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Re: [Xen-devel] event notification

To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Subject: Re: [Xen-devel] event notification
From: ravi kerur <rkerur@xxxxxxxxx>
Date: Wed, 10 Mar 2010 15:20:43 -0800
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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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?


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

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