From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: event notification Date: Thu, 11 Mar 2010 07:43:00 +0000 Message-ID: <1268293380.11261.53.camel@localhost.localdomain> References: <20100308164727.GA4568@phenom.dumpdata.com> <1268237356.11737.70451.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: ravi kerur Cc: "xen-devel@lists.xensource.com" , Konrad Rzeszutek Wilk List-Id: xen-devel@lists.xenproject.org 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. Ian. > > Thanks > -RK > > On Wed, Mar 10, 2010 at 8:09 AM, Ian Campbell > 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. > > >