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

[Igor Mammedov]

On Thu, 21 Nov 2013 16:32:27 +0800
Li Guang <address@hidden> 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.
> 
Wouldn't it require guest driver though?
Beauty of ASL/GPE it's that it supported by Windows and Linux
out of box.