1 /* 2 * VMware VMCI Driver 3 * 4 * Copyright (C) 2012 VMware, Inc. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation version 2 and no later version. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * for more details. 14 */ 15 16 #include <linux/vmw_vmci_defs.h> 17 #include <linux/vmw_vmci_api.h> 18 #include <linux/atomic.h> 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/init.h> 22 23 #include "vmci_driver.h" 24 #include "vmci_event.h" 25 26 static bool vmci_disable_host; 27 module_param_named(disable_host, vmci_disable_host, bool, 0); 28 MODULE_PARM_DESC(disable_host, 29 "Disable driver host personality (default=enabled)"); 30 31 static bool vmci_disable_guest; 32 module_param_named(disable_guest, vmci_disable_guest, bool, 0); 33 MODULE_PARM_DESC(disable_guest, 34 "Disable driver guest personality (default=enabled)"); 35 36 static bool vmci_guest_personality_initialized; 37 static bool vmci_host_personality_initialized; 38 39 /* 40 * vmci_get_context_id() - Gets the current context ID. 41 * 42 * Returns the current context ID. Note that since this is accessed only 43 * from code running in the host, this always returns the host context ID. 44 */ 45 u32 vmci_get_context_id(void) 46 { 47 if (vmci_guest_code_active()) 48 return vmci_get_vm_context_id(); 49 else if (vmci_host_code_active()) 50 return VMCI_HOST_CONTEXT_ID; 51 52 return VMCI_INVALID_ID; 53 } 54 EXPORT_SYMBOL_GPL(vmci_get_context_id); 55 56 static int __init vmci_drv_init(void) 57 { 58 int vmci_err; 59 int error; 60 61 vmci_err = vmci_event_init(); 62 if (vmci_err < VMCI_SUCCESS) { 63 pr_err("Failed to initialize VMCIEvent (result=%d)\n", 64 vmci_err); 65 return -EINVAL; 66 } 67 68 if (!vmci_disable_guest) { 69 error = vmci_guest_init(); 70 if (error) { 71 pr_warn("Failed to initialize guest personality (err=%d)\n", 72 error); 73 } else { 74 vmci_guest_personality_initialized = true; 75 pr_info("Guest personality initialized and is %s\n", 76 vmci_guest_code_active() ? 77 "active" : "inactive"); 78 } 79 } 80 81 if (!vmci_disable_host) { 82 error = vmci_host_init(); 83 if (error) { 84 pr_warn("Unable to initialize host personality (err=%d)\n", 85 error); 86 } else { 87 vmci_host_personality_initialized = true; 88 pr_info("Initialized host personality\n"); 89 } 90 } 91 92 if (!vmci_guest_personality_initialized && 93 !vmci_host_personality_initialized) { 94 vmci_event_exit(); 95 return -ENODEV; 96 } 97 98 return 0; 99 } 100 module_init(vmci_drv_init); 101 102 static void __exit vmci_drv_exit(void) 103 { 104 if (vmci_guest_personality_initialized) 105 vmci_guest_exit(); 106 107 if (vmci_host_personality_initialized) 108 vmci_host_exit(); 109 110 vmci_event_exit(); 111 } 112 module_exit(vmci_drv_exit); 113 114 MODULE_AUTHOR("VMware, Inc."); 115 MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface."); 116 MODULE_VERSION("1.1.5.0-k"); 117 MODULE_LICENSE("GPL v2"); 118