ppc440: Stop using system io region for PCIe buses

Add separate memory regions for the mem and io spaces of the PCIe bus
to avoid different buses using the same system io region.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <b631c3a61729eee2166d899b8888164ebeb71574.1688586835.git.balaton@eik.bme.hu>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

hw/ppc/ppc440_uc.c

@@ -776,6 +776,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(PPC460EXPCIEState, PPC460EX_PCIE_HOST)
 struct PPC460EXPCIEState {
     PCIExpressHost parent_obj;
 
+    MemoryRegion busmem;
     MemoryRegion iomem;
     qemu_irq irq[4];
     int32_t dcrn_base;
@@ -1056,15 +1057,17 @@ static void ppc460ex_pcie_realize(DeviceState *dev, Error **errp)
         error_setg(errp, "invalid PCIe DCRN base");
         return;
     }
+    snprintf(buf, sizeof(buf), "pcie%d-mem", id);
+    memory_region_init(&s->busmem, OBJECT(s), buf, UINT64_MAX);
     snprintf(buf, sizeof(buf), "pcie%d-io", id);
-    memory_region_init(&s->iomem, OBJECT(s), buf, UINT64_MAX);
+    memory_region_init(&s->iomem, OBJECT(s), buf, 64 * KiB);
     for (i = 0; i < 4; i++) {
         sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[i]);
     }
     snprintf(buf, sizeof(buf), "pcie.%d", id);
     pci->bus = pci_register_root_bus(DEVICE(s), buf, ppc460ex_set_irq,
-                                pci_swizzle_map_irq_fn, s, &s->iomem,
-                                get_system_io(), 0, 4, TYPE_PCIE_BUS);
+                                pci_swizzle_map_irq_fn, s, &s->busmem,
+                                &s->iomem, 0, 4, TYPE_PCIE_BUS);
     ppc460ex_pcie_register_dcrs(s);
 }