diff --git a/arch/arm64/include/asm/spectre.h b/arch/arm64/include/asm/spectre.h
index 4b3a5f050f71..e48afcb69392 100644
--- a/arch/arm64/include/asm/spectre.h
+++ b/arch/arm64/include/asm/spectre.h
@@ -18,6 +18,7 @@ enum mitigation_state {
 	SPECTRE_VULNERABLE,
 };
 
+struct pt_regs;
 struct task_struct;
 
 enum mitigation_state arm64_get_spectre_v2_state(void);
@@ -33,4 +34,5 @@ enum mitigation_state arm64_get_spectre_bhb_state(void);
 bool is_spectre_bhb_affected(const struct arm64_cpu_capabilities *entry, int scope);
 u8 spectre_bhb_loop_affected(int scope);
 void spectre_bhb_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
+bool try_emulate_el1_ssbs(struct pt_regs *regs, u32 instr);
 #endif	/* __ASM_SPECTRE_H */
diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index faa8a6bf2376..9c0e9d9eed6e 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -537,10 +537,13 @@ bool has_spectre_v4(const struct arm64_cpu_capabilities *cap, int scope)
 	return state != SPECTRE_UNAFFECTED;
 }
 
-static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr)
+bool try_emulate_el1_ssbs(struct pt_regs *regs, u32 instr)
 {
-	if (user_mode(regs))
-		return 1;
+	const u32 instr_mask = ~(1U << PSTATE_Imm_shift);
+	const u32 instr_val = 0xd500401f | PSTATE_SSBS;
+
+	if ((instr & instr_mask) != instr_val)
+		return false;
 
 	if (instr & BIT(PSTATE_Imm_shift))
 		regs->pstate |= PSR_SSBS_BIT;
@@ -548,19 +551,11 @@ static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr)
 		regs->pstate &= ~PSR_SSBS_BIT;
 
 	arm64_skip_faulting_instruction(regs, 4);
-	return 0;
+	return true;
 }
 
-static struct undef_hook ssbs_emulation_hook = {
-	.instr_mask	= ~(1U << PSTATE_Imm_shift),
-	.instr_val	= 0xd500401f | PSTATE_SSBS,
-	.fn		= ssbs_emulation_handler,
-};
-
 static enum mitigation_state spectre_v4_enable_hw_mitigation(void)
 {
-	static bool undef_hook_registered = false;
-	static DEFINE_RAW_SPINLOCK(hook_lock);
 	enum mitigation_state state;
 
 	/*
@@ -571,13 +566,6 @@ static enum mitigation_state spectre_v4_enable_hw_mitigation(void)
 	if (state != SPECTRE_MITIGATED || !this_cpu_has_cap(ARM64_SSBS))
 		return state;
 
-	raw_spin_lock(&hook_lock);
-	if (!undef_hook_registered) {
-		register_undef_hook(&ssbs_emulation_hook);
-		undef_hook_registered = true;
-	}
-	raw_spin_unlock(&hook_lock);
-
 	if (spectre_v4_mitigations_off()) {
 		sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_DSSBS);
 		asm volatile(SET_PSTATE_SSBS(1));
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index a2dfce6493d2..15d490ef7462 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -311,12 +311,7 @@ static int call_undef_hook(struct pt_regs *regs)
 	int (*fn)(struct pt_regs *regs, u32 instr) = NULL;
 	void __user *pc = (void __user *)instruction_pointer(regs);
 
-	if (!user_mode(regs)) {
-		__le32 instr_le;
-		if (get_kernel_nofault(instr_le, (__force __le32 *)pc))
-			goto exit;
-		instr = le32_to_cpu(instr_le);
-	} else if (compat_thumb_mode(regs)) {
+	if (compat_thumb_mode(regs)) {
 		/* 16-bit Thumb instruction */
 		__le16 instr_le;
 		if (get_user(instr_le, (__le16 __user *)pc))
@@ -409,9 +404,15 @@ void do_el0_undef(struct pt_regs *regs, unsigned long esr)
 
 void do_el1_undef(struct pt_regs *regs, unsigned long esr)
 {
-	if (call_undef_hook(regs) == 0)
+	u32 insn;
+
+	if (aarch64_insn_read((void *)regs->pc, &insn))
+		goto out_err;
+
+	if (try_emulate_el1_ssbs(regs, insn))
 		return;
 
+out_err:
 	die("Oops - Undefined instruction", regs, esr);
 }