Re: [Qemu-devel] [PATCH v6 2/4] vhost-user-blk: introduce a new vhost-user-blk host device

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Tue, Dec 05, 2017 at 02:27:17PM +0800, Changpeng Liu wrote:
> This commit introduces a new vhost-user device for block, it uses a
> chardev to connect with the backend, same with Qemu virito-blk device,
> Guest OS still uses the virtio-blk frontend driver.
> 
> To use it, start QEMU with command line like this:
> 
> qemu-system-x86_64 \
>     -chardev socket,id=char0,path=/path/vhost.socket \
>     -device vhost-user-blk-pci,chardev=char0,num-queues=2, \
>             bootindex=2... \
> 
> Users can use different parameters for `num-queues` and `bootindex`.
> 
> Different with exist Qemu virtio-blk host device, it makes more easy
> for users to implement their own I/O processing logic, such as all
> user space I/O stack against hardware block device. It uses the new
> vhost messages(VHOST_USER_GET_CONFIG) to get block virtio config
> information from backend process.
> 
> Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
> ---
>  default-configs/pci.mak            |   1 +
>  hw/block/Makefile.objs             |   3 +
>  hw/block/vhost-user-blk.c          | 357 +++++++++++++++++++++++++++++++++++++
>  hw/virtio/virtio-pci.c             |  55 ++++++
>  hw/virtio/virtio-pci.h             |  18 ++
>  include/hw/virtio/vhost-user-blk.h |  41 +++++
>  6 files changed, 475 insertions(+)
>  create mode 100644 hw/block/vhost-user-blk.c
>  create mode 100644 include/hw/virtio/vhost-user-blk.h

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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