From: Stefan Hajnoczi <stefanha@redhat.com>
To: piaojun <piaojun@huawei.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
"Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org, virtio-fs@redhat.com,
linux-fsdevel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [Virtio-fs] [PATCH 00/18] virtiofs: Fix various races and cleanups round 1
Date: Mon, 9 Sep 2019 18:14:55 +0200 [thread overview]
Message-ID: <20190909161455.GG20875@stefanha-x1.localdomain> (raw)
In-Reply-To: <866a1469-2c4b-59ce-cf3f-32f65e861b99@huawei.com>
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On Sun, Sep 08, 2019 at 07:53:55PM +0800, piaojun wrote:
>
>
> On 2019/9/6 19:52, Miklos Szeredi wrote:
> > On Fri, Sep 6, 2019 at 12:36 PM Stefan Hajnoczi <stefanha@redhat.com> 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@redhat.com> 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.
Live migration is currently unsupported. Hot unplugging the virtio-fs
device would allow the guest to live migrate successfully, so it's a
useful feature to work around the missing live migration support.
Is this what you mean?
Stefan
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next prev parent reply other threads:[~2019-09-09 16:15 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-05 19:48 [PATCH 00/18] virtiofs: Fix various races and cleanups round 1 Vivek Goyal
2019-09-05 19:48 ` [PATCH 01/18] virtiofs: Remove request from processing list before calling end Vivek Goyal
2019-09-06 10:40 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 02/18] virtiofs: Check whether hiprio queue is connected at submission time Vivek Goyal
2019-09-06 10:43 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 03/18] virtiofs: Pass fsvq instead of vq as parameter to virtio_fs_enqueue_req Vivek Goyal
2019-09-06 10:44 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 04/18] virtiofs: Check connected state for VQ_REQUEST queue as well Vivek Goyal
2019-09-06 10:45 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 05/18] Maintain count of in flight requests for VQ_REQUEST queue Vivek Goyal
2019-09-06 10:46 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 06/18] virtiofs: ->remove should not clean virtiofs fuse devices Vivek Goyal
2019-09-06 10:47 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 07/18] virtiofs: Stop virtiofs queues when device is being removed Vivek Goyal
2019-09-06 10:47 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 08/18] virtiofs: Drain all pending requests during ->remove time Vivek Goyal
2019-09-06 10:52 ` Stefan Hajnoczi
2019-09-06 14:17 ` Vivek Goyal
2019-09-06 14:18 ` Michael S. Tsirkin
2019-09-09 16:10 ` Stefan Hajnoczi
2019-09-08 10:11 ` [Virtio-fs] " piaojun
2019-09-05 19:48 ` [PATCH 09/18] virtiofs: Add an helper to start all the queues Vivek Goyal
2019-09-06 10:54 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 10/18] virtiofs: Do not use device managed mem for virtio_fs and virtio_fs_vq Vivek Goyal
2019-09-06 10:56 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 11/18] virtiofs: stop and drain queues after sending DESTROY Vivek Goyal
2019-09-06 11:50 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 12/18] virtiofs: Use virtio_fs_free_devs() in error path Vivek Goyal
2019-09-06 11:51 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 13/18] virtiofs: Do not access virtqueue in request submission path Vivek Goyal
2019-09-06 11:52 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 14/18] virtiofs: Add a fuse_iqueue operation to put() reference Vivek Goyal
2019-09-06 12:00 ` Stefan Hajnoczi
2019-09-06 13:35 ` Vivek Goyal
2019-09-05 19:48 ` [PATCH 15/18] virtiofs: Make virtio_fs object refcounted Vivek Goyal
2019-09-06 12:03 ` Stefan Hajnoczi
2019-09-06 13:50 ` Vivek Goyal
2019-09-09 16:12 ` Stefan Hajnoczi
2019-09-08 11:10 ` [Virtio-fs] " piaojun
2019-09-09 15:35 ` Vivek Goyal
2019-09-05 19:48 ` [PATCH 16/18] virtiofs: Use virtio_fs_mutex for races w.r.t ->remove and mount path Vivek Goyal
2019-09-06 12:05 ` Stefan Hajnoczi
2019-09-06 13:51 ` Vivek Goyal
2019-09-09 16:13 ` Stefan Hajnoczi
2019-09-08 11:19 ` [Virtio-fs] " piaojun
2019-09-05 19:48 ` [PATCH 17/18] virtiofs: Remove TODO to quiesce/end_requests Vivek Goyal
2019-09-06 12:06 ` Stefan Hajnoczi
2019-09-05 19:48 ` [PATCH 18/18] virtiofs: Remove TODO item from virtio_fs_free_devs() Vivek Goyal
2019-09-06 12:06 ` Stefan Hajnoczi
2019-09-06 8:15 ` [PATCH 00/18] virtiofs: Fix various races and cleanups round 1 Miklos Szeredi
2019-09-06 10:36 ` Stefan Hajnoczi
2019-09-06 11:52 ` Miklos Szeredi
2019-09-06 12:08 ` Vivek Goyal
2019-09-06 13:55 ` Miklos Szeredi
2019-09-06 13:57 ` Michael S. Tsirkin
2019-09-06 14:11 ` Miklos Szeredi
2019-09-06 14:17 ` Michael S. Tsirkin
2019-09-08 11:53 ` [Virtio-fs] " piaojun
2019-09-09 16:14 ` Stefan Hajnoczi [this message]
2019-09-09 16:18 ` Michael S. Tsirkin
2019-09-09 23:52 ` piaojun
2019-09-06 13:37 ` Michael S. Tsirkin
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