From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>,
Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot
Date: Sun, 27 Nov 2011 11:13:59 -0600 [thread overview]
Message-ID: <4ED26FD7.4050209@codemonkey.ws> (raw)
In-Reply-To: <4ED2356E.6070505@redhat.com>
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] [<ffffffff814acb8e>] panic+0x91/0x1a5
>> [ 0.073027] [<ffffffff81b831ca>] native_smp_prepare_cpus+0x24c/0x300
>> [ 0.075010] [<ffffffff81b76c0d>] kernel_init+0x85/0x158
>> [ 0.075993] [<ffffffff810527eb>] ? schedule_tail+0x27/0x6c
>> [ 0.076017] [<ffffffff814be5f4>] kernel_thread_helper+0x4/0x10
>> [ 0.077022] [<ffffffff81b76b88>] ? start_kernel+0x3b6/0x3b6
>> [ 0.078009] [<ffffffff814be5f0>] ? 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<avi@redhat.com>
>> 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
>
next prev parent reply other threads:[~2011-11-27 17:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-24 18:03 [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot Luiz Capitulino
2011-11-25 14:12 ` Alon Levy
2011-11-25 14:37 ` Luiz Capitulino
2011-11-25 15:44 ` Alon Levy
2011-11-27 13:04 ` Avi Kivity
2011-11-27 17:13 ` Anthony Liguori [this message]
2011-11-28 14:00 ` Luiz Capitulino
2011-11-28 14:11 ` Anthony Liguori
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