See posts on SilentMing's Gensokyo. Most of them are written in Chinese, while you can leave comments or send me emails in English or Janpanese as well.
Xen_Log_2- Build HVM Domain: Xen Config filesXen_Log_3- Add New Hypercall to Xen: Kernel module codeXen_Log_8- Grant Table: sharing memory between domU and dom0 using grant tableXen_Log_9- I/O Ring: Using xen io ring struct to communicateXen_Log_12- Event Channel: Using Event Channel in GuestXen_Log_13- XenStore: kernel module read/write info from/to xenstoreXen_Log_14- PV Driver: Simplest split driverXen_Log_15- XenBus: Add xenbus state to PV Driver- others - Other examples in posts, self-descripted by dir name