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Index: sys/arm64/arm64/pmap.c
===================================================================
--- sys/arm64/arm64/pmap.c
+++ sys/arm64/arm64/pmap.c
@@ -2481,6 +2481,11 @@
sva += L3_SIZE) {
l3 = pmap_load(l3p);
if (pmap_l3_valid(l3)) {
+ if ((l3 & ATTR_SW_MANAGED) &&
+ pmap_page_dirty(l3)) {
+ vm_page_dirty(PHYS_TO_VM_PAGE(l3 &
+ ~ATTR_MASK));
+ }
pmap_set(l3p, ATTR_AP(ATTR_AP_RO));
PTE_SYNC(l3p);
/* XXX: Use pmap_invalidate_range */

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