From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:34323) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RUiIn-0000Qf-RR for qemu-devel@nongnu.org; Sun, 27 Nov 2011 12:14:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RUiIm-0002RG-PB for qemu-devel@nongnu.org; Sun, 27 Nov 2011 12:14:05 -0500 Received: from mail-yx0-f173.google.com ([209.85.213.173]:39106) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RUiIm-0002Qy-Mj for qemu-devel@nongnu.org; Sun, 27 Nov 2011 12:14:04 -0500 Received: by yenq7 with SMTP id q7so1915541yen.4 for ; Sun, 27 Nov 2011 09:14:03 -0800 (PST) Message-ID: <4ED26FD7.4050209@codemonkey.ws> Date: Sun, 27 Nov 2011 11:13:59 -0600 From: Anthony Liguori MIME-Version: 1.0 References: <20111124160355.7182f296@doriath> <4ED2356E.6070505@redhat.com> In-Reply-To: <4ED2356E.6070505@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: qemu-devel , Luiz Capitulino On 11/27/2011 07:04 AM, Avi Kivity wrote: > On 11/24/2011 08:03 PM, Luiz Capitulino wrote: >> Avi, >> >> I'm getting the following panic very early on boot on a F16 VM (latest >> qemu.git head 40897c9): >> >> [ 0.068018] Kernel panic - not syncing: Boot APIC ID in local APIC unexpected (-1 vs 0) >> [ 0.070006] Pid: 1, comm: swapper Not tainted 3.1.0-7.fc16.x86_64 #1 >> [ 0.071004] Call Trace: >> [ 0.072035] [] panic+0x91/0x1a5 >> [ 0.073027] [] native_smp_prepare_cpus+0x24c/0x300 >> [ 0.075010] [] kernel_init+0x85/0x158 >> [ 0.075993] [] ? schedule_tail+0x27/0x6c >> [ 0.076017] [] kernel_thread_helper+0x4/0x10 >> [ 0.077022] [] ? start_kernel+0x3b6/0x3b6 >> [ 0.078009] [] ? gs_change+0x13/0x13 >> >> After some debugging and I found out that this only happens when '-cpu host' >> is passed, and according to git bisect it's caused by the following commit: >> >> commit 66e3dd9282141b5ae75637c9676002cf3ceeb988 >> Author: Avi Kivity >> Date: Wed Nov 9 15:44:36 2011 +0200 >> >> i386: derive '-cpu host' from KVM_GET_SUPPORTED_CPUID >> > > Strange, since it looks like cpuid 1 (ebx) returns the correct APIC ID. > > Anthony, I think we should revert that commit and refactor cpuid for > 1.1. The logic is spread over too many places which makes it hard to > reason about. Ack. Regards, Anthony Liguori >