diff --git a/hw/alpha_typhoon.c b/hw/alpha_typhoon.c
index 10e588a..7667412 100644
--- a/hw/alpha_typhoon.c
+++ b/hw/alpha_typhoon.c
@@ -715,7 +715,7 @@ PCIBus *typhoon_init(ram_addr_t ram_size, ISABus **isa_bus,
     qdev_init_nofail(dev);
 
     s = TYPHOON_PCI_HOST_BRIDGE(dev);
-    phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(dev));
+    phb = PCI_HOST_BRIDGE(dev);
 
     /* Remember the CPUs so that we can deliver interrupts to them.  */
     for (i = 0; i < 4; i++) {
@@ -825,7 +825,7 @@ static void typhoon_pcihost_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo typhoon_pcihost_info = {
     .name          = TYPE_TYPHOON_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(TyphoonState),
     .class_init    = typhoon_pcihost_class_init,
 };
diff --git a/hw/bonito.c b/hw/bonito.c
index 062c701..6084ac4 100644
--- a/hw/bonito.c
+++ b/hw/bonito.c
@@ -416,7 +416,7 @@ static const MemoryRegionOps bonito_cop_ops = {
 static uint32_t bonito_sbridge_pciaddr(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t cfgaddr;
     uint32_t idsel;
     uint32_t devno;
@@ -454,7 +454,7 @@ static void bonito_spciconf_writeb(void *opaque, target_phys_addr_t addr,
 {
     PCIBonitoState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -480,7 +480,7 @@ static void bonito_spciconf_writew(void *opaque, target_phys_addr_t addr,
 {
     PCIBonitoState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -508,7 +508,7 @@ static void bonito_spciconf_writel(void *opaque, target_phys_addr_t addr,
 {
     PCIBonitoState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -535,7 +535,7 @@ static uint32_t bonito_spciconf_readb(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -561,7 +561,7 @@ static uint32_t bonito_spciconf_readw(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -589,7 +589,7 @@ static uint32_t bonito_spciconf_readl(void *opaque, target_phys_addr_t addr)
 {
     PCIBonitoState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, SYS_BUS_DEVICE(s->pcihost));
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
     uint32_t pciaddr;
     uint16_t status;
 
@@ -702,7 +702,7 @@ static const VMStateDescription vmstate_bonito = {
 
 static int bonito_pcihost_initfn(SysBusDevice *dev)
 {
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, dev);
+    PCIHostState *phb = PCI_HOST_BRIDGE(dev);
 
     phb->bus = pci_register_bus(DEVICE(dev), "pci",
                                 pci_bonito_set_irq, pci_bonito_map_irq, dev,
@@ -716,7 +716,7 @@ static int bonito_initfn(PCIDevice *dev)
 {
     PCIBonitoState *s = DO_UPCAST(PCIBonitoState, dev, dev);
     SysBusDevice *sysbus = SYS_BUS_DEVICE(s->pcihost);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, sysbus);
+    PCIHostState *phb = PCI_HOST_BRIDGE(s->pcihost);
 
     /* Bonito North Bridge, built on FPGA, VENDOR_ID/DEVICE_ID are "undefined" */
     pci_config_set_prog_interface(dev->config, 0x00);
@@ -785,7 +785,7 @@ PCIBus *bonito_init(qemu_irq *pic)
     PCIDevice *d;
 
     dev = qdev_create(NULL, TYPE_BONITO_PCI_HOST_BRIDGE);
-    phb = FROM_SYSBUS(PCIHostState, sysbus_from_qdev(dev));
+    phb = PCI_HOST_BRIDGE(dev);
     pcihost = BONITO_PCI_HOST_BRIDGE(dev);
     pcihost->pic = pic;
     qdev_init_nofail(dev);
@@ -833,7 +833,7 @@ static void bonito_pcihost_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo bonito_pcihost_info = {
     .name          = TYPE_BONITO_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(BonitoState),
     .class_init    = bonito_pcihost_class_init,
 };
diff --git a/hw/dec_pci.c b/hw/dec_pci.c
index 19aed1b..de16361 100644
--- a/hw/dec_pci.c
+++ b/hw/dec_pci.c
@@ -91,7 +91,7 @@ static int pci_dec_21154_device_init(SysBusDevice *dev)
 {
     PCIHostState *phb;
 
-    phb = FROM_SYSBUS(PCIHostState, dev);
+    phb = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&phb->conf_mem, &pci_host_conf_le_ops,
                           dev, "pci-conf-idx", 0x1000);
@@ -136,7 +136,7 @@ static void pci_dec_21154_device_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo pci_dec_21154_device_info = {
     .name          = TYPE_DEC_21154,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(DECState),
     .class_init    = pci_dec_21154_device_class_init,
 };
diff --git a/hw/grackle_pci.c b/hw/grackle_pci.c
index d814270..066f6e1 100644
--- a/hw/grackle_pci.c
+++ b/hw/grackle_pci.c
@@ -73,7 +73,7 @@ PCIBus *pci_grackle_init(uint32_t base, qemu_irq *pic,
     dev = qdev_create(NULL, TYPE_GRACKLE_PCI_HOST_BRIDGE);
     qdev_init_nofail(dev);
     s = SYS_BUS_DEVICE(dev);
-    phb = FROM_SYSBUS(PCIHostState, s);
+    phb = PCI_HOST_BRIDGE(dev);
     d = GRACKLE_PCI_HOST_BRIDGE(dev);
 
     memory_region_init(&d->pci_mmio, "pci-mmio", 0x100000000ULL);
@@ -102,7 +102,7 @@ static int pci_grackle_init_device(SysBusDevice *dev)
 {
     PCIHostState *phb;
 
-    phb = FROM_SYSBUS(PCIHostState, dev);
+    phb = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&phb->conf_mem, &pci_host_conf_le_ops,
                           dev, "pci-conf-idx", 0x1000);
@@ -151,7 +151,7 @@ static void pci_grackle_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo grackle_pci_host_info = {
     .name          = TYPE_GRACKLE_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(GrackleState),
     .class_init    = pci_grackle_class_init,
 };
diff --git a/hw/gt64xxx.c b/hw/gt64xxx.c
index 0677299..857758e 100644
--- a/hw/gt64xxx.c
+++ b/hw/gt64xxx.c
@@ -1095,7 +1095,7 @@ PCIBus *gt64120_register(qemu_irq *pic)
     dev = qdev_create(NULL, TYPE_GT64120_PCI_HOST_BRIDGE);
     qdev_init_nofail(dev);
     d = GT64120_PCI_HOST_BRIDGE(dev);
-    phb = &d->pci;
+    phb = PCI_HOST_BRIDGE(dev);
     phb->bus = pci_register_bus(dev, "pci",
                                 gt64120_pci_set_irq, gt64120_pci_map_irq,
                                 pic,
@@ -1168,7 +1168,7 @@ static void gt64120_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo gt64120_info = {
     .name          = TYPE_GT64120_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(GT64120State),
     .class_init    = gt64120_class_init,
 };
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 0b06a75..04ceccf 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -225,7 +225,7 @@ static const VMStateDescription vmstate_i440fx = {
 
 static int i440fx_pcihost_initfn(SysBusDevice *dev)
 {
-    I440FXState *s = FROM_SYSBUS(I440FXState, dev);
+    PCIHostState *s = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&s->conf_mem, &pci_host_conf_le_ops, s,
                           "pci-conf-idx", 4);
@@ -267,12 +267,12 @@ 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_BRIDGE(dev);
     s->address_space = address_space_mem;
     b = pci_bus_new(&s->busdev.qdev, NULL, pci_address_space,
                     address_space_io, 0);
@@ -603,7 +603,7 @@ static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo i440fx_pcihost_info = {
     .name          = "i440FX-pcihost",
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(I440FXState),
     .class_init    = i440fx_pcihost_class_init,
 };
diff --git a/hw/ppc4xx_pci.c b/hw/ppc4xx_pci.c
index 599a75a..5583321 100644
--- a/hw/ppc4xx_pci.c
+++ b/hw/ppc4xx_pci.c
@@ -338,7 +338,7 @@ static int ppc4xx_pcihost_initfn(SysBusDevice *dev)
     PCIBus *b;
     int i;
 
-    h = FROM_SYSBUS(PCIHostState, dev);
+    h = PCI_HOST_BRIDGE(dev);
     s = PPC4xx_PCI_HOST_BRIDGE(dev);
 
     for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
@@ -398,7 +398,7 @@ static void ppc4xx_pcihost_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo ppc4xx_pcihost_info = {
     .name          = TYPE_PPC4xx_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(PPC4xxPCIState),
     .class_init    = ppc4xx_pcihost_class_init,
 };
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 7a87616..592b7b2 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -471,7 +471,6 @@ 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;
@@ -584,8 +583,7 @@ 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_BRIDGE(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 e4f065a..3333967 100644
--- a/hw/ppce500_pci.c
+++ b/hw/ppce500_pci.c
@@ -316,7 +316,7 @@ 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, dev);
+    h = PCI_HOST_BRIDGE(dev);
     s = PPC_E500_PCI_HOST_BRIDGE(dev);
 
     for (i = 0; i < ARRAY_SIZE(s->irq); i++) {
@@ -374,7 +374,7 @@ static void e500_pcihost_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo e500_pcihost_info = {
     .name          = TYPE_PPC_E500_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(PPCE500PCIState),
     .class_init    = e500_pcihost_class_init,
 };
diff --git a/hw/prep_pci.c b/hw/prep_pci.c
index 69c19df..35cb9b2 100644
--- a/hw/prep_pci.c
+++ b/hw/prep_pci.c
@@ -103,7 +103,7 @@ 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_BRIDGE(dev);
     PREPPCIState *s = RAVEN_PCI_HOST_BRIDGE(dev);
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *address_space_io = get_system_io();
@@ -192,7 +192,7 @@ static void raven_pcihost_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo raven_pcihost_info = {
     .name = TYPE_RAVEN_PCI_HOST_BRIDGE,
-    .parent = TYPE_SYS_BUS_DEVICE,
+    .parent = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(PREPPCIState),
     .class_init = raven_pcihost_class_init,
 };
diff --git a/hw/spapr.c b/hw/spapr.c
index f8b53e9..c34b767 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -743,7 +743,7 @@ static void ppc_spapr_init(ram_addr_t ram_size,
                      SPAPR_PCI_MEM_WIN_SIZE,
                      SPAPR_PCI_IO_WIN_ADDR,
                      SPAPR_PCI_MSI_WIN_ADDR);
-    phb = &QLIST_FIRST(&spapr->phbs)->host_state;
+    phb = PCI_HOST_BRIDGE(QLIST_FIRST(&spapr->phbs));
 
     for (i = 0; i < nb_nics; i++) {
         NICInfo *nd = &nd_table[i];
diff --git a/hw/spapr_pci.c b/hw/spapr_pci.c
index f9dd2a8..661c05b 100644
--- a/hw/spapr_pci.c
+++ b/hw/spapr_pci.c
@@ -64,7 +64,7 @@ static PCIDevice *find_dev(sPAPREnvironment *spapr, uint64_t buid,
                            uint32_t config_addr)
 {
     sPAPRPHBState *sphb = find_phb(spapr, buid);
-    PCIHostState *phb = &sphb->host_state;
+    PCIHostState *phb = PCI_HOST_BRIDGE(sphb);
     BusState *bus = BUS(phb->bus);
     BusChild *kid;
     int devfn = (config_addr >> 8) & 0xFF;
@@ -517,7 +517,7 @@ static DMAContext *spapr_pci_dma_context_fn(PCIBus *bus, void *opaque,
 static int spapr_phb_init(SysBusDevice *s)
 {
     sPAPRPHBState *sphb = SPAPR_PCI_HOST_BRIDGE(s);
-    PCIHostState *phb = FROM_SYSBUS(PCIHostState, s);
+    PCIHostState *phb = PCI_HOST_BRIDGE(s);
     char *namebuf;
     int i;
     PCIBus *bus;
@@ -617,7 +617,7 @@ static void spapr_phb_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo spapr_phb_info = {
     .name          = TYPE_SPAPR_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(sPAPRPHBState),
     .class_init    = spapr_phb_class_init,
 };
diff --git a/hw/unin_pci.c b/hw/unin_pci.c
index 1fc8920..0db7c1f 100644
--- a/hw/unin_pci.c
+++ b/hw/unin_pci.c
@@ -148,7 +148,7 @@ static int pci_unin_main_init_device(SysBusDevice *dev)
 
     /* Use values found on a real PowerMac */
     /* Uninorth main bus */
-    h = FROM_SYSBUS(PCIHostState, dev);
+    h = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&h->conf_mem, &pci_host_conf_le_ops,
                           dev, "pci-conf-idx", 0x1000);
@@ -166,7 +166,7 @@ static int pci_u3_agp_init_device(SysBusDevice *dev)
     PCIHostState *h;
 
     /* Uninorth U3 AGP bus */
-    h = FROM_SYSBUS(PCIHostState, dev);
+    h = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&h->conf_mem, &pci_host_conf_le_ops,
                           dev, "pci-conf-idx", 0x1000);
@@ -183,7 +183,7 @@ static int pci_unin_agp_init_device(SysBusDevice *dev)
     PCIHostState *h;
 
     /* Uninorth AGP bus */
-    h = FROM_SYSBUS(PCIHostState, dev);
+    h = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&h->conf_mem, &pci_host_conf_le_ops,
                           dev, "pci-conf-idx", 0x1000);
@@ -199,7 +199,7 @@ static int pci_unin_internal_init_device(SysBusDevice *dev)
     PCIHostState *h;
 
     /* Uninorth internal bus */
-    h = FROM_SYSBUS(PCIHostState, dev);
+    h = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&h->conf_mem, &pci_host_conf_le_ops,
                           dev, "pci-conf-idx", 0x1000);
@@ -224,7 +224,7 @@ PCIBus *pci_pmac_init(qemu_irq *pic,
     dev = qdev_create(NULL, TYPE_UNI_NORTH_PCI_HOST_BRIDGE);
     qdev_init_nofail(dev);
     s = SYS_BUS_DEVICE(dev);
-    h = FROM_SYSBUS(PCIHostState, s);
+    h = PCI_HOST_BRIDGE(s);
     d = UNI_NORTH_PCI_HOST_BRIDGE(dev);
     memory_region_init(&d->pci_mmio, "pci-mmio", 0x100000000ULL);
     memory_region_init_alias(&d->pci_hole, "pci-hole", &d->pci_mmio,
@@ -289,7 +289,7 @@ PCIBus *pci_pmac_u3_init(qemu_irq *pic,
     dev = qdev_create(NULL, TYPE_U3_AGP_HOST_BRIDGE);
     qdev_init_nofail(dev);
     s = SYS_BUS_DEVICE(dev);
-    h = FROM_SYSBUS(PCIHostState, s);
+    h = PCI_HOST_BRIDGE(dev);
     d = U3_AGP_HOST_BRIDGE(dev);
 
     memory_region_init(&d->pci_mmio, "pci-mmio", 0x100000000ULL);
@@ -427,7 +427,7 @@ static void pci_unin_main_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo pci_unin_main_info = {
     .name          = TYPE_UNI_NORTH_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_unin_main_class_init,
 };
@@ -441,7 +441,7 @@ static void pci_u3_agp_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo pci_u3_agp_info = {
     .name          = TYPE_U3_AGP_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_u3_agp_class_init,
 };
@@ -455,7 +455,7 @@ static void pci_unin_agp_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo pci_unin_agp_info = {
     .name          = TYPE_UNI_NORTH_AGP_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_unin_agp_class_init,
 };
@@ -469,7 +469,7 @@ static void pci_unin_internal_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo pci_unin_internal_info = {
     .name          = TYPE_UNI_NORTH_INTERNAL_PCI_HOST_BRIDGE,
-    .parent        = TYPE_SYS_BUS_DEVICE,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
     .instance_size = sizeof(UNINState),
     .class_init    = pci_unin_internal_class_init,
 };
