1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2023 - Google Inc 4 * Author: Mostafa Saleh <smostafa@google.com> 5 * Simple module for pKVM SMC filtering. 6 */ 7 #include <linux/init.h> 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <asm/kvm_pkvm_module.h> 11 12 #define HYP_EVENT_FILE ../../../../drivers/misc/pkvm-smc/pkvm/events.h 13 #include <asm/kvm_define_hypevents.h> 14 15 static unsigned long pkvm_module_token; 16 int kvm_nvhe_sym(pkvm_smc_filter_hyp_init)(const struct pkvm_module_ops *ops); 17 extern int kvm_nvhe_sym(permissive); 18 19 static bool permissive; 20 module_param(permissive, bool, 0444); 21 MODULE_PARM_DESC(permissive, "Only log SMC filter violations."); 22 smc_filter_init(void)23static int __init smc_filter_init(void) 24 { 25 int ret; 26 27 kvm_nvhe_sym(permissive) = permissive; 28 ret = pkvm_load_el2_module(kvm_nvhe_sym(pkvm_smc_filter_hyp_init), 29 &pkvm_module_token); 30 if (ret) 31 pr_err("Failed to register pKVM SMC filter: %d\n", ret); 32 else 33 pr_info("pKVM SMC filter registered successfully with permissive = %s\n", 34 permissive ? "true" : "false"); 35 36 return ret; 37 } 38 39 module_init(smc_filter_init); 40 41 MODULE_AUTHOR("Mostafa Saleh <smostafa@google.com>"); 42 MODULE_DESCRIPTION("pKVM SMC filter"); 43 MODULE_LICENSE("GPL v2"); 44