vsock

Package vsock provides access to Linux VM sockets (AF_VSOCK) for communication between a hypervisor and its virtual machines. MIT Licensed.

Go 1.11+ is required to use package vsock.

For more information about VM sockets, check out my blog about Linux VM sockets in Go.

Requirements

To make use of VM sockets with QEMU and virtio-vsock, you must have:

• a Linux hypervisor with kernel 4.8+
• a Linux virtual machine on that hypervisor with kernel 4.8+
• QEMU 2.8+ on the hypervisor, running the virtual machine

Before using VM sockets, following modules must be removed on hypervisor:

• modprobe -r vmw_vsock_vmci_transport
• modprobe -r vmw_vsock_virtio_transport_common
• modprobe -r vsock

Once removed, vhost_vsock module needs to be enabled on hypervisor:

• modprobe vhost_vsock

On VM, you have to enable vmw_vsock_virtio_transport module. This module should automatically load during boot when the vsock device is detected.

To utilize VM sockets, VM needs to be powered on with following -device flag:

• -device vhost-vsock-pci,id=vhost-vsock-pci0,guest-cid=3

Check out the QEMU wiki page on virtio-vsock for more details. More detail on setting up this environment will be provided in the future.

Usage

To try out VM sockets and see an example of how they work, see cmd/vscp. This command shows usage of the vsock.ListenStream and vsock.DialStream APIs, and allows users to easily test VM sockets on their systems.