177 lines
4.1 KiB
C
177 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VMware VMCI Driver
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*
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* Copyright (C) 2012 VMware, Inc. All rights reserved.
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*/
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#include <linux/vmw_vmci_defs.h>
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#include <linux/vmw_vmci_api.h>
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#include <linux/atomic.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include "vmci_driver.h"
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#include "vmci_event.h"
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static bool vmci_disable_host;
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module_param_named(disable_host, vmci_disable_host, bool, 0);
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MODULE_PARM_DESC(disable_host,
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"Disable driver host personality (default=enabled)");
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static bool vmci_disable_guest;
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module_param_named(disable_guest, vmci_disable_guest, bool, 0);
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MODULE_PARM_DESC(disable_guest,
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"Disable driver guest personality (default=enabled)");
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static bool vmci_guest_personality_initialized;
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static bool vmci_host_personality_initialized;
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static DEFINE_MUTEX(vmci_vsock_mutex); /* protects vmci_vsock_transport_cb */
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static vmci_vsock_cb vmci_vsock_transport_cb;
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static bool vmci_vsock_cb_host_called;
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/*
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* vmci_get_context_id() - Gets the current context ID.
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*
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* Returns the current context ID. Note that since this is accessed only
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* from code running in the host, this always returns the host context ID.
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*/
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u32 vmci_get_context_id(void)
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{
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if (vmci_guest_code_active())
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return vmci_get_vm_context_id();
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else if (vmci_host_code_active())
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return VMCI_HOST_CONTEXT_ID;
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return VMCI_INVALID_ID;
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}
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EXPORT_SYMBOL_GPL(vmci_get_context_id);
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/*
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* vmci_register_vsock_callback() - Register the VSOCK vmci_transport callback.
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*
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* The callback will be called when the first host or guest becomes active,
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* or if they are already active when this function is called.
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* To unregister the callback, call this function with NULL parameter.
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*
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* Returns 0 on success. -EBUSY if a callback is already registered.
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*/
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int vmci_register_vsock_callback(vmci_vsock_cb callback)
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{
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int err = 0;
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mutex_lock(&vmci_vsock_mutex);
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if (vmci_vsock_transport_cb && callback) {
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err = -EBUSY;
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goto out;
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}
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vmci_vsock_transport_cb = callback;
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if (!vmci_vsock_transport_cb) {
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vmci_vsock_cb_host_called = false;
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goto out;
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}
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if (vmci_guest_code_active())
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vmci_vsock_transport_cb(false);
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if (vmci_host_users() > 0) {
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vmci_vsock_cb_host_called = true;
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vmci_vsock_transport_cb(true);
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}
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out:
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mutex_unlock(&vmci_vsock_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(vmci_register_vsock_callback);
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void vmci_call_vsock_callback(bool is_host)
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{
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mutex_lock(&vmci_vsock_mutex);
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if (!vmci_vsock_transport_cb)
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goto out;
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/* In the host, this function could be called multiple times,
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* but we want to register it only once.
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*/
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if (is_host) {
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if (vmci_vsock_cb_host_called)
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goto out;
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vmci_vsock_cb_host_called = true;
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}
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vmci_vsock_transport_cb(is_host);
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out:
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mutex_unlock(&vmci_vsock_mutex);
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}
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static int __init vmci_drv_init(void)
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{
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int vmci_err;
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int error;
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vmci_err = vmci_event_init();
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if (vmci_err < VMCI_SUCCESS) {
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pr_err("Failed to initialize VMCIEvent (result=%d)\n",
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vmci_err);
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return -EINVAL;
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}
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if (!vmci_disable_guest) {
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error = vmci_guest_init();
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if (error) {
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pr_warn("Failed to initialize guest personality (err=%d)\n",
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error);
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} else {
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vmci_guest_personality_initialized = true;
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pr_info("Guest personality initialized and is %s\n",
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vmci_guest_code_active() ?
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"active" : "inactive");
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}
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}
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if (!vmci_disable_host) {
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error = vmci_host_init();
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if (error) {
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pr_warn("Unable to initialize host personality (err=%d)\n",
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error);
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} else {
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vmci_host_personality_initialized = true;
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pr_info("Initialized host personality\n");
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}
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}
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if (!vmci_guest_personality_initialized &&
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!vmci_host_personality_initialized) {
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vmci_event_exit();
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return -ENODEV;
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}
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return 0;
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}
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module_init(vmci_drv_init);
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static void __exit vmci_drv_exit(void)
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{
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if (vmci_guest_personality_initialized)
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vmci_guest_exit();
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if (vmci_host_personality_initialized)
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vmci_host_exit();
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vmci_event_exit();
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}
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module_exit(vmci_drv_exit);
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MODULE_AUTHOR("VMware, Inc.");
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MODULE_DESCRIPTION("VMware Virtual Machine Communication Interface.");
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MODULE_VERSION("1.1.6.0-k");
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MODULE_LICENSE("GPL v2");
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