When faulting or updating the device page table properly handle the case of
device memory entry.
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
---
mm/hmm.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/mm/hmm.c b/mm/hmm.c
index a5706d2..9455443 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -616,6 +616,13 @@ static void hmm_mirror_update_pte(struct hmm_mirror *mirror,
goto out;
}
+ if (hmm_pte_test_valid_dev(hmm_pte)) {
+ *hmm_pte &= event->pte_mask;
+ if (!hmm_pte_test_valid_dev(hmm_pte))
+ hmm_pt_iter_directory_unref(iter);
+ return;
+ }
+
if (!hmm_pte_test_valid_dma(hmm_pte))
return;
@@ -808,6 +815,12 @@ static int hmm_mirror_fault_pmd(pmd_t *pmdp,
ptep = pte_offset_map(pmdp, start);
hmm_pt_iter_directory_lock(iter);
do {
+ if (hmm_pte_test_valid_dev(&hmm_pte[i])) {
+ if (write)
+ hmm_pte_set_write(&hmm_pte[i]);
+ continue;
+ }
+
if (!pte_present(*ptep) ||
(write && !pte_write(*ptep)) ||
pte_protnone(*ptep)) {
--
2.4.3
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