Re: [PATCH v8 0/4] vhost-user block device backend implementation

[Stefano Garzarella <sgarzare@redhat.com>]

On Mon, Jun 15, 2020 at 02:46:40AM +0800, Coiby Xu wrote:
> Hi Stefano Garzarella,
> 
> On Thu, Jun 11, 2020 at 02:37:03PM +0200, Stefano Garzarella wrote:
> > Hi Coiby Xu,
> > 
> > On Fri, Jun 05, 2020 at 07:35:34AM +0800, Coiby Xu wrote:
> > > v8
> > >  - re-try connecting to socket server to fix asan error
> > >  - fix license naming issue
> > > 
> > > v7
> > >  - fix docker-test-debug@fedora errors by freeing malloced memory
> > > 
> > > v6
> > >  - add missing license header and include guard
> > >  - vhost-user server only serve one client one time
> > >  - fix a bug in custom vu_message_read
> > >  - using qemu-storage-daemon to start vhost-user-blk-server
> > >  - a bug fix to pass docker-test-clang@ubuntu
> > > 
> > > v5:
> > >  * re-use vu_kick_cb in libvhost-user
> > >  * keeping processing VhostUserMsg in the same coroutine until there is
> > >    detachment/attachment of AIOContext
> > >  * Spawn separate coroutine for each VuVirtqElement
> > >  * Other changes including relocating vhost-user-blk-server.c, coding
> > >    style etc.
> > > 
> > > v4:
> > >  * add object properties in class_init
> > >  * relocate vhost-user-blk-test
> > >  * other changes including using SocketAddress, coding style, etc.
> > > 
> > > v3:
> > >  * separate generic vhost-user-server code from vhost-user-blk-server
> > >    code
> > >  * re-write vu_message_read and kick hander function as coroutines to
> > >    directly call blk_co_preadv, blk_co_pwritev, etc.
> > >  * add aio_context notifier functions to support multi-threading model
> > >  * other fixes regarding coding style, warning report, etc.
> > > 
> > > v2:
> > >  * Only enable this feature for Linux because eventfd is a Linux-specific
> > >    feature
> > > 
> > > 
> > > This patch series is an implementation of vhost-user block device
> > > backend server, thanks to Stefan and Kevin's guidance.
> > > 
> > > Vhost-user block device backend server is a UserCreatable object and can be
> > > started using object_add,
> > > 
> > >  (qemu) object_add vhost-user-blk-server,id=ID,unix-socket=/tmp/vhost-user-blk_vhost.socket,node-name=DRIVE_NAME,writable=off,blk-size=512
> > >  (qemu) object_del ID
> > > 
> > > or appending the "-object" option when starting QEMU,
> > > 
> > >   $ -object vhost-user-blk-server,id=disk,unix-socket=/tmp/vhost-user-blk_vhost.socket,node-name=DRIVE_NAME,writable=off,blk-size=512
> > > 
> > > Then vhost-user client can connect to the server backend.
> > > For example, QEMU could act as a client,
> > > 
> > >   $ -m 256 -object memory-backend-memfd,id=mem,size=256M,share=on -numa node,memdev=mem -chardev socket,id=char1,path=/tmp/vhost-user-blk_vhost.socket -device vhost-user-blk-pci,id=blk0,chardev=char1
> > > 
> > > And guest OS could access this vhost-user block device after mounting it.
> > > 
> > > Coiby Xu (4):
> > >   Allow vu_message_read to be replaced
> > >   generic vhost user server
> > >   vhost-user block device backend server
> > >   new qTest case to test the vhost-user-blk-server
> > > 
> > >  block/Makefile.objs                        |   1 +
> > >  block/export/vhost-user-blk-server.c       | 716 ++++++++++++++++++++
> > >  block/export/vhost-user-blk-server.h       |  34 +
> > >  contrib/libvhost-user/libvhost-user-glib.c |   2 +-
> > >  contrib/libvhost-user/libvhost-user.c      |  11 +-
> > >  contrib/libvhost-user/libvhost-user.h      |  21 +
> > >  softmmu/vl.c                               |   4 +
> > >  tests/Makefile.include                     |   3 +-
> > >  tests/qtest/Makefile.include               |   2 +
> > >  tests/qtest/libqos/vhost-user-blk.c        | 130 ++++
> > >  tests/qtest/libqos/vhost-user-blk.h        |  44 ++
> > >  tests/qtest/libqtest.c                     |  54 +-
> > >  tests/qtest/libqtest.h                     |  38 ++
> > >  tests/qtest/vhost-user-blk-test.c          | 737 +++++++++++++++++++++
> > >  tests/vhost-user-bridge.c                  |   2 +
> > >  tools/virtiofsd/fuse_virtio.c              |   4 +-
> > >  util/Makefile.objs                         |   1 +
> > >  util/vhost-user-server.c                   | 406 ++++++++++++
> > >  util/vhost-user-server.h                   |  59 ++
> > >  19 files changed, 2229 insertions(+), 40 deletions(-)
> > >  create mode 100644 block/export/vhost-user-blk-server.c
> > >  create mode 100644 block/export/vhost-user-blk-server.h
> > >  create mode 100644 tests/qtest/libqos/vhost-user-blk.c
> > >  create mode 100644 tests/qtest/libqos/vhost-user-blk.h
> > >  create mode 100644 tests/qtest/vhost-user-blk-test.c
> > >  create mode 100644 util/vhost-user-server.c
> > >  create mode 100644 util/vhost-user-server.h
> > > 
> > 
> > Should we add an entry in the MAINTAINERS file for some of the new files?
> > (e.g. util/vhost-user-server.*)
> 
> Yes, please. Thank you!

I think the best thing should be to edit MAINTAINERS in this series,
since you're adding new files, but I don't know who will maintain them ;-)

Thanks,
Stefano