netdev - Re: [RFC v2 06/13] vduse: Introduce VDUSE

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Message-ID: <a47ecb89-b677-2001-5573-d71be5edd4c9@redhat.com>
Date:   Fri, 25 Dec 2020 14:59:21 +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>, sgarzare@...hat.com,
        Parav Pandit <parav@...dia.com>, akpm@...ux-foundation.org,
        Randy Dunlap <rdunlap@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk,
        axboe@...nel.dk, bcrl@...ck.org, corbet@....net,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC v2 06/13] vduse: Introduce VDUSE - vDPA Device in Userspace


On 2020/12/24 下午4:34, Yongji Xie wrote:
>> Yes, the disadvantage is the performance. But it should be simpler (I
>> guess) and we know it can succeed.
>>
> Yes, another advantage is that we can support the VM using anonymous memory.


Exactly.


>
>>> I think I can try this in v3. And the
>>> MMU-based IOMMU implementation can be a future optimization in the
>>> virtio-vdpa case. What's your opinion?
>> Maybe I was wrong, but I think we can try as what has been proposed here
>> first and use shadow virtqueue as backup plan if we fail.
>>
> OK, I will continue to work on this proposal.


Thanks

>