Re: [Xen-devel] x86/AMD: Nested hvm crashes in 4.3

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.06.13 at 02:24, Suravee Suthikulanit <suravee.suthikulpanit@xxxxxxx> 
>>> wrote:
> I have found an issue in where the system crash right when I start 
> another HVM guest inside an HVM guest.  I have traced back to the patch 
> which the issue started.
> 
> commit f1bde87fc08ce8c818a1640a8fe4765d48923091
> Author: Jan Beulich <jbeulich@xxxxxxxx>
> Date:   Fri Feb 8 11:06:04 2013 +0100
> 
>      x86: debugging code for testing 16Tb support on smaller memory systems
> 
>      Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>      Acked-by: Keir Fraser <keir@xxxxxxx>

We had issues exposed by this patch before, but any such issue
would just have been masked before that patch (and would
surface on a system with more than 5Tb of memory anyway). So
it is very unlikely for the patch itself to be at fault.

Furthermore, the crash them supposedly is because of the code
added conditional upon NDEBUG, and hence would (on a smaller
memory system) otherwise not surface at all for a production
(debug=n) build.

> The issue doesn't reproduce when starting a PV (L2) guest inside an HVM 
> (L1) guest.

"Does not" or "does"? In the former case - what is this supposed to
tell me?

In any case - without you sharing technical details (register/stack
dump of the crash at the very least) I don't think I have anything
at hand to look for possible problems.

Jan


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