During remove_migration_pte(), entries for device coherent type pages that were not created through special migration ptes, ignore _PAGE_RW flag. This path can be found at migrate_device_page(), where valid vma is not required. In this case, migrate_vma_collect_pmd() is not called and special migration ptes are not set.
Signed-off-by: Alex Sierra alex.sierra@amd.com --- mm/migrate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c index 6c31ee1e1c9b..e18ddee56f37 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -206,7 +206,8 @@ static bool remove_migration_pte(struct folio *folio, * Recheck VMA as permissions can change since migration started */ entry = pte_to_swp_entry(*pvmw.pte); - if (is_writable_migration_entry(entry)) + if (is_writable_migration_entry(entry) || + is_device_coherent_page(pfn_to_page(pvmw.pfn))) pte = maybe_mkwrite(pte, vma); else if (pte_swp_uffd_wp(*pvmw.pte)) pte = pte_mkuffd_wp(pte);