RE: [Xen-devel] [PATCH] Fix hvm vcpu hotplug bug

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Ian Jackson wrote:
> Liu, Jinsong writes ("RE: [Xen-devel] [PATCH] Fix hvm vcpu hotplug
> bug"): 
>> Per my understanding, sci-gpe logic is like
>> [diagram]
>> 
>> Currently qemu-xen didn't have 'gep event x OR gpe event y --> sci'
>> logic, it should add this logic level.
> 
> Yes, thanks, I'd understood that.  But:
> 
>> To clear the interrupt:
>> 1). gpe_sts x & gpe_en x --> low gpe event x
> 
> I think you mean "gpe_sts goes low" ?  Since your diagram is in terms
> of levels and I guess "sts" is the actual interrupt source, and
> "sts_en" is the interrupt enable flag.

Yes.

> 
> So in real hardware, what makes gpe_sts go low ?
> 
> Ian.

ospm will do. Its sequence is (i.e. linux 2.6.32, ospm dispatch control method 
case)
1). clear pge_en x by writing '0' to the bit;
2). asynchronic call control method;
3). clear gpe_sts x by writing '1' to the bit;
4). re-enable gpe_en x by writing '1' to the bit;


Thanks,
Jinsong
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