linux-kernel - Re: [PATCH v9 16/17] vduse: Introduce VDUSE

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Date:   Thu, 15 Jul 2021 13:00:56 +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,
        Greg KH <gregkh@...uxfoundation.org>,
        He Zhe <zhe.he@...driver.com>,
        Liu Xiaodong <xiaodong.liu@...el.com>,
        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: [PATCH v9 16/17] vduse: Introduce VDUSE - vDPA Device in
 Userspace


在 2021/7/15 下午12:03, Yongji Xie 写道:
>> Which ioctl can be used for this?
>>
> I mean we can introduce a new ioctl for that in the future.


Ok, I see.


>
>>>> I wonder if it's better to do something similar to ccw:
>>>>
>>>> 1) requires the userspace to update the status bit in the response
>>>> 2) update the dev->status to the status in the response if no timeout
>>>>
>>>> Then userspace could then set NEEDS_RESET if necessary.
>>>>
>>> But NEEDS_RESET does not only happen in this case.
>> Yes, so you need an ioctl for userspace to update the device status
>> (NEEDS_RESET) probably.
>>
> Yes, but I'd like to do that after the initial version is merged since
> NEEDS_RESET is not supported now.


Right.

Thanks


>