[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] grant tables and driver handshaking
On Thu, Jun 11, 2015 at 06:32:08AM -0600, Linda wrote: > On 6/11/2015 4:43 AM, Wei Liu wrote: > >On Wed, Jun 10, 2015 at 07:45:15PM -0600, Linda wrote: > >>Hello all, > >> I will be writing a xen front and back-end pair for a 9p transport. I > >>have two areas where I'm still a little more muddled than I'd like to be. > >> Can anyone please recommend a good article on either grant tables or > >> the > >>handshaking between the front and back-end drivers, or both? > >The handshake protocol needs to be designed by you. Generally speaking > >you need to at least advertise the event channel and grant table > >references. You also need to advertise other information that you > >identify as part of the handshake process. > OK. That explains half of my muddle. > > Here's the other half. The wiki article on xenbus taks about the front-end > registering with xenbus, before anything else happens. But in blkback, it > looks like it too has to do some kind of setup with xenbus, too. > Not sure if you still have questions in this area or not. If so please reply and preferable with the specific code snippet you find confusing. > Since the backend is in DOM0, and is around longer than the DOMUs, this > happens first. It's that interaction that I'd like a little more text on. > If it exists. I'm not completely sure what you're referring to. That probably only exists in code. The interaction between backend and frontend is very driver specific. Wei. > > > >There is a wiki page on grant table > > > >http://wiki.xenproject.org/wiki/Grant_Table > Thanks. > > > >Wei. > > > >> I have looked at the code, but could use more verbiage. > >>Thanks. > >> > >>Linda _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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