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