Re: [Xen-API] Configuration options from the hypervisor?

[Cutter 409 <cutter409@xxxxxxxxx>]

I'm making modifications to the hypervisor itself, which needs to be aware of a few things about each VM it's managing.

For example, I want the hypervisor to know if the guest is Windows XP, Vista, 2000, etc. 
Somehow I'd like to store this information with the VM once, when configuring it, and be able to read it each time the VM is launched from the hypervisor.

Xapi provides the ability to store arbitrary configuration data via the "other_config" section, which in python is " session.xenapi.VM.add_to_other_config() ",
but I'm starting to think that information stored there is not readable by the hypervisor.

Hope that clarifies, and thanks!

On Tue, Nov 16, 2010 at 11:50 AM, Magnus Therning <magnus.therning@xxxxxxxxxx> wrote:

On Tue, Nov 16, 2010 at 03:30:48PM +0000, Cutter 409 wrote:
> Thanks, but I'm actually referring to per VM configuration data. I'm trying
> to get some custom configuration strings passed to the hypervisor when a VM
> starts.
>
> I was hoping that somehow I could read the other_config section from the
> hypervisor, but maybe it's only possible to pass data after starting the
> guest with an event channel?

I don't quite understand what you are asking about, unless by "hypervisor" you
actually mean Xapi :-)

Maybe it would be easier for me to understand if you tell us what you would
like to do more specifically?

Cheers,
M

> On Tue, Nov 16, 2010 at 3:00 AM, Magnus Therning <magnus.therning@xxxxxxxxxx<mailto:magnus.therning@xxxxxxxxxx>> wrote:
> On Mon, Nov 15, 2010 at 09:33:26PM +0000, Cutter 409 wrote:
> > Hello,
> >
> > I'm trying to pass configuration options to the hypervisor.
> >
> > It seems like each VM has an "other_config" section that I should be able to
> > add options to, but I can't seem to figure out how to read them from the
> > hypervisor.
> > In userland I can set the options using " session.xenapi.VM.add_to_
> > other_config(  ) " (In Python) but is there any way to retreive it from the
> > hypervisor?
> >
> > If not, is there another mechanism where I can store additional
> > configuration data?
>
> Arguments for the hypervisor are passed by the boot loader.  Take a look at
> /boot/extlinux.conf.
>
> Cheers,
> M
>
> --
> Magnus Therning

> magnus.therning@xxxxxxxxxxxxx<mailto:magnus.therning@xxxxxxxxxxxxx>          Jabber: magnusth@eng

>
> There does not now, nor will there ever, exist a programming language
> in which it is the least bit hard to write bad programs.
>     -- Flon's Axiom
>
>
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--

Magnus Therning
magnus.therning@xxxxxxxxxxxxx          Jabber: magnusth@eng

There does not now, nor will there ever, exist a programming language
in which it is the least bit hard to write bad programs.
    -- Flon's Axiom


Perl is another example of filling a tiny, short-term need, and then
being a real problem in the longer term.
    -- Alan Kay

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