[PATCH 7/7] CXL: Unmap MMIO regions when detaching a context

[Ian Munsie]

Excerpts from Ian Munsie's message of 2014-12-08 19:18:01 +1100:
> From: Ian Munsie <imunsie at au1.ibm.com>
> 
> If we need to force detach a context (e.g. due to EEH or simply force
> unbinding the driver) we should prevent the userspace contexts from
> being able to access the Problem State Area MMIO region further, which
> they may have mapped with mmap().
> 
> This patch unmaps any mapped MMIO regions when detaching a userspace
> context.

Might want to drop this one for now - Philippe found that it sometimes
causes an issue when multiple contexts are using the afu. Seems that
unmap_mapping_range() unmapped a bit more than I expected.

Cheers,
-Ian