| 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 | |
| 17 | struct sev_config sev_cfg __read_mostly; |
| 18 | |
| 19 | static 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(attr: CC_ATTR_HOST_SEV_SNP); |
| 33 | continue; |
| 34 | } else { |
| 35 | goto warn; |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | warn: |
| 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); |
| 46 |