hmp: Print "reserve" property of memory backends with "info memdev"

Let's print the new property.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com> for memory backend and machine core
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Eric Blake <eblake@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210510114328.21835-16-david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/core/machine-hmp-cmds.c

@@ -112,6 +112,10 @@ void hmp_info_memdev(Monitor *mon, const QDict *qdict)
                        m->value->prealloc ? "true" : "false");
         monitor_printf(mon, "  share: %s\n",
                        m->value->share ? "true" : "false");
+        if (m->value->has_reserve) {
+            monitor_printf(mon, "  reserve: %s\n",
+                           m->value->reserve ? "true" : "false");
+        }
         monitor_printf(mon, "  policy: %s\n",
                        HostMemPolicy_str(m->value->policy));
         visit_complete(v, &str);