Note: the virtio-vsock device specification is currently under review but not yet finalized. Please review this code but don't merge until I send an update when the spec is finalized. Thanks! v3: * Remove unnecessary 3-way handshake, just do REQUEST/RESPONSE instead of REQUEST/RESPONSE/ACK * Remove SOCK_DGRAM support and focus on SOCK_STREAM first (also drop v2 Patch 1, it's only needed for SOCK_DGRAM) * Only allow host->guest connections (same security model as latest VMware) * Don't put vhost vsock driver into staging * Add missing Kconfig dependencies (Arnd Bergmann <arnd@xxxxxxxx>) * Remove unneeded variable used to store return value (Fengguang Wu <fengguang.wu@xxxxxxxxx> and Julia Lawall <julia.lawall@xxxxxxx>) v2: * Rebased onto Linux v4.4-rc2 * vhost: Refuse to assign reserved CIDs * vhost: Refuse guest CID if already in use * vhost: Only accept correctly addressed packets (no spoofing!) * vhost: Support flexible rx/tx descriptor layout * vhost: Add missing total_tx_buf decrement * virtio_transport: Fix total_tx_buf accounting * virtio_transport: Add virtio_transport global mutex to prevent races * common: Notify other side of SOCK_STREAM disconnect (fixes shutdown semantics) * common: Avoid recursive mutex_lock(tx_lock) for write_space (fixes deadlock) * common: Define VIRTIO_VSOCK_TYPE_STREAM/DGRAM hardware interface constants * common: Define VIRTIO_VSOCK_SHUTDOWN_RCV/SEND hardware interface constants * common: Fix peer_buf_alloc inheritance on child socket 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://permalink.gmane.org/gmane.comp.emulators.virtio.devel/980 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 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-cid=3 Guest and host can communicate via AF_VSOCK sockets. The host's CID (address) is 2 and the guest must be assigned a CID (3 in the example above). Status ------ This patch series implements the latest draft specification. Please review. Asias He (4): VSOCK: Introduce virtio-vsock-common.ko VSOCK: Introduce virtio-vsock.ko VSOCK: Introduce vhost-vsock.ko VSOCK: Add Makefile and Kconfig drivers/vhost/Kconfig | 10 + drivers/vhost/Makefile | 4 + drivers/vhost/vsock.c | 628 +++++++++++++++++++++++ drivers/vhost/vsock.h | 4 + include/linux/virtio_vsock.h | 203 ++++++++ include/uapi/linux/virtio_ids.h | 1 + include/uapi/linux/virtio_vsock.h | 87 ++++ net/vmw_vsock/Kconfig | 18 + net/vmw_vsock/Makefile | 2 + net/vmw_vsock/virtio_transport.c | 466 +++++++++++++++++ net/vmw_vsock/virtio_transport_common.c | 854 ++++++++++++++++++++++++++++++++ 11 files changed, 2277 insertions(+) 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 -- 2.5.0 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
