1 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s32/kuap.c b/arch/powerpc/mm/book3s32/kuap.c
new file mode 100644
index 000000000000..3a8815555a48
--- /dev/null
+++ b/arch/powerpc/mm/book3s32/kuap.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <asm/kup.h>
+#include <asm/smp.h>
+
+void setup_kuap(bool disabled)
+{
+	if (!disabled) {
+		update_user_segments(mfsr(0) | SR_KS);
+		isync();        /* Context sync required after mtsr() */
+		init_mm.context.sr0 |= SR_KS;
+		current->thread.sr0 |= SR_KS;
+	}
+
+	if (smp_processor_id() != boot_cpuid)
+		return;
+
+	if (disabled)
+		cur_cpu_spec->mmu_features &= ~MMU_FTR_KUAP;
+	else
+		pr_info("Activating Kernel Userspace Access Protection\n");
+}