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 sprintf(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 sprintf(buf, fmt: "Mitigation: etokens\n" ); |
18 | if (nospec_uses_trampoline()) |
19 | return sprintf(buf, fmt: "Mitigation: execute trampolines\n" ); |
20 | if (__test_facility(82, alt_stfle_fac_list)) |
21 | return sprintf(buf, fmt: "Mitigation: limited branch prediction\n" ); |
22 | return sprintf(buf, fmt: "Vulnerable\n" ); |
23 | } |
24 | |