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 11:59:08 -0600 Message-ID: <42220A6C.5040903@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> <1ad6b47f0eb08a9a0218b83fb5f43865@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: <1ad6b47f0eb08a9a0218b83fb5f43865@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: > A reasonable interface to user-space, but what about when one endpoint > is inside the kernel? I'm also concerned that SysV IPC is usually used > between mutually trusting parties -- this is *not* necessarily the > case between management services and managed domains. We need e.g., > control over event-channel masking to be able to limit management > resources consumed by overzealous or malicious guests. I'm not suggesting we use the SysV interfaces, just the mechanisms (named shared memory, message queues, semaphores). As primatives, this seems like a good place to start. As interfaces, I agree that SysV is not the way to go :-) The persistent store protocol could be implemented on top of these mechanisms. Any primatives would also have to be shared between kernel and userspace (either through common header files or perhaps a kernel interface to userspace for these mechanisms). It's really just about generalizing what's already being used. Regards, Anthony Liguori ------------------------------------------------------- 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