diff --git a/arch/microblaze/kernel/ptrace.c b/arch/microblaze/kernel/ptrace.c
index 236264e932d6..ac1f0503216b 100644
--- a/arch/microblaze/kernel/ptrace.c
+++ b/arch/microblaze/kernel/ptrace.c
@@ -101,6 +101,9 @@ long arch_ptrace(struct task_struct *child, long request,
 			} else {
 				rval = -EIO;
 			}
+		} else if (request == PTRACE_POKEUSR &&
+			   (addr == PT_MSR || addr == PT_MODE)) {
+			rval = -EIO;
 		} else if (addr < PT_SIZE && (addr & 0x3) == 0) {
 			microblaze_reg_t *reg_addr = reg_save_addr(addr, child);
 			if (request == PTRACE_PEEKUSR)