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[Xen-ia64-devel] Linux bug with Xen

from [Tristan Gingold]

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Subject:	[Xen-ia64-devel] Linux bug with Xen
From:	Tristan Gingold <Tristan.Gingold@xxxxxxxx>
Date:	Thu, 23 Mar 2006 13:31:00 +0100
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Hi,

I think I hit a linux kernel bug.
The situation is:

* an interrupt happen
* interrupt IVT entry is executed with ic=0
* within the entry, SAVE_MIN_WITH_COVER try to access to the current area,
  pointed by kr6
* Unfortunatly, the 'current' area is not mapped, thus xen has to handle the 
page fault.
* the translation fails inside Xen and Xen injects a nested dtlb miss fault.
* The linux nested dtlb miss don't know how to handle this fault (only vmemmap 
are handled).

As far as I know/read the sources, the linux current area is not TR-mapped.  
So Xen appears to be correct and the linux kernel may be buggy here.

I will try to understand why Xen cannot resolve the page fault.

Comments ?

Tristan.



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