vmm: Create virtio-vsock device

Based on previous patch introducing the new flag "--vsock", this commit
creates a new virtio-vsock device based on the presence of this flag.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/device_manager.rs

@@ -73,6 +73,9 @@ pub enum DeviceManagerError {
     /// Cannot create virtio-pmem device
     CreateVirtioPmem(io::Error),
 
+    /// Cannot create virtio-vsock device
+    CreateVirtioVsock(io::Error),
+
     /// Failed parsing disk image format
     DetectImageType(qcow::Error),
 
@@ -460,6 +463,9 @@ impl DeviceManager {
             &interrupt_info,
         )?;
 
+        // Add virtio-vsock if required
+        DeviceManager::add_virtio_vsock_devices(vm_info, allocator, pci, buses, &interrupt_info)?;
+
         Ok(())
     }
 
@@ -785,6 +791,34 @@ impl DeviceManager {
         Ok(())
     }
 
+    fn add_virtio_vsock_devices(
+        vm_info: &VmInfo,
+        allocator: &mut SystemAllocator,
+        pci: &mut PciConfigIo,
+        buses: &mut BusInfo,
+        interrupt_info: &InterruptInfo,
+    ) -> DeviceManagerResult<()> {
+        // Add vsock if required
+        if let Some(vsock_list_cfg) = &vm_info.vm_cfg.vsock {
+            for vsock_cfg in vsock_list_cfg.iter() {
+                let vsock_device = vm_virtio::Vsock::new(vsock_cfg.cid)
+                    .map_err(DeviceManagerError::CreateVirtioVsock)?;
+
+                DeviceManager::add_virtio_pci_device(
+                    Box::new(vsock_device),
+                    vm_info.memory,
+                    allocator,
+                    vm_info.vm_fd,
+                    pci,
+                    buses,
+                    &interrupt_info,
+                )?;
+            }
+        }
+
+        Ok(())
+    }
+
     fn create_kvm_device(vm: &Arc<VmFd>) -> DeviceManagerResult<DeviceFd> {
         let mut vfio_dev = kvm_bindings::kvm_create_device {
             type_: kvm_bindings::kvm_device_type_KVM_DEV_TYPE_VFIO,