>>> On 26.01.17 at 11:55, 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 regio
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 oth
>>> On 26.01.17 at 09:57, wrote:
> Since the fix for XSA-154 in commit c61a6f74f80e ("x86: enforce
> consistent cachability of MMIO mappings"), HVM guests have no longer
> been able to use PAT to obtain write-combining on MMIO because the
> 'ignore PAT' bit is set in EPT.
This is too broad a stat
