diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h
index c43b4ac..609bc44 100644
--- a/arch/arm64/include/asm/fpsimd.h
+++ b/arch/arm64/include/asm/fpsimd.h
@@ -37,6 +37,8 @@ struct fpsimd_state {
 			u32 fpcr;
 		};
 	};
+	/* the id of the last cpu to have restored this state */
+	unsigned int last_cpu;
 };
 
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
@@ -57,6 +59,7 @@ extern void fpsimd_load_state(struct fpsimd_state *state);
 
 extern void fpsimd_thread_switch(struct task_struct *next);
 extern void fpsimd_flush_thread(void);
+extern void fpsimd_reload_fpstate(void);
 
 #endif
 
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 23a3c47..7c4fd57 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -106,6 +106,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SIGPENDING		0
 #define TIF_NEED_RESCHED	1
 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
+#define TIF_FOREIGN_FPSTATE	3	/* CPU's FP state is not current's */
 #define TIF_SYSCALL_TRACE	8
 #define TIF_POLLING_NRFLAG	16
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
@@ -118,10 +119,11 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
+#define _TIF_FOREIGN_FPSTATE	(1 << TIF_FOREIGN_FPSTATE)
 #define _TIF_32BIT		(1 << TIF_32BIT)
 
 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
-				 _TIF_NOTIFY_RESUME)
+				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
 
 #endif /* __KERNEL__ */
 #endif /* __ASM_THREAD_INFO_H */
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 3881fd1..7267496 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -589,7 +589,7 @@ fast_work_pending:
 	str	x0, [sp, #S_X0]			// returned x0
 work_pending:
 	tbnz	x1, #TIF_NEED_RESCHED, work_resched
-	/* TIF_SIGPENDING or TIF_NOTIFY_RESUME case */
+	/* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */
 	ldr	x2, [sp, #S_PSTATE]
 	mov	x0, sp				// 'regs'
 	tst	x2, #PSR_MODE_MASK		// user mode regs?
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index bb785d2..3baa0fc 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -34,6 +34,23 @@
 #define FPEXC_IDF	(1 << 7)
 
 /*
+ * In order to reduce the number of times the fpsimd state is frivolously saved
+ * and restored, keep track here of which task's userland owns the current state
+ * of the FPSIMD register file.
+ *
+ * This percpu variable points to the fpsimd_state.last_cpu field of the task
+ * whose FPSIMD state was most recently loaded onto this cpu. The last_cpu field
+ * itself contains the id of the cpu onto which the task's FPSIMD state was
+ * loaded most recently. So, to decide whether we can skip reloading the FPSIMD
+ * state, we need to check
+ * (a) whether this task was the last one to have its FPSIMD state loaded onto
+ *     this cpu
+ * (b) whether this task has manipulated its FPSIMD state on another cpu in the
+ *     meantime
+ */
+static DEFINE_PER_CPU(unsigned int *, fpsimd_last_cpu);
+
+/*
  * Trapped FP/ASIMD access.
  */
 void do_fpsimd_acc(unsigned int esr, struct pt_regs *regs)
@@ -71,18 +88,56 @@ void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs)
 
 void fpsimd_thread_switch(struct task_struct *next)
 {
-	/* check if not kernel threads */
-	if (current->mm)
+	/*
+	 * The thread flag TIF_FOREIGN_FPSTATE conveys that the userland FPSIMD
+	 * state belonging to the current task is not present in the registers
+	 * but has (already) been saved to memory in order for the kernel to be
+	 * able to go off and use the registers for something else. Therefore,
+	 * we must not (re)save the register contents if this flag is set.
+	 */
+	if (current->mm && !test_thread_flag(TIF_FOREIGN_FPSTATE))
 		fpsimd_save_state(&current->thread.fpsimd_state);
-	if (next->mm)
-		fpsimd_load_state(&next->thread.fpsimd_state);
+
+	if (next->mm) {
+		/*
+		 * If we are switching to a task whose most recent userland NEON
+		 * contents are already in the registers of *this* cpu, we can
+		 * skip loading the state from memory. Otherwise, set the
+		 * TIF_FOREIGN_FPSTATE flag so the state will be loaded upon the
+		 * next entry of userland.
+		 */
+		struct fpsimd_state *st = &next->thread.fpsimd_state;
+
+		if (__get_cpu_var(fpsimd_last_cpu) == &st->last_cpu
+		    && st->last_cpu == smp_processor_id())
+			clear_ti_thread_flag(task_thread_info(next),
+					     TIF_FOREIGN_FPSTATE);
+		else
+			set_ti_thread_flag(task_thread_info(next),
+					   TIF_FOREIGN_FPSTATE);
+	}
 }
 
 void fpsimd_flush_thread(void)
 {
-	preempt_disable();
 	memset(&current->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
-	fpsimd_load_state(&current->thread.fpsimd_state);
+	set_thread_flag(TIF_FOREIGN_FPSTATE);
+}
+
+void fpsimd_reload_fpstate(void)
+{
+	preempt_disable();
+	if (test_and_clear_thread_flag(TIF_FOREIGN_FPSTATE)) {
+		/*
+		 * We are entering userland and the userland context is not yet
+		 * present in the registers.
+		 */
+		struct fpsimd_state *st = &current->thread.fpsimd_state;
+
+		fpsimd_load_state(st);
+		__get_cpu_var(fpsimd_last_cpu) = &st->last_cpu;
+		st->last_cpu = smp_processor_id();
+	}
 	preempt_enable();
 }
 
@@ -97,16 +152,21 @@ void kernel_neon_begin(void)
 	BUG_ON(in_interrupt());
 	preempt_disable();
 
-	if (current->mm)
+	/*
+	 * Save the userland FPSIMD state if we have one and if we haven't done
+	 * so already. Clear fpsimd_last_cpu to indicate that there is no
+	 * longer userland context in the registers.
+	 */
+	if (current->mm && !test_and_set_thread_flag(TIF_FOREIGN_FPSTATE)) {
 		fpsimd_save_state(&current->thread.fpsimd_state);
+		__get_cpu_var(fpsimd_last_cpu) = NULL;
+	}
+
 }
 EXPORT_SYMBOL(kernel_neon_begin);
 
 void kernel_neon_end(void)
 {
-	if (current->mm)
-		fpsimd_load_state(&current->thread.fpsimd_state);
-
 	preempt_enable();
 }
 EXPORT_SYMBOL(kernel_neon_end);
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 7ae8a1f..ef88831 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -195,7 +195,8 @@ void release_thread(struct task_struct *dead_task)
 
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
-	fpsimd_save_state(&current->thread.fpsimd_state);
+	if (!test_thread_flag(TIF_FOREIGN_FPSTATE))
+		fpsimd_save_state(&current->thread.fpsimd_state);
 	*dst = *src;
 	return 0;
 }
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index 890a591..0a9eccf 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -416,4 +416,7 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
 		clear_thread_flag(TIF_NOTIFY_RESUME);
 		tracehook_notify_resume(regs);
 	}
+
+	if (thread_flags & _TIF_FOREIGN_FPSTATE)
+		fpsimd_reload_fpstate();
 }
