On Thu, Mar 11, 2010 at 07:43:00AM +0000, Ian Campbell wrote:
> On Wed, 2010-03-10 at 23:20 +0000, ravi kerur wrote:
> > 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?
>
> xenstore can. I don't think udev can.
<nods>
Of interest might be git commit dfecff0a8934996f381cb5a80c7220ad87830ae9
"commit dfecff0a8934996f381cb5a80c7220ad87830ae9
Author: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Thu Nov 5 15:25:40 2009 -0500
xenbus_walk - walk XenStore keys, calling callback.
This is quite similar to 'pci_walk_bus.' We walk the
XenStore keys, starting at the initial path, calling the
callback with each key that has a value. If the callback
returns a negative value we stop, clean up, and return the
value back.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
"
which you could use to get more details of your XenStore values.
(this commit is in Jeremy's Xen tree
git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git)
>
> Ian.
>
> >
> > Thanks
> > -RK
> >
> > 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
> > targeting.
> >
> >
> >
>
>
>
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