cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nospec-sysfs.c (727B)

      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 (nospec_uses_trampoline())
     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}