From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:44370) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q9cq4-0008QU-0b for qemu-devel@nongnu.org; Tue, 12 Apr 2011 08:37:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q9cq2-00052j-N4 for qemu-devel@nongnu.org; Tue, 12 Apr 2011 08:36:59 -0400 Received: from fmmailgate01.web.de ([217.72.192.221]:36258) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q9cq2-00052S-De for qemu-devel@nongnu.org; Tue, 12 Apr 2011 08:36:58 -0400 Message-ID: <4DA44765.8090804@siemens.com> Date: Tue, 12 Apr 2011 14:36:53 +0200 From: Jan Kiszka MIME-Version: 1.0 References: <1302460123-25704-1-git-send-email-weil@mail.berlios.de> <1302460123-25704-5-git-send-email-weil@mail.berlios.de> <4DA2AF8F.4000308@redhat.com> <4DA3387C.3060406@mail.berlios.de> In-Reply-To: <4DA3387C.3060406@mail.berlios.de> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: jan.kiszka@siemens.com Subject: Re: [Qemu-devel] [PATCH 4/4] qemu-timer: Fix timers for w32 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Weil Cc: Paolo Bonzini , Anthony Liguori , QEMU Developers On 2011-04-11 19:21, Stefan Weil wrote: > Am 11.04.2011 09:36, schrieb Paolo Bonzini: >> On 04/10/2011 08:28 PM, Stefan Weil wrote: >>> Commit 68c23e5520e8286d79d96ab47c0ea722ceb75041 removed the >>> multimedia timer, but this timer is needed for certain >>> Linux kernels. Otherwise Linux boot stops with this error: >>> >>> MP-BIOS bug: 8254 timer not connected to IO-APIC >>> >>> So the multimedia timer is added again here. >> >> Which distribution and Windows version is that? Also, have they tried >> the non-dynticks timer (win32)? >> >> Paolo > > The bug was reported for a tinycore 3.5.1 guest (linux kernel 3.6.33-3). > The iso image is available from > http://distro.ibiblio.org/tinycorelinux/3.x/release/. > QEMU was running on XP SP3. > > Other Linux live CD-ROMs (e.g. FC14) were reported to show the same bug > when run as guest. > > APIC can be disabled (kernel parameter), without APIC there is no problem. > > I see the same bug here with two XP hosts and also tried both timer > variants > of current QEMU (without a difference). > > I don't get the bug when running on a Linux host using wine. Passing no_timer_check to the Linux guest should work around the issue as well. But this feature is only available since 2.6.20 (excluding popular legacy 2.6.16 kernels). Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux