Xen users - Jul 2006 - How to determine if executing under Xen

Hello,
 
I apologize if this has been asked before.  I searched but could not find a
similar question.
 
 
I am writing a device driver targeted for Linux 2.6.16 running under Xen 3.0. 
Is there an easy mechanism for my code to determine if Linux is running as a Xen
domain rather than natively?  I want to behave slightly differently in each
case.
Thanks - Martin
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Hi,
If its Dom0
You can check if xend is runnning.If so its running on

Xen.
Thanks,
Dakshina

--- mjfeeney@hotmail.com wrote:
> Hello,
>  
> I apologize if this has been asked before.  I
> searched but could not find a similar question.
>  
>  
> I am writing a device driver targeted for Linux
> 2.6.16 running under Xen 3.0.  Is there an easy
> mechanism for my code to determine if Linux is
> running as a Xen domain rather than natively?  I
> want to behave slightly differently in each case.
> Thanks - Martin
>
_________________________________________________________________
> Try Live.com: where your online world comes together
> - with news, sports, weather, and much more.
> http://www.live.com/getstarted>
_______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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On 7/27/06, mjfeeney@hotmail.com <mjfeeney@hotmail.com>
wrote:
>
> Hello,
>
>  I apologize if this has been asked before.  I searched but could not find
a
> similar question.
>
>  I am writing a device driver targeted for Linux 2.6.16 running under Xen
> 3.0.
If this is the target, why worry about scenarios when the driver is no
running on xen?
> Is there an easy mechanism for my code to determine if Linux is
> running as a Xen domain rather than natively?  I want to behave slightly
> differently in each case.
Sounds like a xen developer question.

I am not kernel hacker enough to know how a kernel module can find
which other modules are active. If there''s a way, I''d just
check for
the xen specific modules. For example, the xen kernel is running on a
specific subarchitecture of i386, if you can find that, you are on a
xen kernel.

Henning

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Henning Sprang schrieb:
> On 7/27/06, mjfeeney@hotmail.com <mjfeeney@hotmail.com> wrote:
>>
>> Hello,
>>
>>  I apologize if this has been asked before.  I searched but could not 
>> find a
>> similar question.
>>
>>  I am writing a device driver targeted for Linux 2.6.16 running under
Xen
>> 3.0.
> 
> If this is the target, why worry about scenarios when the driver is no
> running on xen?
> 
>> Is there an easy mechanism for my code to determine if Linux is
>> running as a Xen domain rather than natively?  I want to behave
slightly
>> differently in each case.
> 
> Sounds like a xen developer question.
> 
> I am not kernel hacker enough to know how a kernel module can find
> which other modules are active. If there''s a way, I''d
just check for
> the xen specific modules. For example, the xen kernel is running on a
> specific subarchitecture of i386, if you can find that, you are on a
> xen kernel.
have a look a the Xen Demo-CD. Some time ago I had a look at all the 
scripts hacked in to it to do all kinds of magic stuff (like 
auto-starting vncviewer and so on. I remember stumbling across several 
places whith checks if the instance is runnnig as guest or dom0.

Bye,
Andrej

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