diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
index 1eec3971f0a9..e4d862420bb4 100644
--- a/arch/arm64/include/asm/mmu.h
+++ b/arch/arm64/include/asm/mmu.h
@@ -29,91 +29,11 @@ typedef struct {
  */
 #define ASID(mm)	((mm)->context.id.counter & 0xffff)
 
+extern bool arm64_use_ng_mappings;
+
 static inline bool arm64_kernel_unmapped_at_el0(void)
 {
-	return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) &&
-	       cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
-}
-
-/*
- * This check is triggered during the early boot before the cpufeature
- * is initialised. Checking the status on the local CPU allows the boot
- * CPU to detect the need for non-global mappings and thus avoiding a
- * pagetable re-write after all the CPUs are booted. This check will be
- * anyway run on individual CPUs, allowing us to get the consistent
- * state once the SMP CPUs are up and thus make the switch to non-global
- * mappings if required.
- */
-static inline bool kaslr_requires_kpti(void)
-{
-	bool tx1_bug;
-	u64 ftr;
-
-	if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE))
-		return false;
-
-	/*
-	 * E0PD does a similar job to KPTI so can be used instead
-	 * where available.
-	 */
-	if (IS_ENABLED(CONFIG_ARM64_E0PD)) {
-		ftr = read_sysreg_s(SYS_ID_AA64MMFR2_EL1);
-		if ((ftr >> ID_AA64MMFR2_E0PD_SHIFT) & 0xf)
-			return false;
-	}
-
-	/*
-	 * Systems affected by Cavium erratum 24756 are incompatible
-	 * with KPTI.
-	 */
-	if (!IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) {
-		tx1_bug = false;
-#ifndef MODULE
-	} else if (!static_branch_likely(&arm64_const_caps_ready)) {
-		extern const struct midr_range cavium_erratum_27456_cpus[];
-
-		tx1_bug = is_midr_in_range_list(read_cpuid_id(),
-						cavium_erratum_27456_cpus);
-#endif
-	} else {
-		tx1_bug = __cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456);
-	}
-	if (tx1_bug)
-		return false;
-
-	return kaslr_offset() > 0;
-}
-
-static inline bool arm64_kernel_use_ng_mappings(void)
-{
-	/* What's a kpti? Use global mappings if we don't know. */
-	if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0))
-		return false;
-
-	/*
-	 * Note: this function is called before the CPU capabilities have
-	 * been configured, so our early mappings will be global. If we
-	 * later determine that kpti is required, then
-	 * kpti_install_ng_mappings() will make them non-global.
-	 */
-	if (arm64_kernel_unmapped_at_el0())
-		return true;
-
-	/*
-	 * Once we are far enough into boot for capabilities to be
-	 * ready we will have confirmed if we are using non-global
-	 * mappings so don't need to consider anything else here.
-	 */
-	if (static_branch_likely(&arm64_const_caps_ready))
-		return false;
-
-	/*
-	 * KASLR is enabled so we're going to be enabling kpti on non-broken
-	 * CPUs regardless of their susceptibility to Meltdown. Rather
-	 * than force everybody to go through the G -> nG dance later on,
-	 * just put down non-global mappings from the beginning
-	 */
-	return kaslr_requires_kpti();
+	return arm64_use_ng_mappings;
 }
 
 typedef void (*bp_hardening_cb_t)(void);
@@ -167,6 +87,7 @@ extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
 			       pgprot_t prot, bool page_mappings_only);
 extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
 extern void mark_linear_text_alias_ro(void);
+extern bool kaslr_requires_kpti(void);
 
 #define INIT_MM_CONTEXT(name)	\
 	.pgd = init_pg_dir,
diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h
index 8dc6c5cdabe6..0a1fd95a8972 100644
--- a/arch/arm64/include/asm/pgtable-prot.h
+++ b/arch/arm64/include/asm/pgtable-prot.h
@@ -26,8 +26,8 @@
 #define _PROT_DEFAULT		(PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
 #define _PROT_SECT_DEFAULT	(PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
 
-#define PTE_MAYBE_NG		(arm64_kernel_use_ng_mappings() ? PTE_NG : 0)
-#define PMD_MAYBE_NG		(arm64_kernel_use_ng_mappings() ? PMD_SECT_NG : 0)
+#define PTE_MAYBE_NG		(arm64_kernel_unmapped_at_el0() ? PTE_NG : 0)
+#define PMD_MAYBE_NG		(arm64_kernel_unmapped_at_el0() ? PMD_SECT_NG : 0)
 
 #define PROT_DEFAULT		(_PROT_DEFAULT | PTE_MAYBE_NG)
 #define PROT_SECT_DEFAULT	(_PROT_SECT_DEFAULT | PMD_MAYBE_NG)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 88aa5ab02926..4a031111ceb5 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -47,6 +47,9 @@ static struct arm64_cpu_capabilities const __ro_after_init *cpu_hwcaps_ptrs[ARM6
 /* Need also bit for ARM64_CB_PATCH */
 DECLARE_BITMAP(boot_capabilities, ARM64_NPATCHABLE);
 
+bool arm64_use_ng_mappings = false;
+EXPORT_SYMBOL(arm64_use_ng_mappings);
+
 /*
  * Flag to indicate if we have computed the system wide
  * capabilities based on the boot time active CPUs. This
@@ -966,6 +969,53 @@ has_useable_cnp(const struct arm64_cpu_capabilities *entry, int scope)
 	return has_cpuid_feature(entry, scope);
 }
 
+/*
+ * This check is triggered during the early boot before the cpufeature
+ * is initialised. Checking the status on the local CPU allows the boot
+ * CPU to detect the need for non-global mappings and thus avoiding a
+ * pagetable re-write after all the CPUs are booted. This check will be
+ * anyway run on individual CPUs, allowing us to get the consistent
+ * state once the SMP CPUs are up and thus make the switch to non-global
+ * mappings if required.
+ */
+bool kaslr_requires_kpti(void)
+{
+	bool tx1_bug;
+	u64 ftr;
+
+	if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE))
+		return false;
+
+	/*
+	 * E0PD does a similar job to KPTI so can be used instead
+	 * where available.
+	 */
+	if (IS_ENABLED(CONFIG_ARM64_E0PD)) {
+		ftr = read_sysreg_s(SYS_ID_AA64MMFR2_EL1);
+		if ((ftr >> ID_AA64MMFR2_E0PD_SHIFT) & 0xf)
+			return false;
+	}
+
+	/*
+	 * Systems affected by Cavium erratum 24756 are incompatible
+	 * with KPTI.
+	 */
+	if (!IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) {
+		tx1_bug = false;
+	} else if (!static_branch_likely(&arm64_const_caps_ready)) {
+		extern const struct midr_range cavium_erratum_27456_cpus[];
+
+		tx1_bug = is_midr_in_range_list(read_cpuid_id(),
+						cavium_erratum_27456_cpus);
+	} else {
+		tx1_bug = __cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456);
+	}
+	if (tx1_bug)
+		return false;
+
+	return kaslr_offset() > 0;
+}
+
 static bool __meltdown_safe = true;
 static int __kpti_forced; /* 0: not forced, >0: forced on, <0: forced off */
 
@@ -1044,7 +1094,6 @@ kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused)
 	extern kpti_remap_fn idmap_kpti_install_ng_mappings;
 	kpti_remap_fn *remap_fn;
 
-	static bool kpti_applied = false;
 	int cpu = smp_processor_id();
 
 	/*
@@ -1052,7 +1101,7 @@ kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused)
 	 * it already or we have KASLR enabled and therefore have not
 	 * created any global mappings at all.
 	 */
-	if (kpti_applied || kaslr_offset() > 0)
+	if (arm64_use_ng_mappings)
 		return;
 
 	remap_fn = (void *)__pa_symbol(idmap_kpti_install_ng_mappings);
@@ -1062,7 +1111,7 @@ kpti_install_ng_mappings(const struct arm64_cpu_capabilities *__unused)
 	cpu_uninstall_idmap();
 
 	if (!cpu)
-		kpti_applied = true;
+		arm64_use_ng_mappings = true;
 
 	return;
 }
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 56f664561754..b6f9455d7ca3 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -285,6 +285,13 @@ void __init setup_arch(char **cmdline_p)
 
 	*cmdline_p = boot_command_line;
 
+	/*
+	 * If know now we are going to need KPTI then use non-global
+	 * mappings from the start, avoiding the cost of rewriting
+	 * everything later.
+	 */
+	arm64_use_ng_mappings = kaslr_requires_kpti();
+
 	early_fixmap_init();
 	early_ioremap_init();