From: Luiz Capitulino <lcapitulino@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Avi Kivity <avi@redhat.com>, qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot
Date: Mon, 28 Nov 2011 12:00:47 -0200 [thread overview]
Message-ID: <20111128120047.7e00ef15@doriath> (raw)
In-Reply-To: <4ED26FD7.4050209@codemonkey.ws>
On Sun, 27 Nov 2011 11:13:59 -0600
Anthony Liguori <anthony@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<avi@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
>
> >
>
next prev parent reply other threads:[~2011-11-28 14:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-24 18:03 [Qemu-devel] [BUG 1.0] -cpu host breaks linux guest boot Luiz Capitulino
2011-11-25 14:12 ` Alon Levy
2011-11-25 14:37 ` Luiz Capitulino
2011-11-25 15:44 ` Alon Levy
2011-11-27 13:04 ` Avi Kivity
2011-11-27 17:13 ` Anthony Liguori
2011-11-28 14:00 ` Luiz Capitulino [this message]
2011-11-28 14:11 ` Anthony Liguori
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20111128120047.7e00ef15@doriath \
--to=lcapitulino@redhat.com \
--cc=anthony@codemonkey.ws \
--cc=avi@redhat.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).