On Thu, Aug 10, 2017 at 06:12:27PM +0800, Changpeng Liu wrote:
> Althrough virtio scsi specification was designed as a replacement for
> virtio_blk,
> there are still many users using virtio_blk. Qemu 2.9 introduced a new device
> vhost user scsi which can process I/O in user space for virtio_scsi, this
> commit
> introduces a new vhost user block host device, which can support virtio_blk in
> Guest OS, and I/O processing in another I/O target.
>
> Due to the limitation for virtio_blk specification, virtio_blk device cannot
> get
> block information such as capacity, block size etc via the specification,
> several
> new vhost user messages were added to support deliver virtio config space
> information between Qemu and I/O target,
> VHOST_USER_GET_CONFIG/VHOST_USER_SET_CONFIG
> messages used for get/set config space from/to I/O target,
> VHOST_USER_SET_CONFIG_FD
> was added for event notifier in case the change of virtio config space. Also,
> those
> messages can be used for vhost device live migration as well.
As we are busy wrapping up a QEMU release, please remember to repost after the
release.
> Changpeng Liu (4):
> vhost-user: add new vhost user messages to support virtio config space
> vhost-user-blk: introduce a new vhost-user-blk host device
> contrib/libvhost-user: enable virtio config space messages
> contrib/vhost-user-blk: introduce a vhost-user-blk sample application
>
> .gitignore | 1 +
> Makefile| 3 +
> Makefile.objs | 2 +
> configure | 11 +
> contrib/libvhost-user/libvhost-user.c | 51 +++
> contrib/libvhost-user/libvhost-user.h | 14 +
> contrib/vhost-user-blk/Makefile.objs| 1 +
> contrib/vhost-user-blk/vhost-user-blk.c | 735
>
> docs/interop/vhost-user.txt | 31 ++
> hw/block/Makefile.objs | 3 +
> hw/block/vhost-user-blk.c | 360
> hw/virtio/vhost-user.c | 86
> hw/virtio/vhost.c | 63 +++
> hw/virtio/virtio-pci.c | 55 +++
> hw/virtio/virtio-pci.h | 18 +
> include/hw/virtio/vhost-backend.h | 8 +
> include/hw/virtio/vhost-user-blk.h | 40 ++
> include/hw/virtio/vhost.h | 16 +
> 18 files changed, 1498 insertions(+)
> create mode 100644 contrib/vhost-user-blk/Makefile.objs
> create mode 100644 contrib/vhost-user-blk/vhost-user-blk.c
> create mode 100644 hw/block/vhost-user-blk.c
> create mode 100644 include/hw/virtio/vhost-user-blk.h
>
> --
> 1.9.3
