Re: [Qemu-devel] [PATCH v3 0/7] Vhost-pci for inter-VM communication

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

On Tue, Dec 05, 2017 at 11:33:09AM +0800, Wei Wang wrote:
> Vhost-pci is a point-to-point based inter-VM communication solution. This
> patch series implements the vhost-pci-net device setup and emulation. The
> device is implemented as a virtio device, and it is set up via the
> vhost-user protocol to get the neessary info (e.g the memory info of the
> remote VM, vring info).
> 
> Currently, only the fundamental functions are implemented. More features,
> such as MQ and live migration, will be updated in the future.
> 
> The DPDK PMD of vhost-pci has been posted to the dpdk mailinglist here:
> http://dpdk.org/ml/archives/dev/2017-November/082615.html
> 
> v2->v3 changes:
> 1) static device creation: instead of creating and hot-plugging the
>    device when receiving a vhost-user msg, the device is not created
>    via the qemu booting command line.
> 2) remove vqs: rq and ctrlq are removed in this version.
>     - receive vq: the receive vq is not needed anymore. The PMD directly
>                   shares the remote txq and rxq - grab from remote txq to
>                   receive packets, and put to rxq to send packets.
>     - ctrlq: the ctrlq is replaced by the first 4KB metadata area of the
>              device Bar-2.
> 3) simpler implementation: the entire implementation has been tailored
>    from ~1800 LOC to ~850 LOC.

Pls always include full change log, so pls add v1->v2 as well.
Also pls include the link to the spec you posted previously
(not required to be 100% in sync, but pls list main
differences).

> Wei Wang (7):
>   vhost-user: share the vhost-user protocol related structures
>   vhost-pci-net: add vhost-pci-net
>   virtio/virtio-pci.c: add vhost-pci-net-pci
>   vhost-pci-slave: add vhost-pci slave implementation
>   vhost-user: VHOST_USER_SET_VHOST_PCI msg
>   vhost-pci-slave: handle VHOST_USER_SET_VHOST_PCI
>   virtio/vhost.c: vhost-pci needs remote gpa
> 
>  hw/net/Makefile.objs                           |   2 +-
>  hw/net/vhost_net.c                             |  37 +++
>  hw/net/vhost_pci_net.c                         | 137 +++++++++++
>  hw/virtio/Makefile.objs                        |   1 +
>  hw/virtio/vhost-pci-slave.c                    | 310 +++++++++++++++++++++++++
>  hw/virtio/vhost-user.c                         | 117 ++--------
>  hw/virtio/vhost.c                              |  63 +++--
>  hw/virtio/virtio-pci.c                         |  55 +++++
>  hw/virtio/virtio-pci.h                         |  14 ++
>  include/hw/pci/pci.h                           |   1 +
>  include/hw/virtio/vhost-backend.h              |   2 +
>  include/hw/virtio/vhost-pci-net.h              |  42 ++++
>  include/hw/virtio/vhost-pci-slave.h            |  12 +
>  include/hw/virtio/vhost-user.h                 | 108 +++++++++
>  include/hw/virtio/vhost.h                      |   2 +
>  include/net/vhost_net.h                        |   2 +
>  include/standard-headers/linux/vhost_pci_net.h |  65 ++++++
>  include/standard-headers/linux/virtio_ids.h    |   1 +
>  18 files changed, 851 insertions(+), 120 deletions(-)
>  create mode 100644 hw/net/vhost_pci_net.c
>  create mode 100644 hw/virtio/vhost-pci-slave.c
>  create mode 100644 include/hw/virtio/vhost-pci-net.h
>  create mode 100644 include/hw/virtio/vhost-pci-slave.h
>  create mode 100644 include/hw/virtio/vhost-user.h
>  create mode 100644 include/standard-headers/linux/vhost_pci_net.h
> 
> -- 
> 2.7.4