diff --git a/hw/isa/piix.c b/hw/isa/piix.c
index 8f7d6c56a8..2ab799b95e 100644
--- a/hw/isa/piix.c
+++ b/hw/isa/piix.c
@@ -315,7 +315,8 @@ static const MemoryRegionOps rcr_ops = {
     },
 };
 
-static void pci_piix3_realize(PCIDevice *dev, Error **errp)
+static void pci_piix_realize(PCIDevice *dev, const char *uhci_type,
+                             Error **errp)
 {
     PIIXState *d = PIIX_PCI_DEVICE(dev);
     PCIBus *pci_bus = pci_get_bus(dev);
@@ -374,8 +375,7 @@ static void pci_piix3_realize(PCIDevice *dev, Error **errp)
 
     /* USB */
     if (d->has_usb) {
-        object_initialize_child(OBJECT(dev), "uhci", &d->uhci,
-                                TYPE_PIIX3_USB_UHCI);
+        object_initialize_child(OBJECT(dev), "uhci", &d->uhci, uhci_type);
         qdev_prop_set_int32(DEVICE(&d->uhci), "addr", dev->devfn + 2);
         if (!qdev_realize(DEVICE(&d->uhci), BUS(pci_bus), errp)) {
             return;
@@ -426,7 +426,7 @@ static void pci_piix_init(Object *obj)
     object_initialize_child(obj, "rtc", &d->rtc, TYPE_MC146818_RTC);
 }
 
-static Property pci_piix3_props[] = {
+static Property pci_piix_props[] = {
     DEFINE_PROP_UINT32("smb_io_base", PIIXState, smb_io_base, 0),
     DEFINE_PROP_BOOL("has-acpi", PIIXState, has_acpi, true),
     DEFINE_PROP_BOOL("has-pic", PIIXState, has_pic, true),
@@ -452,6 +452,7 @@ static void pci_piix_class_init(ObjectClass *klass, void *data)
      * pc_piix.c's pc_init1()
      */
     dc->user_creatable = false;
+    device_class_set_props(dc, pci_piix_props);
     adevc->build_dev_aml = build_pci_isa_aml;
 }
 
@@ -475,7 +476,7 @@ static void piix3_realize(PCIDevice *dev, Error **errp)
     PIIXState *piix3 = PIIX_PCI_DEVICE(dev);
     PCIBus *pci_bus = pci_get_bus(dev);
 
-    pci_piix3_realize(dev, errp);
+    pci_piix_realize(dev, TYPE_PIIX3_USB_UHCI, errp);
     if (*errp) {
         return;
     }
@@ -501,7 +502,6 @@ static void piix3_class_init(ObjectClass *klass, void *data)
     /* 82371SB PIIX3 PCI-to-ISA bridge (Step A1) */
     k->device_id = PCI_DEVICE_ID_INTEL_82371SB_0;
     dc->vmsd = &vmstate_piix3;
-    device_class_set_props(dc, pci_piix3_props);
 }
 
 static const TypeInfo piix3_info = {
@@ -513,71 +513,14 @@ static const TypeInfo piix3_info = {
 
 static void piix4_realize(PCIDevice *dev, Error **errp)
 {
+    ERRP_GUARD();
     PIIXState *s = PIIX_PCI_DEVICE(dev);
     PCIBus *pci_bus = pci_get_bus(dev);
-    ISABus *isa_bus;
-    qemu_irq *i8259_out_irq;
-    qemu_irq *i8259;
-    size_t i;
-
-    isa_bus = isa_bus_new(DEVICE(dev), pci_address_space(dev),
-                          pci_address_space_io(dev), errp);
-    if (!isa_bus) {
-        return;
-    }
-
-    qdev_init_gpio_out_named(DEVICE(dev), &s->cpu_intr,
-                             "intr", 1);
-
-    memory_region_init_io(&s->rcr_mem, OBJECT(dev), &rcr_ops, s,
-                          "piix-reset-control", 1);
-    memory_region_add_subregion_overlap(pci_address_space_io(dev),
-                                        PIIX_RCR_IOPORT, &s->rcr_mem, 1);
-
-    /* initialize i8259 pic */
-    i8259_out_irq = qemu_allocate_irqs(piix_request_i8259_irq, s, 1);
-    i8259 = i8259_init(isa_bus, *i8259_out_irq);
-
-    for (i = 0; i < ISA_NUM_IRQS; i++) {
-        s->isa_irqs_in[i] = i8259[i];
-    }
-
-    g_free(i8259);
-
-    /* initialize ISA irqs */
-    isa_bus_register_input_irqs(isa_bus, s->isa_irqs_in);
-
-    /* initialize pit */
-    i8254_pit_init(isa_bus, 0x40, 0, NULL);
 
-    /* DMA */
-    i8257_dma_init(isa_bus, 0);
-
-    /* RTC */
-    qdev_prop_set_int32(DEVICE(&s->rtc), "base_year", 2000);
-    if (!qdev_realize(DEVICE(&s->rtc), BUS(isa_bus), errp)) {
-        return;
-    }
-    s->rtc.irq = isa_get_irq(ISA_DEVICE(&s->rtc), s->rtc.isairq);
-
-    /* IDE */
-    qdev_prop_set_int32(DEVICE(&s->ide), "addr", dev->devfn + 1);
-    if (!qdev_realize(DEVICE(&s->ide), BUS(pci_bus), errp)) {
-        return;
-    }
-
-    /* USB */
-    qdev_prop_set_int32(DEVICE(&s->uhci), "addr", dev->devfn + 2);
-    if (!qdev_realize(DEVICE(&s->uhci), BUS(pci_bus), errp)) {
-        return;
-    }
-
-    /* ACPI controller */
-    qdev_prop_set_int32(DEVICE(&s->pm), "addr", dev->devfn + 3);
-    if (!qdev_realize(DEVICE(&s->pm), BUS(pci_bus), errp)) {
+    pci_piix_realize(dev, TYPE_PIIX4_USB_UHCI, errp);
+    if (*errp) {
         return;
     }
-    qdev_connect_gpio_out(DEVICE(&s->pm), 0, s->isa_irqs_in[9]);
 
     pci_bus_irqs(pci_bus, piix4_set_irq, s, PIIX_NUM_PIRQS);
 }
@@ -587,11 +530,6 @@ static void piix4_init(Object *obj)
     PIIXState *s = PIIX_PCI_DEVICE(obj);
 
     object_initialize_child(obj, "ide", &s->ide, TYPE_PIIX4_IDE);
-    object_initialize_child(obj, "uhci", &s->uhci, TYPE_PIIX4_USB_UHCI);
-
-    object_initialize_child(obj, "pm", &s->pm, TYPE_PIIX4_PM);
-    qdev_prop_set_uint32(DEVICE(&s->pm), "smb_io_base", 0x1100);
-    qdev_prop_set_bit(DEVICE(&s->pm), "smm-enabled", 0);
 }
 
 static void piix4_class_init(ObjectClass *klass, void *data)
diff --git a/hw/mips/malta.c b/hw/mips/malta.c
index dac27fad9d..155f3c1cc8 100644
--- a/hw/mips/malta.c
+++ b/hw/mips/malta.c
@@ -1238,8 +1238,9 @@ void mips_malta_init(MachineState *machine)
     pci_bus_map_irqs(pci_bus, malta_pci_slot_get_pirq);
 
     /* Southbridge */
-    piix4 = pci_create_simple_multifunction(pci_bus, PIIX4_PCI_DEVFN,
-                                            TYPE_PIIX4_PCI_DEVICE);
+    piix4 = pci_new_multifunction(PIIX4_PCI_DEVFN, TYPE_PIIX4_PCI_DEVICE);
+    qdev_prop_set_uint32(DEVICE(piix4), "smb_io_base", 0x1100);
+    pci_realize_and_unref(piix4, pci_bus, &error_fatal);
     isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix4), "isa.0"));
 
     dev = DEVICE(object_resolve_path_component(OBJECT(piix4), "ide"));
