Hyper-V VM Sockets (hvsock) 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 (7): 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: vmbus: add APIs to send/recv hvsock packet and get the r/w-ability Drivers: hv: vmbus: add APIs to register callbacks to process hvsock connection Drivers: hv: vmbus: add a helper function to set a channel's pending send size hvsock: introduce Hyper-V VM Sockets feature Drivers: hv: vmbus: disable local interrupt when hvsock's callback is running MAINTAINERS | 2 + drivers/hv/Makefile | 4 +- drivers/hv/channel.c | 146 ++++ drivers/hv/channel_mgmt.c | 13 + drivers/hv/connection.c | 15 +- drivers/hv/hvsock_callbacks.c | 71 ++ drivers/hv/hyperv_vmbus.h | 4 + drivers/hv/ring_buffer.c | 14 + include/linux/hyperv.h | 68 ++ 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 | 5 + net/hv_sock/af_hvsock.c | 1463 +++++++++++++++++++++++++++++++++++++++++ 17 files changed, 1878 insertions(+), 3 deletions(-) create mode 100644 drivers/hv/hvsock_callbacks.c 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 devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
