Re: [Xen-devel] grant tables and driver handshaking

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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

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