selftests/mm/hmm-tests: test pagemap reads of PMD device-private entries

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To cover pagemap paths scanning PMD entries, add assertions to check
whether a device-private PMD entry has the correct pagemap information -
the PM_SWAP bit must be on in the pagemap entry.  Before that, we must
assert through HMM_DMIRROR_SNAPSHOT snapshot that the leaf entry is at PMD
level and not PTE level.

Link: https://lore.kernel.org/20260604055308.1947679-3-dev.jain@arm.com
Signed-off-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Cc: Balbir Singh <balbirs@nvidia.com>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: Oscar Salvador (SUSE) <osalvador@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Dev Jain 2026-06-04 05:53:06 +00:00 • committed by Andrew Morton

parent cd1fc0e3c1

commit e3d8707358

1 changed files with 32 additions and 2 deletions

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tools/testing/selftests/mm/hmm-tests.c

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