Re: [Xen-ia64-devel] SMP guest and itc

[Alex Williamson <alex.williamson@xxxxxx>]

On Fri, 2006-02-10 at 09:01 +0100, Tristan Gingold wrote:
> Le Jeudi 09 Février 2006 17:59, Alex Williamson a écrit :

> >    I'm not sure I understand c).  Aren't the ITCs already
> > pre-synchronized by xen in smp_callin()?   Thanks,
> Correct, but Linux is not aware of this.
> After more thoughs, I really think this is the best solution.

   Does that imply the Linux kernel will be somewhat paravirtualized
with respect to the ITC (ie. knowing that the ITC is pre-synchronized)?
Ultimately I think we're going to need to fully virtualize the ITC, but
I would guess the pre-sync solution will work for a while.  We are
eventually going to need to run on systems where the ITC may drift
between processors, we could hide that with a fully virtualized ITC.
Thanks,

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab


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