diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index d8ddf35e58..769d7c346f 100644
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -183,3 +183,33 @@ void s390_sclp_init(void)
                               OBJECT(dev), NULL);
     qdev_init_nofail(dev);
 }
+
+sclpMemoryHotplugDev *init_sclp_memory_hotplug_dev(void)
+{
+    DeviceState *dev;
+    dev = qdev_create(NULL, TYPE_SCLP_MEMORY_HOTPLUG_DEV);
+    object_property_add_child(qdev_get_machine(),
+                              TYPE_SCLP_MEMORY_HOTPLUG_DEV,
+                              OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
+    return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
+                                   TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
+}
+
+sclpMemoryHotplugDev *get_sclp_memory_hotplug_dev(void)
+{
+    return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
+                                   TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
+}
+
+static TypeInfo sclp_memory_hotplug_dev_info = {
+    .name = TYPE_SCLP_MEMORY_HOTPLUG_DEV,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(sclpMemoryHotplugDev),
+};
+
+static void register_types(void)
+{
+    type_register_static(&sclp_memory_hotplug_dev_info);
+}
+type_init(register_types);
diff --git a/include/hw/s390x/sclp.h b/include/hw/s390x/sclp.h
index 7ef16226df..5c435749e1 100644
--- a/include/hw/s390x/sclp.h
+++ b/include/hw/s390x/sclp.h
@@ -37,6 +37,7 @@
 #define SCLP_STARTING_SUBINCREMENT_ID           0x10001
 #define SCLP_INCREMENT_UNIT                     0x10000
 #define MAX_AVAIL_SLOTS                         32
+#define MAX_STORAGE_INCREMENTS                  1020
 
 /* CPU hotplug SCLP codes */
 #define SCLP_HAS_CPU_INFO                       0x0C00000000000000ULL
@@ -156,6 +157,23 @@ typedef struct SCCB {
     char data[SCCB_DATA_LEN];
  } QEMU_PACKED SCCB;
 
+typedef struct sclpMemoryHotplugDev sclpMemoryHotplugDev;
+
+#define TYPE_SCLP_MEMORY_HOTPLUG_DEV "sclp-memory-hotplug-dev"
+#define SCLP_MEMORY_HOTPLUG_DEV(obj) \
+  OBJECT_CHECK(sclpMemoryHotplugDev, (obj), TYPE_SCLP_MEMORY_HOTPLUG_DEV)
+
+struct sclpMemoryHotplugDev {
+    SysBusDevice parent;
+    ram_addr_t standby_mem_size;
+    ram_addr_t padded_ram_size;
+    ram_addr_t pad_size;
+    ram_addr_t standby_subregion_size;
+    ram_addr_t rzm;
+    int increment_size;
+    char *standby_state_map;
+};
+
 static inline int sccb_data_len(SCCB *sccb)
 {
     return be16_to_cpu(sccb->h.length) - sizeof(sccb->h);
@@ -163,6 +181,8 @@ static inline int sccb_data_len(SCCB *sccb)
 
 
 void s390_sclp_init(void);
+sclpMemoryHotplugDev *init_sclp_memory_hotplug_dev(void);
+sclpMemoryHotplugDev *get_sclp_memory_hotplug_dev(void);
 void sclp_service_interrupt(uint32_t sccb);
 void raise_irq_cpu_hotplug(void);