[Qemu-devel] [PATCH 01/12] virtio: add VIRTIO_DEF_DEVICE_VMSD macro

[Halil Pasic <pasic@linux.vnet.ibm.com>]

In most cases the functions passed to VMSTATE_VIRTIO_DEVICE
only call the virtio_load and virtio_save wrappers. Some include some
pre- and post- massaging too. The massaging is better expressed
as such in the VMStateDescription.

Let us introduce a new macro called VIRTIO_DEF_DEVICE_VMSD and replace
VMSTATE_VIRTIO_DEVICE with it gradually.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
---
 hw/virtio/virtio.c         | 15 +++++++++++++++
 include/hw/virtio/virtio.h | 25 +++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 18ce333..ca0a780 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1622,6 +1622,21 @@ void virtio_vmstate_save(QEMUFile *f, void *opaque, size_t size)
     virtio_save(VIRTIO_DEVICE(opaque), f);
 }
 
+/* A wrapper for use as a VMState .put function */
+void virtio_save_as_vmsi_put(QEMUFile *f, void *opaque, size_t size)
+{
+    virtio_save(VIRTIO_DEVICE(opaque), f);
+}
+
+/* A wrapper for use as a VMState .get function */
+int virtio_load_as_vmsi_get(QEMUFile *f, void *opaque, size_t size)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
+    DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev));
+
+    return virtio_load(vdev, f, dc->vmsd->version_id);
+}
+
 static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val)
 {
     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 888c8de..01de49b 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -176,6 +176,31 @@ 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);
+void virtio_save_as_vmsi_put(QEMUFile *f, void *opaque, size_t size);
+int virtio_load_as_vmsi_get(QEMUFile *f, void *opaque, size_t size);
+
+#define VMSTATE_VIRTIO_FIELD \
+    {                                         \
+        .name = "virtio",                     \
+        .info = &(const VMStateInfo) {        \
+            .name = "virtio",                 \
+            .get = virtio_load_as_vmsi_get,   \
+            .put = virtio_save_as_vmsi_put,   \
+        },                                    \
+        .flags = VMS_SINGLE,                  \
+    }
+
+#define VIRTIO_DEF_DEVICE_VMSD(devname, v, ...) \
+    static const VMStateDescription vmstate_virtio_ ## devname = { \
+        .name = "virtio-" #devname ,          \
+        .minimum_version_id = v,              \
+        .version_id = v,                      \
+        .fields = (VMStateField[]) {          \
+            VMSTATE_VIRTIO_FIELD,             \
+            VMSTATE_END_OF_LIST()             \
+        },                                    \
+        __VA_ARGS__                           \
+    };
 
 #define VMSTATE_VIRTIO_DEVICE(devname, v, getf, putf) \
     static const VMStateDescription vmstate_virtio_ ## devname = { \
-- 
2.8.4