netdev - Re: [PATCH v7 11/12] vduse: Introduce VDUSE

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Message-ID: <5a68bb7c-fd05-ce02-cd61-8a601055c604@redhat.com>
Date:   Thu, 27 May 2021 13:00:07 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Yongji Xie <xieyongji@...edance.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Parav Pandit <parav@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Christian Brauner <christian.brauner@...onical.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, bcrl@...ck.org,
        Jonathan Corbet <corbet@....net>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Dan Carpenter <dan.carpenter@...cle.com>, joro@...tes.org,
        virtualization <virtualization@...ts.linux-foundation.org>,
        netdev@...r.kernel.org, kvm <kvm@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 11/12] vduse: Introduce VDUSE - vDPA Device in
 Userspace


在 2021/5/27 下午12:57, Yongji Xie 写道:
> On Thu, May 27, 2021 at 12:13 PM Jason Wang <jasowang@...hat.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
>