[Xen-devel] Re: A simple XenBus Daemon prototype.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29 Apr 2005, at 07:52, Rusty Russell wrote:

> Hi all,
>
>         I've been working on the storage and daemon for maintaining device and
> machine state for Xen.  Based somewhat loosely on designs by Mike Wray
> and Anthony Liguori, as well as comments from Kier Fraser, it is now at
> 0.1 stage.  It's not actually useful yet, however.
Generally looking good. I have one kind of trivial comment, which is 
that calling it 'xenbus daemon' makes no sense. It's a registry daemon, 
or a store daemon, or something like that, but it sure doesn't look 
like a bus to me. :-)
I know there's confusion about what xenbus is actually intended to be. 
The way we've envisaged it in Cambridge is that it is just a convenient 
virtual bus abstraction within each guest OS. For example, Linux will 
have a xenbus driver that reads device state out of the repository 
(perhaps making use of a lower-level repository-access driver), and 
then presents the devices in sysfs and provides a neat interface for 
the specific drivers (blk, net, usb, whatever) to connect to the 
appropriate backend driver domain.
It was never our intention for the concept of a 'xenbus' to leak 
outside individual guest OSes and into the user-space control tools. 
The old xr (xen registry) naming scheme was just fine imo.
 -- Keir


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