To allow reusing ISA bridge emulation for vt8231_isa move the device
state of vt82c686b_isa emulation in an abstract via_isa class. This
change breaks migration back compatibility but this is not an issue
for Fuloong2E machine which is not versioned or migration supported.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 hw/isa/vt82c686.c        | 70 ++++++++++++++++++++++------------------
 include/hw/pci/pci_ids.h |  2 +-
 2 files changed, 40 insertions(+), 32 deletions(-)

diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c
index 72234bc4d1..5137f97f37 100644
--- a/hw/isa/vt82c686.c
+++ b/hw/isa/vt82c686.c
@@ -609,24 +609,48 @@ static const TypeInfo vt8231_superio_info = {
 };
 
 
-OBJECT_DECLARE_SIMPLE_TYPE(VT82C686BISAState, VT82C686B_ISA)
+#define TYPE_VIA_ISA "via-isa"
+OBJECT_DECLARE_SIMPLE_TYPE(ViaISAState, VIA_ISA)
 
-struct VT82C686BISAState {
+struct ViaISAState {
     PCIDevice dev;
     qemu_irq cpu_intr;
     ViaSuperIOState *via_sio;
 };
 
+static const VMStateDescription vmstate_via = {
+    .name = "via-isa",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(dev, ViaISAState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static const TypeInfo via_isa_info = {
+    .name          = TYPE_VIA_ISA,
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(ViaISAState),
+    .abstract      = true,
+    .interfaces    = (InterfaceInfo[]) {
+        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { },
+    },
+};
+
 static void via_isa_request_i8259_irq(void *opaque, int irq, int level)
 {
-    VT82C686BISAState *s = opaque;
+    ViaISAState *s = opaque;
     qemu_set_irq(s->cpu_intr, level);
 }
 
+/* TYPE_VT82C686B_ISA */
+
 static void vt82c686b_write_config(PCIDevice *d, uint32_t addr,
                                    uint32_t val, int len)
 {
-    VT82C686BISAState *s = VT82C686B_ISA(d);
+    ViaISAState *s = VIA_ISA(d);
 
     trace_via_isa_write(addr, val, len);
     pci_default_write_config(d, addr, val, len);
@@ -636,19 +660,9 @@ static void vt82c686b_write_config(PCIDevice *d, uint32_t addr,
     }
 }
 
-static const VMStateDescription vmstate_via = {
-    .name = "vt82c686b",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(dev, VT82C686BISAState),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
 static void vt82c686b_isa_reset(DeviceState *dev)
 {
-    VT82C686BISAState *s = VT82C686B_ISA(dev);
+    ViaISAState *s = VIA_ISA(dev);
     uint8_t *pci_conf = s->dev.config;
 
     pci_set_long(pci_conf + PCI_CAPABILITY_LIST, 0x000000c0);
@@ -668,7 +682,7 @@ static void vt82c686b_isa_reset(DeviceState *dev)
 
 static void vt82c686b_realize(PCIDevice *d, Error **errp)
 {
-    VT82C686BISAState *s = VT82C686B_ISA(d);
+    ViaISAState *s = VIA_ISA(d);
     DeviceState *dev = DEVICE(d);
     ISABus *isa_bus;
     qemu_irq *isa_irq;
@@ -692,7 +706,7 @@ static void vt82c686b_realize(PCIDevice *d, Error **errp)
     }
 }
 
-static void via_class_init(ObjectClass *klass, void *data)
+static void vt82c686b_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
@@ -700,28 +714,21 @@ static void via_class_init(ObjectClass *klass, void *data)
     k->realize = vt82c686b_realize;
     k->config_write = vt82c686b_write_config;
     k->vendor_id = PCI_VENDOR_ID_VIA;
-    k->device_id = PCI_DEVICE_ID_VIA_ISA_BRIDGE;
+    k->device_id = PCI_DEVICE_ID_VIA_82C686B_ISA;
     k->class_id = PCI_CLASS_BRIDGE_ISA;
     k->revision = 0x40;
     dc->reset = vt82c686b_isa_reset;
     dc->desc = "ISA bridge";
     dc->vmsd = &vmstate_via;
-    /*
-     * Reason: part of VIA VT82C686 southbridge, needs to be wired up,
-     * e.g. by mips_fuloong2e_init()
-     */
+    /* Reason: part of VIA VT82C686 southbridge, needs to be wired up */
     dc->user_creatable = false;
 }
 
-static const TypeInfo via_info = {
+static const TypeInfo vt82c686b_isa_info = {
     .name          = TYPE_VT82C686B_ISA,
-    .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VT82C686BISAState),
-    .class_init    = via_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
-        { },
-    },
+    .parent        = TYPE_VIA_ISA,
+    .instance_size = sizeof(ViaISAState),
+    .class_init    = vt82c686b_class_init,
 };
 
 
@@ -733,7 +740,8 @@ static void vt82c686b_register_types(void)
     type_register_static(&via_superio_info);
     type_register_static(&vt82c686b_superio_info);
     type_register_static(&vt8231_superio_info);
-    type_register_static(&via_info);
+    type_register_static(&via_isa_info);
+    type_register_static(&vt82c686b_isa_info);
 }
 
 type_init(vt82c686b_register_types)
diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h
index ea28dcc850..aa3f67eaa4 100644
--- a/include/hw/pci/pci_ids.h
+++ b/include/hw/pci/pci_ids.h
@@ -204,7 +204,7 @@
 #define PCI_VENDOR_ID_XILINX             0x10ee
 
 #define PCI_VENDOR_ID_VIA                0x1106
-#define PCI_DEVICE_ID_VIA_ISA_BRIDGE     0x0686
+#define PCI_DEVICE_ID_VIA_82C686B_ISA    0x0686
 #define PCI_DEVICE_ID_VIA_IDE            0x0571
 #define PCI_DEVICE_ID_VIA_UHCI           0x3038
 #define PCI_DEVICE_ID_VIA_82C686B_PM     0x3057
-- 
2.21.3

On 3/9/21 9:28 PM, BALATON Zoltan wrote:
> To allow reusing ISA bridge emulation for vt8231_isa move the device
> state of vt82c686b_isa emulation in an abstract via_isa class. This
> change breaks migration back compatibility but this is not an issue
> for Fuloong2E machine which is not versioned or migration supported.
> 
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> ---
>  hw/isa/vt82c686.c        | 70 ++++++++++++++++++++++------------------
>  include/hw/pci/pci_ids.h |  2 +-
>  2 files changed, 40 insertions(+), 32 deletions(-)

This should be OK if this other series is accepted:
"hw/usb: Extract Extract VT82C686 UHCI PCI function into new unit"
https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg03083.html

I'll come back to this patch after the former series is reviewed.

On Wed, 10 Mar 2021, Philippe Mathieu-Daudé wrote:
> On 3/9/21 9:28 PM, BALATON Zoltan wrote:
>> To allow reusing ISA bridge emulation for vt8231_isa move the device
>> state of vt82c686b_isa emulation in an abstract via_isa class. This
>> change breaks migration back compatibility but this is not an issue
>> for Fuloong2E machine which is not versioned or migration supported.
>>
>> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
>> ---
>>  hw/isa/vt82c686.c        | 70 ++++++++++++++++++++++------------------
>>  include/hw/pci/pci_ids.h |  2 +-
>>  2 files changed, 40 insertions(+), 32 deletions(-)
>
> This should be OK if this other series is accepted:
> "hw/usb: Extract Extract VT82C686 UHCI PCI function into new unit"
> https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg03083.html

How is this patch related to that series? This one changes the isa bridge 
part and that makes the usb part compiled only if configured. These seem 
unrelated and independent to me.

Regards,
BALATON Zoltan

> I'll come back to this patch after the former series is reviewed.
>
>