Re: [Xen-devel] Guest to Host communication

["Jose A. Lopes" <jabolopes@xxxxxxxxxx>]

Hi,

If I understood correctly, Xenstore requires writing a driver and
loading it inside the VM.  Is this correct?

If so, then it seems this approach would require writing different
drivers for different OSes, such as, Linux and Windows.  Currently, we
are just exploring different design options and we would like to aim
at a uniform approach across different OSes. Is there an option like that ?

Thank you,
Jose

On Tue, Oct 22, 2013 at 08:48:24AM +0000, Paul Durrant wrote:
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> > bounces@xxxxxxxxxxxxx] On Behalf Of Jose A. Lopes
> > Sent: 22 October 2013 09:00
> > To: xen-devel@xxxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-devel] Guest to Host communication
> > 
> > Hi,
> > 
> > My name is Jose and I work at Google on the Ganeti project.
> > I am using Xen 4.0.
> > 
> > I would like to ask your advice on what you think is the best way to
> > send data between the guest and the host, for example, the guest OS
> > tells Ganeti that it wants to be reinstalled at reboot time.  Even a
> > simple integer suffices for our purposes.
> > 
> > We have considered adding a new device, such as, a char/block device.
> > For example, we could add an SSD device that is backed by a file.  We
> > have also considered a separate console.
> > 
> > What do you think is the preferred approach to this problem?
> > 
> 
> If you're talking about a small amount of data and only need a low bandwidth 
> channel then xenstore is probably what you want.
> 
>   Paul

-- 
Jose Antonio Lopes
Ganeti Engineering
Google Germany GmbH
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