Cregit: Linux 6.16: nospec-sysfs.c

Contributors: 6
Author	Tokens	Token Proportion	Commits	Commit Proportion
Martin Schwidefsky	93	86.11%	4	44.44%
Mete Durlu	5	4.63%	1	11.11%
Sebastian Ott	5	4.63%	1	11.11%
Heiko Carstens	2	1.85%	1	11.11%
Sven Schnelle	2	1.85%	1	11.11%
Greg Kroah-Hartman	1	0.93%	1	11.11%
Total	108		9

// SPDX-License-Identifier: GPL-2.0
#include <linux/device.h>
#include <linux/cpu.h>
#include <asm/facility.h>
#include <asm/nospec-branch.h>

ssize_t cpu_show_spectre_v1(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return sysfs_emit(buf, "Mitigation: __user pointer sanitization\n");
}

ssize_t cpu_show_spectre_v2(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	if (test_facility(156))
		return sysfs_emit(buf, "Mitigation: etokens\n");
	if (nospec_uses_trampoline())
		return sysfs_emit(buf, "Mitigation: execute trampolines\n");
	if (nobp_enabled())
		return sysfs_emit(buf, "Mitigation: limited branch prediction\n");
	return sysfs_emit(buf, "Vulnerable\n");
}