[PATCH v4 11/14] mm/migrate_device: Support COW PTE

Chih-En Lin
2023-02-07T03:54:53Z

Break COW PTE before collecting the pages in COW-ed PTE.

Signed-off-by: Chih-En Lin <shiyn.lin@gmail.com>
---
mm/migrate_device.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/migrate_device.c b/mm/migrate_device.c
index 721b2365dbca..2930e591e8fc 100644
--- 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, start, end))
+ return migrate_vma_collect_skip(start, end, walk);
if (unlikely(pmd_bad(*pmdp)))
return migrate_vma_collect_skip(start, end, walk);

--
2.34.1