Method new

devices/src/ivshmem.rs:112–182

(
        id: String,
        region_size: u64,
        backend_file: Option<PathBuf>,
        ivshmem_ops: Arc<Mutex<dyn IvshmemOps>>,
        snapshot: Option<&Snapshot>,
    )

impl IvshmemDevice {
    pub fn new(
        id: String,
        region_size: u64,
        backend_file: Option<PathBuf>,
        ivshmem_ops: Arc<Mutex<dyn IvshmemOps>>,
        snapshot: Option<&Snapshot>,
    ) -> Result<Self, IvshmemError> {
        let pci_configuration_state = vm_migration::state_from_id(snapshot, PCI_CONFIGURATION_ID)
            .map_err(|e| {
            IvshmemError::RetrievePciConfigurationState(anyhow!(
                "Failed to get PciConfigurationState from Snapshot: {e}",
            ))
        })?;

        let state: Option<IvshmemDeviceState> = snapshot
            .as_ref()
            .map(|s| s.to_state())
            .transpose()
            .map_err(|e| {
                IvshmemError::RetrieveIvshmemDeviceStateState(anyhow!(
                    "Failed to get IvshmemDeviceState from Snapshot: {e}",
                ))
            })?;

        let configuration = PciConfiguration::new(
            IVSHMEM_VENDOR_ID,
            IVSHMEM_DEVICE_ID,
            0x1,
            PciClassCode::MemoryController,
            &IvshmemSubclass::Other,
            None,
            PciHeaderType::Device,
            0,
            0,
            None,
            pci_configuration_state,
        );

        let device = if let Some(s) = state {
            IvshmemDevice {
                id,
                configuration,
                bar_regions: vec![],
                _interrupt_mask: s.interrupt_mask,
                _interrupt_status: Arc::new(AtomicU32::new(s.interrupt_status)),
                _iv_position: s.iv_position,
                _doorbell: s.doorbell,
                region_size,
                ivshmem_ops,
                region: None,
                userspace_mapping: None,
                backend_file,
            }
        } else {
            IvshmemDevice {
                id,
                configuration,
                bar_regions: vec![],