Hyper-V Sockets (hv_sock) supplies a byte-stream based communication mechanism between the host and the guest. It's somewhat like TCP over VMBus, but the transportation layer (VMBus) is much simpler than IP.
With Hyper-V Sockets, applications between the host and the guest can talk to each other directly by the traditional BSD-style socket APIs. Hyper-V Sockets is only available on new Windows hosts, like Windows Server 2016. More info is in this article "Make your own integration services": https://msdn.microsoft.com/en-us/virtualization/hyperv_on_windows/develop/make_mgmt_service The patch implements the necessary support in the guest side by introducing a new socket address family AF_HYPERV. Note: the VMBus driver side's supporting patches have been in the mainline tree. I know the kernel has already had a VM Sockets driver (AF_VSOCK) based on VMware VMCI (net/vmw_vsock/, drivers/misc/vmw_vmci), and KVM is proposing AF_VSOCK of virtio version: http://marc.info/?l=linux-netdev&m=145952064004765&w=2 However, though Hyper-V 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 patch. Looking forward to your comments! 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! Changes since v6 (http://lkml.iu.edu/hypermail/linux/kernel/1601.3/01813.html) - only a few minor changes of coding style and comments Dexuan Cui (1): hv_sock: introduce Hyper-V Sockets MAINTAINERS | 2 + include/linux/hyperv.h | 16 + include/linux/socket.h | 5 +- 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 | 1481 +++++++++++++++++++++++++++++++++++++++++++ 10 files changed, 1584 insertions(+), 2 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 -- 2.1.0 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
