From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by 10.25.208.211 with SMTP id h202csp2524670lfg; Wed, 9 Mar 2016 06:21:23 -0800 (PST) X-Received: by 10.140.41.164 with SMTP id z33mr42517042qgz.78.1457533282969; Wed, 09 Mar 2016 06:21:22 -0800 (PST) Return-Path: Received: from lists.gnu.org (lists.gnu.org. [2001:4830:134:3::11]) by mx.google.com with ESMTPS id i6si8088048qhi.95.2016.03.09.06.21.22 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 09 Mar 2016 06:21:22 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Received: from localhost ([::1]:41818 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adezK-0008M7-Fe for alex.bennee@linaro.org; Wed, 09 Mar 2016 09:21:22 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34423) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adezD-0008Lj-57 for qemu-arm@nongnu.org; Wed, 09 Mar 2016 09:21:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1adez8-00089U-2e for qemu-arm@nongnu.org; Wed, 09 Mar 2016 09:21:15 -0500 Received: from mx1.redhat.com ([209.132.183.28]:53202) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adez7-00089Q-TN; Wed, 09 Mar 2016 09:21:10 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 72AD6AA46E; Wed, 9 Mar 2016 14:21:09 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-113-29.phx2.redhat.com [10.3.113.29]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u29EL7Jb018823; Wed, 9 Mar 2016 09:21:07 -0500 To: Paolo Bonzini , Ard Biesheuvel References: <1455288361-30117-1-git-send-email-peter.maydell@linaro.org> <56DD9C58.7050306@redhat.com> <56DEBF6A.6070809@redhat.com> <56DEC234.70907@redhat.com> <56DEC860.1060707@redhat.com> <56DECE5F.6000207@redhat.com> <56E02DCD.5060008@redhat.com> <56E02E1C.2090207@redhat.com> From: Laszlo Ersek Message-ID: <56E03152.9060003@redhat.com> Date: Wed, 9 Mar 2016 15:21:06 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <56E02E1C.2090207@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Peter Maydell , qemu-arm , QEMU Developers , Markus Armbruster , "Michael S. Tsirkin" Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH 0/4] virt: provide secure-only RAM and first flash X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: hRy1FEmgSw42 On 03/09/16 15:07, Paolo Bonzini wrote: > > > On 09/03/2016 15:06, Laszlo Ersek wrote: >> However: despite reusing the core SMM code identically in the guest, >> there is at least one stark behavioral difference: in QEMU the SMI is >> raised only on the processor that triggers it. This exercises paths in >> the core SMM code where processors have to count down timeouts and bring >> each other in, and these busy loops are very visible to an interactive >> user in certain circumstances. > > Right, and that's unfortunately something that's hard to change because > SeaBIOS relies on it. :(( I recall (and am still thankful for) the relevant patch receiving the due attention and investigation on the list, so I'm not bitter about it or anything. Just a bit worried about users asking about the animation :) Laszlo