LXR linux/arch/s390/kernel/nospec-sysfs.c

   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
   7ssize_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
  13ssize_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, "Mitigation: etokens\n");
  18        if (__is_defined(CC_USING_EXPOLINE) && !nospec_disable)
  19                return sprintf(buf, "Mitigation: execute trampolines\n");
  20        if (__test_facility(82, alt_stfle_fac_list))
  21                return sprintf(buf, "Mitigation: limited branch prediction\n");
  22        return sprintf(buf, "Vulnerable\n");
  23}
  24