Re: [Patch -v4 1/4] Migrate shutdown/reboot to boot cpu.

[Srivatsa S. Bhat]

On 04/19/2013 01:26 PM, Ingo Molnar wrote:
> 
> * Borislav Petkov <bp@xxxxxxxxx> wrote:
> 
>> On Wed, Apr 17, 2013 at 09:46:53AM +0200, Ingo Molnar wrote:
>>
>>> What you mention here should indeed already be handled by the architecture 
>>> hotplug code (for example on x86 the boot CPU cannot be hot-removed).
>>
>> Supposedly, some new Intels (I think Ivybridge or so) can actually be 
>> hot-removed.
> 
> There are WIP patches in existence that remove the limitations on the kernel side, 
> but they are not upstream yet, so currently the constraint exists upstream.
> 

I thought Fenghua Yu's upstream commits were supposed to handle that. Don't they?

a71c8bc x86, topology: Debug CPU0 hotplug
6f5298c x86/i387.c: Initialize thread xstate only on CPU0 only once
8d966a0 x86, hotplug: Handle retrigger irq by the first available CPU
30242aa x86, hotplug: The first online processor saves the MTRR state
27fd185 x86, hotplug: During CPU0 online, enable x2apic, set_numa_node.
e1c467e x86, hotplug: Wake up CPU0 via NMI instead of INIT, SIPI, SIPI
3e2a0cc x86-32, hotplug: Add start_cpu0() entry point to head_32.S
42e78e9 x86-64, hotplug: Add start_cpu0() entry point to head_64.S
6e32d47 kernel/cpu.c: Add comment for priority in cpu_hotplug_pm_callback
209efae x86, hotplug, suspend: Online CPU0 for suspend or hibernate
30106c1 x86, hotplug: Support functions for CPU0 online/offline
4d25031 x86, topology: Don't offline CPU0 if any PIC irq can not be migrated out of it
80aa1df x86, Kconfig: Add config switch for CPU0 hotplug
f78cff4 doc: Add x86 CPU0 online/offline feature
 
Regards,
Srivatsa S. Bhat

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