[Qemu-devel] [PATCH 3/3] virtio-9p: add savem handlers

[Greg Kurz]

We don't support migration of mounted 9p shares. This is handled by a
migration blocker.

One would expect, however, to be able to migrate if the share is unmounted.
Unfortunately virtio-9p-device does not register savevm handlers at all !
Migration succeeds and leaves the guest with a dangling device...

This patch simply registers migration handlers for virtio-9p-device. Whether
migration is possible or not still depends on the migration blocker.

Signed-off-by: Greg Kurz <address@hidden>
---
 hw/9pfs/virtio-9p-device.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index ed133c40493a..bd7f10a0a902 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t 
*config)
     g_free(cfg);
 }
 
+static void virtio_9p_save(QEMUFile *f, void *opaque)
+{
+    virtio_save(VIRTIO_DEVICE(opaque), f);
+}
+
+static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
+{
+    return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
+}
+
 static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
@@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, 
Error **errp)
     }
     v9fs_path_free(&path);
 
+    register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, 
s);
     return;
 out:
     g_free(s->ctx.fs_root);
@@ -146,6 +157,7 @@ static void virtio_9p_device_unrealize(DeviceState *dev, 
Error **errp)
     v9fs_release_worker_threads();
     g_free(s->ctx.fs_root);
     g_free(s->tag);
+    unregister_savevm(dev, "virtio-9p", s);
     virtio_cleanup(vdev);
 }