hw/pci-host/i440fx: Remove the last PIIX3 traces

The PIIX3 is not tied to the i440FX and can even be used without it.
Move its creation to the machine code (pc_piix.c).
We have now removed the last trace of southbridge code in the i440FX
northbridge.

Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>

hw/i386/pc_piix.c

@@ -192,14 +192,20 @@ static void pc_init1(MachineState *machine,
     gsi_state = pc_gsi_create(&x86ms->gsi, pcmc->pci_enabled);
 
     if (pcmc->pci_enabled) {
+        PIIX3State *piix3;
+
         pci_bus = i440fx_init(host_type,
                               pci_type,
-                              &i440fx_state, &piix3_devfn, &isa_bus, x86ms->gsi,
+                              &i440fx_state,
                               system_memory, system_io, machine->ram_size,
                               x86ms->below_4g_mem_size,
                               x86ms->above_4g_mem_size,
                               pci_memory, ram_memory);
         pcms->bus = pci_bus;
+
+        piix3 = piix3_create(pci_bus, &isa_bus);
+        piix3->pic = x86ms->gsi;
+        piix3_devfn = piix3->dev.devfn;
     } else {
         pci_bus = NULL;
         i440fx_state = NULL;

hw/pci-host/i440fx.c

@@ -27,7 +27,6 @@
 #include "hw/pci/pci.h"
 #include "hw/pci/pci_host.h"
 #include "hw/pci-host/i440fx.h"
-#include "hw/southbridge/piix.h"
 #include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
 #include "qapi/error.h"
@@ -272,8 +271,6 @@ static void i440fx_realize(PCIDevice *dev, Error **errp)
 
 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
                     PCII440FXState **pi440fx_state,
-                    int *piix3_devfn,
-                    ISABus **isa_bus, qemu_irq *pic,
                     MemoryRegion *address_space_mem,
                     MemoryRegion *address_space_io,
                     ram_addr_t ram_size,
@@ -286,7 +283,6 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
     PCIBus *b;
     PCIDevice *d;
     PCIHostState *s;
-    PIIX3State *piix3;
     PCII440FXState *f;
     unsigned i;
     I440FXState *i440fx;
@@ -339,10 +335,6 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
                  PAM_EXPAN_SIZE);
     }
 
-    piix3 = piix3_create(b, isa_bus);
-    piix3->pic = pic;
-    *piix3_devfn = piix3->dev.devfn;
-
     ram_size = ram_size / 8 / 1024 / 1024;
     if (ram_size > 255) {
         ram_size = 255;

include/hw/pci-host/i440fx.h

@@ -22,8 +22,7 @@ typedef struct PCII440FXState PCII440FXState;
 #define TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "igd-passthrough-i440FX"
 
 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
-                    PCII440FXState **pi440fx_state, int *piix_devfn,
-                    ISABus **isa_bus, qemu_irq *pic,
+                    PCII440FXState **pi440fx_state,
                     MemoryRegion *address_space_mem,
                     MemoryRegion *address_space_io,
                     ram_addr_t ram_size,