Re: [Xen-devel] can't boot dom0

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 6 Oct 2005, at 08:58, Chris Bainbridge wrote:

> > Trying to boot an SMP system with a non-APIC domain0 is a recipe for
> > disaster. We depend an awful lot on domain0 to get interrupt routing
> > correct. If Xen has booted an SMP system, probed IO-APICs and so on,
> > domain0 needs to have the same world view.
> >
> > The 'bug' is really that we don't make it harder for people to shoot
> > themselves in the foot in their configuration. Possibly forcing the
> > APIC options is the way to go, or at least indicate that setting them
> > to N is DANGEROUS.
> In my case "SMP" was just uniprocessor hyperthreading, not really SMP,
> so I expected it to work. It's a non-obvious error that will trip up a
> lot of people, I'd recommend forcing it, or detecting the
> hypervisor/kernel SMP mismatch at boottime and printing a big warning.
From the p.o.v. of much of the platform chipset, HT is equivalent to 
SMP. For interrupt routing, the logical CPUs look like physically 
separate entities requiring an IO-APIC.
Yep, we'll look into hardening those config options.

 -- Keir


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