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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: |
Mon, 28 Nov 2011 12:00:47 -0200 |
On Sun, 27 Nov 2011 11:13:59 -0600
Anthony Liguori <address@hidden> 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<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.
>
> Ack.
Anthony, are you going to revert it yourself or do you prefer a patch?
I can provide it if needed...
>
> Regards,
>
> Anthony Liguori
>
> >
>