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



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.

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.

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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