[PATCH] hw/misc/edu: support pci device state migration

[Zeng Guang]

Currently edu device doesn't support live migration. Part of PCI
configuration information would be lost after migration.

PCI device state in source VM:
     Bus  0, device   3, function 0:
     Class 0255: PCI device 1234:11e8
     PCI subsystem 1af4:1100
     IRQ 11, pin A
     BAR0: 32 bit memory at 0xfea00000 [0xfeafffff].
     id ""

PCI device state in destination VM:
     Bus  0, device   3, function 0:
     Class 0255: PCI device 1234:11e8
     PCI subsystem 1af4:1100
     IRQ 0, pin A
     BAR0: 32 bit memory at 0xffffffffffffffff [0x000ffffe].
     id ""

Add VMState for edu device to support migration.

Signed-off-by: Gao Chao <chao.gao@intel.com>
Signed-off-by: Zeng Guang <guang.zeng@intel.com>
Reviewed-by: Wei Wang <wei.w.wang@intel.com>
---
 hw/misc/edu.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/misc/edu.c b/hw/misc/edu.c
index ec617e63f3..3ff2759ee1 100644
--- a/hw/misc/edu.c
+++ b/hw/misc/edu.c
@@ -27,6 +27,7 @@
 #include "hw/pci/pci.h"
 #include "hw/hw.h"
 #include "hw/pci/msi.h"
+#include "migration/vmstate.h"
 #include "qemu/timer.h"
 #include "qemu/main-loop.h" /* iothread mutex */
 #include "qemu/module.h"
@@ -405,6 +406,16 @@ static void edu_instance_init(Object *obj)
                                    &edu->dma_mask, OBJ_PROP_FLAG_READWRITE);
 }
 
+static const VMStateDescription vmstate_edu = {
+    .name = "edu",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(pdev, EduState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static void edu_class_init(ObjectClass *class, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(class);
@@ -415,6 +426,7 @@ static void edu_class_init(ObjectClass *class, void *data)
     k->vendor_id = PCI_VENDOR_ID_QEMU;
     k->device_id = 0x11e8;
     k->revision = 0x10;
+    dc->vmsd = &vmstate_edu;
     k->class_id = PCI_CLASS_OTHERS;
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
-- 
2.17.1