Re: [Xen-devel] [PATCH] Console Daemon

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 3 Aug 2005, at 11:58, Rusty Russell wrote:

>         I have some old code I wrote for the IBM Research Hypervisor which
> implements a console.  I stole that ring buffer code for the xenstore,
> in fact.
>
>         I don't think externally-supplied pages are necessary.  I was thinking
> of writing the page (or pages) into the store immediately (since we
> don't need locks, or to wait for a reply).  I think we want more than
> one page because my boot messages almost hit 8k to the first login
> prompt, and the idea of requiring a console daemon repulses me.
We want an initial console page initialised outside xenbus because we 
want to get console *early*. We don;t trust xenbus/xenstore enough just 
yet to enable them in the wild with no console diagnostics available. 
:-)
We'll add support for multiple consoles and multi-page console buffers 
via the xenbus later on. This is just supposed to be a really simple 
ring buffer of raw console bytes, with the ring page initialised same 
way as the xenstore page.
This only differs from what Robert may be thinking about already in 
that I don;t think we care about muxing multiple consoles onto a single 
ring. We'd just set up multiple ring buffers via xenbus. But that is 
definitely 'phase 2'!
 -- Keir


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