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// 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);
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