Xen users - Oct 2005 - Docs Explaining internals of Xen from programming perspective

hi,
             Does anyone know of any document which explains internals of xen
(typically about creation of domains  from perspective of process creation and
system programming)?
 The aim is to call xen api''s in a program  to automate the process of
creation/shutdown/migration   of domains.

Thanks and Regards,
Amit Kumar


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On 25 Oct 2005 12:11:51 -0000, AMIT KUMAR <amitkpce@rediffmail.com>
wrote:
>
> hi,
> Does anyone know of any document which explains internals of xen
> (typically about creation of domains from perspective of process creation
> and system programming)?
> The aim is to call xen api's in a program to automate the process of
> creation/shutdown/migration of domains.
>
The xen APIs for domain creation are rather too low level for what you want
(see xc_linux_build.c). You're better off writing wrappers around the tools.
At some point when things have stabilized I think you'll be able to get the
desired effect by sending updates to the store.

As for a more polished API, you have to think about its academic value (or
lack thereof), and where the companies driving xen are getting their
differentiating value -add from.

-Kip


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on Tue, Oct 25, 2005 at 12:11:51PM -0000, AMIT  KUMAR (amitkpce@rediffmail.com)
wrote:
>   hi,
>  Does anyone know of any document which explains internals of xen
>  (typically about creation of domains  from perspective of process
>  creation and system programming)? 
> 
>  The aim is to call xen api''s in a program  to automate the
process of
>  creation/shutdown/migration   of domains.
Perhaps the Xen Interface Manual?  Covers Xen 2.0, 3.x is a work in
progress.

    http://www.xensource.com/files/xen_interface.pdf

You''re probably going to be most interested in Appendix A, "Xen
Hypercalls", particularly A.8, Inter-Domain Communication.


Cheers.

-- 
Karsten M. Self <karsten@xensource.com>
XenSource, Inc.
2300 Geng Road #250                                +1 650.798.5900 x259
Palo Alto, CA 94303                                +1 650.493.1579 fax

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> on Tue, Oct 25, 2005 at 12:11:51PM -0000, AMIT KUMAR 
> (amitkpce@rediffmail.com) wrote:
>>   hi,
>>  Does anyone know of any document which explains internals of xen
>>  (typically about creation of domains  from perspective of process
>>  creation and system programming)? 
>> 
>>  The aim is to call xen api''s in a program  to automate the
process of
>>  creation/shutdown/migration   of domains.
You''ll probably want to call into some of the tools; the backend
libraries
of the xm tool are likely to be best. If you these instead of the lowlevel 
Xen APIs you get a lot more work done for you. Alternatively, you can talk 
the Xend management protocol directly, either over a Unix domain socket or 
a TCP connection.

Of course there is also the quote that came up last week "the roads are the
best map", i.e. the source code generally is the most up-to-date reference 
;-)
>Perhaps the Xen Interface Manual?  Covers Xen 2.0, 3.x is a work in
>progress.
>
>    http://www.xensource.com/files/xen_interface.pdf
>
>You''re probably going to be most interested in Appendix A,
"Xen
>Hypercalls", particularly A.8, Inter-Domain Communication.
We''re actively looking at getting the interface documentation into a
good
state - ideally in time for around 3.0 (at which point the interface will 
be stable and supported for the foreseeable future). Stay tuned folks ;-)

Cheers,
Mark
>
>
>Cheers.
>
>
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