_block->offset = 0;
-    new_block->length = ram_size;
+    block_len = ram_size;
     if (ram_size >= HVM_BELOW_4G_RAM_END) {
         /* Xen does not allocate the memory continuously, and keep a hole at
          * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
          */
-        new_block->length += HVM_BELOW_4G_MMIO_LENGTH;
+        block_len += HVM_BELOW_4G_MMIO_LENGTH;
     }
-
-    QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
-
-    ram_list.phys_dirty = g_realloc(ram_list.phys_dirty,
-                                       new_block->length >> TARGET_PAGE_BITS);
-    memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
-           0xff, new_block->length >> TARGET_PAGE_BITS);
+    memory_region_init_ram(&ram_memory, NULL, "xen.ram", block_len);
 
     if (ram_size >= HVM_BELOW_4G_RAM_END) {
         above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
@@ -166,27 +160,36 @@ static void xen_ram_init(ram_addr_t ram_size)
         below_4g_mem_size = ram_size;
     }
 
-    cpu_register_physical_memory(0, 0xa0000, 0);
+    memory_region_init_alias(&ram_640k, "xen.ram.640k",
+                             &ram_memory, 0, 0xa0000);
+    memory_region_add_subregion(sysmem, 0, &ram_640k);
     /* Skip of the VGA IO memory space, it will be registered later by the VGA
      * emulated device.
      *
      * The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
      * the Options ROM, so it is registered here as RAM.
      */
-    cpu_register_physical_memory(0xc0000, below_4g_mem_size - 0xc0000,
-                                 0xc0000);
+    memory_region_init_alias(&ram_lo, "xen.ram.lo",
+                             &ram_memory, 0xc0000, below_4g_mem_size - 0xc0000);
+    memory_region_add_subregion(sysmem, 0xc0000, &ram_lo);
     if (above_4g_mem_size > 0) {
-        cpu_register_physical_memory(0x100000000ULL, above_4g_mem_size,
-                                     0x100000000ULL);
+        memory_region_init_alias(&ram_hi, "xen.ram.hi",
+                                 &ram_memory, 0x100000000ULL,
+                                 above_4g_mem_size);
+        memory_region_add_subregion(sysmem, 0x100000000ULL, &ram_hi);
     }
 }
 
-void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size)
+void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
 {
     unsigned long nr_pfn;
     xen_pfn_t *pfn_list;
     int i;
 
+    if (mr == &ram_memory) {
+        return;
+    }
+
     trace_xen_ram_alloc(ram_addr, size);
 
     nr_pfn = size >> TARGET_PAGE_BITS;
diff --git a/xen-stub.c b/xen-stub.c
index efe2ab55f2..5fa400faae 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -8,6 +8,7 @@
 
 #include "qemu-common.h"
 #include "hw/xen.h"
+#include "memory.h"
 
 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
 {
@@ -30,7 +31,7 @@ void xen_cmos_set_s3_resume(void *opaque, int irq, int level)
 {
 }
 
-void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size)
+void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
 {
 }