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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

Joshua - this isn't very digestible.

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https://bugs.launchpad.net/bugs/1541585

Title:
  [Hyper-V] VM Sockets

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  Dexuan Cui of Microsoft has submitted upstream the a VM Sockets for
  Hyper-V feature. The V6 series of this feature set was submitted on
  January 26th so it seems likely that the discussion is winding down
  and the feature is ripe for inclusion. We'd like it considered for
  Ubuntu 16.04.

  Here's the latest Part 0 description from lkml:

  From: Dexuan Cui decui@xxxxxxxxxxxxx via vger.kernel.org
   
   Changes since v1:
   - updated "[PATCH 6/7] hvsock: introduce Hyper-V VM Sockets feature"
   - added __init and __exit for the module init/exit functions
   - net/hv_sock/Kconfig: "default m" -> "default m if HYPERV"
   - MODULE_LICENSE: "Dual MIT/GPL" -> "Dual BSD/GPL"

  Changes since v2:
   - fixed various coding issue pointed out by David Miller
   - fixed indentation issues
   - removed pr_debug in net/hv_sock/af_hvsock.c
   - used reverse-Chrismas-tree style for local variables.
   - EXPORT_SYMBOL -> EXPORT_SYMBOL_GPL

  Changes since v3:
   - fixed a few coding issue pointed by Vitaly Kuznetsov and Dan Carpenter
   - fixed the ret value in vmbus_recvpacket_hvsock on error
   - fixed the style of multi-line comment: vmbus_get_hvsock_rw_status()

  Changes since v4 (https://lkml.org/lkml/2015/7/28/404):
   - addressed all the comments about V4.
   - treat the hvsock offers/channels as special VMBus devices
   - add a mechanism to pass hvsock events to the hvsock driver
   - fixed some corner cases with proper locking when a connection is closed
   - rebased to the latest Greg's tree

  Changes since v5 (https://lkml.org/lkml/2015/12/24/103):
   - addressed the coding style issues (Vitaly Kuznetsov & David Miller, thanks!)
   - used a better coding for the per-channel rescind callback (Thank Vitaly!)
   - avoided the introduction of new VMBUS driver APIs vmbus_sendpacket_hvsock()
   and vmbus_recvpacket_hvsock() and used vmbus_sendpacket()/vmbus_recvpacket()
   in the higher level (i.e., the vmsock driver). Thank Vitaly!

  Hyper-V VM Socket (hv_sock) is a byte-stream based communication mechanism
   between Windowsd 10 (or later) host and a guest. It's kind of TCP over
   VMBus, but the transportation layer (VMBus) is much simpler than IP.
   With Hyper-V VM Sockets, applications between the host and a guest can
   talk with each other directly by the traditional BSD-style socket APIs.

  The patchset implements the necessary support in the guest side by adding
   the necessary new APIs in the vmbus driver, and introducing a new driver
   hv_sock.ko, which implements_a new socket address family AF_HYPERV.

  I know the kernel has already had a VM Sockets driver (AF_VSOCK) based
   on VMware's VMCI (net/vmw_vsock/, drivers/misc/vmw_vmci), and KVM is
   proposing AF_VSOCK of virtio version:
  http://thread.gmane.org/gmane.linux.network/365205.

  However, though Hyper-V VM Sockets may seem conceptually similar to
   AF_VOSCK, there are differences in the transportation layer, and IMO these
   make the direct code reusing impractical:

  1. In AF_VSOCK, the endpoint type is: <u32 ContextID, u32 Port>, but in
   AF_HYPERV, the endpoint type is: <GUID VM_ID, GUID ServiceID>. Here GUID
   is 128-bit.

  2. AF_VSOCK supports SOCK_DGRAM, while AF_HYPERV doesn't.

  3. AF_VSOCK supports some special sock opts, like SO_VM_SOCKETS_BUFFER_SIZE,
   SO_VM_SOCKETS_BUFFER_MIN/MAX_SIZE and SO_VM_SOCKETS_CONNECT_TIMEOUT.
   These are meaningless to AF_HYPERV.

  4. Some AF_VSOCK's VMCI transportation ops are meanless to AF_HYPERV/VMBus,
   like .notify_recv_init
           .notify_recv_pre_block
           .notify_recv_pre_dequeue
           .notify_recv_post_dequeue
           .notify_send_init
           .notify_send_pre_block
           .notify_send_pre_enqueue
           .notify_send_post_enqueue
   etc.

  So I think we'd better introduce a new address family: AF_HYPERV.

  Please review the patchset.

  Looking forward to your comments!

  Dexuan Cui (9):
     Drivers: hv: vmbus: add a helper function to set a channel's pending
       send size
     Drivers: hv: vmbus: define the new offer type for Hyper-V socket
       (hvsock)
     Drivers: hv: vmbus: define a new VMBus message type for hvsock
     Drivers: hv: ring_buffer: enhance hv_ringbuffer_read() to support
       hvsock
     Drivers: hv: vmbus: add APIs to send/recv hvsock packets
     Drivers: hv: vmbus: add a hvsock flag in struct hv_driver
     Drivers: hv: vmbus: add a mechanism to pass hvsock events to the
       hvsock driver
     Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()
     hvsock: introduce Hyper-V VM Sockets feature

   MAINTAINERS | 2 +
    drivers/hv/channel.c | 84 ++-
    drivers/hv/channel_mgmt.c | 53 +-
    drivers/hv/connection.c | 4 +-
    drivers/hv/hyperv_vmbus.h | 13 +-
    drivers/hv/ring_buffer.c | 54 +-
    drivers/hv/vmbus_drv.c | 4 +
    include/linux/hyperv.h | 88 +++
    include/linux/socket.h | 4 +-
    include/net/af_hvsock.h | 44 ++
    include/uapi/linux/hyperv.h | 16 +
    net/Kconfig | 1 +
    net/Makefile | 1 +
    net/hv_sock/Kconfig | 10 +
    net/hv_sock/Makefile | 3 +
    net/hv_sock/af_hvsock.c | 1473 +++++++++++++++++++++++++++++++++++++++++++
    16 files changed, 1830 insertions(+), 24 deletions(-)
    create mode 100644 include/net/af_hvsock.h
    create mode 100644 net/hv_sock/Kconfig
    create mode 100644 net/hv_sock/Makefile
    create mode 100644 net/hv_sock/af_hvsock.c

  --
   2.1.4

  Dexuan Cui (8):
     Drivers: hv: vmbus: add a helper function to set a channel's pending
       send size
     Drivers: hv: vmbus: define the new offer type for Hyper-V socket
       (hvsock)
     Drivers: hv: vmbus: vmbus_sendpacket_ctl: hvsock: avoid unnecessary
       signaling
     Drivers: hv: vmbus: define a new VMBus message type for hvsock
     Drivers: hv: vmbus: add a hvsock flag in struct hv_driver
     Drivers: hv: vmbus: add a per-channel rescind callback
     Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()
     hvsock: introduce Hyper-V Socket feature

   MAINTAINERS | 2 +
    drivers/hv/channel.c | 21 +-
    drivers/hv/channel_mgmt.c | 46 +-
    drivers/hv/connection.c | 4 +-
    drivers/hv/vmbus_drv.c | 4 +
    include/linux/hyperv.h | 67 ++
    include/linux/socket.h | 4 +-
    include/net/af_hvsock.h | 51 ++
    include/uapi/linux/hyperv.h | 16 +
    net/Kconfig | 1 +
    net/Makefile | 1 +
    net/hv_sock/Kconfig | 10 +
    net/hv_sock/Makefile | 3 +
    net/hv_sock/af_hvsock.c | 1480 +++++++++++++++++++++++++++++++++++++++++++
    14 files changed, 1702 insertions(+), 8 deletions(-)
    create mode 100644 include/net/af_hvsock.h
    create mode 100644 net/hv_sock/Kconfig
    create mode 100644 net/hv_sock/Makefile
    create mode 100644 net/hv_sock/af_hvsock.c

  There are, as yet, no pieces of this upstream submitted committed to
  Linus's tree.

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