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

[Avi Kivity]

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 <address@hidden>
> 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.

-- 
error compiling committee.c: too many arguments to function