Re: [Xen-users] para virtualised and full virtualised

[Grok Mogger <linuximp@xxxxxxxxx>]

anant wrote:
> Hi 
> my system is showing as if its para virtualised. I think intel vt isn't
> included but i would like to know can i install windows OperatinG System
> over para virtualised system or its possible only with fully virtualised...I
> am new to linux and xen .Any help would be appreciated... 
> thanks
Hey, I hope this'll help,

1) My understanding is that you can only install Windows as a 
Guest OS if you are running "fully virtualized" Xen software.
2) My understanding about running Xen "fully virtualized" is 
that it requires 3 things.
   i) Your processor must support Virtualization Technology 
(VT) (called "Intel VT" by Intel or "AMDV" by AMD).
   ii) Your BIOS must support VT.  If it does, you'll have some 
options to turn VT on and off from within the BIOS.
   iii) Xen must be compiled to support VT.  I think I recall 
seeing some instructions about how to compile Xen to support 
full virtualization somewhere in the Xen 3.0 manual...
3) I believe you can determine whether or not your processor 
supports Intel VT by going to looking at the text file 
"/proc/cpuinfo".  In that file, you will see a line that starts 
with the word "flags".  The line will most likely also contain a 
list of 3 or 4 letter abbreviations that (to me at least) mostly 
don't make a whole lot of sense.  If you see "vmx" in that list, 
supposedly that means that you have a VT enabled processor.  I 
have read this a few places on the internet, but am a little 
skeptical myself.
If anyone else can confirm or refute what I've written here, 
please do.

Thanks,
- GM

BTW - I saw someone suggest that you might run Windows as a 
Guest OS on a paravirtualized Xen system by actually running a 
paravirtualized *Linux* Guest OS (as you're probably already 
doing), and then using qemu to run Windows from within that 
Linux Guest.  I have not tried this myself and have no idea how 
well it might work.  (I've never even used qemu)

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