Re: [Xen-devel] how to check for already existing hypervisor?

[Tim Deegan <tim@xxxxxxx>]

At 02:44 +0200 on 21 Jun (1340246688), palutke.ralph@xxxxxx wrote:
> Hi guys, 
> 
> let me shortly introduce myself. I'm a student and recently work on my 
> bachelor thesis. My goal is to write a little hypervisor.
> I'm not quite sure if this is the right mailing list, but i guess you'll 
> gonna tell me.
> i have two quick questions:
> 
> 1. before i can use the vmxon instruction i do have to set vmxe flag in cr4 
> register. but what if some hypervisor is already running? is there a way to 
> check 
> if one is running??

A lot of hypervisors report their presence in CPUID leaves - have a look
at xen-detect in the tools/ directory for how to spot Xen. 


Tim.

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