linux-kernel - Re: BUG: 2.6.30.1 pv_ops kernel boot failure

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Message-ID: <20090825114233.GL20811@alberich.amd.com>
Date:	Tue, 25 Aug 2009 13:42:33 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	James Dingwall <james.dingwall@...ocs.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: BUG: 2.6.30.1 pv_ops kernel boot failure - bisected

On Tue, Aug 25, 2009 at 12:04:54PM +0100, James Dingwall wrote:
> 
> Hi,
> 
> I have encountered what appears to be a bug when using the 2.6.30 stable
> series as a pv_ops kernel under Xen 3.4.1.  The problem appears to have
> been introduced with the following commit (provided I bisected it
> correctly)
> 
> commit bb9b409349f533a919b6b6d95698fbe6ff4aa209
> Author: Andreas Herrmann <andreas.herrmann3@....com>
> Date:   Mon Jun 8 15:55:09 2009 +0200
> 
>     x86: Detect use of extended APIC ID for AMD CPUs
> 
> When I try and boot the domU (xm create -c) I do not get any output.
> With this commit reverted I can boot 2.6.30.5 pv_ops without issue,
> output follows below.  The system is a dual Opteron 242.  If more
> details about the hardware or configuration are required to debug this
> please let me know.  I'm willing to test any patches.


So it seems that commit

 commit 2cb078603abb612e3bcd428fb8122c3d39e08832
 Author: Jeremy Fitzhardinge <jeremy@...p.org>
 Date:   Wed Jul 22 09:59:35 2009 -0700

    x86, amd: Don't probe for extended APIC ID if APICs are disabled
    
    If we've logically disabled apics, don't probe the PCI space for the
    AMD extended APIC ID.
    
    [ Impact: prevent boot crash under Xen. ]
    
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
    Reported-by: Bastian Blank <bastian@...di.eu.org>
    Signed-off-by: H. Peter Anvin <hpa@...or.com>

needs to be added to 2.6.30.y for proper boot under Xen.
James, can you test this please?


Thanks,

Andreas

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