tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AMD SVM-SEV command line parsing support
4 *
5 * Copyright (C) 2023 - 2024 Advanced Micro Devices, Inc.
6 *
7 * Author: Michael Roth <michael.roth@amd.com>
8 */
9
10#include <linux/string.h>
11#include <linux/printk.h>
12#include <linux/cache.h>
13#include <linux/cpufeature.h>
14
15#include <asm/sev-common.h>
16
17struct sev_config sev_cfg __read_mostly;
18
19static int __init init_sev_config(char *str)
20{
21 char *s;
22
23 while ((s = strsep(&str, ","))) {
24 if (!strcmp(s, "debug")) {
25 sev_cfg.debug = true;
26 continue;
27 }
28
29 if (!strcmp(s, "nosnp")) {
30 if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) {
31 setup_clear_cpu_cap(X86_FEATURE_SEV_SNP);
32 cc_platform_clear(CC_ATTR_HOST_SEV_SNP);
33 continue;
34 } else {
35 goto warn;
36 }
37 }
38
39warn:
40 pr_info("SEV command-line option '%s' was not recognized\n", s);
41 }
42
43 return 1;
44}
45__setup("sev=", init_sev_config);