Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot

[Luiz Capitulino]

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:
> > 
>