[PULL,44/55] virtio: Migration helper function and macro

Commit Message

Michael S. Tsirkin July 18, 2016, 10:47 p.m. UTC

From: "Dr. David Alan Gilbert" <[e-mail]>

To make conversion of virtio devices to VMState simple
at first add a helper function for the simple virtio_save
case and a helper macro that defines the VMState structure.
These will probably go away or change as more of the virtio
code gets converted.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Reviewed-by: Cornelia Huck <[e-mail]>
Reviewed-by: Michael S. Tsirkin <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>
---
 include/hw/virtio/virtio.h | 20 ++++++++++++++++++++
 hw/virtio/virtio.c         |  6 ++++++
 2 files changed, 26 insertions(+)

Patch

diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 7a82f79..d2490c1 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -171,6 +171,26 @@  bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq);
 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 
 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
+void virtio_vmstate_save(QEMUFile *f, void *opaque, size_t size);
+
+#define VMSTATE_VIRTIO_DEVICE(devname, v, getf, putf) \
+    static const VMStateDescription vmstate_virtio_ ## devname = { \
+        .name = "virtio-" #devname ,          \
+        .minimum_version_id = v,              \
+        .version_id = v,                      \
+        .fields = (VMStateField[]) {          \
+            {                                 \
+                .name = "virtio",             \
+                .info = &(const VMStateInfo) {\
+                        .name = "virtio",     \
+                        .get = getf,          \
+                        .put = putf,          \
+                    },                        \
+                .flags = VMS_SINGLE,          \
+            },                                \
+            VMSTATE_END_OF_LIST()             \
+        }                                     \
+    }
 
 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
 
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 2fbed0c..752b271 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1464,6 +1464,12 @@  void virtio_save(VirtIODevice *vdev, QEMUFile *f)
     vmstate_save_state(f, &vmstate_virtio, vdev, NULL);
 }
 
+/* A wrapper for use as a VMState .put function */
+void virtio_vmstate_save(QEMUFile *f, void *opaque, size_t size)
+{
+    virtio_save(VIRTIO_DEVICE(opaque), f);
+}
+
 static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val)
 {
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);