Re: [Virtio-fs] [PATCH 00/18] virtiofs: Fix various races and cleanups round 1

[piaojun]

On 2019/9/6 19:52, Miklos Szeredi wrote:
> On Fri, Sep 6, 2019 at 12:36 PM Stefan Hajnoczi <stefanha@xxxxxxxxxx> wrote:
>>
>> On Fri, Sep 06, 2019 at 10:15:14AM +0200, Miklos Szeredi wrote:
>>> On Thu, Sep 5, 2019 at 9:49 PM Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:
>>>>
>>>> Hi,
>>>>
>>>> Michael Tsirkin pointed out issues w.r.t various locking related TODO
>>>> items and races w.r.t device removal.
>>>>
>>>> In this first round of cleanups, I have taken care of most pressing
>>>> issues.
>>>>
>>>> These patches apply on top of following.
>>>>
>>>> git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git#virtiofs-v4
>>>>
>>>> I have tested these patches with mount/umount and device removal using
>>>> qemu monitor. For example.
>>>
>>> Is device removal mandatory?  Can't this be made a non-removable
>>> device?  Is there a good reason why removing the virtio-fs device
>>> makes sense?
>>
>> Hot plugging and unplugging virtio PCI adapters is common.  I'd very
>> much like removal to work from the beginning.
> 
> Can you give an example use case?

I think VirtFS migration need hot plugging, or it may cause QEMU crash
or some problems.

Thanks,
Jun