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From:   Yongji Xie <xieyongji@bytedance.com>
Date:   Mon, 11 Oct 2021 16:32:43 +0800
Message-ID: <CACycT3tZbWpHg5D4rQqpSd3Yxz6zFCsUj+R=AGH0JRw0gEBNyg@mail.gmail.com>
Subject: Re: [PATCH v13 00/13] Introduce VDUSE - vDPA Device in Userspace
To:     Liuxiangdong <liuxiangdong5@huawei.com>
Cc:     "Fangyi (Eric)" <eric.fangyi@huawei.com>, yebiaoxiang@huawei.com,
        x86@kernel.org, kvm <kvm@vger.kernel.org>,
        linux-fsdevel@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Mon, Oct 11, 2021 at 4:31 PM Yongji Xie <xieyongji@bytedance.com> wrote:
>
> Hi Xiaodong,
>
> On Mon, Oct 11, 2021 at 3:32 PM Liuxiangdong <liuxiangdong5@huawei.com> wrote:
> >
> > Hi, Yongji.
> >
> > I tried vduse with null-blk:
> >
> >    $ qemu-storage-daemon \
> >        --chardev socket,id=charmonitor,path=/tmp/qmp.sock,server,nowait \
> >        --monitor chardev=charmonitor \
> >        --blockdev
> > driver=host_device,cache.direct=on,aio=native,filename=/dev/nullb0,node-name=disk0
> > \
> >        --export
> > type=vduse-blk,id=test,node-name=disk0,writable=on,name=vduse-null,num-queues=16,queue-size=128
> >
> > The qemu-storage-daemon is yours
> > (https://github.com/bytedance/qemu/tree/vduse)
> >
> > And then, how can we use this vduse-null (dev/vduse/vduse-null) in vm(QEMU)?
> >
>
> Then we need to attach this device to vdpa bus via vdpa tool [1]:
>
> # vdpa dev add vduse-null mgmtdev vduse
>

It should be:

# vdpa dev add name vduse-null mgmtdev vduse

Thanks,
Yongji