| // Copyright 2017 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| use libc; |
| use std::fs::{File, OpenOptions}; |
| use std::os::unix::fs::OpenOptionsExt; |
| use std::os::unix::io::{AsRawFd, RawFd}; |
| |
| use sys_util::{ioctl_with_ref, GuestMemory}; |
| use virtio_sys::{VHOST_VSOCK_SET_GUEST_CID, VHOST_VSOCK_SET_RUNNING}; |
| |
| use super::{ioctl_result, Error, Result, Vhost}; |
| |
| static DEVICE: &'static str = "/dev/vhost-vsock"; |
| |
| /// Handle for running VHOST_VSOCK ioctls. |
| pub struct Vsock { |
| fd: File, |
| mem: GuestMemory, |
| } |
| |
| impl Vsock { |
| /// Open a handle to a new VHOST_VSOCK instance. |
| pub fn new(mem: &GuestMemory) -> Result<Vsock> { |
| Ok(Vsock { |
| fd: OpenOptions::new() |
| .read(true) |
| .write(true) |
| .custom_flags(libc::O_CLOEXEC | libc::O_NONBLOCK) |
| .open(DEVICE) |
| .map_err(Error::VhostOpen)?, |
| mem: mem.clone(), |
| }) |
| } |
| |
| /// Set the CID for the guest. This number is used for routing all data destined for |
| /// programs |
| /// running in the guest. |
| /// |
| /// # Arguments |
| /// * `cid` - CID to assign to the guest |
| pub fn set_cid(&self, cid: u64) -> Result<()> { |
| let ret = unsafe { ioctl_with_ref(&self.fd, VHOST_VSOCK_SET_GUEST_CID(), &cid) }; |
| if ret < 0 { |
| return ioctl_result(); |
| } |
| Ok(()) |
| } |
| |
| /// Tell the VHOST driver to start performing data transfer. |
| pub fn start(&self) -> Result<()> { |
| self.set_running(true) |
| } |
| |
| /// Tell the VHOST driver to stop performing data transfer. |
| pub fn stop(&self) -> Result<()> { |
| self.set_running(false) |
| } |
| |
| fn set_running(&self, running: bool) -> Result<()> { |
| let on: ::std::os::raw::c_int = if running { 1 } else { 0 }; |
| let ret = unsafe { ioctl_with_ref(&self.fd, VHOST_VSOCK_SET_RUNNING(), &on) }; |
| |
| if ret < 0 { |
| return ioctl_result(); |
| } |
| Ok(()) |
| } |
| } |
| |
| impl Vhost for Vsock { |
| fn mem(&self) -> &GuestMemory { |
| &self.mem |
| } |
| } |
| |
| impl AsRawFd for Vsock { |
| fn as_raw_fd(&self) -> RawFd { |
| self.fd.as_raw_fd() |
| } |
| } |