From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([140.186.70.92]:56639)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <edgar.iglesias@gmail.com>) id 1R0WiW-0006zw-GS
	for qemu-devel@nongnu.org; Mon, 05 Sep 2011 06:47:53 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <edgar.iglesias@gmail.com>) id 1R0WiV-0002xi-GH
	for qemu-devel@nongnu.org; Mon, 05 Sep 2011 06:47:52 -0400
Received: from mail-ew0-f45.google.com ([209.85.215.45]:49781)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <edgar.iglesias@gmail.com>) id 1R0WiV-0002xe-AP
	for qemu-devel@nongnu.org; Mon, 05 Sep 2011 06:47:51 -0400
Received: by ewy24 with SMTP id 24so2340135ewy.4
	for <qemu-devel@nongnu.org>; Mon, 05 Sep 2011 03:47:50 -0700 (PDT)
Date: Mon, 5 Sep 2011 12:47:47 +0200
From: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
Message-ID: <20110905104747.GE26890@edde.se.axis.com>
References: <4E5BFF51.9010503@web.de> <4E5C00F0.9070103@redhat.com>
	<CAAu8pHs+thsnWrmvWg45BDVLkiVj682GNpbEMUnCCZ6qnyK+YA@mail.gmail.com>
	<4E5DF096.6070207@redhat.com>
	<CAAu8pHucV2HGqt4tnh+GZ=V-wd0+=u=emODB-MZoqrRCtT5LKA@mail.gmail.com>
	<4E6285BB.2010505@codemonkey.ws>
	<20110905083857.GB26890@edde.se.axis.com>
	<4E648D75.3000303@redhat.com>
	<20110905092205.GC26890@edde.se.axis.com>
	<4E649652.1000404@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4E649652.1000404@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] pc: Clean up PIC-to-APIC IRQ path
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: Avi Kivity <avi@redhat.com>
Cc: Lucas Meneghel Rodrigues <lmr@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, Blue Swirl <blauwirbel@gmail.com>, Jan Kiszka <jan.kiszka@web.de>, Gerd Hoffmann <kraxel@redhat.com>

On Mon, Sep 05, 2011 at 12:28:50PM +0300, Avi Kivity wrote:

... 
> Query is needed when a line is masked internally, or when a device is 
> hot-plugged.
> 
> We can work around masking by caching the level in the device even 
> though the line is masked, and querying the cache when the line is 
> unmasked, but that is artificial, and requires live-migrating the cache 
> (which isn't true state).  We can't work around the hotplug case.

Yup, hotplug messes everything up :) At least if you want to plug into
arbitrary places in the tree.

Cheers