Re: [Xen-devel] [PATCH] x86: Allow write-combining on MMIO mappings again

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.01.17 at 11:55, <dwmw2@xxxxxxxxxxxxx> wrote:
> 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?

Even for pages immediately above physical memory mfn_valid()
may be true, iirc.

Jan


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