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