[PATCH v1 00/18] Permission Indirection Extension

[Mark Brown]

On Thu, Mar 09, 2023 at 02:52:28PM +0000, Joey Gouly wrote:

> The PTEs bit that are repurposed for use with permission indirection are:
> 	54 PTE_UXN
> 	53 PTE_PXN
> 	51 PTE_DBM
> 	6 PTE_USER

> The way that PIE is implemented in this patchset is that the encodings are
> picked such that they match how Linux currently sets the bits in the PTEs, so
> none of the page table handling has changed. This means this patchset keeps the
> same functionality as currently implemented, but allows for future expansion.

While it's not strictly needed as a result of this patch set since it
aims to implement the same encodings as currently used as soon as we
use any of the new functionality that the extension makes available
we'll need updates to the page table dumping in ptdump.c and task_mmu.c
to decode the indirect encodings natively rather than just relying on
the overlap with the direct encodings.
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