Re: [Xen-devel] VM hangs during boot on 3.0.4 dom0 kernel, works on alternative hardware

[Anthony Wright <anthony@xxxxxxxxxxxxxxx>]

----- Original Message -----
> On 06/09/2011 17:16, Konrad Rzeszutek Wilk wrote:
> > On Mon, Sep 05, 2011 at 11:31:16AM +0100, Anthony Wright wrote:
> >> I have two machines with identical Dom0's and DomUs, but different
> >> hardware. The Dom0 has a patch which I produced myself based on the
> >> "Re:
> >> [Xen-devel] Kernel bug from 3.0 (was phy disks and vifs timing out
> >> in
> >> DomU)" thread. The patch calls vmalloc_sync_all after every
> >> alloc_vm_area, and I realise this isn't the best solution, but it
> >> allowed me to move forward.
> > <nods>
> >> The patch fixes the problem I had on one machine, so that now the
> >> VMs
> >> boot correctly, but I have another system with an identical setup
> >> (identical Dom0 & DomU kernels, identical startup for DomU) and the
> >> VM
> >> fails to start. I have attached a copy of the console log from the
> >> good
> >> VM and the bad VM.
> > And what does the dom0 and xen hypervisor log give you?
> >
> > It looks to be hanging at identifying the CPU - is the hardware
> > quite different from one setup to another? Have you toyed with
> > using the cpuid flag in the guest to mimic the lowest CPU type?
> I've found a solution to my problem. The PV DomU was running a 32 bit
> linux kernel version 2.6.30.1. I hoped that a new kernel would be able
> to handle to CPU more effectively, and so I upgraded my DomU kernel to
> 3.0.4, and now the DomU boots.
> 
> This solves the problem for me, but I'm slightly concerned that my
> original kernel wouldn't work with this CPU (the CPU type for the
> kernel
> builds is set to Pentium Pro). I'll try the 2.6.30.1 kernel on bare
> metal on monday to try to see if this is a xen/Dom0 kernel issue or a
> CPU/DomU issue.
> 
> Anthony
I've tried the 2.6.30.1 kernel on bare metal and it boots correctly, so it 
looks like some xen/Dom0 interaction is causing it to fail when run as a DomU. 
I have a work around (upgrading to 3.0.4 kernel), so it's not affecting me but 
I'm happy to do any diagnostics to help identify the cause of the problem.



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