diff --git a/hw/block/fdc.c b/hw/block/fdc.c
index 79ea6254857d08394f8d36e1f45f6587e6c634cc..930f191d9e83b76bab999470ad733d43188367d5 100644
--- a/hw/block/fdc.c
+++ b/hw/block/fdc.c
@@ -2022,22 +2022,24 @@ static int fdctrl_connect_drives(FDCtrl *fdctrl)
 
 ISADevice *fdctrl_init_isa(ISABus *bus, DriveInfo **fds)
 {
-    ISADevice *dev;
+    DeviceState *dev;
+    ISADevice *isadev;
 
-    dev = isa_try_create(bus, TYPE_ISA_FDC);
-    if (!dev) {
+    isadev = isa_try_create(bus, TYPE_ISA_FDC);
+    if (!isadev) {
         return NULL;
     }
+    dev = DEVICE(isadev);
 
     if (fds[0]) {
-        qdev_prop_set_drive_nofail(&dev->qdev, "driveA", fds[0]->bdrv);
+        qdev_prop_set_drive_nofail(dev, "driveA", fds[0]->bdrv);
     }
     if (fds[1]) {
-        qdev_prop_set_drive_nofail(&dev->qdev, "driveB", fds[1]->bdrv);
+        qdev_prop_set_drive_nofail(dev, "driveB", fds[1]->bdrv);
     }
-    qdev_init_nofail(&dev->qdev);
+    qdev_init_nofail(dev);
 
-    return dev;
+    return isadev;
 }
 
 void fdctrl_init_sysbus(qemu_irq irq, int dma_chann,
diff --git a/hw/char/serial-isa.c b/hw/char/serial-isa.c
index 6e7e0dd05718475f28196316bb37dcc73eb4fbf4..e06a802e248adc0fe9da0db24ed4b057643b10dd 100644
--- a/hw/char/serial-isa.c
+++ b/hw/char/serial-isa.c
@@ -120,15 +120,17 @@ type_init(serial_register_types)
 
 bool serial_isa_init(ISABus *bus, int index, CharDriverState *chr)
 {
-    ISADevice *dev;
+    DeviceState *dev;
+    ISADevice *isadev;
 
-    dev = isa_try_create(bus, TYPE_ISA_SERIAL);
-    if (!dev) {
+    isadev = isa_try_create(bus, TYPE_ISA_SERIAL);
+    if (!isadev) {
         return false;
     }
-    qdev_prop_set_uint32(&dev->qdev, "index", index);
-    qdev_prop_set_chr(&dev->qdev, "chardev", chr);
-    if (qdev_init(&dev->qdev) < 0) {
+    dev = DEVICE(isadev);
+    qdev_prop_set_uint32(dev, "index", index);
+    qdev_prop_set_chr(dev, "chardev", chr);
+    if (qdev_init(dev) < 0) {
         return false;
     }
     return true;
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index e9c91e44a1ee4bbb75ff92959ee292db7172a1d0..0ad062c093aa3b950af77bef07042e4e02e536b6 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1095,7 +1095,7 @@ DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus *pci_bus)
         dev = pcidev ? &pcidev->qdev : NULL;
     } else if (isa_bus) {
         ISADevice *isadev = isa_vga_init(isa_bus);
-        dev = isadev ? &isadev->qdev : NULL;
+        dev = isadev ? DEVICE(isadev) : NULL;
     }
     return dev;
 }
@@ -1182,7 +1182,7 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
         }
         if (hpet) {
             /* connect PIT to output control line of the HPET */
-            qdev_connect_gpio_out(hpet, 0, qdev_get_gpio_in(&pit->qdev, 0));
+            qdev_connect_gpio_out(hpet, 0, qdev_get_gpio_in(DEVICE(pit), 0));
         }
         pcspk_init(isa_bus, pit);
     }
@@ -1210,8 +1210,9 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
         vmmouse = NULL;
     }
     if (vmmouse) {
-        qdev_prop_set_ptr(&vmmouse->qdev, "ps2_mouse", i8042);
-        qdev_init_nofail(&vmmouse->qdev);
+        DeviceState *dev = DEVICE(vmmouse);
+        qdev_prop_set_ptr(dev, "ps2_mouse", i8042);
+        qdev_init_nofail(dev);
     }
     port92 = isa_create_simple(isa_bus, "port92");
     port92_init(port92, &a20_line[1]);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index d6185705a6a80de8e0af811e7f49f3b7e1df7e6d..af1e9afb041cd977f4bb8546a0c5b69daba3f001 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -199,7 +199,7 @@ static void pc_init1(MemoryRegion *system_memory,
             dev = isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i],
                                ide_irq[i],
                                hd[MAX_IDE_DEVS * i], hd[MAX_IDE_DEVS * i + 1]);
-            idebus[i] = qdev_get_child_bus(&dev->qdev, "ide.0");
+            idebus[i] = qdev_get_child_bus(DEVICE(dev), "ide.0");
         }
     }
 
diff --git a/hw/intc/i8259_common.c b/hw/intc/i8259_common.c
index 7613547734fa5085b506d398b43eb14d9773d843..803d037f68be9899161b09f79a455b45560dfc18 100644
--- a/hw/intc/i8259_common.c
+++ b/hw/intc/i8259_common.c
@@ -80,16 +80,18 @@ static void pic_common_realize(DeviceState *dev, Error **errp)
 
 ISADevice *i8259_init_chip(const char *name, ISABus *bus, bool master)
 {
-    ISADevice *dev;
-
-    dev = isa_create(bus, name);
-    qdev_prop_set_uint32(&dev->qdev, "iobase", master ? 0x20 : 0xa0);
-    qdev_prop_set_uint32(&dev->qdev, "elcr_addr", master ? 0x4d0 : 0x4d1);
-    qdev_prop_set_uint8(&dev->qdev, "elcr_mask", master ? 0xf8 : 0xde);
-    qdev_prop_set_bit(&dev->qdev, "master", master);
-    qdev_init_nofail(&dev->qdev);
-
-    return dev;
+    DeviceState *dev;
+    ISADevice *isadev;
+
+    isadev = isa_create(bus, name);
+    dev = DEVICE(isadev);
+    qdev_prop_set_uint32(dev, "iobase", master ? 0x20 : 0xa0);
+    qdev_prop_set_uint32(dev, "elcr_addr", master ? 0x4d0 : 0x4d1);
+    qdev_prop_set_uint8(dev, "elcr_mask", master ? 0xf8 : 0xde);
+    qdev_prop_set_bit(dev, "master", master);
+    qdev_init_nofail(dev);
+
+    return isadev;
 }
 
 static const VMStateDescription vmstate_pic_common = {
diff --git a/hw/isa/i82378.c b/hw/isa/i82378.c
index 278e17817314fcb8acaa9d8484722ceceadb50f1..a24cb98cbac36a1b6857fe0d14b7b29d68df34de 100644
--- a/hw/isa/i82378.c
+++ b/hw/isa/i82378.c
@@ -201,7 +201,7 @@ static void i82378_init(DeviceState *dev, I82378State *s)
 
     /* 2 82C37 (dma) */
     isa = isa_create_simple(isabus, "i82374");
-    qdev_connect_gpio_out(&isa->qdev, 0, s->out[1]);
+    qdev_connect_gpio_out(DEVICE(isa), 0, s->out[1]);
 
     /* timer */
     isa_create_simple(isabus, "mc146818rtc");
diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 7aa9b89b5ca984aa6c7f20af4330bbb0c6b0da6c..136d17ede0a7c50d589709a54a23c74492e28cd1 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -156,7 +156,7 @@ ISADevice *isa_create_simple(ISABus *bus, const char *name)
     ISADevice *dev;
 
     dev = isa_create(bus, name);
-    qdev_init_nofail(&dev->qdev);
+    qdev_init_nofail(DEVICE(dev));
     return dev;
 }
 
@@ -240,7 +240,7 @@ static void isabus_register_types(void)
 
 static char *isabus_get_fw_dev_path(DeviceState *dev)
 {
-    ISADevice *d = (ISADevice*)dev;
+    ISADevice *d = ISA_DEVICE(dev);
     char path[40];
     int off;
 
diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
index 9e770ab3506a524b4bb50eaf0542a44c49525748..4fdc1649fd322e0a4e533a64a239eac2cc52782f 100644
--- a/hw/ppc/prep.c
+++ b/hw/ppc/prep.c
@@ -605,8 +605,9 @@ static void ppc_prep_init(QEMUMachineInitArgs *args)
 
     /* Super I/O (parallel + serial ports) */
     isa = isa_create(isa_bus, TYPE_PC87312);
-    qdev_prop_set_uint8(&isa->qdev, "config", 13); /* fdc, ser0, ser1, par0 */
-    qdev_init_nofail(&isa->qdev);
+    dev = DEVICE(isa);
+    qdev_prop_set_uint8(dev, "config", 13); /* fdc, ser0, ser1, par0 */
+    qdev_init_nofail(dev);
 
     /* Register 8 MB of ISA IO space (needed for non-contiguous map) */
     memory_region_init_io(PPC_io_memory, &PPC_prep_io_ops, sysctrl,
diff --git a/include/hw/audio/pcspk.h b/include/hw/audio/pcspk.h
index 76251379910ba1ecbf65bc198957a0cf845274a9..ef95dd13601a1cb4c128d5584b59a43d250ba4f2 100644
--- a/include/hw/audio/pcspk.h
+++ b/include/hw/audio/pcspk.h
@@ -32,14 +32,16 @@
 
 static inline ISADevice *pcspk_init(ISABus *bus, ISADevice *pit)
 {
-    ISADevice *dev;
+    DeviceState *dev;
+    ISADevice *isadev;
 
-    dev = isa_create(bus, TYPE_PC_SPEAKER);
-    qdev_prop_set_uint32(&dev->qdev, "iobase", 0x61);
-    qdev_prop_set_ptr(&dev->qdev, "pit", pit);
-    qdev_init_nofail(&dev->qdev);
+    isadev = isa_create(bus, TYPE_PC_SPEAKER);
+    dev = DEVICE(isadev);
+    qdev_prop_set_uint32(dev, "iobase", 0x61);
+    qdev_prop_set_ptr(dev, "pit", pit);
+    qdev_init_nofail(dev);
 
-    return dev;
+    return isadev;
 }
 
 #endif /* !HW_PCSPK_H */
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 61540587a4c8831bfd38dfc48bb75aabe66b92fa..5d883eb647c1475b97c3fad75338c9d16b44b0ae 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -14,15 +14,17 @@
 /* parallel.c */
 static inline bool parallel_init(ISABus *bus, int index, CharDriverState *chr)
 {
-    ISADevice *dev;
+    DeviceState *dev;
+    ISADevice *isadev;
 
-    dev = isa_try_create(bus, "isa-parallel");
-    if (!dev) {
+    isadev = isa_try_create(bus, "isa-parallel");
+    if (!isadev) {
         return false;
     }
-    qdev_prop_set_uint32(&dev->qdev, "index", index);
-    qdev_prop_set_chr(&dev->qdev, "chardev", chr);
-    if (qdev_init(&dev->qdev) < 0) {
+    dev = DEVICE(isadev);
+    qdev_prop_set_uint32(dev, "index", index);
+    qdev_prop_set_chr(dev, "chardev", chr);
+    if (qdev_init(dev) < 0) {
         return false;
     }
     return true;
@@ -155,18 +157,20 @@ int isa_vga_mm_init(hwaddr vram_base,
 /* ne2000.c */
 static inline bool isa_ne2000_init(ISABus *bus, int base, int irq, NICInfo *nd)
 {
-    ISADevice *dev;
+    DeviceState *dev;
+    ISADevice *isadev;
 
     qemu_check_nic_model(nd, "ne2k_isa");
 
-    dev = isa_try_create(bus, "ne2k_isa");
-    if (!dev) {
+    isadev = isa_try_create(bus, "ne2k_isa");
+    if (!isadev) {
         return false;
     }
-    qdev_prop_set_uint32(&dev->qdev, "iobase", base);
-    qdev_prop_set_uint32(&dev->qdev, "irq",    irq);
-    qdev_set_nic_properties(&dev->qdev, nd);
-    qdev_init_nofail(&dev->qdev);
+    dev = DEVICE(isadev);
+    qdev_prop_set_uint32(dev, "iobase", base);
+    qdev_prop_set_uint32(dev, "irq",    irq);
+    qdev_set_nic_properties(dev, nd);
+    qdev_init_nofail(dev);
     return true;
 }
 
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
index da731d7bc73d2ab194bd50efb748fa481d2d23c6..e1bf96ca690848e3f2eebdb2c1b4ca1a1bf9db45 100644
--- a/include/hw/isa/isa.h
+++ b/include/hw/isa/isa.h
@@ -34,7 +34,10 @@ struct ISABus {
 };
 
 struct ISADevice {
-    DeviceState qdev;
+    /*< private >*/
+    DeviceState parent_obj;
+    /*< public >*/
+
     uint32_t isairq[2];
     int nirqs;
     int ioport_id;