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 */
vmci_get_context_id(void)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
vmci_drv_init(void)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
vmci_drv_exit(void)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("1.1.3.0-k");
117 MODULE_LICENSE("GPL v2");
118