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vmci_driver.c


products/Sources/formale Sprachen/C/Linux/drivers/misc/vmw_vmci/vmci_driver.c

// SPDX-License-Identifier: GPL-2.0-only /* * VMware VMCI Driver * * Copyright (C) 2012 VMware, Inc. All rights reserved. */ #include #include #include #include #include #include #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");

                                                                                                                                                                                                                                                                                                                                                                                                     

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