On Fri, Dec 15, 2017 at 6:48 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
>
> Treating protection key bits as "escalate to page fault and let that
> deal with the checks" should be fine
Well, it's *semantically* fine and I think it's the right model from
that standpoint.
However, since the main use case of protection keys is probably
databases (Dave?) and since those also might be performance-sensitive
about direct-IO doing page table lookups, it might not be great in
practice.
Linus
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