Xen devel - Apr 2006 - RE: [PATCH]Check the values of MAX_VIRT_CPUS and NR_CPUSfor SMP

>From: Tristan Gingold [mailto:Tristan.Gingold@bull.net]
>Sent: 2006年4月21日 15:40
>
>Le Vendredi 21 Avril 2006 09:28, Tian, Kevin a écrit :
>> From: Tristan Gingold [mailto:Tristan.Gingold@bull.net]
>>
>> >Sent: 2006年4月21日 15:26
>> >
>> >> >See how we solve this on x86 near the top of do_boot_cpu()
in
>> >> >arch/x86/smpboot.c. Essentially we allocate extra idle
domains on
>> >> >demand to give us enough idle vcpus for one per physical
cpu.
>> >> >
>> >> >  -- Keir
>> >>
>> >> Yes, that''s the same story on ia64 where we also
allocate idle
>> >> vcpu at do_boot_cpu(). That''s why I''m not
sure the real cause
>> >> for Atsushi''s issue.
>> >
>> >No, we don''t create extra domains.  Therefore it there are
more
>CPUs
>> >than
>> >VCPUs, something goes wrong...
>>
>> Yes, there''s only one idle domain now. However I''m
not sure
>> why something will go wrong when NR_CPUS > MAX_VIRT_CPUS.
>bvt has per VCPU data.  if #VCPU > #MAX_VIRT_CPUS, bvt
>reads/writes beyond the
>bounds!
>
>Tristan.
OK, I see. 

Thanks,
Kevin

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