Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate fails, domU BUG

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 11/25/09 12:03, Ian Campbell wrote:
>> Yep.  I wonder how it ever worked?  There's been a fair amount of change
>> in the PM code, so that could have changed things.  I don't know if
>> there's a deep reason for not calling tick_resume() on all processors.
>>
>> Rafael, tglx: suspend/resume under Xen doesn't need to hot unplug all
>> the CPUs, so we don't; the hypervisor can manage the context
>> save/restore for all CPUs.  Is there a deep reason why
>> timekeeping_resume() can't call the CLOCK_EVT_NOTIFY_RESUME notifier on
>> all online CPUs?
>>     
> Interrupts are disabled at that point where it currently calls the
> notifier, so none of the SMP function call primitives work.
>   

That does make it pretty awkward.


    J

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