pci, vmm: Include VFIO devices in device tree

Fixes: #1687

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

pci/src/vfio.rs

@@ -221,9 +221,9 @@ impl Interrupt {
 }
 
 #[derive(Copy, Clone)]
-struct MmioRegion {
-    start: GuestAddress,
-    length: GuestUsize,
+pub struct MmioRegion {
+    pub start: GuestAddress,
+    pub length: GuestUsize,
     type_: PciBarRegionType,
     index: u32,
     mem_slot: Option<u32>,
@@ -615,6 +615,10 @@ impl VfioPciDevice {
             .extend_dma_map(new_region)
             .map_err(VfioPciError::UpdateMemory)
     }
+
+    pub fn mmio_regions(&self) -> Vec<MmioRegion> {
+        self.mmio_regions.clone()
+    }
 }
 
 impl Drop for VfioPciDevice {

vmm/src/device_manager.rs

@@ -2539,6 +2539,15 @@ impl DeviceManager {
             })
             .map_err(DeviceManagerError::VfioMapRegion)?;
 
+        let mut node = device_node!(vfio_name);
+
+        for region in vfio_pci_device.mmio_regions() {
+            node.resources.push(Resource::MmioAddressRange {
+                base: region.start.0,
+                size: region.length as u64,
+            });
+        }
+
         let vfio_pci_device = Arc::new(Mutex::new(vfio_pci_device));
 
         self.add_pci_device(
@@ -2549,6 +2558,10 @@ impl DeviceManager {
             pci_device_bdf,
             vfio_name.clone(),
         )?;
+        self.device_tree
+            .lock()
+            .unwrap()
+            .insert(vfio_name.clone(), node);
 
         Ok((pci_device_bdf, vfio_name))
     }