Re: [Qemu-devel] [PATCH 16/27] acpi: ich9: allow guest to clear SCI rised by GPE

[Michael S. Tsirkin]

On Thu, Nov 21, 2013 at 04:32:27PM +0800, Li Guang wrote:
> 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<address@hidden>
> >>>>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.
> 
> 


I'd like to see that. Can you write a document (just text)
for an imaginary EC support for memory hotplug?