Re: [Xen-devel] PAE PV guest kernel regression

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.06.12 at 10:54, Andrew Jones <drjones@xxxxxxxxxx> wrote:

> https://bugzilla.redhat.com/show_bug.cgi?id=829016 
> 
> was opened yesterday. Maybe the following commit
> is the culprit?
> 
> commit cb8095bba6d24118135a5683a956f4f4fb5f17bb
> Author: Jan Beulich <JBeulich@xxxxxxxx>
> Date:   Fri Jan 20 16:22:04 2012 +0000
> 
>     x86: atomic64 assembly improvements

Hardly - that change didn't even touch atomic64_read_cx8()
or any of its constraints.

Further more, this

*pdpt = 0000000023be6027 *pde = 00000000037c2067 *pte = 8000000023bdb061 
Oops: 0003 [#1] SMP 

tells us that this was a write-protection fault, yet the hypervisor
failed to emulate this (hence the hypervisor log would likely help).
After quite some time spent looking through the upstream 3.0.4
sources (and my local object files) I can't, however, spot where
the call to atomic64_read() is actually located in the functions in
question.

Jan


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