Re: [Qemu-devel] [PATCH v3 12/12] virtio-scsi-dataplane: Add "device IO" op blocker listener

[Paolo Bonzini <pbonzini@redhat.com>]

On 15/05/2015 09:03, Fam Zheng wrote:
> On Fri, 05/15 08:50, Paolo Bonzini wrote:
>>
>>
>> On 15/05/2015 08:04, Fam Zheng wrote:
>>> @@ -111,6 +111,10 @@ static void virtio_scsi_iothread_handle_ctrl(EventNotifier *notifier)
>>>      VirtIOSCSI *s = VIRTIO_SCSI(vring->parent);
>>>      VirtIOSCSIReq *req;
>>>  
>>> +    if (s->pause_counter) {
>>> +        virtio_scsi_stop_ioeventfd(s);
>>> +        return;
>>> +    }
>>>      event_notifier_test_and_clear(notifier);
>>>      while ((req = virtio_scsi_pop_req_vring(s, vring))) {
>>>          virtio_scsi_handle_ctrl_req(s, req);
>>> @@ -124,6 +128,10 @@ static void virtio_scsi_iothread_handle_event(EventNotifier *notifier)
>>>      VirtIOSCSI *s = vring->parent;
>>>      VirtIODevice *vdev = VIRTIO_DEVICE(s);
>>>  
>>> +    if (s->pause_counter) {
>>> +        virtio_scsi_stop_ioeventfd(s);
>>> +        return;
>>> +    }
>>>      event_notifier_test_and_clear(notifier);
>>>  
>>>      if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
>>
>> Why are these needed?
> 
> Not strictly. I think it's something like an "assert(!s->pause_counter)" but
> said gently.

Why be gentle? :)

Paolo