1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/device.h>
3*4882a593Smuzhiyun #include <linux/cpu.h>
4*4882a593Smuzhiyun #include <asm/facility.h>
5*4882a593Smuzhiyun #include <asm/nospec-branch.h>
6*4882a593Smuzhiyun
cpu_show_spectre_v1(struct device * dev,struct device_attribute * attr,char * buf)7*4882a593Smuzhiyun ssize_t cpu_show_spectre_v1(struct device *dev,
8*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
9*4882a593Smuzhiyun {
10*4882a593Smuzhiyun return sprintf(buf, "Mitigation: __user pointer sanitization\n");
11*4882a593Smuzhiyun }
12*4882a593Smuzhiyun
cpu_show_spectre_v2(struct device * dev,struct device_attribute * attr,char * buf)13*4882a593Smuzhiyun ssize_t cpu_show_spectre_v2(struct device *dev,
14*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun if (test_facility(156))
17*4882a593Smuzhiyun return sprintf(buf, "Mitigation: etokens\n");
18*4882a593Smuzhiyun if (__is_defined(CC_USING_EXPOLINE) && !nospec_disable)
19*4882a593Smuzhiyun return sprintf(buf, "Mitigation: execute trampolines\n");
20*4882a593Smuzhiyun if (__test_facility(82, S390_lowcore.alt_stfle_fac_list))
21*4882a593Smuzhiyun return sprintf(buf, "Mitigation: limited branch prediction\n");
22*4882a593Smuzhiyun return sprintf(buf, "Vulnerable\n");
23*4882a593Smuzhiyun }
24