vmm: Trigger hotplug notification to the guest

Whenever the user wants to hotplug a new VFIO PCI device, the VMM will
have to trigger a hotplug notification through the GED device.

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

devices/src/lib.rs

@@ -75,5 +75,6 @@ bitflags! {
         const NO_DEVICES_CHANGED = 0;
         const CPU_DEVICES_CHANGED = 0b1;
         const MEMORY_DEVICES_CHANGED = 0b10;
+        const PCI_DEVICES_CHANGED = 0b100;
     }
 }

vmm/src/vm.rs

@@ -547,6 +547,12 @@ impl Vm {
             .add_device(path)
             .map_err(Error::DeviceManager)?;
 
+        self.devices
+            .lock()
+            .unwrap()
+            .notify_hotplug(HotPlugNotificationFlags::PCI_DEVICES_CHANGED)
+            .map_err(Error::DeviceManager)?;
+
         Ok(())
     }