fix: xen domains memory was wrong

ccnode/xen.py

@@ -26,3 +26,27 @@ class XenHypervisor(LibvirtHypervisor):
             cls._instance = super(XenHypervisor, cls).__new__(cls, *args,
                                                                     **kwargs)
         return cls._instance
+    
+    def get_mem(self):
+        '''
+        '''
+        # real machine memory is the max allocatable size of the Dom0
+        mem = None
+        try:
+            dom0 = self._lvcon_handle.lookupByID(0)
+            data = dom0.info()[1]
+            if data:
+                mem = data
+        except:
+            pass
+        return mem
+    
+    def get_mem_free(self):
+        '''
+        '''
+        return None
+    
+    def get_mem_used(self):
+        '''
+        '''
+        return None