Re: event notification

[ravi kerur <rkerur@gmail.com>]

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Thanks Ian and Konrad. I thought monitoring udev events or xen store watch
can be done from user-level apps. I am wondering can they be used from
kernel modules as well?

Thanks
-RK

On Wed, Mar 10, 2010 at 8:09 AM, Ian Campbell <Ian.Campbell@citrix.com>wrote:

> On Mon, 2010-03-08 at 16:47 +0000, Konrad Rzeszutek Wilk wrote:
> > On Sat, Mar 06, 2010 at 07:12:02PM -0800, ravi kerur wrote:
> > > Hi,
> > >
> > > Is there a mechanism available in Xen such that a kernel module in dom0
> can
> > > register to it and when a VM(domU) is installed or deleted or suspend
> or
> > > resumed kernel module in domU can send notification to its counterpart
> in
> > > dom0. I have looked into xenbus mechanism used by PV drivers and it
> won't
> > > work for us. Inputs appreciated.
> >
> > You can listen on udev events and see when a vif device has been added.
> > Also you can add pieces to the dom0 kernel to send uevents when a device
> > is suspended and do something.
> >
> > Attached is a simple program to listen to all uevents..
>
> Also if you are specifically interested in domain create/destruction
> (from the hypervisors PoV) then I think you can add a xenstore watch on
> "@releaseDomain" and "@introduceDomain".
>
> As far as the hypervisor is concerned things like migration or
> suspend/resume are just domain creation or destruction, the "illusion"
> of anything more is provided by the tools.
>
> If you are interested in the creation/suspension/migration/etc of
> domains at the toolstack level then it depends which toolstack you are
> targeting.
>
>
>

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