arm64: contpte: fix set_access_flags() no-op check for SMMU/ATS faults

contpte_ptep_set_access_flags() compared the gathered ptep_get() value
against the requested entry to detect no-ops. ptep_get() ORs AF/dirty
from all sub-PTEs in the CONT block, so a dirty sibling can make the
target appear already-dirty. When the gathered value matches entry, the
function returns 0 even though the target sub-PTE still has PTE_RDONLY
set in hardware.

For a CPU with FEAT_HAFDBS this gathered view is fine, since hardware may
set AF/dirty on any sub-PTE and CPU TLB behavior is effectively gathered
across the CONT range. But page-table walkers that evaluate each
descriptor individually (e.g. a CPU without DBM support, or an SMMU
without HTTU, or with HA/HD disabled in CD.TCR) can keep faulting on the
unchanged target sub-PTE, causing an infinite fault loop.

Gathering can therefore cause false no-ops when only a sibling has been
updated:
 - write faults: target still has PTE_RDONLY (needs PTE_RDONLY cleared)
 - read faults:  target still lacks PTE_AF

Fix by checking each sub-PTE against the requested AF/dirty/write state
(the same bits consumed by __ptep_set_access_flags()), using raw
per-PTE values rather than the gathered ptep_get() view, before
returning no-op. Keep using the raw target PTE for the write-bit unfold
decision.

Per Arm ARM (DDI 0487) D8.7.1 ("The Contiguous bit"), any sub-PTE in a CONT
range may become the effective cached translation and software must
maintain consistent attributes across the range.

Fixes: 4602e5757bcc ("arm64/mm: wire up PTE_CONT for user mappings")
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: stable@vger.kernel.org
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: James Houghton <jthoughton@google.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Piotr Jaroszynski <pjaroszynski@nvidia.com>
Acked-by: Balbir Singh <balbirs@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c
index b929a455103f877ab763ebc71467c529757d8539..1519d090d5ea7b586daebba8e0a616690bef56f4 100644 (file)
--- a/arch/arm64/mm/contpte.c
+++ b/arch/arm64/mm/contpte.c
@@ -599,6 +599,27 @@ void contpte_clear_young_dirty_ptes(struct vm_area_struct *vma,
 }
 EXPORT_SYMBOL_GPL(contpte_clear_young_dirty_ptes);
 
+static bool contpte_all_subptes_match_access_flags(pte_t *ptep, pte_t entry)
+{
+       pte_t *cont_ptep = contpte_align_down(ptep);
+       /*
+        * PFNs differ per sub-PTE. Match only bits consumed by
+        * __ptep_set_access_flags(): AF, DIRTY and write permission.
+        */
+       const pteval_t cmp_mask = PTE_RDONLY | PTE_AF | PTE_WRITE | PTE_DIRTY;
+       pteval_t entry_cmp = pte_val(entry) & cmp_mask;
+       int i;
+
+       for (i = 0; i < CONT_PTES; i++) {
+               pteval_t pte_cmp = pte_val(__ptep_get(cont_ptep + i)) & cmp_mask;
+
+               if (pte_cmp != entry_cmp)
+                       return false;
+       }
+
+       return true;
+}
+
 int contpte_ptep_set_access_flags(struct vm_area_struct *vma,
                                        unsigned long addr, pte_t *ptep,
                                        pte_t entry, int dirty)
@@ -608,13 +629,37 @@ int contpte_ptep_set_access_flags(struct vm_area_struct *vma,
        int i;
 
        /*
-        * Gather the access/dirty bits for the contiguous range. If nothing has
-        * changed, its a noop.
+        * Check whether all sub-PTEs in the CONT block already match the
+        * requested access flags/write permission, using raw per-PTE values
+        * rather than the gathered ptep_get() view.
+        *
+        * __ptep_set_access_flags() can update AF, dirty and write
+        * permission, but only to make the mapping more permissive.
+        *
+        * ptep_get() gathers AF/dirty state across the whole CONT block,
+        * which is correct for a CPU with FEAT_HAFDBS. But page-table
+        * walkers that evaluate each descriptor individually (e.g. a CPU
+        * without DBM support, or an SMMU without HTTU, or with HA/HD
+        * disabled in CD.TCR) can keep faulting on the target sub-PTE if
+        * only a sibling has been updated. Gathering can therefore cause
+        * false no-ops when only a sibling has been updated:
+        *  - write faults: target still has PTE_RDONLY (needs PTE_RDONLY cleared)
+        *  - read faults:  target still lacks PTE_AF
+        *
+        * Per Arm ARM (DDI 0487) D8.7.1, any sub-PTE in a CONT range may
+        * become the effective cached translation, so all entries must have
+        * consistent attributes. Check the full CONT block before returning
+        * no-op, and when any sub-PTE mismatches, proceed to update the whole
+        * range.
         */
-       orig_pte = pte_mknoncont(ptep_get(ptep));
-       if (pte_val(orig_pte) == pte_val(entry))
+       if (contpte_all_subptes_match_access_flags(ptep, entry))
                return 0;
 
+       /*
+        * Use raw target pte (not gathered) for write-bit unfold decision.
+        */
+       orig_pte = pte_mknoncont(__ptep_get(ptep));
+
        /*
         * We can fix up access/dirty bits without having to unfold the contig
         * range. But if the write bit is changing, we must unfold.