1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/mm/nohash/kup.c b/arch/powerpc/mm/nohash/kup.c
new file mode 100644
index 0000000000..e1f7de2e54
--- /dev/null
+++ b/arch/powerpc/mm/nohash/kup.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * This file contains the routines for initializing kernel userspace protection
+ */
+
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/printk.h>
+#include <linux/smp.h>
+
+#include <asm/kup.h>
+#include <asm/smp.h>
+
+#ifdef CONFIG_PPC_KUAP
+void setup_kuap(bool disabled)
+{
+	if (disabled) {
+		if (IS_ENABLED(CONFIG_40x))
+			disable_kuep = true;
+		if (smp_processor_id() == boot_cpuid)
+			cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP;
+		return;
+	}
+
+	pr_info("Activating Kernel Userspace Access Protection\n");
+
+	prevent_user_access(KUAP_READ_WRITE);
+}
+#endif