From f36a0be961e835af2feb682ac43d13f1d081b964 Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Mon, 24 Apr 2017 07:52:44 +0000
Subject: MFC r316679: Do not lose dirty bits for removing PROT_WRITE on arm64.

---
 sys/arm64/arm64/pmap.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'sys/arm64')

diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c
index 500aeb3..6839758 100644
--- a/sys/arm64/arm64/pmap.c
+++ b/sys/arm64/arm64/pmap.c
@@ -2481,6 +2481,11 @@ pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
 		    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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