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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * VMware VMCI Driver
0004  *
0005  * Copyright (C) 2012 VMware, Inc. All rights reserved.
0006  */
0007 
0008 #include <linux/vmw_vmci_defs.h>
0009 #include <linux/vmw_vmci_api.h>
0010 #include <linux/miscdevice.h>
0011 #include <linux/interrupt.h>
0012 #include <linux/highmem.h>
0013 #include <linux/atomic.h>
0014 #include <linux/kernel.h>
0015 #include <linux/module.h>
0016 #include <linux/mutex.h>
0017 #include <linux/sched.h>
0018 #include <linux/cred.h>
0019 #include <linux/slab.h>
0020 #include <linux/file.h>
0021 #include <linux/init.h>
0022 #include <linux/poll.h>
0023 #include <linux/pci.h>
0024 #include <linux/smp.h>
0025 #include <linux/fs.h>
0026 #include <linux/io.h>
0027 
0028 #include "vmci_handle_array.h"
0029 #include "vmci_queue_pair.h"
0030 #include "vmci_datagram.h"
0031 #include "vmci_doorbell.h"
0032 #include "vmci_resource.h"
0033 #include "vmci_context.h"
0034 #include "vmci_driver.h"
0035 #include "vmci_event.h"
0036 
0037 #define VMCI_UTIL_NUM_RESOURCES 1
0038 
0039 enum {
0040     VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
0041     VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
0042 };
0043 
0044 enum {
0045     VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
0046     VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
0047     VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
0048 };
0049 
0050 /*
0051  * VMCI driver initialization. This block can also be used to
0052  * pass initial group membership etc.
0053  */
0054 struct vmci_init_blk {
0055     u32 cid;
0056     u32 flags;
0057 };
0058 
0059 /* VMCIqueue_pairAllocInfo_VMToVM */
0060 struct vmci_qp_alloc_info_vmvm {
0061     struct vmci_handle handle;
0062     u32 peer;
0063     u32 flags;
0064     u64 produce_size;
0065     u64 consume_size;
0066     u64 produce_page_file;    /* User VA. */
0067     u64 consume_page_file;    /* User VA. */
0068     u64 produce_page_file_size;  /* Size of the file name array. */
0069     u64 consume_page_file_size;  /* Size of the file name array. */
0070     s32 result;
0071     u32 _pad;
0072 };
0073 
0074 /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */
0075 struct vmci_set_notify_info {
0076     u64 notify_uva;
0077     s32 result;
0078     u32 _pad;
0079 };
0080 
0081 /*
0082  * Per-instance host state
0083  */
0084 struct vmci_host_dev {
0085     struct vmci_ctx *context;
0086     int user_version;
0087     enum vmci_obj_type ct_type;
0088     struct mutex lock;  /* Mutex lock for vmci context access */
0089 };
0090 
0091 static struct vmci_ctx *host_context;
0092 static bool vmci_host_device_initialized;
0093 static atomic_t vmci_host_active_users = ATOMIC_INIT(0);
0094 
0095 /*
0096  * Determines whether the VMCI host personality is
0097  * available. Since the core functionality of the host driver is
0098  * always present, all guests could possibly use the host
0099  * personality. However, to minimize the deviation from the
0100  * pre-unified driver state of affairs, we only consider the host
0101  * device active if there is no active guest device or if there
0102  * are VMX'en with active VMCI contexts using the host device.
0103  */
0104 bool vmci_host_code_active(void)
0105 {
0106     return vmci_host_device_initialized &&
0107         (!vmci_guest_code_active() ||
0108          atomic_read(&vmci_host_active_users) > 0);
0109 }
0110 
0111 int vmci_host_users(void)
0112 {
0113     return atomic_read(&vmci_host_active_users);
0114 }
0115 
0116 /*
0117  * Called on open of /dev/vmci.
0118  */
0119 static int vmci_host_open(struct inode *inode, struct file *filp)
0120 {
0121     struct vmci_host_dev *vmci_host_dev;
0122 
0123     vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
0124     if (vmci_host_dev == NULL)
0125         return -ENOMEM;
0126 
0127     vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
0128     mutex_init(&vmci_host_dev->lock);
0129     filp->private_data = vmci_host_dev;
0130 
0131     return 0;
0132 }
0133 
0134 /*
0135  * Called on close of /dev/vmci, most often when the process
0136  * exits.
0137  */
0138 static int vmci_host_close(struct inode *inode, struct file *filp)
0139 {
0140     struct vmci_host_dev *vmci_host_dev = filp->private_data;
0141 
0142     if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
0143         vmci_ctx_destroy(vmci_host_dev->context);
0144         vmci_host_dev->context = NULL;
0145 
0146         /*
0147          * The number of active contexts is used to track whether any
0148          * VMX'en are using the host personality. It is incremented when
0149          * a context is created through the IOCTL_VMCI_INIT_CONTEXT
0150          * ioctl.
0151          */
0152         atomic_dec(&vmci_host_active_users);
0153     }
0154     vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
0155 
0156     kfree(vmci_host_dev);
0157     filp->private_data = NULL;
0158     return 0;
0159 }
0160 
0161 /*
0162  * This is used to wake up the VMX when a VMCI call arrives, or
0163  * to wake up select() or poll() at the next clock tick.
0164  */
0165 static __poll_t vmci_host_poll(struct file *filp, poll_table *wait)
0166 {
0167     struct vmci_host_dev *vmci_host_dev = filp->private_data;
0168     struct vmci_ctx *context = vmci_host_dev->context;
0169     __poll_t mask = 0;
0170 
0171     if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
0172         /* Check for VMCI calls to this VM context. */
0173         if (wait)
0174             poll_wait(filp, &context->host_context.wait_queue,
0175                   wait);
0176 
0177         spin_lock(&context->lock);
0178         if (context->pending_datagrams > 0 ||
0179             vmci_handle_arr_get_size(
0180                 context->pending_doorbell_array) > 0) {
0181             mask = EPOLLIN;
0182         }
0183         spin_unlock(&context->lock);
0184     }
0185     return mask;
0186 }
0187 
0188 /*
0189  * Copies the handles of a handle array into a user buffer, and
0190  * returns the new length in userBufferSize. If the copy to the
0191  * user buffer fails, the functions still returns VMCI_SUCCESS,
0192  * but retval != 0.
0193  */
0194 static int drv_cp_harray_to_user(void __user *user_buf_uva,
0195                  u64 *user_buf_size,
0196                  struct vmci_handle_arr *handle_array,
0197                  int *retval)
0198 {
0199     u32 array_size = 0;
0200     struct vmci_handle *handles;
0201 
0202     if (handle_array)
0203         array_size = vmci_handle_arr_get_size(handle_array);
0204 
0205     if (array_size * sizeof(*handles) > *user_buf_size)
0206         return VMCI_ERROR_MORE_DATA;
0207 
0208     *user_buf_size = array_size * sizeof(*handles);
0209     if (*user_buf_size)
0210         *retval = copy_to_user(user_buf_uva,
0211                        vmci_handle_arr_get_handles
0212                        (handle_array), *user_buf_size);
0213 
0214     return VMCI_SUCCESS;
0215 }
0216 
0217 /*
0218  * Sets up a given context for notify to work. Maps the notify
0219  * boolean in user VA into kernel space.
0220  */
0221 static int vmci_host_setup_notify(struct vmci_ctx *context,
0222                   unsigned long uva)
0223 {
0224     int retval;
0225 
0226     if (context->notify_page) {
0227         pr_devel("%s: Notify mechanism is already set up\n", __func__);
0228         return VMCI_ERROR_DUPLICATE_ENTRY;
0229     }
0230 
0231     /*
0232      * We are using 'bool' internally, but let's make sure we explicit
0233      * about the size.
0234      */
0235     BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
0236 
0237     /*
0238      * Lock physical page backing a given user VA.
0239      */
0240     retval = get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);
0241     if (retval != 1) {
0242         context->notify_page = NULL;
0243         return VMCI_ERROR_GENERIC;
0244     }
0245 
0246     /*
0247      * Map the locked page and set up notify pointer.
0248      */
0249     context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
0250     vmci_ctx_check_signal_notify(context);
0251 
0252     return VMCI_SUCCESS;
0253 }
0254 
0255 static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
0256                  unsigned int cmd, void __user *uptr)
0257 {
0258     if (cmd == IOCTL_VMCI_VERSION2) {
0259         int __user *vptr = uptr;
0260         if (get_user(vmci_host_dev->user_version, vptr))
0261             return -EFAULT;
0262     }
0263 
0264     /*
0265      * The basic logic here is:
0266      *
0267      * If the user sends in a version of 0 tell it our version.
0268      * If the user didn't send in a version, tell it our version.
0269      * If the user sent in an old version, tell it -its- version.
0270      * If the user sent in an newer version, tell it our version.
0271      *
0272      * The rationale behind telling the caller its version is that
0273      * Workstation 6.5 required that VMX and VMCI kernel module were
0274      * version sync'd.  All new VMX users will be programmed to
0275      * handle the VMCI kernel module version.
0276      */
0277 
0278     if (vmci_host_dev->user_version > 0 &&
0279         vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
0280         return vmci_host_dev->user_version;
0281     }
0282 
0283     return VMCI_VERSION;
0284 }
0285 
0286 #define vmci_ioctl_err(fmt, ...)    \
0287     pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
0288 
0289 static int vmci_host_do_init_context(struct vmci_host_dev *vmci_host_dev,
0290                      const char *ioctl_name,
0291                      void __user *uptr)
0292 {
0293     struct vmci_init_blk init_block;
0294     const struct cred *cred;
0295     int retval;
0296 
0297     if (copy_from_user(&init_block, uptr, sizeof(init_block))) {
0298         vmci_ioctl_err("error reading init block\n");
0299         return -EFAULT;
0300     }
0301 
0302     mutex_lock(&vmci_host_dev->lock);
0303 
0304     if (vmci_host_dev->ct_type != VMCIOBJ_NOT_SET) {
0305         vmci_ioctl_err("received VMCI init on initialized handle\n");
0306         retval = -EINVAL;
0307         goto out;
0308     }
0309 
0310     if (init_block.flags & ~VMCI_PRIVILEGE_FLAG_RESTRICTED) {
0311         vmci_ioctl_err("unsupported VMCI restriction flag\n");
0312         retval = -EINVAL;
0313         goto out;
0314     }
0315 
0316     cred = get_current_cred();
0317     vmci_host_dev->context = vmci_ctx_create(init_block.cid,
0318                          init_block.flags, 0,
0319                          vmci_host_dev->user_version,
0320                          cred);
0321     put_cred(cred);
0322     if (IS_ERR(vmci_host_dev->context)) {
0323         retval = PTR_ERR(vmci_host_dev->context);
0324         vmci_ioctl_err("error initializing context\n");
0325         goto out;
0326     }
0327 
0328     /*
0329      * Copy cid to userlevel, we do this to allow the VMX
0330      * to enforce its policy on cid generation.
0331      */
0332     init_block.cid = vmci_ctx_get_id(vmci_host_dev->context);
0333     if (copy_to_user(uptr, &init_block, sizeof(init_block))) {
0334         vmci_ctx_destroy(vmci_host_dev->context);
0335         vmci_host_dev->context = NULL;
0336         vmci_ioctl_err("error writing init block\n");
0337         retval = -EFAULT;
0338         goto out;
0339     }
0340 
0341     vmci_host_dev->ct_type = VMCIOBJ_CONTEXT;
0342     atomic_inc(&vmci_host_active_users);
0343 
0344     vmci_call_vsock_callback(true);
0345 
0346     retval = 0;
0347 
0348 out:
0349     mutex_unlock(&vmci_host_dev->lock);
0350     return retval;
0351 }
0352 
0353 static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
0354                       const char *ioctl_name,
0355                       void __user *uptr)
0356 {
0357     struct vmci_datagram_snd_rcv_info send_info;
0358     struct vmci_datagram *dg = NULL;
0359     u32 cid;
0360 
0361     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0362         vmci_ioctl_err("only valid for contexts\n");
0363         return -EINVAL;
0364     }
0365 
0366     if (copy_from_user(&send_info, uptr, sizeof(send_info)))
0367         return -EFAULT;
0368 
0369     if (send_info.len > VMCI_MAX_DG_SIZE) {
0370         vmci_ioctl_err("datagram is too big (size=%d)\n",
0371                    send_info.len);
0372         return -EINVAL;
0373     }
0374 
0375     if (send_info.len < sizeof(*dg)) {
0376         vmci_ioctl_err("datagram is too small (size=%d)\n",
0377                    send_info.len);
0378         return -EINVAL;
0379     }
0380 
0381     dg = memdup_user((void __user *)(uintptr_t)send_info.addr,
0382              send_info.len);
0383     if (IS_ERR(dg)) {
0384         vmci_ioctl_err(
0385             "cannot allocate memory to dispatch datagram\n");
0386         return PTR_ERR(dg);
0387     }
0388 
0389     if (VMCI_DG_SIZE(dg) != send_info.len) {
0390         vmci_ioctl_err("datagram size mismatch\n");
0391         kfree(dg);
0392         return -EINVAL;
0393     }
0394 
0395     pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
0396          dg->dst.context, dg->dst.resource,
0397          dg->src.context, dg->src.resource,
0398          (unsigned long long)dg->payload_size);
0399 
0400     /* Get source context id. */
0401     cid = vmci_ctx_get_id(vmci_host_dev->context);
0402     send_info.result = vmci_datagram_dispatch(cid, dg, true);
0403     kfree(dg);
0404 
0405     return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
0406 }
0407 
0408 static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
0409                      const char *ioctl_name,
0410                      void __user *uptr)
0411 {
0412     struct vmci_datagram_snd_rcv_info recv_info;
0413     struct vmci_datagram *dg = NULL;
0414     int retval;
0415     size_t size;
0416 
0417     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0418         vmci_ioctl_err("only valid for contexts\n");
0419         return -EINVAL;
0420     }
0421 
0422     if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
0423         return -EFAULT;
0424 
0425     size = recv_info.len;
0426     recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
0427                              &size, &dg);
0428 
0429     if (recv_info.result >= VMCI_SUCCESS) {
0430         void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
0431         retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
0432         kfree(dg);
0433         if (retval != 0)
0434             return -EFAULT;
0435     }
0436 
0437     return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
0438 }
0439 
0440 static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
0441                     const char *ioctl_name,
0442                     void __user *uptr)
0443 {
0444     struct vmci_handle handle;
0445     int vmci_status;
0446     int __user *retptr;
0447 
0448     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0449         vmci_ioctl_err("only valid for contexts\n");
0450         return -EINVAL;
0451     }
0452 
0453     if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
0454         struct vmci_qp_alloc_info_vmvm alloc_info;
0455         struct vmci_qp_alloc_info_vmvm __user *info = uptr;
0456 
0457         if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
0458             return -EFAULT;
0459 
0460         handle = alloc_info.handle;
0461         retptr = &info->result;
0462 
0463         vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
0464                         alloc_info.peer,
0465                         alloc_info.flags,
0466                         VMCI_NO_PRIVILEGE_FLAGS,
0467                         alloc_info.produce_size,
0468                         alloc_info.consume_size,
0469                         NULL,
0470                         vmci_host_dev->context);
0471 
0472         if (vmci_status == VMCI_SUCCESS)
0473             vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
0474     } else {
0475         struct vmci_qp_alloc_info alloc_info;
0476         struct vmci_qp_alloc_info __user *info = uptr;
0477         struct vmci_qp_page_store page_store;
0478 
0479         if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
0480             return -EFAULT;
0481 
0482         handle = alloc_info.handle;
0483         retptr = &info->result;
0484 
0485         page_store.pages = alloc_info.ppn_va;
0486         page_store.len = alloc_info.num_ppns;
0487 
0488         vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
0489                         alloc_info.peer,
0490                         alloc_info.flags,
0491                         VMCI_NO_PRIVILEGE_FLAGS,
0492                         alloc_info.produce_size,
0493                         alloc_info.consume_size,
0494                         &page_store,
0495                         vmci_host_dev->context);
0496     }
0497 
0498     if (put_user(vmci_status, retptr)) {
0499         if (vmci_status >= VMCI_SUCCESS) {
0500             vmci_status = vmci_qp_broker_detach(handle,
0501                             vmci_host_dev->context);
0502         }
0503         return -EFAULT;
0504     }
0505 
0506     return 0;
0507 }
0508 
0509 static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
0510                     const char *ioctl_name,
0511                     void __user *uptr)
0512 {
0513     struct vmci_qp_set_va_info set_va_info;
0514     struct vmci_qp_set_va_info __user *info = uptr;
0515     s32 result;
0516 
0517     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0518         vmci_ioctl_err("only valid for contexts\n");
0519         return -EINVAL;
0520     }
0521 
0522     if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
0523         vmci_ioctl_err("is not allowed\n");
0524         return -EINVAL;
0525     }
0526 
0527     if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
0528         return -EFAULT;
0529 
0530     if (set_va_info.va) {
0531         /*
0532          * VMX is passing down a new VA for the queue
0533          * pair mapping.
0534          */
0535         result = vmci_qp_broker_map(set_va_info.handle,
0536                         vmci_host_dev->context,
0537                         set_va_info.va);
0538     } else {
0539         /*
0540          * The queue pair is about to be unmapped by
0541          * the VMX.
0542          */
0543         result = vmci_qp_broker_unmap(set_va_info.handle,
0544                      vmci_host_dev->context, 0);
0545     }
0546 
0547     return put_user(result, &info->result) ? -EFAULT : 0;
0548 }
0549 
0550 static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
0551                     const char *ioctl_name,
0552                     void __user *uptr)
0553 {
0554     struct vmci_qp_page_file_info page_file_info;
0555     struct vmci_qp_page_file_info __user *info = uptr;
0556     s32 result;
0557 
0558     if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
0559         vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
0560         vmci_ioctl_err("not supported on this VMX (version=%d)\n",
0561                    vmci_host_dev->user_version);
0562         return -EINVAL;
0563     }
0564 
0565     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0566         vmci_ioctl_err("only valid for contexts\n");
0567         return -EINVAL;
0568     }
0569 
0570     if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
0571         return -EFAULT;
0572 
0573     /*
0574      * Communicate success pre-emptively to the caller.  Note that the
0575      * basic premise is that it is incumbent upon the caller not to look at
0576      * the info.result field until after the ioctl() returns.  And then,
0577      * only if the ioctl() result indicates no error.  We send up the
0578      * SUCCESS status before calling SetPageStore() store because failing
0579      * to copy up the result code means unwinding the SetPageStore().
0580      *
0581      * It turns out the logic to unwind a SetPageStore() opens a can of
0582      * worms.  For example, if a host had created the queue_pair and a
0583      * guest attaches and SetPageStore() is successful but writing success
0584      * fails, then ... the host has to be stopped from writing (anymore)
0585      * data into the queue_pair.  That means an additional test in the
0586      * VMCI_Enqueue() code path.  Ugh.
0587      */
0588 
0589     if (put_user(VMCI_SUCCESS, &info->result)) {
0590         /*
0591          * In this case, we can't write a result field of the
0592          * caller's info block.  So, we don't even try to
0593          * SetPageStore().
0594          */
0595         return -EFAULT;
0596     }
0597 
0598     result = vmci_qp_broker_set_page_store(page_file_info.handle,
0599                         page_file_info.produce_va,
0600                         page_file_info.consume_va,
0601                         vmci_host_dev->context);
0602     if (result < VMCI_SUCCESS) {
0603         if (put_user(result, &info->result)) {
0604             /*
0605              * Note that in this case the SetPageStore()
0606              * call failed but we were unable to
0607              * communicate that to the caller (because the
0608              * copy_to_user() call failed).  So, if we
0609              * simply return an error (in this case
0610              * -EFAULT) then the caller will know that the
0611              *  SetPageStore failed even though we couldn't
0612              *  put the result code in the result field and
0613              *  indicate exactly why it failed.
0614              *
0615              * That says nothing about the issue where we
0616              * were once able to write to the caller's info
0617              * memory and now can't.  Something more
0618              * serious is probably going on than the fact
0619              * that SetPageStore() didn't work.
0620              */
0621             return -EFAULT;
0622         }
0623     }
0624 
0625     return 0;
0626 }
0627 
0628 static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
0629                   const char *ioctl_name,
0630                   void __user *uptr)
0631 {
0632     struct vmci_qp_dtch_info detach_info;
0633     struct vmci_qp_dtch_info __user *info = uptr;
0634     s32 result;
0635 
0636     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0637         vmci_ioctl_err("only valid for contexts\n");
0638         return -EINVAL;
0639     }
0640 
0641     if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
0642         return -EFAULT;
0643 
0644     result = vmci_qp_broker_detach(detach_info.handle,
0645                        vmci_host_dev->context);
0646     if (result == VMCI_SUCCESS &&
0647         vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
0648         result = VMCI_SUCCESS_LAST_DETACH;
0649     }
0650 
0651     return put_user(result, &info->result) ? -EFAULT : 0;
0652 }
0653 
0654 static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
0655                        const char *ioctl_name,
0656                        void __user *uptr)
0657 {
0658     struct vmci_ctx_info ar_info;
0659     struct vmci_ctx_info __user *info = uptr;
0660     s32 result;
0661     u32 cid;
0662 
0663     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0664         vmci_ioctl_err("only valid for contexts\n");
0665         return -EINVAL;
0666     }
0667 
0668     if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
0669         return -EFAULT;
0670 
0671     cid = vmci_ctx_get_id(vmci_host_dev->context);
0672     result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
0673 
0674     return put_user(result, &info->result) ? -EFAULT : 0;
0675 }
0676 
0677 static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
0678                       const char *ioctl_name,
0679                       void __user *uptr)
0680 {
0681     struct vmci_ctx_info ar_info;
0682     struct vmci_ctx_info __user *info = uptr;
0683     u32 cid;
0684     int result;
0685 
0686     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0687         vmci_ioctl_err("only valid for contexts\n");
0688         return -EINVAL;
0689     }
0690 
0691     if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
0692         return -EFAULT;
0693 
0694     cid = vmci_ctx_get_id(vmci_host_dev->context);
0695     result = vmci_ctx_remove_notification(cid,
0696                           ar_info.remote_cid);
0697 
0698     return put_user(result, &info->result) ? -EFAULT : 0;
0699 }
0700 
0701 static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
0702                       const char *ioctl_name,
0703                       void __user *uptr)
0704 {
0705     struct vmci_ctx_chkpt_buf_info get_info;
0706     u32 cid;
0707     void *cpt_buf;
0708     int retval;
0709 
0710     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0711         vmci_ioctl_err("only valid for contexts\n");
0712         return -EINVAL;
0713     }
0714 
0715     if (copy_from_user(&get_info, uptr, sizeof(get_info)))
0716         return -EFAULT;
0717 
0718     cid = vmci_ctx_get_id(vmci_host_dev->context);
0719     get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
0720                         &get_info.buf_size, &cpt_buf);
0721     if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
0722         void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
0723         retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
0724         kfree(cpt_buf);
0725 
0726         if (retval)
0727             return -EFAULT;
0728     }
0729 
0730     return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
0731 }
0732 
0733 static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
0734                       const char *ioctl_name,
0735                       void __user *uptr)
0736 {
0737     struct vmci_ctx_chkpt_buf_info set_info;
0738     u32 cid;
0739     void *cpt_buf;
0740     int retval;
0741 
0742     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0743         vmci_ioctl_err("only valid for contexts\n");
0744         return -EINVAL;
0745     }
0746 
0747     if (copy_from_user(&set_info, uptr, sizeof(set_info)))
0748         return -EFAULT;
0749 
0750     cpt_buf = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,
0751                 set_info.buf_size);
0752     if (IS_ERR(cpt_buf))
0753         return PTR_ERR(cpt_buf);
0754 
0755     cid = vmci_ctx_get_id(vmci_host_dev->context);
0756     set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
0757                            set_info.buf_size, cpt_buf);
0758 
0759     retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
0760 
0761     kfree(cpt_buf);
0762     return retval;
0763 }
0764 
0765 static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
0766                        const char *ioctl_name,
0767                        void __user *uptr)
0768 {
0769     u32 __user *u32ptr = uptr;
0770 
0771     return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
0772 }
0773 
0774 static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
0775                    const char *ioctl_name,
0776                    void __user *uptr)
0777 {
0778     struct vmci_set_notify_info notify_info;
0779 
0780     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0781         vmci_ioctl_err("only valid for contexts\n");
0782         return -EINVAL;
0783     }
0784 
0785     if (copy_from_user(&notify_info, uptr, sizeof(notify_info)))
0786         return -EFAULT;
0787 
0788     if (notify_info.notify_uva) {
0789         notify_info.result =
0790             vmci_host_setup_notify(vmci_host_dev->context,
0791                            notify_info.notify_uva);
0792     } else {
0793         vmci_ctx_unset_notify(vmci_host_dev->context);
0794         notify_info.result = VMCI_SUCCESS;
0795     }
0796 
0797     return copy_to_user(uptr, &notify_info, sizeof(notify_info)) ?
0798         -EFAULT : 0;
0799 }
0800 
0801 static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
0802                     const char *ioctl_name,
0803                     void __user *uptr)
0804 {
0805     struct vmci_dbell_notify_resource_info info;
0806     u32 cid;
0807 
0808     if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
0809         vmci_ioctl_err("invalid for current VMX versions\n");
0810         return -EINVAL;
0811     }
0812 
0813     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0814         vmci_ioctl_err("only valid for contexts\n");
0815         return -EINVAL;
0816     }
0817 
0818     if (copy_from_user(&info, uptr, sizeof(info)))
0819         return -EFAULT;
0820 
0821     cid = vmci_ctx_get_id(vmci_host_dev->context);
0822 
0823     switch (info.action) {
0824     case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
0825         if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
0826             u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
0827             info.result = vmci_ctx_notify_dbell(cid, info.handle,
0828                                 flags);
0829         } else {
0830             info.result = VMCI_ERROR_UNAVAILABLE;
0831         }
0832         break;
0833 
0834     case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
0835         info.result = vmci_ctx_dbell_create(cid, info.handle);
0836         break;
0837 
0838     case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
0839         info.result = vmci_ctx_dbell_destroy(cid, info.handle);
0840         break;
0841 
0842     default:
0843         vmci_ioctl_err("got unknown action (action=%d)\n",
0844                    info.action);
0845         info.result = VMCI_ERROR_INVALID_ARGS;
0846     }
0847 
0848     return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
0849 }
0850 
0851 static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
0852                        const char *ioctl_name,
0853                        void __user *uptr)
0854 {
0855     struct vmci_ctx_notify_recv_info info;
0856     struct vmci_handle_arr *db_handle_array;
0857     struct vmci_handle_arr *qp_handle_array;
0858     void __user *ubuf;
0859     u32 cid;
0860     int retval = 0;
0861 
0862     if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
0863         vmci_ioctl_err("only valid for contexts\n");
0864         return -EINVAL;
0865     }
0866 
0867     if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
0868         vmci_ioctl_err("not supported for the current vmx version\n");
0869         return -EINVAL;
0870     }
0871 
0872     if (copy_from_user(&info, uptr, sizeof(info)))
0873         return -EFAULT;
0874 
0875     if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
0876         (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
0877         return -EINVAL;
0878     }
0879 
0880     cid = vmci_ctx_get_id(vmci_host_dev->context);
0881 
0882     info.result = vmci_ctx_rcv_notifications_get(cid,
0883                 &db_handle_array, &qp_handle_array);
0884     if (info.result != VMCI_SUCCESS)
0885         return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
0886 
0887     ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
0888     info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
0889                         db_handle_array, &retval);
0890     if (info.result == VMCI_SUCCESS && !retval) {
0891         ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
0892         info.result = drv_cp_harray_to_user(ubuf,
0893                             &info.qp_handle_buf_size,
0894                             qp_handle_array, &retval);
0895     }
0896 
0897     if (!retval && copy_to_user(uptr, &info, sizeof(info)))
0898         retval = -EFAULT;
0899 
0900     vmci_ctx_rcv_notifications_release(cid,
0901                 db_handle_array, qp_handle_array,
0902                 info.result == VMCI_SUCCESS && !retval);
0903 
0904     return retval;
0905 }
0906 
0907 static long vmci_host_unlocked_ioctl(struct file *filp,
0908                      unsigned int iocmd, unsigned long ioarg)
0909 {
0910 #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do {            \
0911         char *name = "IOCTL_VMCI_" # ioctl_name;        \
0912         return vmci_host_do_ ## ioctl_fn(           \
0913             vmci_host_dev, name, uptr);         \
0914     } while (0)
0915 
0916     struct vmci_host_dev *vmci_host_dev = filp->private_data;
0917     void __user *uptr = (void __user *)ioarg;
0918 
0919     switch (iocmd) {
0920     case IOCTL_VMCI_INIT_CONTEXT:
0921         VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
0922     case IOCTL_VMCI_DATAGRAM_SEND:
0923         VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
0924     case IOCTL_VMCI_DATAGRAM_RECEIVE:
0925         VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
0926     case IOCTL_VMCI_QUEUEPAIR_ALLOC:
0927         VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
0928     case IOCTL_VMCI_QUEUEPAIR_SETVA:
0929         VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
0930     case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
0931         VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
0932     case IOCTL_VMCI_QUEUEPAIR_DETACH:
0933         VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
0934     case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
0935         VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
0936     case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
0937         VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
0938     case IOCTL_VMCI_CTX_GET_CPT_STATE:
0939         VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
0940     case IOCTL_VMCI_CTX_SET_CPT_STATE:
0941         VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
0942     case IOCTL_VMCI_GET_CONTEXT_ID:
0943         VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
0944     case IOCTL_VMCI_SET_NOTIFY:
0945         VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
0946     case IOCTL_VMCI_NOTIFY_RESOURCE:
0947         VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
0948     case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
0949         VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
0950 
0951     case IOCTL_VMCI_VERSION:
0952     case IOCTL_VMCI_VERSION2:
0953         return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
0954 
0955     default:
0956         pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
0957         return -EINVAL;
0958     }
0959 
0960 #undef VMCI_DO_IOCTL
0961 }
0962 
0963 static const struct file_operations vmuser_fops = {
0964     .owner      = THIS_MODULE,
0965     .open       = vmci_host_open,
0966     .release    = vmci_host_close,
0967     .poll       = vmci_host_poll,
0968     .unlocked_ioctl = vmci_host_unlocked_ioctl,
0969     .compat_ioctl   = compat_ptr_ioctl,
0970 };
0971 
0972 static struct miscdevice vmci_host_miscdev = {
0973      .name = "vmci",
0974      .minor = MISC_DYNAMIC_MINOR,
0975      .fops = &vmuser_fops,
0976 };
0977 
0978 int __init vmci_host_init(void)
0979 {
0980     int error;
0981 
0982     host_context = vmci_ctx_create(VMCI_HOST_CONTEXT_ID,
0983                     VMCI_DEFAULT_PROC_PRIVILEGE_FLAGS,
0984                     -1, VMCI_VERSION, NULL);
0985     if (IS_ERR(host_context)) {
0986         error = PTR_ERR(host_context);
0987         pr_warn("Failed to initialize VMCIContext (error%d)\n",
0988             error);
0989         return error;
0990     }
0991 
0992     error = misc_register(&vmci_host_miscdev);
0993     if (error) {
0994         pr_warn("Module registration error (name=%s, major=%d, minor=%d, err=%d)\n",
0995             vmci_host_miscdev.name,
0996             MISC_MAJOR, vmci_host_miscdev.minor,
0997             error);
0998         pr_warn("Unable to initialize host personality\n");
0999         vmci_ctx_destroy(host_context);
1000         return error;
1001     }
1002 
1003     pr_info("VMCI host device registered (name=%s, major=%d, minor=%d)\n",
1004         vmci_host_miscdev.name, MISC_MAJOR, vmci_host_miscdev.minor);
1005 
1006     vmci_host_device_initialized = true;
1007     return 0;
1008 }
1009 
1010 void __exit vmci_host_exit(void)
1011 {
1012     vmci_host_device_initialized = false;
1013 
1014     misc_deregister(&vmci_host_miscdev);
1015     vmci_ctx_destroy(host_context);
1016     vmci_qp_broker_exit();
1017 
1018     pr_debug("VMCI host driver module unloaded\n");
1019 }
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