| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | #include <linux/device.h> |
| 3 | #include <linux/cpu.h> |
| 4 | #include <asm/facility.h> |
| 5 | #include <asm/nospec-branch.h> |
| 6 | |
| 7 | ssize_t cpu_show_spectre_v1(struct device *dev, |
| 8 | struct device_attribute *attr, char *buf) |
| 9 | { |
| 10 | return sysfs_emit(buf, fmt: "Mitigation: __user pointer sanitization\n"); |
| 11 | } |
| 12 | |
| 13 | ssize_t cpu_show_spectre_v2(struct device *dev, |
| 14 | struct device_attribute *attr, char *buf) |
| 15 | { |
| 16 | if (test_facility(156)) |
| 17 | return sysfs_emit(buf, fmt: "Mitigation: etokens\n"); |
| 18 | if (nospec_uses_trampoline()) |
| 19 | return sysfs_emit(buf, fmt: "Mitigation: execute trampolines\n"); |
| 20 | if (nobp_enabled()) |
| 21 | return sysfs_emit(buf, fmt: "Mitigation: limited branch prediction\n"); |
| 22 | return sysfs_emit(buf, fmt: "Vulnerable\n"); |
| 23 | } |
| 24 |