Method new

virtio-devices/src/vhost_user/blk.rs:52–200

Create a new vhost-user-blk device

(
        id: String,
        vu_cfg: VhostUserConfig,
        seccomp_action: SeccompAction,
        exit_evt: EventFd,
        access_platform_enabled: bool,
        state: Option<State>,
    )

impl Blk {
    /// Create a new vhost-user-blk device
    pub fn new(
        id: String,
        vu_cfg: VhostUserConfig,
        seccomp_action: SeccompAction,
        exit_evt: EventFd,
        access_platform_enabled: bool,
        state: Option<State>,
    ) -> Result<Blk> {
        let num_queues = vu_cfg.num_queues;

        let mut vu = VhostUserHandle::connect_vhost_user(
            false,
            &vu_cfg.socket,
            num_queues as u64,
            false,
            None,
        )?;

        let (
            avail_features,
            acked_features,
            acked_protocol_features,
            vu_num_queues,
            config,
            paused,
            vring_bases,
        ) = if let Some(state) = state {
            info!("Restoring vhost-user-block {id}");

            vu.set_protocol_features_vhost_user(
                state.acked_features,
                state.acked_protocol_features,
            )?;

            vu.restore_state(&state)?;

            (
                state.avail_features,
                state.acked_features,
                state.acked_protocol_features,
                state.vu_num_queues,
                state.config,
                true,
                state.vring_bases,
            )
        } else {
            // Filling device and vring features VMM supports.
            let mut avail_features = (1 << VIRTIO_BLK_F_SIZE_MAX)
                | (1 << VIRTIO_BLK_F_SEG_MAX)
                | (1 << VIRTIO_BLK_F_GEOMETRY)
                | (1 << VIRTIO_BLK_F_RO)
                | (1 << VIRTIO_BLK_F_BLK_SIZE)
                | (1 << VIRTIO_BLK_F_FLUSH)
                | (1 << VIRTIO_BLK_F_TOPOLOGY)
                | (1 << VIRTIO_BLK_F_CONFIG_WCE)
                | (1 << VIRTIO_BLK_F_DISCARD)
                | (1 << VIRTIO_BLK_F_WRITE_ZEROES)
                | DEFAULT_VIRTIO_FEATURES;