Xen users - May 2009 - xen-detect.c question

Hello, I have a question about xen-detect.c (which is posted
http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.htmlhere)

It says that by running this program xen PV and HVM can be detected.

First of all, is it true that it can detect HVM (hardware support Xen)?
Can anyone confirm this?

If it is true then can anyone explain me how this can detect xen?

Thank you in advance.


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Well, I''m not sure about the internals of Xen, but I can read C. It 
looks like it should be able to detect HVM and PV.

What it does is:

Executes some assembly code to get the id of the cpu

If that returns "XenVMMXenVMM" then we''re running Xen in HVM
mode

Otherwise it tests for PV mode.

It executes the same assembly code, but this time in pv context (which 
will only work on a PV machine)

If that succeeds then we''re running Xen in PV mode.

If that fails then we''re not running Xen.

Jeff

On 26/05/09 11:51, 정희동 wrote:
> Hello, I have a question about xen-detect.c (which is posted 
>
http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.html
> here)
>  
> It says that by running this program xen PV and HVM can be detected.
>  
> First of all, is it true that it can detect HVM (hardware support Xen)?
> Can anyone confirm this?
>  
> If it is true then can anyone explain me how this can detect xen?
>  
> Thank you in advance.
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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Thank you very much.

You helped me a lot =)

2009/5/26 Jeff Williams <jeffw@globaldial.com>
> Well, I''m not sure about the internals of Xen, but I can read C.
It looks
> like it should be able to detect HVM and PV.
>
> What it does is:
>
> Executes some assembly code to get the id of the cpu
>
> If that returns "XenVMMXenVMM" then we''re running Xen in
HVM mode
>
> Otherwise it tests for PV mode.
>
> It executes the same assembly code, but this time in pv context (which will
> only work on a PV machine)
>
> If that succeeds then we''re running Xen in PV mode.
>
> If that fails then we''re not running Xen.
>
> Jeff
>
>
> On 26/05/09 11:51, 정희동 wrote:
>
>>  Hello, I have a question about xen-detect.c (which is posted
>>
http://lists.xensource.com/archives/html/xen-changelog/2007-02/msg00075.htmlhere)
>>  It says that by running this program xen PV and HVM can be detected.
>>  First of all, is it true that it can detect HVM (hardware support
Xen)?
>> Can anyone confirm this?
>>  If it is true then can anyone explain me how this can detect xen?
>>  Thank you in advance.
>>
------------------------------------------------------------------------
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
>
>

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