On Tue, Jan 14, 2020 at 10:06:18PM +0800, Coiby Xu wrote:
> vhost-user-blk can have played as vhost-user backend but it only supports raw file and don't support VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES operations on raw file (ioctl(fd, BLKDISCARD) is only valid for real block device).
> 
> Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
> ---
>  qemu-vu.c | 264 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 264 insertions(+)
>  create mode 100644 qemu-vu.c

Kevin has been working on qemu-storage-daemon, a tool for running NBD
exports, block jobs, and other storage features that are not part of a
guest.  I think qemu-storage-daemon would be the appropriate tool for
running vhost-user-blk servers.  A dedicated binary is not necessary.

Stefan