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Date: Thu, 21 Nov 2013 16:32:27 +0800
From: Li Guang <lig.fnst@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [PATCH 16/27] acpi: ich9: allow guest to clear SCI
 rised by GPE
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: peter.maydell@linaro.org, aliguori@amazon.com, marcel.a@redhat.com, qemu-devel@nongnu.org, Hu Tao <hutao@cn.fujitsu.com>, stefanb@linux.vnet.ibm.com, mjt@tls.msk.ru, mdroth@linux.vnet.ibm.com, armbru@redhat.com, vasilis.liaskovitis@profitbricks.com, quintela@redhat.com, kraxel@redhat.com, stefanha@redhat.com, Igor Mammedov <imammedo@redhat.com>, pbonzini@redhat.com, lcapitulino@redhat.com, chegu_vinod@hp.com, afaerber@suse.de

Michael S. Tsirkin wrote:
> On Thu, Nov 21, 2013 at 04:18:45PM +0800, Li Guang wrote:
>    
>> Hu Tao wrote:
>>      
>>> On Thu, Nov 21, 2013 at 09:14:18AM +0200, Michael S. Tsirkin wrote:
>>>        
>>>> On Thu, Nov 21, 2013 at 03:38:37AM +0100, Igor Mammedov wrote:
>>>>          
>>>>> it fixes IRQ storm since guest isn't able to lower SCI IRQ
>>>>> after it has been handled when it clears GPE event.
>>>>>
>>>>> Signed-off-by: Igor Mammedov<imammedo@redhat.com>
>>>>>            
>>>> The storm is only on memory hotplug right?
>>>>          
>>> IIRC, it happens on cpu hotplug, too.
>>>
>>>
>>>
>>>        
>> :-), that made remember EC implementation,
>> with EC, SCI will be safer, I think.
>>      
> Hmm you are saying let's use EC for memory hotplug?
>
>
>    
It can be a bridge between guest and QEMU,
with it, we may don't have to bother ASL writing
and south-bridge hardware related work(or very
little) if we implement EC correctly.