From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:41278)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <imammedo@redhat.com>) id 1VjUAo-0005Yu-7K
	for qemu-devel@nongnu.org; Thu, 21 Nov 2013 08:20:02 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <imammedo@redhat.com>) id 1VjUAh-00012A-5m
	for qemu-devel@nongnu.org; Thu, 21 Nov 2013 08:19:58 -0500
Received: from mx1.redhat.com ([209.132.183.28]:1065)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <imammedo@redhat.com>) id 1VjUAg-00011x-Su
	for qemu-devel@nongnu.org; Thu, 21 Nov 2013 08:19:51 -0500
Date: Thu, 21 Nov 2013 14:19:18 +0100
From: Igor Mammedov <imammedo@redhat.com>
Message-ID: <20131121141918.69848186@nial.usersys.redhat.com>
In-Reply-To: <528DC51B.3000302@cn.fujitsu.com>
References: <1385001528-12003-1-git-send-email-imammedo@redhat.com>
	<1385001528-12003-17-git-send-email-imammedo@redhat.com>
	<20131121071418.GB19703@redhat.com>
	<20131121081222.GG24886@G08FNSTD100614.fnst.cn.fujitsu.com>
	<528DC1E5.8090408@cn.fujitsu.com>
	<20131121082909.GB20073@redhat.com>
	<528DC51B.3000302@cn.fujitsu.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH 16/27] acpi: ich9: allow guest to clear SCI
 rised by GPE
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Li Guang <lig.fnst@cn.fujitsu.com>
Cc: peter.maydell@linaro.org, aliguori@amazon.com, stefanb@linux.vnet.ibm.com, qemu-devel@nongnu.org, Hu Tao <hutao@cn.fujitsu.com>, "Michael S. Tsirkin" <mst@redhat.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, pbonzini@redhat.com, marcel.a@redhat.com, lcapitulino@redhat.com, chegu_vinod@hp.com, afaerber@suse.de

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