mm/migrate_device: Support COW PTE

Break COW PTE before collecting the pages in COW-ed PTE. Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com>
intel-lab-lkp · Dec 20, 2022 · 77cd284 · 77cd284
1 parent 5cd1951
commit 77cd284
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mm/migrate_device.c b/mm/migrate_device.c
@@ -106,6 +106,8 @@ static int migrate_vma_collect_pmd(pmd_t *pmdp,
 		}
 	}
 
+	if (!break_cow_pte_range(vma, pmdp, start, end))
+		return migrate_vma_collect_skip(start, end, walk);
 	if (unlikely(pmd_bad(*pmdp)))
 		return migrate_vma_collect_skip(start, end, walk);