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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * VMware VMCI Driver4 *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/miscdevice.h>11#include <linux/interrupt.h>12#include <linux/highmem.h>13#include <linux/atomic.h>14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/mutex.h>17#include <linux/sched.h>18#include <linux/cred.h>19#include <linux/slab.h>20#include <linux/file.h>21#include <linux/init.h>22#include <linux/poll.h>23#include <linux/pci.h>24#include <linux/smp.h>25#include <linux/fs.h>26#include <linux/io.h>27 28#include "vmci_handle_array.h"29#include "vmci_queue_pair.h"30#include "vmci_datagram.h"31#include "vmci_doorbell.h"32#include "vmci_resource.h"33#include "vmci_context.h"34#include "vmci_driver.h"35#include "vmci_event.h"36 37#define VMCI_UTIL_NUM_RESOURCES 138 39enum {40 VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,41 VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,42};43 44enum {45 VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,46 VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,47 VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,48};49 50/*51 * VMCI driver initialization. This block can also be used to52 * pass initial group membership etc.53 */54struct vmci_init_blk {55 u32 cid;56 u32 flags;57};58 59/* VMCIqueue_pairAllocInfo_VMToVM */60struct vmci_qp_alloc_info_vmvm {61 struct vmci_handle handle;62 u32 peer;63 u32 flags;64 u64 produce_size;65 u64 consume_size;66 u64 produce_page_file; /* User VA. */67 u64 consume_page_file; /* User VA. */68 u64 produce_page_file_size; /* Size of the file name array. */69 u64 consume_page_file_size; /* Size of the file name array. */70 s32 result;71 u32 _pad;72};73 74/* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */75struct vmci_set_notify_info {76 u64 notify_uva;77 s32 result;78 u32 _pad;79};80 81/*82 * Per-instance host state83 */84struct vmci_host_dev {85 struct vmci_ctx *context;86 int user_version;87 enum vmci_obj_type ct_type;88 struct mutex lock; /* Mutex lock for vmci context access */89};90 91static struct vmci_ctx *host_context;92static bool vmci_host_device_initialized;93static atomic_t vmci_host_active_users = ATOMIC_INIT(0);94 95/*96 * Determines whether the VMCI host personality is97 * available. Since the core functionality of the host driver is98 * always present, all guests could possibly use the host99 * personality. However, to minimize the deviation from the100 * pre-unified driver state of affairs, we only consider the host101 * device active if there is no active guest device or if there102 * are VMX'en with active VMCI contexts using the host device.103 */104bool vmci_host_code_active(void)105{106 return vmci_host_device_initialized &&107 (!vmci_guest_code_active() ||108 atomic_read(&vmci_host_active_users) > 0);109}110 111int vmci_host_users(void)112{113 return atomic_read(&vmci_host_active_users);114}115 116/*117 * Called on open of /dev/vmci.118 */119static int vmci_host_open(struct inode *inode, struct file *filp)120{121 struct vmci_host_dev *vmci_host_dev;122 123 vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);124 if (vmci_host_dev == NULL)125 return -ENOMEM;126 127 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;128 mutex_init(&vmci_host_dev->lock);129 filp->private_data = vmci_host_dev;130 131 return 0;132}133 134/*135 * Called on close of /dev/vmci, most often when the process136 * exits.137 */138static int vmci_host_close(struct inode *inode, struct file *filp)139{140 struct vmci_host_dev *vmci_host_dev = filp->private_data;141 142 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {143 vmci_ctx_destroy(vmci_host_dev->context);144 vmci_host_dev->context = NULL;145 146 /*147 * The number of active contexts is used to track whether any148 * VMX'en are using the host personality. It is incremented when149 * a context is created through the IOCTL_VMCI_INIT_CONTEXT150 * ioctl.151 */152 atomic_dec(&vmci_host_active_users);153 }154 vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;155 156 kfree(vmci_host_dev);157 filp->private_data = NULL;158 return 0;159}160 161/*162 * This is used to wake up the VMX when a VMCI call arrives, or163 * to wake up select() or poll() at the next clock tick.164 */165static __poll_t vmci_host_poll(struct file *filp, poll_table *wait)166{167 struct vmci_host_dev *vmci_host_dev = filp->private_data;168 struct vmci_ctx *context;169 __poll_t mask = 0;170 171 if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {172 /*173 * Read context only if ct_type == VMCIOBJ_CONTEXT to make174 * sure that context is initialized175 */176 context = vmci_host_dev->context;177 178 /* Check for VMCI calls to this VM context. */179 if (wait)180 poll_wait(filp, &context->host_context.wait_queue,181 wait);182 183 spin_lock(&context->lock);184 if (context->pending_datagrams > 0 ||185 vmci_handle_arr_get_size(186 context->pending_doorbell_array) > 0) {187 mask = EPOLLIN;188 }189 spin_unlock(&context->lock);190 }191 return mask;192}193 194/*195 * Copies the handles of a handle array into a user buffer, and196 * returns the new length in userBufferSize. If the copy to the197 * user buffer fails, the functions still returns VMCI_SUCCESS,198 * but retval != 0.199 */200static int drv_cp_harray_to_user(void __user *user_buf_uva,201 u64 *user_buf_size,202 struct vmci_handle_arr *handle_array,203 int *retval)204{205 u32 array_size = 0;206 struct vmci_handle *handles;207 208 if (handle_array)209 array_size = vmci_handle_arr_get_size(handle_array);210 211 if (array_size * sizeof(*handles) > *user_buf_size)212 return VMCI_ERROR_MORE_DATA;213 214 *user_buf_size = array_size * sizeof(*handles);215 if (*user_buf_size)216 *retval = copy_to_user(user_buf_uva,217 vmci_handle_arr_get_handles218 (handle_array), *user_buf_size);219 220 return VMCI_SUCCESS;221}222 223/*224 * Sets up a given context for notify to work. Maps the notify225 * boolean in user VA into kernel space.226 */227static int vmci_host_setup_notify(struct vmci_ctx *context,228 unsigned long uva)229{230 int retval;231 232 if (context->notify_page) {233 pr_devel("%s: Notify mechanism is already set up\n", __func__);234 return VMCI_ERROR_DUPLICATE_ENTRY;235 }236 237 /*238 * We are using 'bool' internally, but let's make sure we explicit239 * about the size.240 */241 BUILD_BUG_ON(sizeof(bool) != sizeof(u8));242 243 /*244 * Lock physical page backing a given user VA.245 */246 retval = get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);247 if (retval != 1) {248 context->notify_page = NULL;249 return VMCI_ERROR_GENERIC;250 }251 if (context->notify_page == NULL)252 return VMCI_ERROR_UNAVAILABLE;253 254 /*255 * Map the locked page and set up notify pointer.256 */257 context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));258 vmci_ctx_check_signal_notify(context);259 260 return VMCI_SUCCESS;261}262 263static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,264 unsigned int cmd, void __user *uptr)265{266 if (cmd == IOCTL_VMCI_VERSION2) {267 int __user *vptr = uptr;268 if (get_user(vmci_host_dev->user_version, vptr))269 return -EFAULT;270 }271 272 /*273 * The basic logic here is:274 *275 * If the user sends in a version of 0 tell it our version.276 * If the user didn't send in a version, tell it our version.277 * If the user sent in an old version, tell it -its- version.278 * If the user sent in an newer version, tell it our version.279 *280 * The rationale behind telling the caller its version is that281 * Workstation 6.5 required that VMX and VMCI kernel module were282 * version sync'd. All new VMX users will be programmed to283 * handle the VMCI kernel module version.284 */285 286 if (vmci_host_dev->user_version > 0 &&287 vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {288 return vmci_host_dev->user_version;289 }290 291 return VMCI_VERSION;292}293 294#define vmci_ioctl_err(fmt, ...) \295 pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)296 297static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,298 const char *ioctl_name,299 void __user *uptr)300{301 struct vmci_init_blk init_block;302 const struct cred *cred;303 int retval;304 305 if (copy_from_user(&init_block, uptr, sizeof(init_block))) {306 vmci_ioctl_err("error reading init block\n");307 return -EFAULT;308 }309 310 mutex_lock(&vmci_host_dev->lock);311 312 if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {313 vmci_ioctl_err("received VMCI init on initialized handle\n");314 retval = -EINVAL;315 goto out;316 }317 318 if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {319 vmci_ioctl_err("unsupported VMCI restriction flag\n");320 retval = -EINVAL;321 goto out;322 }323 324 cred = get_current_cred();325 vmci_host_dev->context = vmci_ctx_create(init_block.cid,326 init_block.flags, 0,327 vmci_host_dev->user_version,328 cred);329 put_cred(cred);330 if (IS_ERR(vmci_host_dev->context)) {331 retval = PTR_ERR(vmci_host_dev->context);332 vmci_ioctl_err("error initializing context\n");333 goto out;334 }335 336 /*337 * Copy cid to userlevel, we do this to allow the VMX338 * to enforce its policy on cid generation.339 */340 init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);341 if (copy_to_user(uptr, &init_block, sizeof(init_block))) {342 vmci_ctx_destroy(vmci_host_dev->context);343 vmci_host_dev->context = NULL;344 vmci_ioctl_err("error writing init block\n");345 retval = -EFAULT;346 goto out;347 }348 349 vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;350 atomic_inc(&vmci_host_active_users);351 352 vmci_call_vsock_callback(true);353 354 retval = 0;355 356out:357 mutex_unlock(&vmci_host_dev->lock);358 return retval;359}360 361static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,362 const char *ioctl_name,363 void __user *uptr)364{365 struct vmci_datagram_snd_rcv_info send_info;366 struct vmci_datagram *dg = NULL;367 u32 cid;368 369 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {370 vmci_ioctl_err("only valid for contexts\n");371 return -EINVAL;372 }373 374 if (copy_from_user(&send_info, uptr, sizeof(send_info)))375 return -EFAULT;376 377 if (send_info.len > VMCI_MAX_DG_SIZE) {378 vmci_ioctl_err("datagram is too big (size=%d)\n",379 send_info.len);380 return -EINVAL;381 }382 383 if (send_info.len < sizeof(*dg)) {384 vmci_ioctl_err("datagram is too small (size=%d)\n",385 send_info.len);386 return -EINVAL;387 }388 389 dg = memdup_user((void __user *)(uintptr_t)send_info.addr,390 send_info.len);391 if (IS_ERR(dg)) {392 vmci_ioctl_err(393 "cannot allocate memory to dispatch datagram\n");394 return PTR_ERR(dg);395 }396 397 if (VMCI_DG_SIZE(dg) != send_info.len) {398 vmci_ioctl_err("datagram size mismatch\n");399 kfree(dg);400 return -EINVAL;401 }402 403 pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",404 dg->dst.context, dg->dst.resource,405 dg->src.context, dg->src.resource,406 (unsigned long long)dg->payload_size);407 408 /* Get source context id. */409 cid = vmci_ctx_get_id(vmci_host_dev->context);410 send_info.result = vmci_datagram_dispatch(cid, dg, true);411 kfree(dg);412 413 return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;414}415 416static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,417 const char *ioctl_name,418 void __user *uptr)419{420 struct vmci_datagram_snd_rcv_info recv_info;421 struct vmci_datagram *dg = NULL;422 int retval;423 size_t size;424 425 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {426 vmci_ioctl_err("only valid for contexts\n");427 return -EINVAL;428 }429 430 if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))431 return -EFAULT;432 433 size = recv_info.len;434 recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,435 &size, &dg);436 437 if (recv_info.result >= VMCI_SUCCESS) {438 void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;439 retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));440 kfree(dg);441 if (retval != 0)442 return -EFAULT;443 }444 445 return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;446}447 448static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,449 const char *ioctl_name,450 void __user *uptr)451{452 struct vmci_handle handle;453 int vmci_status;454 int __user *retptr;455 456 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {457 vmci_ioctl_err("only valid for contexts\n");458 return -EINVAL;459 }460 461 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {462 struct vmci_qp_alloc_info_vmvm alloc_info;463 struct vmci_qp_alloc_info_vmvm __user *info = uptr;464 465 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))466 return -EFAULT;467 468 handle = alloc_info.handle;469 retptr = &info->result;470 471 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,472 alloc_info.peer,473 alloc_info.flags,474 VMCI_NO_PRIVILEGE_FLAGS,475 alloc_info.produce_size,476 alloc_info.consume_size,477 NULL,478 vmci_host_dev->context);479 480 if (vmci_status == VMCI_SUCCESS)481 vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;482 } else {483 struct vmci_qp_alloc_info alloc_info;484 struct vmci_qp_alloc_info __user *info = uptr;485 struct vmci_qp_page_store page_store;486 487 if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))488 return -EFAULT;489 490 handle = alloc_info.handle;491 retptr = &info->result;492 493 page_store.pages = alloc_info.ppn_va;494 page_store.len = alloc_info.num_ppns;495 496 vmci_status = vmci_qp_broker_alloc(alloc_info.handle,497 alloc_info.peer,498 alloc_info.flags,499 VMCI_NO_PRIVILEGE_FLAGS,500 alloc_info.produce_size,501 alloc_info.consume_size,502 &page_store,503 vmci_host_dev->context);504 }505 506 if (put_user(vmci_status, retptr)) {507 if (vmci_status >= VMCI_SUCCESS) {508 vmci_status = vmci_qp_broker_detach(handle,509 vmci_host_dev->context);510 }511 return -EFAULT;512 }513 514 return 0;515}516 517static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,518 const char *ioctl_name,519 void __user *uptr)520{521 struct vmci_qp_set_va_info set_va_info;522 struct vmci_qp_set_va_info __user *info = uptr;523 s32 result;524 525 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {526 vmci_ioctl_err("only valid for contexts\n");527 return -EINVAL;528 }529 530 if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {531 vmci_ioctl_err("is not allowed\n");532 return -EINVAL;533 }534 535 if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))536 return -EFAULT;537 538 if (set_va_info.va) {539 /*540 * VMX is passing down a new VA for the queue541 * pair mapping.542 */543 result = vmci_qp_broker_map(set_va_info.handle,544 vmci_host_dev->context,545 set_va_info.va);546 } else {547 /*548 * The queue pair is about to be unmapped by549 * the VMX.550 */551 result = vmci_qp_broker_unmap(set_va_info.handle,552 vmci_host_dev->context, 0);553 }554 555 return put_user(result, &info->result) ? -EFAULT : 0;556}557 558static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,559 const char *ioctl_name,560 void __user *uptr)561{562 struct vmci_qp_page_file_info page_file_info;563 struct vmci_qp_page_file_info __user *info = uptr;564 s32 result;565 566 if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||567 vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {568 vmci_ioctl_err("not supported on this VMX (version=%d)\n",569 vmci_host_dev->user_version);570 return -EINVAL;571 }572 573 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {574 vmci_ioctl_err("only valid for contexts\n");575 return -EINVAL;576 }577 578 if (copy_from_user(&page_file_info, uptr, sizeof(*info)))579 return -EFAULT;580 581 /*582 * Communicate success pre-emptively to the caller. Note that the583 * basic premise is that it is incumbent upon the caller not to look at584 * the info.result field until after the ioctl() returns. And then,585 * only if the ioctl() result indicates no error. We send up the586 * SUCCESS status before calling SetPageStore() store because failing587 * to copy up the result code means unwinding the SetPageStore().588 *589 * It turns out the logic to unwind a SetPageStore() opens a can of590 * worms. For example, if a host had created the queue_pair and a591 * guest attaches and SetPageStore() is successful but writing success592 * fails, then ... the host has to be stopped from writing (anymore)593 * data into the queue_pair. That means an additional test in the594 * VMCI_Enqueue() code path. Ugh.595 */596 597 if (put_user(VMCI_SUCCESS, &info->result)) {598 /*599 * In this case, we can't write a result field of the600 * caller's info block. So, we don't even try to601 * SetPageStore().602 */603 return -EFAULT;604 }605 606 result = vmci_qp_broker_set_page_store(page_file_info.handle,607 page_file_info.produce_va,608 page_file_info.consume_va,609 vmci_host_dev->context);610 if (result < VMCI_SUCCESS) {611 if (put_user(result, &info->result)) {612 /*613 * Note that in this case the SetPageStore()614 * call failed but we were unable to615 * communicate that to the caller (because the616 * copy_to_user() call failed). So, if we617 * simply return an error (in this case618 * -EFAULT) then the caller will know that the619 * SetPageStore failed even though we couldn't620 * put the result code in the result field and621 * indicate exactly why it failed.622 *623 * That says nothing about the issue where we624 * were once able to write to the caller's info625 * memory and now can't. Something more626 * serious is probably going on than the fact627 * that SetPageStore() didn't work.628 */629 return -EFAULT;630 }631 }632 633 return 0;634}635 636static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,637 const char *ioctl_name,638 void __user *uptr)639{640 struct vmci_qp_dtch_info detach_info;641 struct vmci_qp_dtch_info __user *info = uptr;642 s32 result;643 644 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {645 vmci_ioctl_err("only valid for contexts\n");646 return -EINVAL;647 }648 649 if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))650 return -EFAULT;651 652 result = vmci_qp_broker_detach(detach_info.handle,653 vmci_host_dev->context);654 if (result == VMCI_SUCCESS &&655 vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {656 result = VMCI_SUCCESS_LAST_DETACH;657 }658 659 return put_user(result, &info->result) ? -EFAULT : 0;660}661 662static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,663 const char *ioctl_name,664 void __user *uptr)665{666 struct vmci_ctx_info ar_info;667 struct vmci_ctx_info __user *info = uptr;668 s32 result;669 u32 cid;670 671 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {672 vmci_ioctl_err("only valid for contexts\n");673 return -EINVAL;674 }675 676 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))677 return -EFAULT;678 679 cid = vmci_ctx_get_id(vmci_host_dev->context);680 result = vmci_ctx_add_notification(cid, ar_info.remote_cid);681 682 return put_user(result, &info->result) ? -EFAULT : 0;683}684 685static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,686 const char *ioctl_name,687 void __user *uptr)688{689 struct vmci_ctx_info ar_info;690 struct vmci_ctx_info __user *info = uptr;691 u32 cid;692 int result;693 694 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {695 vmci_ioctl_err("only valid for contexts\n");696 return -EINVAL;697 }698 699 if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))700 return -EFAULT;701 702 cid = vmci_ctx_get_id(vmci_host_dev->context);703 result = vmci_ctx_remove_notification(cid,704 ar_info.remote_cid);705 706 return put_user(result, &info->result) ? -EFAULT : 0;707}708 709static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,710 const char *ioctl_name,711 void __user *uptr)712{713 struct vmci_ctx_chkpt_buf_info get_info;714 u32 cid;715 void *cpt_buf;716 int retval;717 718 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {719 vmci_ioctl_err("only valid for contexts\n");720 return -EINVAL;721 }722 723 if (copy_from_user(&get_info, uptr, sizeof(get_info)))724 return -EFAULT;725 726 cid = vmci_ctx_get_id(vmci_host_dev->context);727 get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,728 &get_info.buf_size, &cpt_buf);729 if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {730 void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;731 retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);732 kfree(cpt_buf);733 734 if (retval)735 return -EFAULT;736 }737 738 return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;739}740 741static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,742 const char *ioctl_name,743 void __user *uptr)744{745 struct vmci_ctx_chkpt_buf_info set_info;746 u32 cid;747 void *cpt_buf;748 int retval;749 750 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {751 vmci_ioctl_err("only valid for contexts\n");752 return -EINVAL;753 }754 755 if (copy_from_user(&set_info, uptr, sizeof(set_info)))756 return -EFAULT;757 758 cpt_buf = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,759 set_info.buf_size);760 if (IS_ERR(cpt_buf))761 return PTR_ERR(cpt_buf);762 763 cid = vmci_ctx_get_id(vmci_host_dev->context);764 set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,765 set_info.buf_size, cpt_buf);766 767 retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;768 769 kfree(cpt_buf);770 return retval;771}772 773static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,774 const char *ioctl_name,775 void __user *uptr)776{777 u32 __user *u32ptr = uptr;778 779 return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;780}781 782static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,783 const char *ioctl_name,784 void __user *uptr)785{786 struct vmci_set_notify_info notify_info;787 788 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {789 vmci_ioctl_err("only valid for contexts\n");790 return -EINVAL;791 }792 793 if (copy_from_user(¬ify_info, uptr, sizeof(notify_info)))794 return -EFAULT;795 796 if (notify_info.notify_uva) {797 notify_info.result =798 vmci_host_setup_notify(vmci_host_dev->context,799 notify_info.notify_uva);800 } else {801 vmci_ctx_unset_notify(vmci_host_dev->context);802 notify_info.result = VMCI_SUCCESS;803 }804 805 return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ?806 -EFAULT : 0;807}808 809static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,810 const char *ioctl_name,811 void __user *uptr)812{813 struct vmci_dbell_notify_resource_info info;814 u32 cid;815 816 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {817 vmci_ioctl_err("invalid for current VMX versions\n");818 return -EINVAL;819 }820 821 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {822 vmci_ioctl_err("only valid for contexts\n");823 return -EINVAL;824 }825 826 if (copy_from_user(&info, uptr, sizeof(info)))827 return -EFAULT;828 829 cid = vmci_ctx_get_id(vmci_host_dev->context);830 831 switch (info.action) {832 case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:833 if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {834 u32 flags = VMCI_NO_PRIVILEGE_FLAGS;835 info.result = vmci_ctx_notify_dbell(cid, info.handle,836 flags);837 } else {838 info.result = VMCI_ERROR_UNAVAILABLE;839 }840 break;841 842 case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:843 info.result = vmci_ctx_dbell_create(cid, info.handle);844 break;845 846 case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:847 info.result = vmci_ctx_dbell_destroy(cid, info.handle);848 break;849 850 default:851 vmci_ioctl_err("got unknown action (action=%d)\n",852 info.action);853 info.result = VMCI_ERROR_INVALID_ARGS;854 }855 856 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;857}858 859static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,860 const char *ioctl_name,861 void __user *uptr)862{863 struct vmci_ctx_notify_recv_info info;864 struct vmci_handle_arr *db_handle_array;865 struct vmci_handle_arr *qp_handle_array;866 void __user *ubuf;867 u32 cid;868 int retval = 0;869 870 if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {871 vmci_ioctl_err("only valid for contexts\n");872 return -EINVAL;873 }874 875 if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {876 vmci_ioctl_err("not supported for the current vmx version\n");877 return -EINVAL;878 }879 880 if (copy_from_user(&info, uptr, sizeof(info)))881 return -EFAULT;882 883 if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||884 (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {885 return -EINVAL;886 }887 888 cid = vmci_ctx_get_id(vmci_host_dev->context);889 890 info.result = vmci_ctx_rcv_notifications_get(cid,891 &db_handle_array, &qp_handle_array);892 if (info.result != VMCI_SUCCESS)893 return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;894 895 ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;896 info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,897 db_handle_array, &retval);898 if (info.result == VMCI_SUCCESS && !retval) {899 ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;900 info.result = drv_cp_harray_to_user(ubuf,901 &info.qp_handle_buf_size,902 qp_handle_array, &retval);903 }904 905 if (!retval && copy_to_user(uptr, &info, sizeof(info)))906 retval = -EFAULT;907 908 vmci_ctx_rcv_notifications_release(cid,909 db_handle_array, qp_handle_array,910 info.result == VMCI_SUCCESS && !retval);911 912 return retval;913}914 915static long vmci_host_unlocked_ioctl(struct file *filp,916 unsigned int iocmd, unsigned long ioarg)917{918#define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do { \919 char *name = "IOCTL_VMCI_" # ioctl_name; \920 return vmci_host_do_ ## ioctl_fn( \921 vmci_host_dev, name, uptr); \922 } while (0)923 924 struct vmci_host_dev *vmci_host_dev = filp->private_data;925 void __user *uptr = (void __user *)ioarg;926 927 switch (iocmd) {928 case IOCTL_VMCI_INIT_CONTEXT:929 VMCI_DO_IOCTL(INIT_CONTEXT, init_context);930 case IOCTL_VMCI_DATAGRAM_SEND:931 VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);932 case IOCTL_VMCI_DATAGRAM_RECEIVE:933 VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);934 case IOCTL_VMCI_QUEUEPAIR_ALLOC:935 VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);936 case IOCTL_VMCI_QUEUEPAIR_SETVA:937 VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);938 case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:939 VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);940 case IOCTL_VMCI_QUEUEPAIR_DETACH:941 VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);942 case IOCTL_VMCI_CTX_ADD_NOTIFICATION:943 VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);944 case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:945 VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);946 case IOCTL_VMCI_CTX_GET_CPT_STATE:947 VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);948 case IOCTL_VMCI_CTX_SET_CPT_STATE:949 VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);950 case IOCTL_VMCI_GET_CONTEXT_ID:951 VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);952 case IOCTL_VMCI_SET_NOTIFY:953 VMCI_DO_IOCTL(SET_NOTIFY, set_notify);954 case IOCTL_VMCI_NOTIFY_RESOURCE:955 VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);956 case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:957 VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);958 959 case IOCTL_VMCI_VERSION:960 case IOCTL_VMCI_VERSION2:961 return vmci_host_get_version(vmci_host_dev, iocmd, uptr);962 963 default:964 pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);965 return -EINVAL;966 }967 968#undef VMCI_DO_IOCTL969}970 971static const struct file_operations vmuser_fops = {972 .owner = THIS_MODULE,973 .open = vmci_host_open,974 .release = vmci_host_close,975 .poll = vmci_host_poll,976 .unlocked_ioctl = vmci_host_unlocked_ioctl,977 .compat_ioctl = compat_ptr_ioctl,978};979 980static struct miscdevice vmci_host_miscdev = {981 .name = "vmci",982 .minor = MISC_DYNAMIC_MINOR,983 .fops = &vmuser_fops,984};985 986int __init vmci_host_init(void)987{988 int error;989 990 host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,991 VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,992 -1, VMCI_VERSION, NULL);993 if (IS_ERR(host_context)) {994 error = PTR_ERR(host_context);995 pr_warn("Failed to initialize VMCIContext (error%d)\n",996 error);997 return error;998 }999 1000 error = misc_register(&vmci_host_miscdev);1001 if (error) {1002 pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",1003 vmci_host_miscdev.name,1004 MISC_MAJOR, vmci_host_miscdev.minor,1005 error);1006 pr_warn("Unable to initialize host personality\n");1007 vmci_ctx_destroy(host_context);1008 return error;1009 }1010 1011 pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",1012 vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);1013 1014 vmci_host_device_initialized = true;1015 return 0;1016}1017 1018void __exit vmci_host_exit(void)1019{1020 vmci_host_device_initialized = false;1021 1022 misc_deregister(&vmci_host_miscdev);1023 vmci_ctx_destroy(host_context);1024 vmci_qp_broker_exit();1025 1026 pr_debug("VMCI host driver module unloaded\n");1027}1028