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-rw-r--r--arch/s390/kernel/nospec-sysfs.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/s390/kernel/nospec-sysfs.c b/arch/s390/kernel/nospec-sysfs.c
new file mode 100644
index 0000000000..52d4353188
--- /dev/null
+++ b/arch/s390/kernel/nospec-sysfs.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <asm/facility.h>
+#include <asm/nospec-branch.h>
+
+ssize_t cpu_show_spectre_v1(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+}
+
+ssize_t cpu_show_spectre_v2(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (test_facility(156))
+ return sprintf(buf, "Mitigation: etokens\n");
+ if (nospec_uses_trampoline())
+ return sprintf(buf, "Mitigation: execute trampolines\n");
+ if (__test_facility(82, alt_stfle_fac_list))
+ return sprintf(buf, "Mitigation: limited branch prediction\n");
+ return sprintf(buf, "Vulnerable\n");
+}