disabling kernel access to memory

[Joel Schopp]

>>When creating artificial 'holes' in the physical address space,
>>I would really like to disable all access to this memory in an
>>effort to catch anyone making incorrect accesses.  Of course,
>>these holes are at least 16MB (min LMB size) in size.  Is there
>>an 'easy' way to prevent all access to these holes?
>
>
> You might be able to hand them back to the hypervisor using the DLPAR
> calls.

I think the idea is that DLPAR calls are the hard part.  Doing an
isolate requires all the PTEs and TCEs don't reference the memory for
instance.

Back in my userspace days I remember threading libraries liked to use
mprotect for such things.  Linux kernel has mprotect and sys_mprotect,
not sure if they will fit your needs or not.

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