Re: [Xen-devel] Re: xen/stable 2.6.32.9 32bit dom0 kernel crashes early on boot

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 03/08/2010 10:17 AM, Konrad Rzeszutek Wilk wrote:
> On Sat, Mar 06, 2010 at 05:05:09PM +0200, Pasi Kärkkäinen wrote:
>    
> > On Fri, Mar 05, 2010 at 12:51:02PM +0200, Pasi Kärkkäinen wrote:
> >      
> > > On Fri, Mar 05, 2010 at 09:13:59AM +0200, Pasi Kärkkäinen wrote:
> > >        
> > > > On Thu, Mar 04, 2010 at 01:33:39PM -0800, Jeremy Fitzhardinge wrote:
> > > >          
> > > > > On 03/04/2010 12:28 PM, Pasi Kärkkäinen wrote:
> > > > >            
> > > > > > It was 2.6.31.12-174.2.22.fc12.i686.PAE saying the above..
> > > > > > 2.6.32.9 xen/stable booted on baremetal doesn't say anything about NX.
> > > > > >
> > > > > >              
> > > > > What happens if you boot with noexec=no on the kernel command line?
> > > > >
> > > > >            
> > > > noexec=no didn't change anything.. still crashes. console output is the same as 
> > > > earlier.
> > > > I also checked the BIOS, it didn't seem to have any NX settings.
> > > >
> > > >          
> > > latest xen/master 2.6.31.6 seems to boot OK on this box, with the same Xen 
> > > 4.0.0-rc5 hypervisor.
> > >
> > > successful bootlog of xen/master 2.6.31.6 here:
> > > http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-xen-master-2.6.31.6-32b-works-log03.txt
> > >
> > >        
> > xen/stable 2.6.32.9 boots OK on baremetal (without Xen).
> > Does it help to have a log of the boot on baremetal?
> >
> > Here are a couple of xen/stable 2.6.32.9 crashing boots as Xen dom0,
> > with various debugging options, and also with "acpi=off":
> >      
> Could you find what is at c0405dbe and around that area with gdb?
>    
I think the problem is that there's something happening in 
kernel/head_32.S to test for NX and disable it if not present, which 
isn't happening on the Xen startup path.  But I haven't investigated 
that yet.
    J

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