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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * VMware VMCI Driver
4 *
5 * Copyright (C) 2012 VMware, Inc. All rights reserved.
6 */
7
8#include <linux/vmw_vmci_defs.h>
9#include <linux/vmw_vmci_api.h>
10#include <linux/atomic.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14
15#include "vmci_driver.h"
16#include "vmci_event.h"
17
18static bool vmci_disable_host;
19module_param_named(disable_host, vmci_disable_host, bool, 0);
20MODULE_PARM_DESC(disable_host,
21 "Disable driver host personality (default=enabled)");
22
23static bool vmci_disable_guest;
24module_param_named(disable_guest, vmci_disable_guest, bool, 0);
25MODULE_PARM_DESC(disable_guest,
26 "Disable driver guest personality (default=enabled)");
27
28static bool vmci_guest_personality_initialized;
29static bool vmci_host_personality_initialized;
30
31static DEFINE_MUTEX(vmci_vsock_mutex); /* protects vmci_vsock_transport_cb */
32static vmci_vsock_cb vmci_vsock_transport_cb;
33static bool vmci_vsock_cb_host_called;
34
35/*
36 * vmci_get_context_id() - Gets the current context ID.
37 *
38 * Returns the current context ID. Note that since this is accessed only
39 * from code running in the host, this always returns the host context ID.
40 */
41u32 vmci_get_context_id(void)
42{
43 if (vmci_guest_code_active())
44 return vmci_get_vm_context_id();
45 else if (vmci_host_code_active())
46 return VMCI_HOST_CONTEXT_ID;
47
48 return VMCI_INVALID_ID;
49}
50EXPORT_SYMBOL_GPL(vmci_get_context_id);
51
52/*
53 * vmci_register_vsock_callback() - Register the VSOCK vmci_transport callback.
54 *
55 * The callback will be called when the first host or guest becomes active,
56 * or if they are already active when this function is called.
57 * To unregister the callback, call this function with NULL parameter.
58 *
59 * Returns 0 on success. -EBUSY if a callback is already registered.
60 */
61int vmci_register_vsock_callback(vmci_vsock_cb callback)
62{
63 int err = 0;
64
65 mutex_lock(&vmci_vsock_mutex);
66
67 if (vmci_vsock_transport_cb && callback) {
68 err = -EBUSY;
69 goto out;
70 }
71
72 vmci_vsock_transport_cb = callback;
73
74 if (!vmci_vsock_transport_cb) {
75 vmci_vsock_cb_host_called = false;
76 goto out;
77 }
78
79 if (vmci_guest_code_active())
80 vmci_vsock_transport_cb(false);
81
82 if (vmci_host_users() > 0) {
83 vmci_vsock_cb_host_called = true;
84 vmci_vsock_transport_cb(true);
85 }
86
87out:
88 mutex_unlock(&vmci_vsock_mutex);
89 return err;
90}
91EXPORT_SYMBOL_GPL(vmci_register_vsock_callback);
92
93void vmci_call_vsock_callback(bool is_host)
94{
95 mutex_lock(&vmci_vsock_mutex);
96
97 if (!vmci_vsock_transport_cb)
98 goto out;
99
100 /* In the host, this function could be called multiple times,
101 * but we want to register it only once.
102 */
103 if (is_host) {
104 if (vmci_vsock_cb_host_called)
105 goto out;
106
107 vmci_vsock_cb_host_called = true;
108 }
109
110 vmci_vsock_transport_cb(is_host);
111out:
112 mutex_unlock(&vmci_vsock_mutex);
113}
114
115static int __init vmci_drv_init(void)
116{
117 int vmci_err;
118 int error;
119
120 vmci_err = vmci_event_init();
121 if (vmci_err < VMCI_SUCCESS) {
122 pr_err("Failed to initialize VMCIEvent (result=%d)\n",
123 vmci_err);
124 return -EINVAL;
125 }
126
127 if (!vmci_disable_guest) {
128 error = vmci_guest_init();
129 if (error) {
130 pr_warn("Failed to initialize guest personality (err=%d)\n",
131 error);
132 } else {
133 vmci_guest_personality_initialized = true;
134 pr_info("Guest personality initialized and is %s\n",
135 vmci_guest_code_active() ?
136 "active" : "inactive");
137 }
138 }
139
140 if (!vmci_disable_host) {
141 error = vmci_host_init();
142 if (error) {
143 pr_warn("Unable to initialize host personality (err=%d)\n",
144 error);
145 } else {
146 vmci_host_personality_initialized = true;
147 pr_info("Initialized host personality\n");
148 }
149 }
150
151 if (!vmci_guest_personality_initialized &&
152 !vmci_host_personality_initialized) {
153 vmci_event_exit();
154 return -ENODEV;
155 }
156
157 return 0;
158}
159module_init(vmci_drv_init);
160
161static void __exit vmci_drv_exit(void)
162{
163 if (vmci_guest_personality_initialized)
164 vmci_guest_exit();
165
166 if (vmci_host_personality_initialized)
167 vmci_host_exit();
168
169 vmci_event_exit();
170}
171module_exit(vmci_drv_exit);
172
173MODULE_AUTHOR("VMware, Inc.");
174MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
175MODULE_VERSION("1.1.6.0-k");
176MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * VMware VMCI Driver
4 *
5 * Copyright (C) 2012 VMware, Inc. All rights reserved.
6 */
7
8#include <linux/vmw_vmci_defs.h>
9#include <linux/vmw_vmci_api.h>
10#include <linux/atomic.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/init.h>
14
15#include "vmci_driver.h"
16#include "vmci_event.h"
17
18static bool vmci_disable_host;
19module_param_named(disable_host, vmci_disable_host, bool, 0);
20MODULE_PARM_DESC(disable_host,
21 "Disable driver host personality (default=enabled)");
22
23static bool vmci_disable_guest;
24module_param_named(disable_guest, vmci_disable_guest, bool, 0);
25MODULE_PARM_DESC(disable_guest,
26 "Disable driver guest personality (default=enabled)");
27
28static bool vmci_guest_personality_initialized;
29static bool vmci_host_personality_initialized;
30
31/*
32 * vmci_get_context_id() - Gets the current context ID.
33 *
34 * Returns the current context ID. Note that since this is accessed only
35 * from code running in the host, this always returns the host context ID.
36 */
37u32 vmci_get_context_id(void)
38{
39 if (vmci_guest_code_active())
40 return vmci_get_vm_context_id();
41 else if (vmci_host_code_active())
42 return VMCI_HOST_CONTEXT_ID;
43
44 return VMCI_INVALID_ID;
45}
46EXPORT_SYMBOL_GPL(vmci_get_context_id);
47
48static int __init vmci_drv_init(void)
49{
50 int vmci_err;
51 int error;
52
53 vmci_err = vmci_event_init();
54 if (vmci_err < VMCI_SUCCESS) {
55 pr_err("Failed to initialize VMCIEvent (result=%d)\n",
56 vmci_err);
57 return -EINVAL;
58 }
59
60 if (!vmci_disable_guest) {
61 error = vmci_guest_init();
62 if (error) {
63 pr_warn("Failed to initialize guest personality (err=%d)\n",
64 error);
65 } else {
66 vmci_guest_personality_initialized = true;
67 pr_info("Guest personality initialized and is %s\n",
68 vmci_guest_code_active() ?
69 "active" : "inactive");
70 }
71 }
72
73 if (!vmci_disable_host) {
74 error = vmci_host_init();
75 if (error) {
76 pr_warn("Unable to initialize host personality (err=%d)\n",
77 error);
78 } else {
79 vmci_host_personality_initialized = true;
80 pr_info("Initialized host personality\n");
81 }
82 }
83
84 if (!vmci_guest_personality_initialized &&
85 !vmci_host_personality_initialized) {
86 vmci_event_exit();
87 return -ENODEV;
88 }
89
90 return 0;
91}
92module_init(vmci_drv_init);
93
94static void __exit vmci_drv_exit(void)
95{
96 if (vmci_guest_personality_initialized)
97 vmci_guest_exit();
98
99 if (vmci_host_personality_initialized)
100 vmci_host_exit();
101
102 vmci_event_exit();
103}
104module_exit(vmci_drv_exit);
105
106MODULE_AUTHOR("VMware, Inc.");
107MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
108MODULE_VERSION("1.1.6.0-k");
109MODULE_LICENSE("GPL v2");