[PATCH RFC v9 13/25] mm: kpkeys: Introduce early page table allocator

[Dave Hansen]

On 8/18/26 07:08, Kevin Brodsky wrote:
> This patch addresses the second category: PTPs allocated via memblock.
> Such PTPs are notably used to create the linear map. Protecting them as
> soon as they are allocated would require modifying the linear map while
> it is being created, which seems at best difficult. Instead, a
> simple allocator is introduced, obtaining pages from memblock and
> keeping track of all allocated ranges to set their pkey once it is
> safe to do so.

What makes setting a pkey on the memory "unsafe"? Is there something
preventing just making access permissive during boot?