vmm: Update memory through DeviceManager

Whenever the VM memory is resized, DeviceManager needs to be notified
so that it can subsequently notify each virtio devices about it.

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

vmm/src/vm.rs

@@ -553,6 +553,12 @@ impl Vm {
                 .resize(desired_memory)
                 .map_err(Error::MemoryManager)?
             {
+                self.device_manager
+                    .lock()
+                    .unwrap()
+                    .update_memory()
+                    .map_err(Error::DeviceManager)?;
+
                 self.device_manager
                     .lock()
                     .unwrap()