Re: [PATCH v6 0/8] Support exporting BDSs via VDUSE

[Yongji Xie]

On Wed, May 25, 2022 at 7:02 PM Stefan Hajnoczi <stefanha@redhat.com> wrote:
>
> On Mon, May 23, 2022 at 04:46:03PM +0800, Xie Yongji wrote:
> > Hi all,
> >
> > Last few months ago, VDUSE (vDPA Device in Userspace) [1] has
> > been merged into Linux kernel as a framework that make it
> > possible to emulate a vDPA device in userspace. This series
> > aimed at implementing a VDUSE block backend based on the
> > qemu-storage-daemon infrastructure.
> >
> > To support that, we firstly introduce a VDUSE library as a
> > subproject (like what libvhost-user does) to help implementing
> > VDUSE backends in QEMU. Then a VDUSE block export is implemented
> > based on this library. At last, we add resize and reconnect support
> > to the VDUSE block export and VDUSE library.
> >
> > Now this series is based on Stefan's patch [2]. And since we don't
> > support vdpa-blk in QEMU currently, the VM case is tested with my
> > previous patchset [3].
> >
> > [1] https://www.kernel.org/doc/html/latest/userspace-api/vduse.html
> > [2] 
> > 20220518130945.2657905-1-stefanha@redhat.com/">https://lore.kernel.org/all/20220518130945.2657905-1-stefanha@redhat.com/
> > [3] https://www.mail-archive.com/qemu-devel@nongnu.org/msg797569.html
> >
> > Please review, thanks!
>
> Thanks, applied to my block tree:
> https://gitlab.com/stefanha/qemu/commits/block
>
> Successfully manually tested on Linux 5.17.6.
>
> Please send a follow-up patch that adds a tests/qemu-iotests/ test case
> that launches qemu-storage-daemon with a vduse-blk export, writes a
> pattern to the disk, and reads the pattern back to verify it. An
> automated test will prevent bitrot.
>

Will do it.

> I am sending a follow-up patch with documentation so users can discover
> and learn how to use this new feature.
>

OK.

Thanks,
Yongji