On Thu, 2017-01-26 at 03:45 -0700, Jan Beulich wrote:
> 
> This is too broad a statement: MMIO pages for which mfn_valid()
> is true would still allow WC use.

... where mfn_valid() would be true for MMIO regions in the low memory
hole, but not for regions above all physical memory?

> The only other issue with the patch that I can see is that you need
> to eliminate all the hard tabs you're introducing.

Bad emacs; no biscuit. I shall teach it that we're not in Kansas any
more, and repost. Thanks.