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Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot
From: |
Luiz Capitulino |
Subject: |
Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot |
Date: |
Fri, 25 Nov 2011 12:37:04 -0200 |
On Fri, 25 Nov 2011 16:12:37 +0200
Alon Levy <address@hidden> wrote:
> 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.
Would be nice to test a recent kernel with 66e3dd9 reverted. It'll be funny
if it fails :)
>
> > 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:
> >
>