linux-kernel - Re: Re: [PATCH v8 09/10] vduse: Introduce VDUSE

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Date:   Tue, 22 Jun 2021 16:14:53 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Jason Wang <jasowang@...hat.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,
        Greg KH <gregkh@...uxfoundation.org>, songmuchun@...edance.com,
        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: Re: [PATCH v8 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace

On Tue, Jun 22, 2021 at 3:50 PM Jason Wang <jasowang@...hat.com> wrote:
>
>
> 在 2021/6/22 下午3:22, Yongji Xie 写道:
> >> We need fix a way to propagate the error to the userspace.
> >>
> >> E.g if we want to stop the deivce, we will delay the status reset until
> >> we get respose from the userspace?
> >>
> > I didn't get how to delay the status reset. And should it be a DoS
> > that we want to fix if the userspace doesn't give a response forever?
>
>
> You're right. So let's make set_status() can fail first, then propagate
> its failure via VHOST_VDPA_SET_STATUS.
>

OK. So we only need to propagate the failure in the vhost-vdpa case, right?

Thanks,
Yongji