D61549.1794795882.diff
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	Index: sys/arm64/arm64/pmap.c
	===================================================================
	--- sys/arm64/arm64/pmap.c
	+++ sys/arm64/arm64/pmap.c
	@@ -5645,8 +5645,26 @@
	pmap_store(tl3p, newpte);
	newpte += L3_SIZE;
	}
	+ /*
	+ * Revert to the last L3 entry within the L3C superpage to
	+ * detect wiring-only changes.
	+ */
	+ newpte -= L3_SIZE;
	}
	- dsb(ishst);
	+
	+ /*
	+ * A page fault does not automatically invalidate the TLB entry for a
	+ * valid mapping, so we must perform an invalidation on any change to
	+ * a valid mapping, including changes that add permissions. The only
	+ * exception is a wiring-only change. One TLB invalidation suffices
	+ * for L1 or L2 block mappings.
	+ */
	+ if ((origpte & ATTR_DESCR_VALID) != 0 &&
	+ ((origpte ^ newpte) & ~ATTR_SW_WIRED) != 0)
	+ pmap_invalidate_range(pmap, va, va + (psind == 1 ?
	+ L3C_SIZE : PAGE_SIZE), true);
	+ else
	+ dsb(ishst);

	if ((origpte & ATTR_DESCR_VALID) == 0)
	pmap_resident_count_inc(pmap, pagesizes[psind] / PAGE_SIZE);