int __init vmci_host_init(void)
{
int error;
host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
-1, VMCI_VERSION, NULL);
if (IS_ERR(host_context)) {
error = PTR_ERR(host_context);
pr_warn("Failed to initialize VMCIContext (error%d)\n",
error);
return error;
}
error = misc_register(&vmci_host_miscdev);
if (error) {
pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
vmci_host_miscdev.name,
MISC_MAJOR, vmci_host_miscdev.minor,
error);
pr_warn("Unable to initialize host personality\n");
vmci_ctx_destroy(host_context);
return error;
}
pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
vmci_host_device_initialized = true;
return 0;
}
void __exit vmci_host_exit(void)
{
vmci_host_device_initialized = false;
misc_deregister(&vmci_host_miscdev);
vmci_ctx_destroy(host_context);
vmci_qp_broker_exit();
pr_debug("VMCI host driver module unloaded\n");
}
void __exit vmci_host_exit(void)
{
int error;
vmci_host_device_initialized = false;
error = misc_deregister(&vmci_host_miscdev);
if (error)
pr_warn("Error unregistering character device: %d\n", error);
vmci_ctx_destroy(host_context);
vmci_qp_broker_exit();
pr_debug("VMCI host driver module unloaded\n");
}
/*
* Called on close of /dev/vmci, most often when the process
* exits.
*/
static int vmci_host_close(struct inode *inode, struct file *filp)
{
struct vmci_host_dev *vmci_host_dev = filp->private_data;
if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
vmci_ctx_destroy(vmci_host_dev->context);
vmci_host_dev->context = NULL;
/*
* The number of active contexts is used to track whether any
* VMX'en are using the host personality. It is incremented when
* a context is created through the IOCTL_VMCI_INIT_CONTEXT
* ioctl.
*/
atomic_dec(&vmci_host_active_users);
}
vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
kfree(vmci_host_dev);
filp->private_data = NULL;
return 0;
}
static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
const char *ioctl_name,
void __user *uptr)
{
struct vmci_init_blk init_block;
const struct cred *cred;
int retval;
if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
vmci_ioctl_err("error reading init block\n");
return -EFAULT;
}
mutex_lock(&vmci_host_dev->lock);
if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
vmci_ioctl_err("received VMCI init on initialized handle\n");
retval = -EINVAL;
goto out;
}
if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
vmci_ioctl_err("unsupported VMCI restriction flag\n");
retval = -EINVAL;
goto out;
}
cred = get_current_cred();
vmci_host_dev->context = vmci_ctx_create(init_block.cid,
init_block.flags, 0,
vmci_host_dev->user_version,
cred);
put_cred(cred);
if (IS_ERR(vmci_host_dev->context)) {
retval = PTR_ERR(vmci_host_dev->context);
vmci_ioctl_err("error initializing context\n");
goto out;
}
/*
* Copy cid to userlevel, we do this to allow the VMX
* to enforce its policy on cid generation.
*/
init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
vmci_ctx_destroy(vmci_host_dev->context);
vmci_host_dev->context = NULL;
vmci_ioctl_err("error writing init block\n");
retval = -EFAULT;
goto out;
}
vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
atomic_inc(&vmci_host_active_users);
retval = 0;
out:
mutex_unlock(&vmci_host_dev->lock);
return retval;
}