Quoting Matthew Auld (2018-05-11 10:51:40)
> We write all 4K page entries, even when using 64K pages. In order to
> verify that the HW isn't cheating by using the 4K PTE instead of the 64K
> PTE, we want to remove all the surplus entries. If the HW skipped the
> 64K PTE, it will read/write into the scratch page instead - which we
> detect as missing results during selftests.
>
> v2: much improved commentary(Chris)
>
> Signed-off-by: Matthew Auld <[email protected]>
> Cc: Chris Wilson <[email protected]>
> Cc: Changbin Du <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
-Chris
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