>>> On 08.12.17 at 15:38, <julien.gr...@linaro.org> wrote:
> On 08/12/17 08:03, Tim Deegan wrote:
>> It should be possible to do something like the misconfigured-entry bit
>> trick by _allocating_ the memory up-front and building the p2m entries
>> but only making them usable by the {IO}MMUs on first access. That
>> would make these early p2m walks shorter (because they can skip whole
>> subtrees that aren't marked present yet) without making major changes
>> to domain build or introducing run-time failures.
>
> I am not aware of any way on Arm to misconfigure an entry. We do have
> valid and access bits, although they will affect the IOMMU as well. So
> it will not be possible to get page-table sharing with this "feature"
> enabled.
How would you intend to solve the IOMMU part of the problem with
PoD? As was pointed out before - IOMMU and PoD are incompatible
on x86.
Jan
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