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[Xen-bugs] [Bug 75] x86_64 - Unable to handle kernel NULL pointer derefe

To: xen-bugs@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-bugs] [Bug 75] x86_64 - Unable to handle kernel NULL pointer dereference at 0000000000000880 RIP:<ffffffff80116d62>{do_page_fault+370}
From: jyoung5@xxxxxxxxxx
Date: Fri, 08 Jul 2005 04:13:48 +0000
Delivery-date: Fri, 08 Jul 2005 04:13:53 +0000
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jyoung5@xxxxxxxxxx changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

------- Additional Comments From jyoung5@xxxxxxxxxx  2005-07-08 04:13 -------
Here is the solution to this problem:

- Bootup blade
- Press F1 to enter Configuration/Setup on boot
- Go to
        Advanced Setup -> CPU Options
- Then set enable "Exectue Disable Bit":
        Exectue Disable Bit     [ Enabled ]
- Save & Exit

So this was just strange..didn't even know this was possible. Apparently on
Intel EM64T CPUs one can disable the ability for the CPU to understand the NX
bit...where as with AMD64 processors you don't have this ability and the
Operating system just tells it to enforce the bit or not. It is assumed in the
code currently that a x86-64 CPU will understand the NX bit. I will bring this
to the list to see what folks want to do.

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