D41760.diff
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	diff --git a/sys/arm64/arm64/identcpu.c b/sys/arm64/arm64/identcpu.c
	--- a/sys/arm64/arm64/identcpu.c
	+++ b/sys/arm64/arm64/identcpu.c
	@@ -2259,6 +2259,31 @@
	/* Log features before APs are released and start printing to the dmesg. */
	SYSINIT(cpu_features, SI_SUB_SMP - 1, SI_ORDER_ANY, cpu_features_sysinit, NULL);

	+static void
	+tcr_set_e0pd1(void *arg __unused)
	+{
	+ uint64_t tcr;
	+
	+ tcr = READ_SPECIALREG(tcr_el1);
	+ tcr \|= TCR_E0PD1;
	+ WRITE_SPECIALREG(tcr_el1, tcr);
	+ isb();
	+}
	+
	+/* Enable support for more recent architecture features */
	+static void
	+cpu_feat_support(void *arg __unused)
	+{
	+ /*
	+ * If FEAT_E0PD is supported use it to cause faults without a page
	+ * table walk if userspace tries to access kernel memory.
	+ */
	+ if (ID_AA64MMFR2_E0PD_VAL(kern_cpu_desc.id_aa64mmfr2) !=
	+ ID_AA64MMFR2_E0PD_NONE)
	+ smp_rendezvous(NULL, tcr_set_e0pd1, NULL, NULL);
	+}
	+SYSINIT(cpu_feat_support, SI_SUB_SMP, SI_ORDER_ANY, cpu_feat_support, NULL);
	+
	#ifdef COMPAT_FREEBSD32
	static u_long
	parse_cpu_features_hwcap32(void)