Re: [Qemu-devel] [PULL v3 for-2.4 08/11] virtio-ccw: migrate ->revision

[Christian Borntraeger <borntraeger@de.ibm.com>]

Am 02.07.2015 um 16:10 schrieb Cornelia Huck:
> We need to migrate the revision field as well. No compatibility
> concerns as we already introduced migration of ->config_vector in
> this release.
> 
> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
> ---
>  hw/s390x/virtio-ccw.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index 8597ac4..d631337 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -1472,6 +1472,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
>      qemu_put_be16(f, vdev->config_vector);
>      qemu_put_be64(f, dev->routes.adapter.ind_offset);
>      qemu_put_byte(f, dev->thinint_isc);
> +    qemu_put_be32(f, dev->revision);
>  }
> 
>  static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> @@ -1512,6 +1513,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
>                                         dev->thinint_isc, true, false,
>                                         &dev->routes.adapter.adapter_id);
>      }
> +    dev->revision = qemu_get_be32(f);
> 
>      return 0;
>  }
> 

This broke migration:

2015-07-07T11:22:55.570968Z qemu-system-s390x: VQ 39 address 0x0 inconsistent with Host index 0x100
2015-07-07T11:22:55.571008Z qemu-system-s390x: error while loading state for instance 0x0 of 

Seems that revision is used before it is loaded, something like

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index d631337..f524140 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1448,6 +1448,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
     VirtIODevice *vdev = virtio_ccw_get_vdev(s);
 
     subch_device_save(s, f);
+    qemu_put_be32(f, dev->revision);
     if (dev->indicators != NULL) {
         qemu_put_be32(f, dev->indicators->len);
         qemu_put_be64(f, dev->indicators->addr);
@@ -1472,7 +1473,6 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
     qemu_put_be16(f, vdev->config_vector);
     qemu_put_be64(f, dev->routes.adapter.ind_offset);
     qemu_put_byte(f, dev->thinint_isc);
-    qemu_put_be32(f, dev->revision);
 }
 
 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
@@ -1484,6 +1484,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
 
     s->driver_data = dev;
     subch_device_load(s, f);
+    dev->revision = qemu_get_be32(f);
     len = qemu_get_be32(f);
     if (len != 0) {
         dev->indicators = get_indicator(qemu_get_be64(f), len);
@@ -1513,7 +1514,6 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
                                        dev->thinint_isc, true, false,
                                        &dev->routes.adapter.adapter_id);
     }
-    dev->revision = qemu_get_be32(f);
 
     return 0;
 }

Seems to do the trick.