From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Proposal for init/kexec/hotplug format for Xen Date: Sun, 27 Feb 2005 16:39:57 -0600 Message-ID: <42224C3D.1060208@us.ibm.com> References: <1109451460.32219.11.camel@localhost.localdomain> <68d3daa4e95f4ba6740c6c0ffd3f67b8@cl.cam.ac.uk> <4221E676.5000008@us.ibm.com> <4221ED32.2010407@us.ibm.com> <260c30236e5ef2b632b85e5ebaebcb6b@cl.cam.ac.uk> <4221F26B.2030306@us.ibm.com> <1109521867.4385.22.camel@localhost> <4221F87D.2040809@us.ibm.com> <1109527920.9623.57.camel@localhost> <4222107A.1010902@us.ibm.com> <1109530501.9623.75.camel@localhost> <42221B2F.9000501@us.ibm.com> <96a398aef9c9276a0f9861dd3c9d2aa2@cl.cam.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <96a398aef9c9276a0f9861dd3c9d2aa2@cl.cam.ac.uk> Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Keir Fraser Cc: Harry Butterworth , Rusty Russell , Jeremy Katz , Xen Mailing List List-Id: xen-devel@lists.xenproject.org Keir Fraser wrote: >> What I'm thinking about right now is how to assign out ports for >> notification. It's somewhat non-trivial to figure out the best way >> to manage that. Any thoughts? > > > The difficulty may be that, in the case of normal SysV IPC you have a > common OS instance to manage shmem namespaces and semaphores and so > on. For IDC over Xen you do not have this luxury, unless you modify > Xen, or you are building over higher-level communication primitives > (which perhaps defeats the purpose). This is what makes the OF directory structure so interesting. The per-domain OF structure could be used as an IDC namespace. This requires no additional modification to Xen (other than what the OF structure would). Another approach would be to have a common, well-known shared memory location for storing namespace info for each domain. That's a bit hairy though. I agree that we don't want to modify Xen in order to implement higher-level communications mechanisms. Regards, > -- Keir > > ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click