// SPDX-License-Identifier: GPL-2.0-only
/*
 * AMD SVM-SEV command line parsing support
 *
 * Copyright (C) 2023 - 2024 Advanced Micro Devices, Inc.
 *
 * Author: Michael Roth <michael.roth@amd.com>
 */

#include <linux/string.h>
#include <linux/printk.h>
#include <linux/cache.h>
#include <linux/cpufeature.h>

#include <asm/sev-common.h>

struct sev_config sev_cfg __read_mostly;

static int __init init_sev_config(char *str)
{
        char *s;

        while ((s = strsep(&str, ","))) {
                if (!strcmp(s, "debug")) {
                        sev_cfg.debug = true;
                        continue;
                }

                if (!strcmp(s, "nosnp")) {
                        if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) {
                                setup_clear_cpu_cap(X86_FEATURE_SEV_SNP);
                                cc_platform_clear(CC_ATTR_HOST_SEV_SNP);
                                continue;
                        } else {
                                goto warn;
                        }
                }

warn:
                pr_info("SEV command-line option '%s' was not recognized\n", s);
        }

        return 1;
}
__setup("sev=", init_sev_config);