[v2,2/2] pci_host: Derive remaining PCI host controllers from TYPE_PCI_HOST

diff --git a/hw/alpha_typhoon.c b/hw/alpha_typhoon.c
index 872e112..3ec49b8 100644
--- a/hw/alpha_typhoon.c
+++ b/hw/alpha_typhoon.c
@@ -817,9 +817,9 @@  static void typhoon_pcihost_class_init(ObjectClass *klass, void *data)
     dc->no_user = 1;
 }
 
-static TypeInfo typhoon_pcihost_info = {
+static const TypeInfo typhoon_pcihost_info = {
     .name          = "typhoon-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(TyphoonState),
     .class_init    = typhoon_pcihost_class_init,
 };
diff --git a/hw/bonito.c b/hw/bonito.c
index 77786f8..3ef1ac0 100644
--- a/hw/bonito.c
+++ b/hw/bonito.c
@@ -180,7 +180,7 @@ 
 #define PCI_ADDR(busno,devno,funno,regno)  \
     ((((busno)<<16)&0xff0000) + (((devno)<<11)&0xf800) + (((funno)<<8)&0x700) + (regno))
 
-typedef PCIHostState BonitoState;
+typedef struct BonitoState BonitoState;
 
 typedef struct PCIBonitoState
 {
@@ -218,6 +218,15 @@  typedef struct PCIBonitoState
 
 } PCIBonitoState;
 
+#define TYPE_BONITO_PCI_HOST "Bonito-pcihost"
+
+#define BONITO_PCI_HOST(obj) \
+    OBJECT_CHECK(BonitoState, (obj), TYPE_BONITO_PCI_HOST)
+
+struct BonitoState {
+    PCIHostState parent_obj;
+};
+
 PCIBonitoState * bonito_state;
 
 static void bonito_writel(void *opaque, target_phys_addr_t addr,
@@ -402,6 +411,7 @@  static const MemoryRegionOps bonito_cop_ops = {
 static uint32_t bonito_sbridge_pciaddr(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t cfgaddr;
     uint32_t idsel;
     uint32_t devno;
@@ -427,9 +437,9 @@  static uint32_t bonito_sbridge_pciaddr(void *opaque, target_phys_addr_t addr)
             ",pcimap_cfg=%x\n", addr, s->regs[BONITO_PCIMAP_CFG]);
         exit(1);
     }
-    pciaddr = PCI_ADDR(pci_bus_num(s->pcihost->bus), devno, funno, regno);
+    pciaddr = PCI_ADDR(pci_bus_num(pcihost->bus), devno, funno, regno);
     DPRINTF("cfgaddr %x pciaddr %x busno %x devno %d funno %d regno %d\n",
-        cfgaddr, pciaddr, pci_bus_num(s->pcihost->bus), devno, funno, regno);
+        cfgaddr, pciaddr, pci_bus_num(pcihost->bus), devno, funno, regno);
 
     return pciaddr;
 }
@@ -438,6 +448,7 @@  static void bonito_spciconf_writeb(void *opaque, target_phys_addr_t addr,
                                    uint32_t val)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -449,8 +460,8 @@  static void bonito_spciconf_writeb(void *opaque, target_phys_addr_t addr,
     }
 
     /* set the pci address in s->config_reg */
-    s->pcihost->config_reg = (pciaddr) | (1u << 31);
-    pci_data_write(s->pcihost->bus, s->pcihost->config_reg, val & 0xff, 1);
+    pcihost->config_reg = (pciaddr) | (1u << 31);
+    pci_data_write(pcihost->bus, pcihost->config_reg, val & 0xff, 1);
 
     /* clear PCI_STATUS_REC_MASTER_ABORT and PCI_STATUS_REC_TARGET_ABORT */
     status = pci_get_word(s->dev.config + PCI_STATUS);
@@ -462,6 +473,7 @@  static void bonito_spciconf_writew(void *opaque, target_phys_addr_t addr,
                                    uint32_t val)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -475,8 +487,8 @@  static void bonito_spciconf_writew(void *opaque, target_phys_addr_t addr,
     }
 
     /* set the pci address in s->config_reg */
-    s->pcihost->config_reg = (pciaddr) | (1u << 31);
-    pci_data_write(s->pcihost->bus, s->pcihost->config_reg, val, 2);
+    pcihost->config_reg = (pciaddr) | (1u << 31);
+    pci_data_write(pcihost->bus, pcihost->config_reg, val, 2);
 
     /* clear PCI_STATUS_REC_MASTER_ABORT and PCI_STATUS_REC_TARGET_ABORT */
     status = pci_get_word(s->dev.config + PCI_STATUS);
@@ -488,6 +500,7 @@  static void bonito_spciconf_writel(void *opaque, target_phys_addr_t addr,
                                    uint32_t val)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -501,8 +514,8 @@  static void bonito_spciconf_writel(void *opaque, target_phys_addr_t addr,
     }
 
     /* set the pci address in s->config_reg */
-    s->pcihost->config_reg = (pciaddr) | (1u << 31);
-    pci_data_write(s->pcihost->bus, s->pcihost->config_reg, val, 4);
+    pcihost->config_reg = (pciaddr) | (1u << 31);
+    pci_data_write(pcihost->bus, pcihost->config_reg, val, 4);
 
     /* clear PCI_STATUS_REC_MASTER_ABORT and PCI_STATUS_REC_TARGET_ABORT */
     status = pci_get_word(s->dev.config + PCI_STATUS);
@@ -513,6 +526,7 @@  static void bonito_spciconf_writel(void *opaque, target_phys_addr_t addr,
 static uint32_t bonito_spciconf_readb(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -524,19 +538,20 @@  static uint32_t bonito_spciconf_readb(void *opaque, target_phys_addr_t addr)
     }
 
     /* set the pci address in s->config_reg */
-    s->pcihost->config_reg = (pciaddr) | (1u << 31);
+    pcihost->config_reg = (pciaddr) | (1u << 31);
 
     /* clear PCI_STATUS_REC_MASTER_ABORT and PCI_STATUS_REC_TARGET_ABORT */
     status = pci_get_word(s->dev.config + PCI_STATUS);
     status &= ~(PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT);
     pci_set_word(s->dev.config + PCI_STATUS, status);
 
-    return pci_data_read(s->pcihost->bus, s->pcihost->config_reg, 1);
+    return pci_data_read(pcihost->bus, pcihost->config_reg, 1);
 }
 
 static uint32_t bonito_spciconf_readw(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -550,19 +565,20 @@  static uint32_t bonito_spciconf_readw(void *opaque, target_phys_addr_t addr)
     }
 
     /* set the pci address in s->config_reg */
-    s->pcihost->config_reg = (pciaddr) | (1u << 31);
+    pcihost->config_reg = (pciaddr) | (1u << 31);
 
     /* clear PCI_STATUS_REC_MASTER_ABORT and PCI_STATUS_REC_TARGET_ABORT */
     status = pci_get_word(s->dev.config + PCI_STATUS);
     status &= ~(PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT);
     pci_set_word(s->dev.config + PCI_STATUS, status);
 
-    return pci_data_read(s->pcihost->bus, s->pcihost->config_reg, 2);
+    return pci_data_read(pcihost->bus, pcihost->config_reg, 2);
 }
 
 static uint32_t bonito_spciconf_readl(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -576,14 +592,14 @@  static uint32_t bonito_spciconf_readl(void *opaque, target_phys_addr_t addr)
     }
 
     /* set the pci address in s->config_reg */
-    s->pcihost->config_reg = (pciaddr) | (1u << 31);
+    pcihost->config_reg = (pciaddr) | (1u << 31);
 
     /* clear PCI_STATUS_REC_MASTER_ABORT and PCI_STATUS_REC_TARGET_ABORT */
     status = pci_get_word(s->dev.config + PCI_STATUS);
     status &= ~(PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT);
     pci_set_word(s->dev.config + PCI_STATUS, status);
 
-    return pci_data_read(s->pcihost->bus, s->pcihost->config_reg, 4);
+    return pci_data_read(pcihost->bus, pcihost->config_reg, 4);
 }
 
 /* south bridge PCI configure space. 0x1fe8 0000 - 0x1fef ffff */
@@ -679,7 +695,8 @@  static int bonito_pcihost_initfn(SysBusDevice *dev)
 static int bonito_initfn(PCIDevice *dev)
 {
     PCIBonitoState *s = DO_UPCAST(PCIBonitoState, dev, dev);
-    SysBusDevice *sysbus = &s->pcihost->busdev;
+    SysBusDevice *sysbus = SYS_BUS_DEVICE(s->pcihost);
+    PCIHostState *pcihost = PCI_HOST(s->pcihost);
 
     /* Bonito North Bridge, built on FPGA, VENDOR_ID/DEVICE_ID are "undefined" */
     pci_config_set_prog_interface(dev->config, 0x00);
@@ -691,15 +708,15 @@  static int bonito_initfn(PCIDevice *dev)
     sysbus_mmio_map(sysbus, 0, BONITO_INTERNAL_REG_BASE);
 
     /* set the north bridge pci configure  mapping */
-    memory_region_init_io(&s->pcihost->conf_mem, &bonito_pciconf_ops, s,
+    memory_region_init_io(&pcihost->conf_mem, &bonito_pciconf_ops, s,
                           "north-bridge-pci-config", BONITO_PCICONFIG_SIZE);
-    sysbus_init_mmio(sysbus, &s->pcihost->conf_mem);
+    sysbus_init_mmio(sysbus, &pcihost->conf_mem);
     sysbus_mmio_map(sysbus, 1, BONITO_PCICONFIG_BASE);
 
     /* set the south bridge pci configure  mapping */
-    memory_region_init_io(&s->pcihost->data_mem, &bonito_spciconf_ops, s,
+    memory_region_init_io(&pcihost->data_mem, &bonito_spciconf_ops, s,
                           "south-bridge-pci-config", BONITO_SPCICONFIG_SIZE);
-    sysbus_init_mmio(sysbus, &s->pcihost->data_mem);
+    sysbus_init_mmio(sysbus, &pcihost->data_mem);
     sysbus_mmio_map(sysbus, 2, BONITO_SPCICONFIG_BASE);
 
     memory_region_init_io(&s->iomem_ldma, &bonito_ldma_ops, s,
@@ -743,13 +760,13 @@  PCIBus *bonito_init(qemu_irq *pic)
 {
     DeviceState *dev;
     PCIBus *b;
-    BonitoState *pcihost;
+    PCIHostState *pcihost;
     PCIBonitoState *s;
     PCIDevice *d;
 
-    dev = qdev_create(NULL, "Bonito-pcihost");
-    pcihost = FROM_SYSBUS(BonitoState, sysbus_from_qdev(dev));
-    b = pci_register_bus(&pcihost->busdev.qdev, "pci", pci_bonito_set_irq,
+    dev = qdev_create(NULL, TYPE_BONITO_PCI_HOST);
+    pcihost = PCI_HOST(dev);
+    b = pci_register_bus(dev, "pci", pci_bonito_set_irq,
                          pci_bonito_map_irq, pic, get_system_memory(),
                          get_system_io(),
                          0x28, 32);
@@ -759,7 +776,7 @@  PCIBus *bonito_init(qemu_irq *pic)
     /* set the pcihost pointer before bonito_initfn is called */
     d = pci_create(b, PCI_DEVFN(0, 0), "Bonito");
     s = DO_UPCAST(PCIBonitoState, dev, d);
-    s->pcihost = pcihost;
+    s->pcihost = BONITO_PCI_HOST(pcihost);
     bonito_state = s;
     qdev_init_nofail(&d->qdev);
 
@@ -797,9 +814,9 @@  static void bonito_pcihost_class_init(ObjectClass *klass, void *data)
     dc->no_user = 1;
 }
 
-static TypeInfo bonito_pcihost_info = {
-    .name          = "Bonito-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+static const TypeInfo bonito_pcihost_info = {
+    .name          = TYPE_BONITO_PCI_HOST,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(BonitoState),
     .class_init    = bonito_pcihost_class_init,
 };
diff --git a/hw/dec_pci.c b/hw/dec_pci.c
index 37337bf..074c35a 100644
--- a/hw/dec_pci.c
+++ b/hw/dec_pci.c
@@ -40,8 +40,9 @@ 
 #define DEC_DPRINTF(fmt, ...)
 #endif
 
+#define DEC_21154(obj) OBJECT_CHECK(DECState, (obj), TYPE_DEC_21154)
+
 typedef struct DECState {
-    SysBusDevice busdev;
     PCIHostState host_state;
 } DECState;
 
@@ -90,7 +91,7 @@  static int pci_dec_21154_device_init(SysBusDevice *dev)
 {
     DECState *s;
 
-    s = FROM_SYSBUS(DECState, dev);
+    s = DEC_21154(dev);
 
     memory_region_init_io(&s->host_state.conf_mem, &pci_host_conf_le_ops,
                           &s->host_state, "pci-conf-idx", 0x1000);
@@ -133,9 +134,9 @@  static void pci_dec_21154_device_class_init(ObjectClass *klass, void *data)
     sdc->init = pci_dec_21154_device_init;
 }
 
-static TypeInfo pci_dec_21154_device_info = {
-    .name          = "dec-21154-sysbus",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+static const TypeInfo pci_dec_21154_device_info = {
+    .name          = TYPE_DEC_21154,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(DECState),
     .class_init    = pci_dec_21154_device_class_init,
 };
diff --git a/hw/dec_pci.h b/hw/dec_pci.h
index 79264ba..17dc0c2 100644
--- a/hw/dec_pci.h
+++ b/hw/dec_pci.h
@@ -3,6 +3,8 @@ 
 
 #include "qemu-common.h"
 
+#define TYPE_DEC_21154 "dec-21154-sysbus"
+
 PCIBus *pci_dec_21154_init(PCIBus *parent_bus, int devfn);
 
 #endif
diff --git a/hw/grackle_pci.c b/hw/grackle_pci.c
index 81ff3a3..89cbddf 100644
--- a/hw/grackle_pci.c
+++ b/hw/grackle_pci.c
@@ -23,10 +23,9 @@ 
  * THE SOFTWARE.
  */
 
-#include "sysbus.h"
+#include "pci_host.h"
 #include "ppc_mac.h"
 #include "pci.h"
-#include "pci_host.h"
 
 /* debug Grackle */
 //#define DEBUG_GRACKLE
@@ -38,9 +37,12 @@ 
 #define GRACKLE_DPRINTF(fmt, ...)
 #endif
 
+#define GRACKLE_PCI_HOST(obj) \
+    OBJECT_CHECK(GrackleState, (obj), TYPE_GRACKLE_PCI_HOST)
+
 typedef struct GrackleState {
-    SysBusDevice busdev;
     PCIHostState host_state;
+
     MemoryRegion pci_mmio;
     MemoryRegion pci_hole;
 } GrackleState;
@@ -71,10 +73,10 @@  PCIBus *pci_grackle_init(uint32_t base, qemu_irq *pic,
     SysBusDevice *s;
     GrackleState *d;
 
-    dev = qdev_create(NULL, "grackle-pcihost");
+    dev = qdev_create(NULL, TYPE_GRACKLE_PCI_HOST);
     qdev_init_nofail(dev);
     s = sysbus_from_qdev(dev);
-    d = FROM_SYSBUS(GrackleState, s);
+    d = GRACKLE_PCI_HOST(dev);
 
     memory_region_init(&d->pci_mmio, "pci-mmio", 0x100000000ULL);
     memory_region_init_alias(&d->pci_hole, "pci-hole", &d->pci_mmio,
@@ -82,7 +84,7 @@  PCIBus *pci_grackle_init(uint32_t base, qemu_irq *pic,
     memory_region_add_subregion(address_space_mem, 0x80000000ULL,
                                 &d->pci_hole);
 
-    d->host_state.bus = pci_register_bus(&d->busdev.qdev, "pci",
+    d->host_state.bus = pci_register_bus(dev, "pci",
                                          pci_grackle_set_irq,
                                          pci_grackle_map_irq,
                                          pic,
@@ -102,7 +104,7 @@  static int pci_grackle_init_device(SysBusDevice *dev)
 {
     GrackleState *s;
 
-    s = FROM_SYSBUS(GrackleState, dev);
+    s = GRACKLE_PCI_HOST(dev);
 
     memory_region_init_io(&s->host_state.conf_mem, &pci_host_conf_le_ops,
                           &s->host_state, "pci-conf-idx", 0x1000);
@@ -150,9 +152,9 @@  static void pci_grackle_class_init(ObjectClass *klass, void *data)
     dc->no_user = 1;
 }
 
-static TypeInfo grackle_pci_host_info = {
-    .name          = "grackle-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+static const TypeInfo grackle_pci_host_info = {
+    .name          = TYPE_GRACKLE_PCI_HOST,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(GrackleState),
     .class_init    = pci_grackle_class_init,
 };
diff --git a/hw/gt64xxx.c b/hw/gt64xxx.c
index a2d0e5a..9ad69b8 100644
--- a/hw/gt64xxx.c
+++ b/hw/gt64xxx.c
@@ -229,9 +229,14 @@ 
     target_phys_addr_t regname ##_length;     \
     MemoryRegion regname ##_mem
 
+#define TYPE_GT64120_PCI_HOST "gt64120"
+
+#define GT64120_PCI_HOST(obj) \
+    OBJECT_CHECK(GT64120State, (obj), TYPE_GT64120_PCI_HOST)
+
 typedef struct GT64120State {
-    SysBusDevice busdev;
     PCIHostState pci;
+
     uint32_t regs[GT_REGS];
     PCI_MAPPING_ENTRY(PCI0IO);
     PCI_MAPPING_ENTRY(ISD);
@@ -1083,15 +1088,13 @@  static void gt64120_reset(void *opaque)
 
 PCIBus *gt64120_register(qemu_irq *pic)
 {
-    SysBusDevice *s;
     GT64120State *d;
     DeviceState *dev;
 
-    dev = qdev_create(NULL, "gt64120");
+    dev = qdev_create(NULL, TYPE_GT64120_PCI_HOST);
     qdev_init_nofail(dev);
-    s = sysbus_from_qdev(dev);
-    d = FROM_SYSBUS(GT64120State, s);
-    d->pci.bus = pci_register_bus(&d->busdev.qdev, "pci",
+    d = GT64120_PCI_HOST(dev);
+    d->pci.bus = pci_register_bus(dev, "pci",
                                   gt64120_pci_set_irq, gt64120_pci_map_irq,
                                   pic,
                                   get_system_memory(),
@@ -1107,7 +1110,7 @@  static int gt64120_init(SysBusDevice *dev)
 {
     GT64120State *s;
 
-    s = FROM_SYSBUS(GT64120State, dev);
+    s = GT64120_PCI_HOST(dev);
 
     /* FIXME: This value is computed from registers during reset, but some
        devices (e.g. VGA card) need to know it when they are registered.
@@ -1161,9 +1164,9 @@  static void gt64120_class_init(ObjectClass *klass, void *data)
     sdc->init = gt64120_init;
 }
 
-static TypeInfo gt64120_info = {
-    .name          = "gt64120",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+static const TypeInfo gt64120_info = {
+    .name          = TYPE_GT64120_PCI_HOST,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(GT64120State),
     .class_init    = gt64120_class_init,
 };
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 09e84f5..ee53d78 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -36,7 +36,9 @@ 
  * http://download.intel.com/design/chipsets/datashts/29054901.pdf
  */
 
-typedef PCIHostState I440FXState;
+typedef struct I440FXState {
+    PCIHostState parent_obj;
+} I440FXState;
 
 #define PIIX_NUM_PIC_IRQS       16      /* i8259 * 2 */
 #define PIIX_NUM_PIRQS          4ULL    /* PIRQ[A-D] */
@@ -224,7 +226,7 @@  static const VMStateDescription vmstate_i440fx = {
 
 static int i440fx_pcihost_initfn(SysBusDevice *dev)
 {
-    I440FXState *s = FROM_SYSBUS(I440FXState, dev);
+    PCIHostState *s = PCI_HOST(dev);
 
     memory_region_init_io(&s->conf_mem, &pci_host_conf_le_ops, s,
                           "pci-conf-idx", 4);
@@ -266,12 +268,12 @@  static PCIBus *i440fx_common_init(const char *device_name,
     DeviceState *dev;
     PCIBus *b;
     PCIDevice *d;
-    I440FXState *s;
+    PCIHostState *s;
     PIIX3State *piix3;
     PCII440FXState *f;
 
     dev = qdev_create(NULL, "i440FX-pcihost");
-    s = FROM_SYSBUS(I440FXState, sysbus_from_qdev(dev));
+    s = PCI_HOST(dev);
     s->address_space = address_space_mem;
     b = pci_bus_new(&s->busdev.qdev, NULL, pci_address_space,
                     address_space_io, 0);
@@ -581,9 +583,9 @@  static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
     dc->no_user = 1;
 }
 
-static TypeInfo i440fx_pcihost_info = {
+static const TypeInfo i440fx_pcihost_info = {
     .name          = "i440FX-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(I440FXState),
     .class_init    = i440fx_pcihost_class_init,
 };
diff --git a/hw/ppc4xx_pci.c b/hw/ppc4xx_pci.c
index 203c3cd..334b9a6 100644
--- a/hw/ppc4xx_pci.c
+++ b/hw/ppc4xx_pci.c
@@ -393,9 +393,9 @@  static void ppc4xx_pcihost_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &vmstate_ppc4xx_pci;
 }
 
-static TypeInfo ppc4xx_pcihost_info = {
+static const TypeInfo ppc4xx_pcihost_info = {
     .name          = "ppc4xx-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(PPC4xxPCIState),
     .class_init    = ppc4xx_pcihost_class_init,
 };
diff --git a/hw/ppc_mac.h b/hw/ppc_mac.h
index af75e45..277ffb6 100644
--- a/hw/ppc_mac.h
+++ b/hw/ppc_mac.h
@@ -55,6 +55,7 @@  qemu_irq *heathrow_pic_init(MemoryRegion **pmem,
                             int nb_cpus, qemu_irq **irqs);
 
 /* Grackle PCI */
+#define TYPE_GRACKLE_PCI_HOST "grackle-pcihost"
 PCIBus *pci_grackle_init(uint32_t base, qemu_irq *pic,
                          MemoryRegion *address_space_mem,
                          MemoryRegion *address_space_io);
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index be2b268..8bbce0e 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -470,7 +470,6 @@  static void ppc_prep_init (ram_addr_t ram_size,
     uint32_t kernel_base, initrd_base;
     long kernel_size, initrd_size;
     DeviceState *dev;
-    SysBusDevice *sys;
     PCIHostState *pcihost;
     PCIBus *pci_bus;
     PCIDevice *pci;
@@ -583,8 +582,7 @@  static void ppc_prep_init (ram_addr_t ram_size,
     }
 
     dev = qdev_create(NULL, "raven-pcihost");
-    sys = sysbus_from_qdev(dev);
-    pcihost = DO_UPCAST(PCIHostState, busdev, sys);
+    pcihost = PCI_HOST(dev);
     pcihost->address_space = get_system_memory();
     object_property_add_child(qdev_get_machine(), "raven", OBJECT(dev), NULL);
     qdev_init_nofail(dev);
diff --git a/hw/ppce500_pci.c b/hw/ppce500_pci.c
index 0f60b24..e1acf50 100644
--- a/hw/ppce500_pci.c
+++ b/hw/ppce500_pci.c
@@ -74,6 +74,7 @@  struct pci_inbound {
 
 struct PPCE500PCIState {
     PCIHostState pci_state;
+
     struct pci_outbound pob[PPCE500_PCI_NR_POBS];
     struct pci_inbound pib[PPCE500_PCI_NR_PIBS];
     uint32_t gasket_time;
@@ -310,7 +311,7 @@  static int e500_pcihost_initfn(SysBusDevice *dev)
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *address_space_io = get_system_io();
 
-    h = FROM_SYSBUS(PCIHostState, sysbus_from_qdev(dev));
+    h = PCI_HOST(dev);
     s = DO_UPCAST(PPCE500PCIState, pci_state, h);
 
     for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
@@ -366,9 +367,9 @@  static void e500_pcihost_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &vmstate_ppce500_pci;
 }
 
-static TypeInfo e500_pcihost_info = {
+static const TypeInfo e500_pcihost_info = {
     .name          = "e500-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(PPCE500PCIState),
     .class_init    = e500_pcihost_class_init,
 };
diff --git a/hw/prep_pci.c b/hw/prep_pci.c
index 3e9f6b8..73c9d04 100644
--- a/hw/prep_pci.c
+++ b/hw/prep_pci.c
@@ -30,6 +30,7 @@ 
 
 typedef struct PRePPCIState {
     PCIHostState host_state;
+
     MemoryRegion intack;
     qemu_irq irq[4];
 } PREPPCIState;
@@ -96,7 +97,7 @@  static void prep_set_irq(void *opaque, int irq_num, int level)
 
 static int raven_pcihost_init(SysBusDevice *dev)
 {
-    PCIHostState *h = FROM_SYSBUS(PCIHostState, dev);
+    PCIHostState *h = PCI_HOST(dev);
     PREPPCIState *s = DO_UPCAST(PREPPCIState, host_state, h);
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *address_space_io = get_system_io();
diff --git a/hw/spapr_pci.c b/hw/spapr_pci.c
index 25b400a..bb49a4b 100644
--- a/hw/spapr_pci.c
+++ b/hw/spapr_pci.c
@@ -267,7 +267,7 @@  static const MemoryRegionOps spapr_io_ops = {
  */
 static int spapr_phb_init(SysBusDevice *s)
 {
-    sPAPRPHBState *phb = FROM_SYSBUS(sPAPRPHBState, s);
+    sPAPRPHBState *phb = SPAPR_PCI_HOST_BRIDGE(s);
     char *namebuf;
     int i;
     PCIBus *bus;
@@ -304,7 +304,7 @@  static int spapr_phb_init(SysBusDevice *s)
     memory_region_add_subregion(get_system_memory(), phb->io_win_addr,
                                 &phb->iowindow);
 
-    bus = pci_register_bus(&phb->busdev.qdev,
+    bus = pci_register_bus(DEVICE(s),
                            phb->busname ? phb->busname : phb->dtbusname,
                            pci_spapr_set_irq, pci_spapr_map_irq, phb,
                            &phb->memspace, &phb->iospace,
@@ -354,9 +354,9 @@  static void spapr_phb_class_init(ObjectClass *klass, void *data)
     spapr_rtas_register("ibm,write-pci-config", rtas_ibm_write_pci_config);
 }
 
-static TypeInfo spapr_phb_info = {
-    .name          = "spapr-pci-host-bridge",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+static const TypeInfo spapr_phb_info = {
+    .name          = TYPE_SPAPR_PCI_HOST_BRIDGE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(sPAPRPHBState),
     .class_init    = spapr_phb_class_init,
 };
@@ -368,7 +368,7 @@  void spapr_create_phb(sPAPREnvironment *spapr,
 {
     DeviceState *dev;
 
-    dev = qdev_create(NULL, spapr_phb_info.name);
+    dev = qdev_create(NULL, TYPE_SPAPR_PCI_HOST_BRIDGE);
 
     if (busname) {
         qdev_prop_set_string(dev, "busname", g_strdup(busname));
@@ -474,8 +474,9 @@  int spapr_populate_pci_devices(sPAPRPHBState *phb,
     return 0;
 }
 
-static void register_types(void)
+static void spapr_pci_register_types(void)
 {
     type_register_static(&spapr_phb_info);
 }
-type_init(register_types)
+
+type_init(spapr_pci_register_types)
diff --git a/hw/spapr_pci.h b/hw/spapr_pci.h
index f54c2e8..0244664 100644
--- a/hw/spapr_pci.h
+++ b/hw/spapr_pci.h
@@ -27,8 +27,12 @@ 
 #include "hw/pci_host.h"
 #include "hw/xics.h"
 
+#define TYPE_SPAPR_PCI_HOST_BRIDGE "spapr-pci-host-bridge"
+
+#define SPAPR_PCI_HOST_BRIDGE(obj) \
+    OBJECT_CHECK(sPAPRPHBState, (obj), TYPE_SPAPR_PCI_HOST_BRIDGE)
+
 typedef struct sPAPRPHBState {
-    SysBusDevice busdev;
     PCIHostState host_state;
 
     uint64_t buid;
diff --git a/hw/unin_pci.c b/hw/unin_pci.c
index 409bcd4..351cdef 100644
--- a/hw/unin_pci.c
+++ b/hw/unin_pci.c
@@ -40,6 +40,7 @@  static const int unin_irq_line[] = { 0x1b, 0x1c, 0x1d, 0x1e };
 
 typedef struct UNINState {
     PCIHostState host_state;
+
     MemoryRegion pci_mmio;
     MemoryRegion pci_hole;
 } UNINState;
@@ -432,9 +433,9 @@  static void pci_u3_agp_class_init(ObjectClass *klass, void *data)
     sbc->init = pci_u3_agp_init_device;
 }
 
-static TypeInfo pci_u3_agp_info = {
+static const TypeInfo pci_u3_agp_info = {
     .name          = "u3-agp-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_u3_agp_class_init,
 };
@@ -446,9 +447,9 @@  static void pci_unin_agp_class_init(ObjectClass *klass, void *data)
     sbc->init = pci_unin_agp_init_device;
 }
 
-static TypeInfo pci_unin_agp_info = {
+static const TypeInfo pci_unin_agp_info = {
     .name          = "uni-north-agp-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_unin_agp_class_init,
 };
@@ -460,9 +461,9 @@  static void pci_unin_internal_class_init(ObjectClass *klass, void *data)
     sbc->init = pci_unin_internal_init_device;
 }
 
-static TypeInfo pci_unin_internal_info = {
+static const TypeInfo pci_unin_internal_info = {
     .name          = "uni-north-internal-pci-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_unin_internal_class_init,
 };