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[Xen-bugs] [Bug 961] New: Xen crashes with 16GB of memory

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Subject: [Xen-bugs] [Bug 961] New: Xen crashes with 16GB of memory
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Date: Thu, 12 Apr 2007 15:15:49 -0700
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           Summary: Xen crashes with 16GB of memory
           Product: Xen
           Version: unstable
          Platform: PPC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: hollisb@xxxxxxxxxx

Xen uses the 16GB bit (16<<30) as a flag for mapping special pages. However,
when the system has 16GB of RAM, addresses up to 18GB are valid due to the 2GB
IO hole. When dom0 tries to map domU memory located above 16GB, Xen crashes.

The solution is to choose another bit. This should be easy because Xen tells
Linux what bit to use via the device tree, but Linux hardcodes the bit number
in some SLB assembly code.

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