Re: [Xen-devel] Re: [Xen-staging] [xen-unstable] Added some more fields to host_cpu.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 2/3/07 20:55, "Alex Williamson" <alex.williamson@xxxxxx> wrote:

>> We have indeed hit this problem and I put a patch in this afternoon to
>> duplicate cpu0's info for any non-existent cpu. Given that the dom0 cpus
>> could be migrating around on arbitrary physical cpus (even across the
>> multiple CPUID invocations that the kernel will have made to build the
>> information for a single 'cpu' in /proc!) this is fine -- x86 multiprocessor
>> systems are supposed to be symmetric (homogeneous CPUs down to the same
>> stepping in some cases) anyway.
> 
>    Cool, I see it in staging.  This is the approach I used to work
> around the problem temporarily, but what happens if cpu0 is hot
> un-plugged?  ISTR x86 Linux doesn't support cpu0 hotplug, but on ia64 we
> can hotplug cpu0.  I'd guess powerpc could too.  Thanks,

Then picking another number than zero would be a good idea. :-)

 -- Keir



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