On Sun, 27 Nov 2011 11:13:59 -0600 Anthony Liguori <anth...@codemonkey.ws> wrote:
> 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<a...@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. Anthony, are you going to revert it yourself or do you prefer a patch? I can provide it if needed... > > Regards, > > Anthony Liguori > > > >
