From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jose A. Lopes" Subject: Re: Guest to Host communication Date: Tue, 22 Oct 2013 14:48:57 +0200 Message-ID: <20131022124857.GC4223@google.com> References: <20131022075936.GB4223@google.com> <9AAE0902D5BC7E449B7C8E4E778ABCD013E890@AMSPEX01CL01.citrite.net> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1VYbOQ-0001Fc-0y for xen-devel@lists.xenproject.org; Tue, 22 Oct 2013 12:49:02 +0000 Received: by mail-bk0-f49.google.com with SMTP id w14so1264039bkz.22 for ; Tue, 22 Oct 2013 05:49:00 -0700 (PDT) Content-Disposition: inline In-Reply-To: <9AAE0902D5BC7E449B7C8E4E778ABCD013E890@AMSPEX01CL01.citrite.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Paul Durrant Cc: "xen-devel@lists.xenproject.org" List-Id: xen-devel@lists.xenproject.org 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@lists.xen.org [mailto:xen-devel- > > bounces@lists.xen.org] On Behalf Of Jose A. Lopes > > Sent: 22 October 2013 09:00 > > To: xen-devel@lists.xenproject.org > > 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 bandwi= dth channel then xenstore is probably what you want. > = > Paul -- = Jose Antonio Lopes Ganeti Engineering Google Germany GmbH Dienerstr. 12, 80331, M=FCnchen Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg Gesch=E4ftsf=FChrer: Graham Law, Christine Elizabeth Flores Steuernummer: 48/725/00206 Umsatzsteueridentifikationsnummer: DE813741370