Re: [PATCH v5 0/8] Support exporting BDSs via VDUSE

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, May 04, 2022 at 03:40:43PM +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.
> 
> Since we don't support vdpa-blk in QEMU currently, the VM case is
> tested with my previous patchset [2].
> 
> [1] https://www.kernel.org/doc/html/latest/userspace-api/vduse.html
> [2] https://www.mail-archive.com/qemu-devel@nongnu.org/msg797569.html
> 
> Please review, thanks!

This needs review by storage maintainers.

> V4 to V5:
> - Abstract out the logic for virito-blk I/O process from
>   vhost-user-blk-server and reuse it [Kevin]
> - Fix missing VIRTIO_BLK_F_FLUSH [Kevin]
> - Support discard and write_zeroes [Kevin]
> - Rebase to the newest tree
> 
> V3 to V4:
> - Fix some comments on QAPI [Eric]
> 
> V2 to V3:
> - Introduce vduse_get_virtio_features() [Stefan]
> - Update MAINTAINERS file [Stefan]
> - Fix handler of VIRTIO_BLK_T_GET_ID request [Stefan]
> - Add barrier for vduse_queue_inflight_get() [Stefan]
> 
> V1 to V2:
> - Move vduse header to linux-headers [Stefan]
> - Add two new API to support creating device from /dev/vduse/$NAME or
>   file descriptor [Stefan]
> - Check VIRTIO_F_VERSION_1 during intialization [Stefan]
> - Replace malloc() + memset to calloc() [Stefan]
> - Increase default queue size to 256 for vduse-blk [Stefan]
> - Zero-initialize virtio-blk config space [Stefan]
> - Add a patch to support reset blk->dev_ops
> - Validate vq->log->inflight fields [Stefan]
> - Add vduse_set_reconnect_log_file() API to support specifing the
>   reconnect log file
> - Fix some bugs [Stefan]
> 
> Xie Yongji (8):
>   block: Support passing NULL ops to blk_set_dev_ops()
>   block-backend: Introduce blk_get_guest_block_size()
>   block/export: Abstract out the logic of virtio-blk I/O process
>   linux-headers: Add vduse.h
>   libvduse: Add VDUSE (vDPA Device in Userspace) library
>   vduse-blk: Implement vduse-blk export
>   vduse-blk: Add vduse-blk resize support
>   libvduse: Add support for reconnecting
> 
>  MAINTAINERS                                 |    9 +
>  block/block-backend.c                       |    8 +-
>  block/export/export.c                       |    6 +
>  block/export/meson.build                    |    7 +-
>  block/export/vduse-blk.c                    |  346 +++++
>  block/export/vduse-blk.h                    |   20 +
>  block/export/vhost-user-blk-server.c        |  249 +---
>  block/export/virtio-blk-handler.c           |  237 ++++
>  block/export/virtio-blk-handler.h           |   33 +
>  include/sysemu/block-backend-io.h           |    1 +
>  linux-headers/linux/vduse.h                 |  306 ++++
>  meson.build                                 |   28 +
>  meson_options.txt                           |    4 +
>  qapi/block-export.json                      |   25 +-
>  scripts/meson-buildoptions.sh               |    7 +
>  scripts/update-linux-headers.sh             |    2 +-
>  subprojects/libvduse/include/atomic.h       |    1 +
>  subprojects/libvduse/include/compiler.h     |    1 +
>  subprojects/libvduse/libvduse.c             | 1386 +++++++++++++++++++
>  subprojects/libvduse/libvduse.h             |  247 ++++
>  subprojects/libvduse/linux-headers/linux    |    1 +
>  subprojects/libvduse/meson.build            |   10 +
>  subprojects/libvduse/standard-headers/linux |    1 +
>  23 files changed, 2695 insertions(+), 240 deletions(-)
>  create mode 100644 block/export/vduse-blk.c
>  create mode 100644 block/export/vduse-blk.h
>  create mode 100644 block/export/virtio-blk-handler.c
>  create mode 100644 block/export/virtio-blk-handler.h
>  create mode 100644 linux-headers/linux/vduse.h
>  create mode 120000 subprojects/libvduse/include/atomic.h
>  create mode 120000 subprojects/libvduse/include/compiler.h
>  create mode 100644 subprojects/libvduse/libvduse.c
>  create mode 100644 subprojects/libvduse/libvduse.h
>  create mode 120000 subprojects/libvduse/linux-headers/linux
>  create mode 100644 subprojects/libvduse/meson.build
>  create mode 120000 subprojects/libvduse/standard-headers/linux
> 
> -- 
> 2.20.1