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 09:25:42 -0600 Message-ID: <4221E676.5000008@us.ibm.com> References: <1109451460.32219.11.camel@localhost.localdomain> <68d3daa4e95f4ba6740c6c0ffd3f67b8@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: <68d3daa4e95f4ba6740c6c0ffd3f67b8@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: Rusty Russell , Jeremy Katz , Xen Mailing List List-Id: xen-devel@lists.xenproject.org Keir Fraser wrote: >> For kexec and bare-metal bringup, the PPC64 port uses a fairly >> simple >> header + flattened tree of keyword/value pairs (on PPC64, used to hold >> the Open Firmware tree plus Linux extras). This offers flexibility for >> new virtual devices, etc; I propose that we adopt this format or >> something very similar for Xen, first by putting a pointer into it in >> start_info_t, and then migrate entries across as appropriate. > > > I like the idea of bringing out device discovery, bringup, teardown, > recovery all into its own driver or subsystem -- it seems the obvious > way to go. But I think the 'device tree' should be in the > to-be-designed persistent store, and we publish an interface to allow > guests to peek/poke that store. I think publishing domain-information in an OF-like tree would be great. I think we want the persistent store to be outside the OF-tree though. It would provide a good buffer against ill-written management apps. The way I envision this working is to have a persistent store in user-space on a priviledged domain that exported within it's tree the OF device-tree. This way management app information (the domain's name, an icon associated with it, etc.) would not be stored in the OF tree. If you needed to blow away a portion of the store because of an misbehaving management app you do not lose any of the vital device information. Does PPC64 or rHype provide a mechanism to notify user-space daemons when a value in the tree changes? I think this is a great proposal. Regards, Anthony Liguori > -- 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 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xen-devel > ------------------------------------------------------- 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