From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: x86: Exception handling via task gates broken Date: Mon, 22 Mar 2010 14:34:45 +0100 Message-ID: <4BA771F5.5070401@siemens.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit To: kvm Return-path: Received: from thoth.sbs.de ([192.35.17.2]:16176 "EHLO thoth.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752027Ab0CVNes (ORCPT ); Mon, 22 Mar 2010 09:34:48 -0400 Received: from mail1.siemens.de (localhost [127.0.0.1]) by thoth.sbs.de (8.12.11.20060308/8.12.11) with ESMTP id o2MDYklx015200 for ; Mon, 22 Mar 2010 14:34:46 +0100 Received: from [139.25.109.167] (mchn012c.mchp.siemens.de [139.25.109.167] (may be forged)) by mail1.siemens.de (8.12.11.20060308/8.12.11) with ESMTP id o2MDYjQe009285 for ; Mon, 22 Mar 2010 14:34:46 +0100 Sender: kvm-owner@vger.kernel.org List-ID: Hi, when switching an x86 hardware task because of some exception, KVM does not push potential error codes on the stack of the handler task. I guess not many OSes make use of this slow feature - we found one :). Does anyone happen to have a fix on his agenda? Otherwise I will look into this (next week). Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux