arm64/mm: automatically fold contpte mappings

There are situations where a change to a single PTE could cause the
contpte block in which it resides to become foldable (i.e.  could be
repainted with the contiguous bit).  Such situations arise, for example,
when user space temporarily changes protections, via mprotect, for
individual pages, such can be the case for certain garbage collectors.

We would like to detect when such a PTE change occurs.  However this can
be expensive due to the amount of checking required.  Therefore only
perform the checks when an indiviual PTE is modified via mprotect
(ptep_modify_prot_commit() -> set_pte_at() -> set_ptes(nr=1)) and only
when we are setting the final PTE in a contpte-aligned block.

Link: https://lkml.kernel.org/r/20240215103205.2607016-19-ryan.roberts@arm.com


Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morse <james.morse@arm.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>