Commit | Line | Data |
---|---|---|
4253b0e0 MS |
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, "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 (IS_ENABLED(CC_USING_EXPOLINE) && !nospec_disable) | |
17 | return sprintf(buf, "Mitigation: execute trampolines\n"); | |
18 | if (__test_facility(82, S390_lowcore.alt_stfle_fac_list)) | |
19 | return sprintf(buf, "Mitigation: limited branch prediction\n"); | |
20 | return sprintf(buf, "Vulnerable\n"); | |
21 | } |