Re: [PATCH -mm] kexec jump -v9

["Huang, Ying" <ying.huang@intel.com>]

On Tue, 2008-05-27 at 18:15 -0400, Vivek Goyal wrote:
[...]
> > But, because IOAPIC may need to be in original state during
> > suspend/resume, so it is not appropriate to call disable_IO_APIC() in
> > ioapic_suspend(). So I think we can call disable_IO_APIC() in new
> > hibernation/restore callback.
> 
> My hunch is suspend/resume will still work if we put this call in
> ioapic_suspend() but I would not recommend that. suspend/resume does
> not need to put IOAPIC in legacy mode.
>   
> I am not sure what is "new hibernation/restore callback"? Are you
> referring to new patches from Rafel?

Yes. Rafel has a new patch to separate suspend and hibernation device
call backs.
http://kerneltrap.org/Linux/Separating_Suspend_and_Hibernation

> I think this issue is specifc to kexec and kjump so probably we should
> not tweaking any suspend/resume related bit.
> 
> How about calling disable_IO_APIC() in kexec_jump()? We can probably even
> optimize it by calling it only when we are transitioning into new image
> for the first time and not for subsquent transitions (by keeping some kind of
> count in kimage). This is little hackish but, should work...

Yes. This issue is kexec/kjump specific. We can call it in kexec_jump().
Maybe we also need call something other in native_machine_shutdown()?

BTW: I have a new version -v10: http://lkml.org/lkml/2008/5/22/106, do
you have time to review it?

Best Regards,
Huang Ying

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