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SubjectRe: nonboot cpu on SMP suspend
From
On Thu, Mar 19, 2009 at 3:04 PM, chen gong <gong.chen@linux.intel.com> wrote:
> Rafael J. Wysocki 写道:
>>
>> On Wednesday 18 March 2009, Li Yang wrote:
>>>
>>> Hi all,
>>>
>>> I'm curious why we need to un-plug all the nonboot cpus before suspend
>>> and start them all over again after the suspend(ACPI sleep)?  I mean
>>> if we can bring the booting cpu back to the exact state as before
>>> suspend, why can't we just do the same for non-booting cpus?  And that
>>> will be much faster.  Any thought?  Thanks.
>>
>> Because we need to enter the BIOS with one CPU on-line only.
>>
> You mean only one CPU can be supported by BIOS when suspend/resume ?

If so, is it a defect of x86 BIOS? And is it true that for other
architectures without a BIOS there won't be such a limitation if the
boot code is sane? Thanks

- Leo
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