Re: [PATCH v5 7/7] arm64: Add batched versions of ptep_modify_prot_start/commit

[Catalin Marinas <catalin.marinas@arm.com>]

On Fri, Jul 18, 2025 at 02:32:44PM +0530, Dev Jain wrote:
> Override the generic definition of modify_prot_start_ptes() to use
> get_and_clear_full_ptes(). This helper does a TLBI only for the starting
> and ending contpte block of the range, whereas the current implementation
> will call ptep_get_and_clear() for every contpte block, thus doing a
> TLBI on every contpte block. Therefore, we have a performance win.
> 
> The arm64 definition of pte_accessible() allows us to batch in the
> errata specific case:
> 
> #define pte_accessible(mm, pte)	\
> 	(mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid(pte))
> 
> All ptes are obviously present in the folio batch, and they are also valid.
> 
> Override the generic definition of modify_prot_commit_ptes() to simply
> use set_ptes() to map the new ptes into the pagetable.
> 
> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
> Signed-off-by: Dev Jain <dev.jain@arm.com>

The arm64 changes look fine to me:

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>