On Fri, 2007-01-12 at 19:41 -0500, Amos Waterland wrote:
> On Fri, Jan 12, 2007 at 05:45:03PM -0600, Hollis Blanchard wrote:
> > We seem to have an IPI problem, which causes vcpu_pause() to hang the
> > system. The following patch, tested on JS20 and JS21, illustrates it.
> > Before dom0 starts, IPIs work fine. After Linux's mpic_init(), IPIs (as
> > triggered by the 'I' keyhandler) lock the machine. Actually, it looks
> > like a message is trying to get out, because after a while we see a '('
> > emitted (presumably the first character in "(XEN)").
> 
> No, this is almost certainly our code that checks that the IPI start is
> acked.  If you run with `sync_console' you should see periodic messages
> about start stalls.
> 
> > (When I comment out mpic_init() in dom0, Xen IPIs continue to work but
> > real IRQs (e.g. the IDE controller) fail in dom0.)
> 
> Make sure you did not merge this out:
> 
>  http://lists.xensource.com/archives/html/xen-ppc-devel/2006-11/msg00149.html

Hmmm. I had never pulled this (Linux) changeset. However, now that I
have, it doesn't seem to be helping.

-- 
Hollis Blanchard
IBM Linux Technology Center


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