diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index eae1305eaf6125aee4224fd838bacd90cf18ff23..27a83602071ed9d429513031580721adab740c53 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -100,15 +100,28 @@ static void virtio_ccw_register_hcalls(void)
                                    virtio_ccw_hcall_early_printk);
 }
 
-static void ccw_init(MachineState *machine)
+void s390_memory_init(ram_addr_t mem_size)
 {
     MemoryRegion *sysmem = get_system_memory();
     MemoryRegion *ram = g_new(MemoryRegion, 1);
+
+    /* allocate RAM for core */
+    memory_region_init_ram(ram, NULL, "s390.ram", mem_size, &error_abort);
+    vmstate_register_ram_global(ram);
+    memory_region_add_subregion(sysmem, 0, ram);
+
+    /* Initialize storage key device */
+    s390_skeys_init();
+}
+
+static void ccw_init(MachineState *machine)
+{
     int ret;
     VirtualCssBus *css_bus;
     DeviceState *dev;
 
     s390_sclp_init();
+    s390_memory_init(machine->ram_size);
 
     /* get a BUS */
     css_bus = virtual_css_bus_init();
@@ -124,15 +137,6 @@ static void ccw_init(MachineState *machine)
     /* register hypercalls */
     virtio_ccw_register_hcalls();
 
-    /* allocate RAM for core */
-    memory_region_init_ram(ram, NULL, "s390.ram", machine->ram_size,
-                           &error_abort);
-    vmstate_register_ram_global(ram);
-    memory_region_add_subregion(sysmem, 0, ram);
-
-    /* Initialize storage key device */
-    s390_skeys_init();
-
     /* init CPUs */
     s390_init_cpus(machine->cpu_model);
 
diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c
index c8e4737cba60e4d17ce1d8954df93f8b9909c411..e4000c92e1914d3c85b9a8049773b290e7381530 100644
--- a/hw/s390x/s390-virtio.c
+++ b/hw/s390x/s390-virtio.c
@@ -262,8 +262,6 @@ int gtod_load(QEMUFile *f, void *opaque, int version_id)
 static void s390_init(MachineState *machine)
 {
     ram_addr_t my_ram_size;
-    MemoryRegion *sysmem = get_system_memory();
-    MemoryRegion *ram = g_new(MemoryRegion, 1);
     void *virtio_region;
     hwaddr virtio_region_len;
     hwaddr virtio_region_start;
@@ -285,9 +283,7 @@ static void s390_init(MachineState *machine)
     s390_virtio_register_hcalls();
 
     /* allocate RAM */
-    memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size, &error_abort);
-    vmstate_register_ram_global(ram);
-    memory_region_add_subregion(sysmem, 0, ram);
+    s390_memory_init(my_ram_size);
 
     /* clear virtio region */
     virtio_region_len = my_ram_size - ram_size;
@@ -298,9 +294,6 @@ static void s390_init(MachineState *machine)
     cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1,
                               virtio_region_len);
 
-    /* Initialize storage key device */
-    s390_skeys_init();
-
     /* init CPUs */
     s390_init_cpus(machine->cpu_model);
 
diff --git a/hw/s390x/s390-virtio.h b/hw/s390x/s390-virtio.h
index cf687968b43fae6b03b56bf320ecdcb3342e1d89..f389aa1a6779e29edb523dc7efdba5314a5f79f8 100644
--- a/hw/s390x/s390-virtio.h
+++ b/hw/s390x/s390-virtio.h
@@ -27,4 +27,5 @@ void s390_init_ipl_dev(const char *kernel_filename,
                        bool enforce_bios);
 void s390_create_virtio_net(BusState *bus, const char *name);
 void s390_nmi(NMIState *n, int cpu_index, Error **errp);
+void s390_memory_init(ram_addr_t mem_size);
 #endif