Hi, lists, Now I dive the sea of xen, I took a Dell 2950 Server, install FC 6 i386 on it, I refer some documents about Xen: http://www.fedoraproject.org/wiki/FedoraXenQuickstartFC6 So i checked as following: 1. check Intel VM for host CPU, it works, it showed me: flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pni monitor ds_cpl vmx tm2 cx16 xtpr lahf_lm 2. check hvm-??, then I have no luck. even I enable virtualization in BIOS. so how could I enable fully-virtualizied in this server? or should I install x86_64 for it? Because this server CPU is Intel Xeon Core 5130 serial. Thanks a lot, Zhou Zhen