drivers/misc/vmw_vmci/vmci_driver.c

   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
  18 static bool vmci_disable_host;
  19 module_param_named(disable_host, vmci_disable_host, bool, 0);
  20 MODULE_PARM_DESC(disable_host,
  21                  "Disable driver host personality (default=enabled)");
  22
  23 static bool vmci_disable_guest;
  24 module_param_named(disable_guest, vmci_disable_guest, bool, 0);
  25 MODULE_PARM_DESC(disable_guest,
  26                  "Disable driver guest personality (default=enabled)");
  27
  28 static bool vmci_guest_personality_initialized;
  29 static 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  */
  37 u32 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 }
  46 EXPORT_SYMBOL_GPL(vmci_get_context_id);
  47
  48 static 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 }
  92 module_init(vmci_drv_init);
  93
  94 static 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 }
 104 module_exit(vmci_drv_exit);
 105
 106 MODULE_AUTHOR("VMware, Inc.");
 107 MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
 108 MODULE_VERSION("1.1.6.0-k");
 109 MODULE_LICENSE("GPL v2");