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Re: [Qemu-devel] Re: Breakage with local APIC routing

From: Juergen Lock
Subject: Re: [Qemu-devel] Re: Breakage with local APIC routing
Date: Thu, 27 Aug 2009 00:10:01 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

On Tue, Aug 25, 2009 at 12:38:04PM +0200, Jan Kiszka wrote:
> Mohammed Gamal wrote:
> > On Tue, Aug 25, 2009 at 1:16 PM, Mohammed Gamal<address@hidden> wrote:
> >> On Tue, Aug 25, 2009 at 12:33 PM, Jan Kiszka<address@hidden> wrote:
> >>> Mohammed Gamal wrote:
> >>>> qemu-system-x86_64 -hda /dev/null -cdrom <path_to_ubuntu_iso_image>
> >>>>
> >>> I only have kubuntu-9.04-alternate-amd64.iso at hand ATM, and with that
> >>> image I'm unable to reproduce. Will download and check standard ubuntu
> >>> later today.
> >>>
> >>>> I was using qemu-kvm, but I assume that using -no-kvm would be
> >>>> equivalent to using plain qemu, no?
> >>> Generally yes, but not necessarily (e.g. the BIOSes are different). So
> >>> it's better to check such issues also against "clean" qemu, specifically
> >>> as we are on qemu-devel here.
> >>>
> >>> Jan
> >>>
> >>>
> >> Just tested this now on a vanilla qemu, I am still able to reproduce
> >> the same issue.
> >>
> > 
> > This bug might be related to the same problem
> > https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/379000
> I think at least those issues should be solved with recent qemu and
> bioses. Note that this report refers to a fairly old qemu version
> (0.10.0-derived).

Btw I had reported the same symptom as in that ubuntu ticket for FreeBSD 8
hosts both with 0.10.6 and 0.11.0rc1 before:
As mentioned in that post I was able to work around the issue by passig
the linux guest kernels `no_timer_check' after which they seemed to boot up
just fine, so I suspect in that case its not actually an apic routing
problem but just guest timer irqs arriving late/irregularly which cause
the guest kernel timer checks to time out and fail.

 Just thought I'd mention... :)

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