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Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot
From: |
Alon Levy |
Subject: |
Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot |
Date: |
Fri, 25 Nov 2011 16:12:37 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Nov 24, 2011 at 04:03:55PM -0200, Luiz Capitulino wrote:
> Avi,
>
I have the same panic and the same bisection result. It doesn't happen
with recent (3.2.0 rc1 and rc3) kernels.
> 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 <address@hidden>
> Date: Wed Nov 9 15:44:36 2011 +0200
>
> i386: derive '-cpu host' from KVM_GET_SUPPORTED_CPUID
>
> Not sure if this is important, but here's procinfo information about
> one of my host's cpus:
>
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 23
> model name : Intel(R) Core(TM)2 Duo CPU T9600 @ 2.80GHz
> stepping : 6
> cpu MHz : 2801.000
> cache size : 6144 KB
> physical id : 0
> siblings : 2
> core id : 0
> cpu cores : 2
> apicid : 0
> initial apicid : 0
> fpu : yes
> fpu_exception : yes
> cpuid level : 10
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor
> ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm tpr_shadow vnmi
> flexpriority
> bogomips : 5585.87
> clflush size : 64
> cache_alignment : 64
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>