Re: [Xen-devel] [v2][PATCH 2/5] hw:pci-host:piix: split i440fx_init

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

On 2014/7/31 17:10, Michael S. Tsirkin wrote:
> On Thu, Jul 31, 2014 at 02:31:36PM +0800, Tiejun Chen wrote:
> > We'd like to split i440fx_init and then we can share something
> > with other stuff.
> >
> > Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> I think this is too much work for very little benefit.
> Just pass const char *type to i440fx_init.
You know we will introduce that faked PCIe device represented that PCH 
later, so how to distinguish them? Are you saying I should check the 
type like this?
if(Xen-Type)
{}
else
{}

If so, actually this is mostly same as my original implementation,

"
@@ -333,8 +348,15 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
    object_property_add_child(qdev_get_machine(), "i440fx", 
OBJECT(dev), NULL);
    qdev_init_nofail(dev);

-    d = pci_create_simple(b, 0, TYPE_I440FX_PCI_DEVICE);
-    *pi440fx_state = I440FX_PCI_DEVICE(d);
+    if (xen_enabled() && xen_has_gfx_passthru) {
+        d = pci_create_simple(b, 0, TYPE_I440FX_XEN_PCI_DEVICE);
+        *pi440fx_state = I440FX_XEN_PCI_DEVICE(d);
+        pci_create_pch(b);
+    } else {
+        d = pci_create_simple(b, 0, TYPE_I440FX_PCI_DEVICE);
+        *pi440fx_state = I440FX_PCI_DEVICE(d);
+    }
+
    f = *pi440fx_state;
    f->system_memory = address_space_mem;
    f->pci_address_space = pci_address_space;
"

But as I said to you last time, Paolo doesn't like we walk the common 
codes :)
Tiejun

> -->
>
> i440fx: make type configurable at run-time
>
> Xen wants to supply a different pci host device,
> inheriting i440fx. Make this configurable.
>
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
>
> --
>
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index be8fdfe..72e612b 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -230,7 +230,8 @@ extern int no_hpet;
>   struct PCII440FXState;
>   typedef struct PCII440FXState PCII440FXState;
>
> -PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn,
> +PCIBus *i440fx_init(const char *type,
> +                    PCII440FXState **pi440fx_state, int *piix_devfn,
>                       ISABus **isa_bus, qemu_irq *pic,
>                       MemoryRegion *address_space_mem,
>                       MemoryRegion *address_space_io,
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index 31125b7..5fefde6 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -194,7 +194,8 @@ static void pc_init1(MachineState *machine,
>       }
>
>       if (pci_enabled) {
> -        pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
> +        pci_bus = i440fx_init(TYPE_I440FX_PCI_HOST_BRIDGE,
> +                              &i440fx_state, &piix3_devfn, &isa_bus, gsi,
>                                 system_memory, system_io, machine->ram_size,
>                                 below_4g_mem_size,
>                                 above_4g_mem_size,
> diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> index e0e0946..f0c5b5d 100644
> --- a/hw/pci-host/piix.c
> +++ b/hw/pci-host/piix.c
> @@ -305,7 +305,8 @@ static int i440fx_initfn(PCIDevice *dev)
>       return 0;
>   }
>
> -PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
> +PCIBus *i440fx_init(const char *type,
> +                    PCII440FXState **pi440fx_state,
>                       int *piix3_devfn,
>                       ISABus **isa_bus, qemu_irq *pic,
>                       MemoryRegion *address_space_mem,
> @@ -325,7 +326,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
>       unsigned i;
>       I440FXState *i440fx;
>
> -    dev = qdev_create(NULL, TYPE_I440FX_PCI_HOST_BRIDGE);
> +    dev = qdev_create(NULL, type);
>       s = PCI_HOST_BRIDGE(dev);
>       b = pci_bus_new(dev, NULL, pci_address_space,
>                       address_space_io, 0, TYPE_PCI_BUS);
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