Features/VirtioVsock: Difference between revisions
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==Language bindings== | ==Language bindings== | ||
* C - use <linux/vm_sockets.h> | * C - use <linux/vm_sockets.h> | ||
* Python - | * Python - starting from Python 3.7 | ||
* Go - [https://github.com/mdlayher/vsock Matt Layher's vsock module] | * Go - [https://github.com/mdlayher/vsock Matt Layher's vsock module] | ||
* Rust | |||
** [https://docs.rs/crate/libc libc crate] (libc::sockaddr_vm, libc::VMADDR_*) | |||
** [https://docs.rs/crate/nix nix crate] (nix::sys::socket::VsockAddr) | |||
==Projects using vsock== | ==Projects using vsock== | ||
Revision as of 09:41, 15 October 2019
virtio-vsock is a host/guest communications device. It allows applications in the guest and host to communicate. This can be used to implement hypervisor services and guest agents (like qemu-guest-agent or SPICE vdagent).
- POSIX Sockets API so existing networking applications require minimal modification (unlike virtio-serial char devices)
- Listen sockets can accept connections from multiple clients (unlike virtio-serial char devices)
- No address configuration required inside the guest
- No Ethernet or TCP/IP for a reduced attack surface for hypervisor services
- Can be used with VMs that have no network interfaces
Sockets are created with the AF_VSOCK address family. The SOCK_STREAM socket type is currently implemented for in-order, guaranteed stream semantics.
Code
- Virtio specification: HTML or virtio.git
- Linux kernel: Upstream since Linux 4.8, or see stefanha's linux.git
- QEMU: Upstream since QEMU 2.8, or see stefanha's qemu.git
Packages
Quickstart
- Host kernel requirements: CONFIG_VHOST_VSOCK=m
- Guest kernel requirements: CONFIG_VIRTIO_VSOCKETS=m
Launch a guest and assign it CID 3:
(host)# qemu-system-x86_64 -device vhost-vsock-pci,guest-cid=3 ...
Language bindings
- C - use <linux/vm_sockets.h>
- Python - starting from Python 3.7
- Go - Matt Layher's vsock module
- Rust
- libc crate (libc::sockaddr_vm, libc::VMADDR_*)
- nix crate (nix::sys::socket::VsockAddr)
Projects using vsock
- nc-vsock - a netcat-like utility for AF_VSOCK
- xpra - X11 persistent remote display server and client
- cloonix_vsock - PTY over AF_VSOCK
- iperf-vsock - iperf3 with AF_VSOCK support
Links
- KVM Forum 2015 presentation: virtio-vsock: Zero-configuration host/guest communication (pdf)
- Connectathon 2016 presentation: NFS over virtio-vsock: Host/guest file sharing for virtual machines (pdf)