virtio: introduce device specific migration calls

In order to migrate virtio subsections, they should be streamed after the device itself. We need the device specific code to be called from the common migration code to achieve this. This patch introduces load and save methods for this purpose. Suggested-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
qemu · Jun 29, 2014 · 1b5fc0d · 1b5fc0d
1 parent e38e943
commit 1b5fc0d
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Showing 8 changed files with 21 additions and 8 deletions.
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
@@ -635,7 +635,7 @@ static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
     if (version_id != 2)
         return -EINVAL;
 
-    ret = virtio_load(vdev, f);
+    ret = virtio_load(vdev, f, version_id);
     if (ret) {
         return ret;
     }

diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
@@ -670,7 +670,7 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
     }
 
     /* The virtio device */
-    ret = virtio_load(VIRTIO_DEVICE(s), f);
+    ret = virtio_load(VIRTIO_DEVICE(s), f, version_id);
     if (ret) {
         return ret;
     }

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
@@ -1362,7 +1362,7 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
     if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
         return -EINVAL;
 
-    ret = virtio_load(vdev, f);
+    ret = virtio_load(vdev, f, version_id);
     if (ret) {
         return ret;
     }

diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
@@ -549,7 +549,7 @@ static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
     VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
     int ret;
 
-    ret = virtio_load(vdev, f);
+    ret = virtio_load(vdev, f, version_id);
     if (ret) {
         return ret;
     }

diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
@@ -343,7 +343,7 @@ static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
     if (version_id != 1)
         return -EINVAL;
 
-    ret = virtio_load(vdev, f);
+    ret = virtio_load(vdev, f, version_id);
     if (ret) {
         return ret;
     }

diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c
@@ -113,7 +113,7 @@ static int virtio_rng_load(QEMUFile *f, void *opaque, int version_id)
     if (version_id != 1) {
         return -EINVAL;
     }
-    virtio_load(vdev, f);
+    virtio_load(vdev, f, version_id);
 
     /* We may have an element ready but couldn't process it due to a quota
      * limit.  Make sure to try again after live migration when the quota may

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
@@ -843,6 +843,7 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
 {
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
     int i;
 
     if (k->save_config) {
@@ -877,6 +878,10 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
             k->save_queue(qbus->parent, i, f);
         }
     }
+
+    if (vdc->save != NULL) {
+        vdc->save(vdev, f);
+    }
 }
 
 int virtio_set_features(VirtIODevice *vdev, uint32_t val)
@@ -895,7 +900,7 @@ int virtio_set_features(VirtIODevice *vdev, uint32_t val)
     return bad ? -1 : 0;
 }
 
-int virtio_load(VirtIODevice *vdev, QEMUFile *f)
+int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
 {
     int i, ret;
     int32_t config_len;
@@ -904,6 +909,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
     uint32_t supported_features;
     BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
 
     if (k->load_config) {
         ret = k->load_config(qbus->parent, f);
@@ -983,6 +989,11 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
     }
 
     virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
+
+    if (vdc->load != NULL) {
+        return vdc->load(vdev, f, version_id);
+    }
+
     return 0;
 }
 

diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
@@ -150,6 +150,8 @@ typedef struct VirtioDeviceClass {
      * must mask in frontend instead.
      */
     void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
+    void (*save)(VirtIODevice *vdev, QEMUFile *f);
+    int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
 } VirtioDeviceClass;
 
 void virtio_init(VirtIODevice *vdev, const char *name,
@@ -184,7 +186,7 @@ void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 
 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
 
-int virtio_load(VirtIODevice *vdev, QEMUFile *f);
+int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
 
 void virtio_notify_config(VirtIODevice *vdev);