Patchwork [05/10] convert PORT92 as piix3 proper QOM child

diff --git a/hw/pc.c b/hw/pc.c
index 80b437f..94fdea9 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -421,14 +421,6 @@  static void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
     qemu_register_reset(pc_cmos_init_late, &arg);
 }
 
-/* port 92 stuff: could be split off */
-typedef struct Port92State {
-    ISADevice dev;
-    MemoryRegion io;
-    uint8_t outport;
-    qemu_irq *a20_out;
-} Port92State;
-
 static void port92_write(void *opaque, hwaddr addr, uint64_t val,
                          unsigned size)
 {
@@ -453,13 +445,6 @@  static uint64_t port92_read(void *opaque, hwaddr addr,
     return ret;
 }
 
-static void port92_init(ISADevice *dev, qemu_irq *a20_out)
-{
-    Port92State *s = DO_UPCAST(Port92State, dev, dev);
-
-    s->a20_out = a20_out;
-}
-
 static const VMStateDescription vmstate_port92_isa = {
     .name = "port92",
     .version_id = 1,
@@ -510,7 +495,7 @@  static void port92_class_initfn(ObjectClass *klass, void *data)
 }
 
 static TypeInfo port92_info = {
-    .name          = "port92",
+    .name          = TYPE_PORT92,
     .parent        = TYPE_ISA_DEVICE,
     .instance_size = sizeof(Port92State),
     .class_init    = port92_class_initfn,
@@ -523,7 +508,7 @@  static void port92_register_types(void)
 
 type_init(port92_register_types)
 
-static void handle_a20_line_change(void *opaque, int irq, int level)
+void handle_a20_line_change(void *opaque, int irq, int level)
 {
     CPUX86State *cpu = opaque;
 
@@ -947,7 +932,7 @@  static void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
     int i;
     DriveInfo *fd[MAX_FD];
     qemu_irq *a20_line;
-    ISADevice *i8042, *port92, *vmmouse;
+    ISADevice *i8042, *vmmouse;
     qemu_irq *cpu_exit_irq;
 
     register_ioport_write(0x80, 1, 1, ioport80_write, NULL);
@@ -966,7 +951,7 @@  static void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
         }
     }
 
-    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 2);
+    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 1);
     i8042 = isa_create_simple(isa_bus, "i8042");
     i8042_setup_a20_line(i8042, &a20_line[0]);
     if (!no_vmport) {
@@ -979,8 +964,6 @@  static void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
         qdev_prop_set_ptr(&vmmouse->qdev, "ps2_mouse", i8042);
         qdev_init_nofail(&vmmouse->qdev);
     }
-    port92 = isa_create_simple(isa_bus, "port92");
-    port92_init(port92, &a20_line[1]);
 
     cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
     DMA_init(0, cpu_exit_irq);
diff --git a/hw/pc.h b/hw/pc.h
index d4b149e..17d48a0 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -9,6 +9,7 @@ 
 #include "net.h"
 #include "memory.h"
 #include "ioapic.h"
+#include "piix3.h"
 #include "i440fx.h"
 
 /* PC-style peripherals (also used by other machines).  */
@@ -144,4 +145,6 @@  void pc_system_firmware_init(MemoryRegion *rom_memory);
 
 int e820_add_entry(uint64_t, uint64_t, uint32_t);
 
+void handle_a20_line_change(void *opaque, int irq, int level);
+
 #endif
diff --git a/hw/piix3.c b/hw/piix3.c
index 35a0de9..675212e 100644
--- a/hw/piix3.c
+++ b/hw/piix3.c
@@ -196,6 +196,7 @@  static int piix3_realize(PCIDevice *dev)
     qemu_irq rtc_irq;
     int pit_isa_irq = 0;
     qemu_irq pit_alt_irq = NULL;
+    qemu_irq *a20_line;
 
     /* Initialize ISA Bus */
     s->bus = isa_bus_new(DEVICE(dev), pci_address_space_io(dev));
@@ -256,6 +257,12 @@  static int piix3_realize(PCIDevice *dev)
     qdev_prop_set_ptr(DEVICE(&s->pcspk), "pit", ISA_DEVICE(&s->pit));
     qdev_init_nofail(DEVICE(&s->pcspk));
 
+    /* Realize the PORT92 */
+    qdev_set_parent_bus(DEVICE(&s->port92), BUS(s->bus));
+    qdev_init_nofail(DEVICE(&s->port92));
+    a20_line = qemu_allocate_irqs(handle_a20_line_change, first_cpu, 1);
+    s->port92.a20_out = &a20_line[0];
+
     return 0;
 }
 
@@ -288,6 +295,9 @@  static void piix3_initfn(Object *obj)
 
     object_initialize(&s->pcspk, TYPE_PCSPK);
     object_property_add_child(obj, "pcspk", OBJECT(&s->pcspk), NULL);
+
+    object_initialize(&s->port92, TYPE_PORT92);
+    object_property_add_child(obj, "port92", OBJECT(&s->port92), NULL);
 }
 
 static void piix3_class_init(ObjectClass *klass, void *data)
diff --git a/hw/piix3.h b/hw/piix3.h
index 32f7a95..4e5ee20 100644
--- a/hw/piix3.h
+++ b/hw/piix3.h
@@ -51,6 +51,16 @@  typedef struct KVMPITState {
      int64_t kernel_clock_offset;
 } KVMPITState;
 
+#define TYPE_PORT92 "port92"
+
+/* port 92 stuff: could be split off */
+typedef struct Port92State {
+    ISADevice dev;
+    MemoryRegion io;
+    uint8_t outport;
+    qemu_irq *a20_out;
+} Port92State;
+
 typedef struct PIIX3State {
     PCIDevice dev;
 
@@ -79,6 +89,7 @@  typedef struct PIIX3State {
     } pit;
 #endif
     PCSpkState pcspk;
+    Port92State port92;
 
     qemu_irq *pic;