diff --git a/hw/audio/cs4231a.c b/hw/audio/cs4231a.c
index 7d60ce6f0e..0723e39430 100644
--- a/hw/audio/cs4231a.c
+++ b/hw/audio/cs4231a.c
@@ -677,7 +677,7 @@ static void cs4231a_realizefn (DeviceState *dev, Error **errp)
         return;
     }
 
-    isa_init_irq(d, &s->pic, s->irq);
+    s->pic = isa_get_irq(d, s->irq);
     k = ISADMA_GET_CLASS(s->isa_dma);
     k->register_channel(s->isa_dma, s->dma, cs_dma_read, s);
 
diff --git a/hw/audio/gus.c b/hw/audio/gus.c
index e8719ee117..42f010b671 100644
--- a/hw/audio/gus.c
+++ b/hw/audio/gus.c
@@ -282,7 +282,7 @@ static void gus_realizefn (DeviceState *dev, Error **errp)
     s->emu.himemaddr = s->himem;
     s->emu.gusdatapos = s->emu.himemaddr + 1024 * 1024 + 32;
     s->emu.opaque = s;
-    isa_init_irq (d, &s->pic, s->emu.gusirq);
+    s->pic = isa_get_irq(d, s->emu.gusirq);
 
     AUD_set_active_out (s->voice, 1);
 }
diff --git a/hw/audio/sb16.c b/hw/audio/sb16.c
index 60f1f75e3a..2215386ddb 100644
--- a/hw/audio/sb16.c
+++ b/hw/audio/sb16.c
@@ -1408,7 +1408,7 @@ static void sb16_realizefn (DeviceState *dev, Error **errp)
         return;
     }
 
-    isa_init_irq (isadev, &s->pic, s->irq);
+    s->pic = isa_get_irq(isadev, s->irq);
 
     s->mixer_regs[0x80] = magic_of_irq (s->irq);
     s->mixer_regs[0x81] = (1 << s->dma) | (1 << s->hdma);
diff --git a/hw/block/fdc-isa.c b/hw/block/fdc-isa.c
index ab663dce93..fa20450747 100644
--- a/hw/block/fdc-isa.c
+++ b/hw/block/fdc-isa.c
@@ -94,7 +94,7 @@ static void isabus_fdc_realize(DeviceState *dev, Error **errp)
                              isa->iobase, fdc_portio_list, fdctrl,
                              "fdc");
 
-    isa_init_irq(isadev, &fdctrl->irq, isa->irq);
+    fdctrl->irq = isa_get_irq(isadev, isa->irq);
     fdctrl->dma_chann = isa->dma;
     if (fdctrl->dma_chann != -1) {
         IsaDmaClass *k;
diff --git a/hw/char/parallel.c b/hw/char/parallel.c
index b45e67bfbb..adb9bd9be3 100644
--- a/hw/char/parallel.c
+++ b/hw/char/parallel.c
@@ -553,7 +553,7 @@ static void parallel_isa_realizefn(DeviceState *dev, Error **errp)
     index++;
 
     base = isa->iobase;
-    isa_init_irq(isadev, &s->irq, isa->isairq);
+    s->irq = isa_get_irq(isadev, isa->isairq);
     qemu_register_reset(parallel_reset, s);
 
     qemu_chr_fe_set_handlers(&s->chr, parallel_can_receive, NULL,
diff --git a/hw/char/serial-isa.c b/hw/char/serial-isa.c
index 1b8b303079..7a7ed239cd 100644
--- a/hw/char/serial-isa.c
+++ b/hw/char/serial-isa.c
@@ -75,7 +75,7 @@ static void serial_isa_realizefn(DeviceState *dev, Error **errp)
     }
     index++;
 
-    isa_init_irq(isadev, &s->irq, isa->isairq);
+    s->irq = isa_get_irq(isadev, isa->isairq);
     qdev_realize(DEVICE(s), NULL, errp);
     qdev_set_legacy_instance_id(dev, isa->iobase, 3);
 
diff --git a/hw/ide/isa.c b/hw/ide/isa.c
index 24bbde24c2..8bedbd13f1 100644
--- a/hw/ide/isa.c
+++ b/hw/ide/isa.c
@@ -75,7 +75,7 @@ static void isa_ide_realizefn(DeviceState *dev, Error **errp)
 
     ide_bus_init(&s->bus, sizeof(s->bus), dev, 0, 2);
     ide_init_ioport(&s->bus, isadev, s->iobase, s->iobase2);
-    isa_init_irq(isadev, &s->irq, s->isairq);
+    s->irq = isa_get_irq(isadev, s->isairq);
     ide_init2(&s->bus, s->irq);
     vmstate_register(VMSTATE_IF(dev), 0, &vmstate_ide_isa, s);
     ide_register_restart_cb(&s->bus);
diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index baba62f357..1773db0d25 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -26,6 +26,7 @@
 #include "qemu/error-report.h"
 #include "qemu/log.h"
 #include "qemu/timer.h"
+#include "qapi/error.h"
 #include "hw/isa/isa.h"
 #include "migration/vmstate.h"
 #include "hw/acpi/aml-build.h"
@@ -671,6 +672,8 @@ struct ISAKBDState {
     KBDState kbd;
     bool kbd_throttle;
     MemoryRegion io[2];
+    uint8_t kbd_irq;
+    uint8_t mouse_irq;
 };
 
 void i8042_isa_mouse_fake_event(ISAKBDState *isa)
@@ -734,8 +737,20 @@ static void i8042_realizefn(DeviceState *dev, Error **errp)
     ISAKBDState *isa_s = I8042(dev);
     KBDState *s = &isa_s->kbd;
 
-    isa_init_irq(isadev, &s->irq_kbd, 1);
-    isa_init_irq(isadev, &s->irq_mouse, 12);
+    if (isa_s->kbd_irq >= ISA_NUM_IRQS) {
+        error_setg(errp, "Maximum value for \"kbd-irq\" is: %u",
+                   ISA_NUM_IRQS - 1);
+        return;
+    }
+
+    if (isa_s->mouse_irq >= ISA_NUM_IRQS) {
+        error_setg(errp, "Maximum value for \"mouse-irq\" is: %u",
+                   ISA_NUM_IRQS - 1);
+        return;
+    }
+
+    s->irq_kbd = isa_get_irq(isadev, isa_s->kbd_irq);
+    s->irq_mouse = isa_get_irq(isadev, isa_s->mouse_irq);
 
     isa_register_ioport(isadev, isa_s->io + 0, 0x60);
     isa_register_ioport(isadev, isa_s->io + 1, 0x64);
@@ -754,6 +769,7 @@ static void i8042_realizefn(DeviceState *dev, Error **errp)
 
 static void i8042_build_aml(ISADevice *isadev, Aml *scope)
 {
+    ISAKBDState *isa_s = I8042(isadev);
     Aml *kbd;
     Aml *mou;
     Aml *crs;
@@ -761,7 +777,7 @@ static void i8042_build_aml(ISADevice *isadev, Aml *scope)
     crs = aml_resource_template();
     aml_append(crs, aml_io(AML_DECODE16, 0x0060, 0x0060, 0x01, 0x01));
     aml_append(crs, aml_io(AML_DECODE16, 0x0064, 0x0064, 0x01, 0x01));
-    aml_append(crs, aml_irq_no_flags(1));
+    aml_append(crs, aml_irq_no_flags(isa_s->kbd_irq));
 
     kbd = aml_device("KBD");
     aml_append(kbd, aml_name_decl("_HID", aml_eisaid("PNP0303")));
@@ -769,7 +785,7 @@ static void i8042_build_aml(ISADevice *isadev, Aml *scope)
     aml_append(kbd, aml_name_decl("_CRS", crs));
 
     crs = aml_resource_template();
-    aml_append(crs, aml_irq_no_flags(12));
+    aml_append(crs, aml_irq_no_flags(isa_s->mouse_irq));
 
     mou = aml_device("MOU");
     aml_append(mou, aml_name_decl("_HID", aml_eisaid("PNP0F13")));
@@ -783,6 +799,8 @@ static void i8042_build_aml(ISADevice *isadev, Aml *scope)
 static Property i8042_properties[] = {
     DEFINE_PROP_BOOL("extended-state", ISAKBDState, kbd.extended_state, true),
     DEFINE_PROP_BOOL("kbd-throttle", ISAKBDState, kbd_throttle, false),
+    DEFINE_PROP_UINT8("kbd-irq", ISAKBDState, kbd_irq, 1),
+    DEFINE_PROP_UINT8("mouse-irq", ISAKBDState, mouse_irq, 12),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/ipmi/isa_ipmi_bt.c b/hw/ipmi/isa_ipmi_bt.c
index 02625eb94e..88aa734e9e 100644
--- a/hw/ipmi/isa_ipmi_bt.c
+++ b/hw/ipmi/isa_ipmi_bt.c
@@ -92,7 +92,7 @@ static void isa_ipmi_bt_realize(DeviceState *dev, Error **errp)
     }
 
     if (iib->isairq > 0) {
-        isa_init_irq(isadev, &iib->irq, iib->isairq);
+        iib->irq = isa_get_irq(isadev, iib->isairq);
         iib->bt.use_irq = 1;
         iib->bt.raise_irq = isa_ipmi_bt_raise_irq;
         iib->bt.lower_irq = isa_ipmi_bt_lower_irq;
diff --git a/hw/ipmi/isa_ipmi_kcs.c b/hw/ipmi/isa_ipmi_kcs.c
index 3b23ad08b3..afabb95ebe 100644
--- a/hw/ipmi/isa_ipmi_kcs.c
+++ b/hw/ipmi/isa_ipmi_kcs.c
@@ -91,7 +91,7 @@ static void ipmi_isa_realize(DeviceState *dev, Error **errp)
     }
 
     if (iik->isairq > 0) {
-        isa_init_irq(isadev, &iik->irq, iik->isairq);
+        iik->irq = isa_get_irq(isadev, iik->isairq);
         iik->kcs.use_irq = 1;
         iik->kcs.raise_irq = isa_ipmi_kcs_raise_irq;
         iik->kcs.lower_irq = isa_ipmi_kcs_lower_irq;
diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 6c31398dda..0ad1c5fd65 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -21,21 +21,18 @@
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "qapi/error.h"
-#include "monitor/monitor.h"
 #include "hw/sysbus.h"
 #include "sysemu/sysemu.h"
 #include "hw/isa/isa.h"
 
 static ISABus *isabus;
 
-static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
 static char *isabus_get_fw_dev_path(DeviceState *dev);
 
 static void isa_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
 
-    k->print_dev = isabus_dev_print;
     k->get_fw_dev_path = isabus_get_fw_dev_path;
 }
 
@@ -88,19 +85,9 @@ qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
     return isabus->irqs[isairq];
 }
 
-void isa_init_irq(ISADevice *dev, qemu_irq *p, unsigned isairq)
-{
-    assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
-    assert(isairq < ISA_NUM_IRQS);
-    dev->isairq[dev->nirqs] = isairq;
-    *p = isa_get_irq(dev, isairq);
-    dev->nirqs++;
-}
-
 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
 {
-    qemu_irq irq;
-    isa_init_irq(isadev, &irq, isairq);
+    qemu_irq irq = isa_get_irq(isadev, isairq);
     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
 }
 
@@ -153,14 +140,6 @@ int isa_register_portio_list(ISADevice *dev,
     return 0;
 }
 
-static void isa_device_init(Object *obj)
-{
-    ISADevice *dev = ISA_DEVICE(obj);
-
-    dev->isairq[0] = -1;
-    dev->isairq[1] = -1;
-}
-
 ISADevice *isa_new(const char *name)
 {
     return ISA_DEVICE(qdev_new(name));
@@ -222,19 +201,6 @@ void isa_build_aml(ISABus *bus, Aml *scope)
     }
 }
 
-static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
-{
-    ISADevice *d = ISA_DEVICE(dev);
-
-    if (d->isairq[1] != -1) {
-        monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
-                       d->isairq[0], d->isairq[1]);
-    } else if (d->isairq[0] != -1) {
-        monitor_printf(mon, "%*sisa irq %d\n", indent, "",
-                       d->isairq[0]);
-    }
-}
-
 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -260,7 +226,6 @@ static const TypeInfo isa_device_type_info = {
     .name = TYPE_ISA_DEVICE,
     .parent = TYPE_DEVICE,
     .instance_size = sizeof(ISADevice),
-    .instance_init = isa_device_init,
     .abstract = true,
     .class_size = sizeof(ISADeviceClass),
     .class_init = isa_device_class_init,
diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
index 0fe7b69bc4..8607e0ac36 100644
--- a/hw/isa/piix4.c
+++ b/hw/isa/piix4.c
@@ -39,8 +39,6 @@
 #include "sysemu/runstate.h"
 #include "qom/object.h"
 
-PCIDevice *piix4_dev;
-
 struct PIIX4State {
     PCIDevice dev;
     qemu_irq cpu_intr;
@@ -54,6 +52,27 @@ struct PIIX4State {
 
 OBJECT_DECLARE_SIMPLE_TYPE(PIIX4State, PIIX4_PCI_DEVICE)
 
+static void piix4_set_irq(void *opaque, int irq_num, int level)
+{
+    int i, pic_irq, pic_level;
+    PIIX4State *s = opaque;
+    PCIBus *bus = pci_get_bus(&s->dev);
+
+    /* now we change the pic irq level according to the piix irq mappings */
+    /* XXX: optimize */
+    pic_irq = s->dev.config[PIIX_PIRQCA + irq_num];
+    if (pic_irq < ISA_NUM_IRQS) {
+        /* The pic level is the logical OR of all the PCI irqs mapped to it. */
+        pic_level = 0;
+        for (i = 0; i < PIIX_NUM_PIRQS; i++) {
+            if (pic_irq == s->dev.config[PIIX_PIRQCA + i]) {
+                pic_level |= pci_bus_get_irq_level(bus, i);
+            }
+        }
+        qemu_set_irq(s->isa[pic_irq], pic_level);
+    }
+}
+
 static void piix4_isa_reset(DeviceState *dev)
 {
     PIIX4State *d = PIIX4_PCI_DEVICE(dev);
@@ -197,9 +216,7 @@ static void piix4_realize(PCIDevice *dev, Error **errp)
     if (!qdev_realize(DEVICE(&s->rtc), BUS(isa_bus), errp)) {
         return;
     }
-    isa_init_irq(ISA_DEVICE(&s->rtc), &s->rtc.irq, RTC_ISA_IRQ);
-
-    piix4_dev = dev;
+    s->rtc.irq = isa_get_irq(ISA_DEVICE(&s->rtc), s->rtc.isairq);
 }
 
 static void piix4_init(Object *obj)
@@ -248,8 +265,34 @@ static void piix4_register_types(void)
 
 type_init(piix4_register_types)
 
+static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
+{
+    int slot;
+
+    slot = PCI_SLOT(pci_dev->devfn);
+
+    switch (slot) {
+    /* PIIX4 USB */
+    case 10:
+        return 3;
+    /* AMD 79C973 Ethernet */
+    case 11:
+        return 1;
+    /* Crystal 4281 Sound */
+    case 12:
+        return 2;
+    /* PCI slot 1 to 4 */
+    case 18 ... 21:
+        return ((slot - 18) + irq_num) & 0x03;
+    /* Unknown device, don't do any translation */
+    default:
+        return irq_num;
+    }
+}
+
 DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
 {
+    PIIX4State *s;
     PCIDevice *pci;
     DeviceState *dev;
     int devfn = PCI_DEVFN(10, 0);
@@ -257,6 +300,7 @@ DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
     pci = pci_create_simple_multifunction(pci_bus, devfn,  true,
                                           TYPE_PIIX4_PCI_DEVICE);
     dev = DEVICE(pci);
+    s = PIIX4_PCI_DEVICE(pci);
     if (isa_bus) {
         *isa_bus = ISA_BUS(qdev_get_child_bus(dev, "isa.0"));
     }
@@ -271,5 +315,7 @@ DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus)
                                NULL, 0, NULL);
     }
 
+    pci_bus_irqs(pci_bus, piix4_set_irq, pci_slot_get_pirq, s, PIIX_NUM_PIRQS);
+
     return dev;
 }
diff --git a/hw/mips/gt64xxx_pci.c b/hw/mips/gt64xxx_pci.c
index c7480bd019..e0ff1b5566 100644
--- a/hw/mips/gt64xxx_pci.c
+++ b/hw/mips/gt64xxx_pci.c
@@ -26,10 +26,8 @@
 #include "qapi/error.h"
 #include "qemu/units.h"
 #include "qemu/log.h"
-#include "hw/mips/mips.h"
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_host.h"
-#include "hw/southbridge/piix.h"
 #include "migration/vmstate.h"
 #include "hw/intc/i8259.h"
 #include "hw/irq.h"
@@ -981,56 +979,6 @@ static const MemoryRegionOps isd_mem_ops = {
     },
 };
 
-static int gt64120_pci_map_irq(PCIDevice *pci_dev, int irq_num)
-{
-    int slot;
-
-    slot = PCI_SLOT(pci_dev->devfn);
-
-    switch (slot) {
-    /* PIIX4 USB */
-    case 10:
-        return 3;
-    /* AMD 79C973 Ethernet */
-    case 11:
-        return 1;
-    /* Crystal 4281 Sound */
-    case 12:
-        return 2;
-    /* PCI slot 1 to 4 */
-    case 18 ... 21:
-        return ((slot - 18) + irq_num) & 0x03;
-    /* Unknown device, don't do any translation */
-    default:
-        return irq_num;
-    }
-}
-
-static int pci_irq_levels[4];
-
-static void gt64120_pci_set_irq(void *opaque, int irq_num, int level)
-{
-    int i, pic_irq, pic_level;
-    qemu_irq *pic = opaque;
-
-    pci_irq_levels[irq_num] = level;
-
-    /* now we change the pic irq level according to the piix irq mappings */
-    /* XXX: optimize */
-    pic_irq = piix4_dev->config[PIIX_PIRQCA + irq_num];
-    if (pic_irq < 16) {
-        /* The pic level is the logical OR of all the PCI irqs mapped to it. */
-        pic_level = 0;
-        for (i = 0; i < 4; i++) {
-            if (pic_irq == piix4_dev->config[PIIX_PIRQCA + i]) {
-                pic_level |= pci_irq_levels[i];
-            }
-        }
-        qemu_set_irq(pic[pic_irq], pic_level);
-    }
-}
-
-
 static void gt64120_reset(DeviceState *dev)
 {
     GT64120State *s = GT64120_PCI_HOST_BRIDGE(dev);
@@ -1202,32 +1150,18 @@ static void gt64120_reset(DeviceState *dev)
 static void gt64120_realize(DeviceState *dev, Error **errp)
 {
     GT64120State *s = GT64120_PCI_HOST_BRIDGE(dev);
+    PCIHostState *phb = PCI_HOST_BRIDGE(dev);
 
     memory_region_init_io(&s->ISD_mem, OBJECT(dev), &isd_mem_ops, s,
                           "gt64120-isd", 0x1000);
-}
-
-PCIBus *gt64120_register(qemu_irq *pic)
-{
-    GT64120State *d;
-    PCIHostState *phb;
-    DeviceState *dev;
-
-    dev = qdev_new(TYPE_GT64120_PCI_HOST_BRIDGE);
-    d = GT64120_PCI_HOST_BRIDGE(dev);
-    phb = PCI_HOST_BRIDGE(dev);
-    memory_region_init(&d->pci0_mem, OBJECT(dev), "pci0-mem", 4 * GiB);
-    address_space_init(&d->pci0_mem_as, &d->pci0_mem, "pci0-mem");
-    phb->bus = pci_register_root_bus(dev, "pci",
-                                     gt64120_pci_set_irq, gt64120_pci_map_irq,
-                                     pic,
-                                     &d->pci0_mem,
-                                     get_system_io(),
-                                     PCI_DEVFN(18, 0), 4, TYPE_PCI_BUS);
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+    memory_region_init(&s->pci0_mem, OBJECT(dev), "pci0-mem", 4 * GiB);
+    address_space_init(&s->pci0_mem_as, &s->pci0_mem, "pci0-mem");
+    phb->bus = pci_root_bus_new(dev, "pci",
+                                &s->pci0_mem,
+                                get_system_io(),
+                                PCI_DEVFN(18, 0), TYPE_PCI_BUS);
 
     pci_create_simple(phb->bus, PCI_DEVFN(0, 0), "gt64120_pci");
-    return phb->bus;
 }
 
 static void gt64120_pci_realize(PCIDevice *d, Error **errp)
diff --git a/hw/mips/malta.c b/hw/mips/malta.c
index b770b8d367..55037eb90f 100644
--- a/hw/mips/malta.c
+++ b/hw/mips/malta.c
@@ -97,7 +97,6 @@ struct MaltaState {
 
     Clock *cpuclk;
     MIPSCPSState cps;
-    qemu_irq i8259[ISA_NUM_IRQS];
 };
 
 static struct _loaderparams {
@@ -1391,7 +1390,8 @@ void mips_malta_init(MachineState *machine)
     stl_p(memory_region_get_ram_ptr(bios_copy) + 0x10, 0x00000420);
 
     /* Northbridge */
-    pci_bus = gt64120_register(s->i8259);
+    dev = sysbus_create_simple("gt64120", -1, NULL);
+    pci_bus = PCI_BUS(qdev_get_child_bus(dev, "pci"));
     /*
      * The whole address space decoded by the GT-64120A doesn't generate
      * exception when accessing invalid memory. Create an empty slot to
@@ -1404,9 +1404,6 @@ void mips_malta_init(MachineState *machine)
 
     /* Interrupt controller */
     qdev_connect_gpio_out_named(dev, "intr", 0, i8259_irq);
-    for (int i = 0; i < ISA_NUM_IRQS; i++) {
-        s->i8259[i] = qdev_get_gpio_in_named(dev, "isa", i);
-    }
 
     /* generate SPD EEPROM data */
     generate_eeprom_spd(&smbus_eeprom_buf[0 * 256], ram_size);
diff --git a/hw/net/ne2000-isa.c b/hw/net/ne2000-isa.c
index dd6f6e34d3..6ced6775ff 100644
--- a/hw/net/ne2000-isa.c
+++ b/hw/net/ne2000-isa.c
@@ -68,7 +68,7 @@ static void isa_ne2000_realizefn(DeviceState *dev, Error **errp)
     ne2000_setup_io(s, DEVICE(isadev), 0x20);
     isa_register_ioport(isadev, &s->io, isa->iobase);
 
-    isa_init_irq(isadev, &s->irq, isa->isairq);
+    s->irq = isa_get_irq(isadev, isa->isairq);
 
     qemu_macaddr_default_if_unset(&s->c.macaddr);
     ne2000_reset(s);
diff --git a/hw/rtc/m48t59-isa.c b/hw/rtc/m48t59-isa.c
index dc21fb10a5..e61f7ec370 100644
--- a/hw/rtc/m48t59-isa.c
+++ b/hw/rtc/m48t59-isa.c
@@ -42,6 +42,7 @@ struct M48txxISAState {
     ISADevice parent_obj;
     M48t59State state;
     uint32_t io_base;
+    uint8_t isairq;
     MemoryRegion io;
 };
 
@@ -79,6 +80,7 @@ static void m48txx_isa_toggle_lock(Nvram *obj, int lock)
 static Property m48t59_isa_properties[] = {
     DEFINE_PROP_INT32("base-year", M48txxISAState, state.base_year, 0),
     DEFINE_PROP_UINT32("iobase", M48txxISAState, io_base, 0x74),
+    DEFINE_PROP_UINT8("irq", M48txxISAState, isairq, 8),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -97,9 +99,14 @@ static void m48t59_isa_realize(DeviceState *dev, Error **errp)
     M48txxISAState *d = M48TXX_ISA(dev);
     M48t59State *s = &d->state;
 
+    if (d->isairq >= ISA_NUM_IRQS) {
+        error_setg(errp, "Maximum value for \"irq\" is: %u", ISA_NUM_IRQS - 1);
+        return;
+    }
+
     s->model = u->info.model;
     s->size = u->info.size;
-    isa_init_irq(isadev, &s->IRQ, 8);
+    s->IRQ = isa_get_irq(isadev, d->isairq);
     m48t59_realize_common(s, errp);
     memory_region_init_io(&d->io, OBJECT(dev), &m48t59_io_ops, s, "m48t59", 4);
     if (d->io_base != 0) {
diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c
index ac9a60c90e..f235c2ddbe 100644
--- a/hw/rtc/mc146818rtc.c
+++ b/hw/rtc/mc146818rtc.c
@@ -912,6 +912,11 @@ static void rtc_realizefn(DeviceState *dev, Error **errp)
         s->base_year = 0;
     }
 
+    if (s->isairq >= ISA_NUM_IRQS) {
+        error_setg(errp, "Maximum value for \"irq\" is: %u", ISA_NUM_IRQS - 1);
+        return;
+    }
+
     rtc_set_date_from_host(isadev);
 
     switch (s->lost_tick_policy) {
@@ -957,15 +962,17 @@ ISADevice *mc146818_rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
 {
     DeviceState *dev;
     ISADevice *isadev;
+    RTCState *s;
 
     isadev = isa_new(TYPE_MC146818_RTC);
     dev = DEVICE(isadev);
+    s = MC146818_RTC(isadev);
     qdev_prop_set_int32(dev, "base_year", base_year);
     isa_realize_and_unref(isadev, bus, &error_fatal);
     if (intercept_irq) {
         qdev_connect_gpio_out(dev, 0, intercept_irq);
     } else {
-        isa_connect_gpio_out(isadev, 0, RTC_ISA_IRQ);
+        isa_connect_gpio_out(isadev, 0, s->isairq);
     }
 
     object_property_add_alias(qdev_get_machine(), "rtc-time", OBJECT(isadev),
@@ -976,6 +983,7 @@ ISADevice *mc146818_rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
 
 static Property mc146818rtc_properties[] = {
     DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980),
+    DEFINE_PROP_UINT8("irq", RTCState, isairq, RTC_ISA_IRQ),
     DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState,
                                lost_tick_policy, LOST_TICK_POLICY_DISCARD),
     DEFINE_PROP_END_OF_LIST(),
@@ -1011,6 +1019,7 @@ static void rtc_reset_hold(Object *obj)
 
 static void rtc_build_aml(ISADevice *isadev, Aml *scope)
 {
+    RTCState *s = MC146818_RTC(isadev);
     Aml *dev;
     Aml *crs;
 
@@ -1021,7 +1030,7 @@ static void rtc_build_aml(ISADevice *isadev, Aml *scope)
     crs = aml_resource_template();
     aml_append(crs, aml_io(AML_DECODE16, RTC_ISA_BASE, RTC_ISA_BASE,
                            0x01, 0x08));
-    aml_append(crs, aml_irq_no_flags(RTC_ISA_IRQ));
+    aml_append(crs, aml_irq_no_flags(s->isairq));
 
     dev = aml_device("RTC");
     aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0B00")));
diff --git a/hw/tpm/tpm_tis_isa.c b/hw/tpm/tpm_tis_isa.c
index 10d8a14f19..3477afd735 100644
--- a/hw/tpm/tpm_tis_isa.c
+++ b/hw/tpm/tpm_tis_isa.c
@@ -127,7 +127,7 @@ static void tpm_tis_isa_realizefn(DeviceState *dev, Error **errp)
         return;
     }
 
-    isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num);
+    s->irq = isa_get_irq(ISA_DEVICE(dev), s->irq_num);
 
     memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)),
                                 TPM_TIS_ADDR_BASE, &s->mmio);
diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
index d4417b34b6..034d706ba1 100644
--- a/include/hw/isa/isa.h
+++ b/include/hw/isa/isa.h
@@ -83,8 +83,6 @@ struct ISADevice {
     DeviceState parent_obj;
     /*< public >*/
 
-    int8_t isairq[2];      /* -1 = unassigned */
-    int nirqs;
     int ioport_id;
 };
 
@@ -92,7 +90,6 @@ ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space,
                     MemoryRegion *address_space_io, Error **errp);
 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq);
-void isa_init_irq(ISADevice *dev, qemu_irq *p, unsigned isairq);
 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq);
 void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16);
 IsaDma *isa_get_dma(ISABus *bus, int nchan);
diff --git a/include/hw/mips/mips.h b/include/hw/mips/mips.h
index 6c9c8805f3..101799f7d3 100644
--- a/include/hw/mips/mips.h
+++ b/include/hw/mips/mips.h
@@ -9,9 +9,6 @@
 
 #include "exec/memory.h"
 
-/* gt64xxx.c */
-PCIBus *gt64120_register(qemu_irq *pic);
-
 /* bonito.c */
 PCIBus *bonito_init(qemu_irq *pic);
 
diff --git a/include/hw/rtc/mc146818rtc.h b/include/hw/rtc/mc146818rtc.h
index 5b45b22924..deef93f89a 100644
--- a/include/hw/rtc/mc146818rtc.h
+++ b/include/hw/rtc/mc146818rtc.h
@@ -25,6 +25,7 @@ struct RTCState {
     MemoryRegion coalesced_io;
     uint8_t cmos_data[128];
     uint8_t cmos_index;
+    uint8_t isairq;
     int32_t base_year;
     uint64_t base_rtc;
     uint64_t last_update;
diff --git a/include/hw/southbridge/piix.h b/include/hw/southbridge/piix.h
index 6387f2b612..f63f83e5c6 100644
--- a/include/hw/southbridge/piix.h
+++ b/include/hw/southbridge/piix.h
@@ -70,8 +70,6 @@ typedef struct PIIXState PIIX3State;
 DECLARE_INSTANCE_CHECKER(PIIX3State, PIIX3_PCI_DEVICE,
                          TYPE_PIIX3_PCI_DEVICE)
 
-extern PCIDevice *piix4_dev;
-
 PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus);
 
 DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus, I2CBus **smbus);
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 4aae23934b..af287177d5 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -434,14 +434,13 @@ static void mips_cpu_disas_set_info(CPUState *s, disassemble_info *info)
  * Since commit 6af0bf9c7c3 this model assumes a CPU clocked at 200MHz.
  */
 #define CPU_FREQ_HZ_DEFAULT     200000000
-#define CP0_COUNT_RATE_DEFAULT  2
 
 static void mips_cp0_period_set(MIPSCPU *cpu)
 {
     CPUMIPSState *env = &cpu->env;
 
     env->cp0_count_ns = clock_ticks_to_ns(MIPS_CPU(cpu)->clock,
-                                          cpu->cp0_count_rate);
+                                          env->cpu_model->CCRes);
     assert(env->cp0_count_ns);
 }
 
@@ -514,13 +513,6 @@ static ObjectClass *mips_cpu_class_by_name(const char *cpu_model)
     return oc;
 }
 
-static Property mips_cpu_properties[] = {
-    /* CP0 timer running at half the clock of the CPU */
-    DEFINE_PROP_UINT32("cp0-count-rate", MIPSCPU, cp0_count_rate,
-                       CP0_COUNT_RATE_DEFAULT),
-    DEFINE_PROP_END_OF_LIST()
-};
-
 #ifndef CONFIG_USER_ONLY
 #include "hw/core/sysemu-cpu-ops.h"
 
@@ -560,7 +552,6 @@ static void mips_cpu_class_init(ObjectClass *c, void *data)
     device_class_set_parent_realize(dc, mips_cpu_realizefn,
                                     &mcc->parent_realize);
     device_class_set_parent_reset(dc, mips_cpu_reset, &mcc->parent_reset);
-    device_class_set_props(dc, mips_cpu_properties);
 
     cc->class_by_name = mips_cpu_class_by_name;
     cc->has_work = mips_cpu_has_work;
diff --git a/target/mips/cpu.h b/target/mips/cpu.h
index 09e98f64de..52ce08a94d 100644
--- a/target/mips/cpu.h
+++ b/target/mips/cpu.h
@@ -1167,7 +1167,6 @@ typedef struct CPUArchState {
  * @env: #CPUMIPSState
  * @clock: this CPU input clock (may be connected
  *         to an output clock from another device).
- * @cp0_count_rate: rate at which the coprocessor 0 counter increments
  *
  * A MIPS CPU.
  */
@@ -1179,14 +1178,6 @@ struct ArchCPU {
     Clock *clock;
     CPUNegativeOffsetState neg;
     CPUMIPSState env;
-    /*
-     * The Count register acts as a timer, incrementing at a constant rate,
-     * whether or not an instruction is executed, retired, or any forward
-     * progress is made through the pipeline. The rate at which the counter
-     * increments is implementation dependent, and is a function of the
-     * pipeline clock of the processor, not the issue width of the processor.
-     */
-    unsigned cp0_count_rate;
 };
 
 
diff --git a/target/mips/internal.h b/target/mips/internal.h
index ac6e03e2f2..57b312689a 100644
--- a/target/mips/internal.h
+++ b/target/mips/internal.h
@@ -47,6 +47,15 @@ struct mips_def_t {
     target_ulong CP0_LLAddr_rw_bitmask;
     int CP0_LLAddr_shift;
     int32_t SYNCI_Step;
+    /*
+     * @CCRes: rate at which the coprocessor 0 counter increments
+     *
+     * The Count register acts as a timer, incrementing at a constant rate,
+     * whether or not an instruction is executed, retired, or any forward
+     * progress is made through the pipeline. The rate at which the counter
+     * increments is implementation dependent, and is a function of the
+     * pipeline clock of the processor, not the issue width of the processor.
+     */
     int32_t CCRes;
     int32_t CP0_Status_rw_bitmask;
     int32_t CP0_TCStatus_rw_bitmask;
diff --git a/tests/avocado/linux_ssh_mips_malta.py b/tests/avocado/linux_ssh_mips_malta.py
index c0f0be5ade..0179d8a6ca 100644
--- a/tests/avocado/linux_ssh_mips_malta.py
+++ b/tests/avocado/linux_ssh_mips_malta.py
@@ -23,6 +23,9 @@ from avocado.utils import ssh
 @skipUnless(os.getenv('AVOCADO_TIMEOUT_EXPECTED'), 'Test might timeout')
 @skipUnless(ssh.SSH_CLIENT_BINARY, 'No SSH client available')
 class LinuxSSH(QemuSystemTest, LinuxSSHMixIn):
+    """
+    :avocado: tags=accel:tcg
+    """
 
     timeout = 150 # Not for 'configure --enable-debug --enable-debug-tcg'
 
diff --git a/tests/qemu-iotests/172.out b/tests/qemu-iotests/172.out
index 4cf4d536b4..9479b92185 100644
--- a/tests/qemu-iotests/172.out
+++ b/tests/qemu-iotests/172.out
@@ -15,7 +15,6 @@ Testing:
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -43,7 +42,6 @@ Testing: -fda TEST_DIR/t.qcow2
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -81,7 +79,6 @@ Testing: -fdb TEST_DIR/t.qcow2
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -135,7 +132,6 @@ Testing: -fda TEST_DIR/t.qcow2 -fdb TEST_DIR/t.qcow2.2
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -190,7 +186,6 @@ Testing: -fdb
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -230,7 +225,6 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -268,7 +262,6 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2,index=1
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -322,7 +315,6 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=floppy,file=TEST_DIR/t
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -380,7 +372,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -418,7 +409,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,unit=1
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -456,7 +446,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qco
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -520,7 +509,6 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -device fl
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -575,7 +563,6 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -device fl
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -630,7 +617,6 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -device fl
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -685,7 +671,6 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -device fl
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -749,7 +734,6 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.q
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -804,7 +788,6 @@ Testing: -drive if=floppy,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.q
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -865,7 +848,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -global floppy.drive=none0 -device
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -933,7 +915,6 @@ Testing: -device floppy
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -958,7 +939,6 @@ Testing: -device floppy,drive-type=120
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -983,7 +963,6 @@ Testing: -device floppy,drive-type=144
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -1008,7 +987,6 @@ Testing: -device floppy,drive-type=288
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -1036,7 +1014,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,drive-t
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -1074,7 +1051,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,drive-t
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -1115,7 +1091,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,logical
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""
@@ -1153,7 +1128,6 @@ Testing: -drive if=none,file=TEST_DIR/t.qcow2 -device floppy,drive=none0,physica
             fdtypeA = "auto"
             fdtypeB = "auto"
             fallback = "288"
-            isa irq 6
             bus: floppy-bus.0
               type floppy-bus
               dev: floppy, id ""