lkml.org 
[lkml]   [2021]   [May]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v7 11/12] vduse: Introduce VDUSE - vDPA Device in Userspace
From
Date

在 2021/5/27 下午12:57, Yongji Xie 写道:
> On Thu, May 27, 2021 at 12:13 PM Jason Wang <jasowang@redhat.com> wrote:
>>
>> 在 2021/5/17 下午5:55, Xie Yongji 写道:
>>> +
>>> +static int vduse_dev_msg_sync(struct vduse_dev *dev,
>>> + struct vduse_dev_msg *msg)
>>> +{
>>> + init_waitqueue_head(&msg->waitq);
>>> + spin_lock(&dev->msg_lock);
>>> + vduse_enqueue_msg(&dev->send_list, msg);
>>> + wake_up(&dev->waitq);
>>> + spin_unlock(&dev->msg_lock);
>>> + wait_event_killable(msg->waitq, msg->completed);
>>
>> What happens if the userspace(malicous) doesn't give a response forever?
>>
>> It looks like a DOS. If yes, we need to consider a way to fix that.
>>
> How about using wait_event_killable_timeout() instead?


Probably, and then we need choose a suitable timeout and more important,
need to report the failure to virtio.

Thanks


>
> Thanks,
> Yongji
>

\
 
 \ /
  Last update: 2021-05-27 07:00    [W:0.475 / U:0.304 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site