Re: 2.6.28 64-bit domU not booting

[Chris Lalancette <clalance@redhat.com>]

Valtteri Kiviniemi wrote:
> Hi,
> 
> Im using vanilla 2.6.28 kernel from kernel.org and when I try to boot my 
>   domU with it, it just disappears without any error or warning.

Just to dig up this old thread: we've been seeing the same thing.  I *think* it
comes down to the NX bit (or the lack thereof); on machines without NX, the
early pagetable setup is trying to use the NX bit in the PTE flags, and the
hypervisor is telling it to go away.  The Red Hat bugzilla entry that I've filed
has more analysis:

https://bugzilla.redhat.com/show_bug.cgi?id=492523

Valtteri, can you give the output of "cat /proc/cpuinfo | grep flags", so we can
confirm that it's probably the same issue?

And it looks like Ian Campbell actually posted a patch upstream
(http://lkml.indiana.edu/hypermail/linux/kernel/0901.3/02668.html) that should
fix this, but I don't see it in any of the upstream trees.  Ian, Jeremy, do you
guys know what the status is there?  It would be good to get into 2.6.30, and
probably backport to the stable trees as well.

-- 
Chris Lalancette