diff options
Diffstat (limited to 'drivers/virt')
| -rw-r--r-- | drivers/virt/nitro_enclaves/ne_misc_dev.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c index dd4752b99ece..f06622b48d69 100644 --- a/drivers/virt/nitro_enclaves/ne_misc_dev.c +++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c @@ -1325,6 +1325,171 @@ static long ne_enclave_ioctl(struct file *file, unsigned int cmd, unsigned long } /** + * ne_enclave_remove_all_mem_region_entries() - Remove all memory region entries + * from the enclave data structure. + * @ne_enclave : Private data associated with the current enclave. + * + * Context: Process context. This function is called with the ne_enclave mutex held. + */ +static void ne_enclave_remove_all_mem_region_entries(struct ne_enclave *ne_enclave) +{ + unsigned long i = 0; + struct ne_mem_region *ne_mem_region = NULL; + struct ne_mem_region *ne_mem_region_tmp = NULL; + + list_for_each_entry_safe(ne_mem_region, ne_mem_region_tmp, + &ne_enclave->mem_regions_list, + mem_region_list_entry) { + list_del(&ne_mem_region->mem_region_list_entry); + + for (i = 0; i < ne_mem_region->nr_pages; i++) + put_page(ne_mem_region->pages[i]); + + kfree(ne_mem_region->pages); + + kfree(ne_mem_region); + } +} + +/** + * ne_enclave_remove_all_vcpu_id_entries() - Remove all vCPU id entries from + * the enclave data structure. + * @ne_enclave : Private data associated with the current enclave. + * + * Context: Process context. This function is called with the ne_enclave mutex held. + */ +static void ne_enclave_remove_all_vcpu_id_entries(struct ne_enclave *ne_enclave) +{ + unsigned int cpu = 0; + unsigned int i = 0; + + mutex_lock(&ne_cpu_pool.mutex); + + for (i = 0; i < ne_enclave->nr_parent_vm_cores; i++) { + for_each_cpu(cpu, ne_enclave->threads_per_core[i]) + /* Update the available NE CPU pool. */ + cpumask_set_cpu(cpu, ne_cpu_pool.avail_threads_per_core[i]); + + free_cpumask_var(ne_enclave->threads_per_core[i]); + } + + mutex_unlock(&ne_cpu_pool.mutex); + + kfree(ne_enclave->threads_per_core); + + free_cpumask_var(ne_enclave->vcpu_ids); +} + +/** + * ne_pci_dev_remove_enclave_entry() - Remove the enclave entry from the data + * structure that is part of the NE PCI + * device private data. + * @ne_enclave : Private data associated with the current enclave. + * @ne_pci_dev : Private data associated with the PCI device. + * + * Context: Process context. This function is called with the ne_pci_dev enclave + * mutex held. + */ +static void ne_pci_dev_remove_enclave_entry(struct ne_enclave *ne_enclave, + struct ne_pci_dev *ne_pci_dev) +{ + struct ne_enclave *ne_enclave_entry = NULL; + struct ne_enclave *ne_enclave_entry_tmp = NULL; + + list_for_each_entry_safe(ne_enclave_entry, ne_enclave_entry_tmp, + &ne_pci_dev->enclaves_list, enclave_list_entry) { + if (ne_enclave_entry->slot_uid == ne_enclave->slot_uid) { + list_del(&ne_enclave_entry->enclave_list_entry); + + break; + } + } +} + +/** + * ne_enclave_release() - Release function provided by the enclave file. + * @inode: Inode associated with this file release function. + * @file: File associated with this release function. + * + * Context: Process context. + * Return: + * * 0 on success. + * * Negative return value on failure. + */ +static int ne_enclave_release(struct inode *inode, struct file *file) +{ + struct ne_pci_dev_cmd_reply cmd_reply = {}; + struct enclave_stop_req enclave_stop_request = {}; + struct ne_enclave *ne_enclave = file->private_data; + struct ne_pci_dev *ne_pci_dev = ne_devs.ne_pci_dev; + struct pci_dev *pdev = ne_pci_dev->pdev; + int rc = -EINVAL; + struct slot_free_req slot_free_req = {}; + + if (!ne_enclave) + return 0; + + /* + * Early exit in case there is an error in the enclave creation logic + * and fput() is called on the cleanup path. + */ + if (!ne_enclave->slot_uid) + return 0; + + /* + * Acquire the enclave list mutex before the enclave mutex + * in order to avoid deadlocks with @ref ne_event_work_handler. + */ + mutex_lock(&ne_pci_dev->enclaves_list_mutex); + mutex_lock(&ne_enclave->enclave_info_mutex); + + if (ne_enclave->state != NE_STATE_INIT && ne_enclave->state != NE_STATE_STOPPED) { + enclave_stop_request.slot_uid = ne_enclave->slot_uid; + + rc = ne_do_request(pdev, ENCLAVE_STOP, + &enclave_stop_request, sizeof(enclave_stop_request), + &cmd_reply, sizeof(cmd_reply)); + if (rc < 0) { + dev_err_ratelimited(ne_misc_dev.this_device, + "Error in enclave stop [rc=%d]\n", rc); + + goto unlock_mutex; + } + + memset(&cmd_reply, 0, sizeof(cmd_reply)); + } + + slot_free_req.slot_uid = ne_enclave->slot_uid; + + rc = ne_do_request(pdev, SLOT_FREE, + &slot_free_req, sizeof(slot_free_req), + &cmd_reply, sizeof(cmd_reply)); + if (rc < 0) { + dev_err_ratelimited(ne_misc_dev.this_device, + "Error in slot free [rc=%d]\n", rc); + + goto unlock_mutex; + } + + ne_pci_dev_remove_enclave_entry(ne_enclave, ne_pci_dev); + ne_enclave_remove_all_mem_region_entries(ne_enclave); + ne_enclave_remove_all_vcpu_id_entries(ne_enclave); + + mutex_unlock(&ne_enclave->enclave_info_mutex); + mutex_unlock(&ne_pci_dev->enclaves_list_mutex); + + kfree(ne_enclave); + + return 0; + +unlock_mutex: + mutex_unlock(&ne_enclave->enclave_info_mutex); + mutex_unlock(&ne_pci_dev->enclaves_list_mutex); + + return rc; +} + +/** * ne_enclave_poll() - Poll functionality used for enclave out-of-band events. * @file: File associated with this poll function. * @wait: Poll table data structure. @@ -1353,6 +1518,7 @@ static const struct file_operations ne_enclave_fops = { .llseek = noop_llseek, .poll = ne_enclave_poll, .unlocked_ioctl = ne_enclave_ioctl, + .release = ne_enclave_release, }; /** |