Re: [Qemu-devel] [PATCH] vhost_net: cleanup recovery

[Andrey Korolyov <andrey@xdel.ru>]

On Wed, Sep 3, 2014 at 1:20 PM, Jason Wang <jasowang@redhat.com> wrote:
> On 09/03/2014 05:10 PM, Michael S. Tsirkin wrote:
>> commit aad4dce934649b3a398396fc2a76f215bb194ea4
>>     vhost_net: start/stop guest notifiers properly
>>
>> changed the order of calls for guest notifiers,
>> but did not recover in the correct (reverse) order.
>> Fix it up.
>>
>> Cc: qemu-stable@nongnu.org
>> Cc: Andrey Korolyov <andrey@xdel.ru>
>> Cc: Jason Wang <jasowang@redhat.com>
>> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
>> ---
>>  hw/net/vhost_net.c | 12 +++++++++---
>>  1 file changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
>> index ba5d544..1fe18c7 100644
>> --- a/hw/net/vhost_net.c
>> +++ b/hw/net/vhost_net.c
>> @@ -289,7 +289,7 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
>>      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
>>      VirtioBusState *vbus = VIRTIO_BUS(qbus);
>>      VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
>> -    int r, i = 0;
>> +    int r, i;
>>
>>      if (!vhost_net_device_endian_ok(dev)) {
>>          error_report("vhost-net does not support cross-endian");
>> @@ -317,16 +317,22 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
>>          r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
>>
>>          if (r < 0) {
>> -            goto err;
>> +            goto err_start;
>>          }
>>      }
>>
>>      return 0;
>>
>> -err:
>> +err_start:
>>      while (--i >= 0) {
>>          vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
>>      }
>> +err:
>> +    r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
>> +    if (r < 0) {
>> +        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
>> +        fflush(stderr);
>> +    }
>
> We probably need a new label, since we only want to do this when guest
> notifiers has been set.
>>      return r;
>>  }
>>
>

Erm, no improvements for me from V1 - brand-new assert at reset and
lack of connectivity.