Re: [Xen-devel] RE: [Xen-users] Xen in a 32 way system

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Jun 2006, at 18:00, Petersson, Mats wrote:

> The line you have the BUG in is a VCPUOP_initialize, which ends up in
> .../xen/common/domain.c: do_vcpu_op(), where it does essentially the
> first thing is a check:
>         if ((vcpuid < 0) || (vcpuid >= MAX_VIRT_CPUS))
>                 return -EINVAL;
>
> And I think this check will fail if vcpuid is 32, unless MAX_VIRT_CPUS
> is not the standard value in . RSI is 32 (0x20)
Our smpboot.c in Linux should only try to initialise context for cpus 
in cpu_possible_map. And that map is initialised by querying Xen about 
the state of each VCPU. So it's unclear how you can end up getting this 
crash. Looks like it needs some more tracing added...
 -- Keir


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