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