This patch series adds a virtio transport for AF_VSOCK (net/vmw_vsock/). AF_VSOCK is designed for communication between virtual machines and hypervisors. It is currently only implemented for VMware's VMCI transport. This series implements the proposed virtio-vsock device specification from here: http://comments.gmane.org/gmane.comp.emulators.virtio.devel/855 Most of the work was done by Asias He and Gerd Hoffmann a while back. I have picked up the series again. The QEMU userspace changes are here: https://github.com/stefanha/qemu/commits/vsock Why virtio-vsock? ----------------- Guest<->host communication is currently done over the virtio-serial device. This makes it hard to port sockets API-based applications and is limited to static ports. virtio-vsock uses the sockets API so that applications can rely on familiar SOCK_STREAM and SOCK_DGRAM semantics. Applications on the host can easily connect to guest agents because the sockets API allows multiple connections to a listen socket (unlike virtio-serial). This simplifies the guest<->host communication and eliminates the need for extra processes on the host to arbitrate virtio-serial ports. Overview -------- This series adds 3 pieces: 1. virtio_transport_common.ko - core virtio vsock code that uses vsock.ko 2. virtio_transport.ko - guest driver 3. drivers/vhost/vsock.ko - host driver Howto ----- The following kernel options are needed: CONFIG_VSOCKETS=y CONFIG_VIRTIO_VSOCKETS=y CONFIG_VIRTIO_VSOCKETS_COMMON=y CONFIG_VHOST_VSOCK=m Launch QEMU as follows: # qemu ... -device vhost-vsock-pci,id=vhost-vsock-pci0 Guest and host can communicate via AF_VSOCK sockets. The host's CID (address) is 2 and the guest is automatically assigned a CID (use VMADDR_CID_ANY (-1) to bind to it). Status ------ I am auditing and testing the code, while iterating the virtio device specification. There is scope to change both the implementation (these patches) and the virtio device specification. TODO: * Flexible virtqueue descriptor layout * Avoid Linux-specific constants in packet headers (SOCK_STREAM/SOCK_DGRAM) * Send RST if there is no listening SOCK_STREAM socket * Add missing input validation for packet headers and vhost ioctls Asias He (6): VSOCK: Introduce vsock_find_unbound_socket and vsock_bind_dgram_generic Add dgram_skb to vsock_sock VSOCK: Introduce virtio-vsock-common.ko VSOCK: Introduce virtio-vsock.ko VSOCK: Introduce vhost-vsock.ko VSOCK: Add Makefile and Kconfig drivers/vhost/Kconfig | 4 + drivers/vhost/Kconfig.vsock | 7 + drivers/vhost/Makefile | 4 + drivers/vhost/vsock.c | 596 +++++++++++++++ drivers/vhost/vsock.h | 4 + include/linux/virtio_vsock.h | 207 +++++ include/net/af_vsock.h | 3 + include/uapi/linux/virtio_ids.h | 1 + include/uapi/linux/virtio_vsock.h | 80 ++ net/vmw_vsock/Kconfig | 18 + net/vmw_vsock/Makefile | 2 + net/vmw_vsock/af_vsock.c | 71 ++ net/vmw_vsock/virtio_transport.c | 450 +++++++++++ net/vmw_vsock/virtio_transport_common.c | 1248 +++++++++++++++++++++++++++++++ 14 files changed, 2695 insertions(+) create mode 100644 drivers/vhost/Kconfig.vsock create mode 100644 drivers/vhost/vsock.c create mode 100644 drivers/vhost/vsock.h create mode 100644 include/linux/virtio_vsock.h create mode 100644 include/uapi/linux/virtio_vsock.h create mode 100644 net/vmw_vsock/virtio_transport.c create mode 100644 net/vmw_vsock/virtio_transport_common.c -- 2.4.1 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
