123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041 |
- /*
- * VMware VMCI Driver
- *
- * Copyright (C) 2012 VMware, Inc. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation version 2 and no later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- */
- #include <linux/vmw_vmci_defs.h>
- #include <linux/vmw_vmci_api.h>
- #include <linux/moduleparam.h>
- #include <linux/miscdevice.h>
- #include <linux/interrupt.h>
- #include <linux/highmem.h>
- #include <linux/atomic.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/mutex.h>
- #include <linux/sched.h>
- #include <linux/slab.h>
- #include <linux/file.h>
- #include <linux/init.h>
- #include <linux/poll.h>
- #include <linux/pci.h>
- #include <linux/smp.h>
- #include <linux/fs.h>
- #include <linux/io.h>
- #include "vmci_handle_array.h"
- #include "vmci_queue_pair.h"
- #include "vmci_datagram.h"
- #include "vmci_doorbell.h"
- #include "vmci_resource.h"
- #include "vmci_context.h"
- #include "vmci_driver.h"
- #include "vmci_event.h"
- #define VMCI_UTIL_NUM_RESOURCES 1
- enum {
- VMCI_NOTIFY_RESOURCE_QUEUE_PAIR = 0,
- VMCI_NOTIFY_RESOURCE_DOOR_BELL = 1,
- };
- enum {
- VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY = 0,
- VMCI_NOTIFY_RESOURCE_ACTION_CREATE = 1,
- VMCI_NOTIFY_RESOURCE_ACTION_DESTROY = 2,
- };
- /*
- * VMCI driver initialization. This block can also be used to
- * pass initial group membership etc.
- */
- struct vmci_init_blk {
- u32 cid;
- u32 flags;
- };
- /* VMCIqueue_pairAllocInfo_VMToVM */
- struct vmci_qp_alloc_info_vmvm {
- struct vmci_handle handle;
- u32 peer;
- u32 flags;
- u64 produce_size;
- u64 consume_size;
- u64 produce_page_file; /* User VA. */
- u64 consume_page_file; /* User VA. */
- u64 produce_page_file_size; /* Size of the file name array. */
- u64 consume_page_file_size; /* Size of the file name array. */
- s32 result;
- u32 _pad;
- };
- /* VMCISetNotifyInfo: Used to pass notify flag's address to the host driver. */
- struct vmci_set_notify_info {
- u64 notify_uva;
- s32 result;
- u32 _pad;
- };
- /*
- * Per-instance host state
- */
- struct vmci_host_dev {
- struct vmci_ctx *context;
- int user_version;
- enum vmci_obj_type ct_type;
- struct mutex lock; /* Mutex lock for vmci context access */
- };
- static struct vmci_ctx *host_context;
- static bool vmci_host_device_initialized;
- static atomic_t vmci_host_active_users = ATOMIC_INIT(0);
- /*
- * Determines whether the VMCI host personality is
- * available. Since the core functionality of the host driver is
- * always present, all guests could possibly use the host
- * personality. However, to minimize the deviation from the
- * pre-unified driver state of affairs, we only consider the host
- * device active if there is no active guest device or if there
- * are VMX'en with active VMCI contexts using the host device.
- */
- bool vmci_host_code_active(void)
- {
- return vmci_host_device_initialized &&
- (!vmci_guest_code_active() ||
- atomic_read(&vmci_host_active_users) > 0);
- }
- /*
- * Called on open of /dev/vmci.
- */
- static int vmci_host_open(struct inode *inode, struct file *filp)
- {
- struct vmci_host_dev *vmci_host_dev;
- vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL);
- if (vmci_host_dev == NULL)
- return -ENOMEM;
- vmci_host_dev->ct_type = VMCIOBJ_NOT_SET;
- mutex_init(&vmci_host_dev->lock);
- filp->private_data = vmci_host_dev;
- return 0;
- }
- /*
- * 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;
- }
- /*
- * This is used to wake up the VMX when a VMCI call arrives, or
- * to wake up select() or poll() at the next clock tick.
- */
- static unsigned int vmci_host_poll(struct file *filp, poll_table *wait)
- {
- struct vmci_host_dev *vmci_host_dev = filp->private_data;
- struct vmci_ctx *context = vmci_host_dev->context;
- unsigned int mask = 0;
- if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
- /* Check for VMCI calls to this VM context. */
- if (wait)
- poll_wait(filp, &context->host_context.wait_queue,
- wait);
- spin_lock(&context->lock);
- if (context->pending_datagrams > 0 ||
- vmci_handle_arr_get_size(
- context->pending_doorbell_array) > 0) {
- mask = POLLIN;
- }
- spin_unlock(&context->lock);
- }
- return mask;
- }
- /*
- * Copies the handles of a handle array into a user buffer, and
- * returns the new length in userBufferSize. If the copy to the
- * user buffer fails, the functions still returns VMCI_SUCCESS,
- * but retval != 0.
- */
- static int drv_cp_harray_to_user(void __user *user_buf_uva,
- u64 *user_buf_size,
- struct vmci_handle_arr *handle_array,
- int *retval)
- {
- u32 array_size = 0;
- struct vmci_handle *handles;
- if (handle_array)
- array_size = vmci_handle_arr_get_size(handle_array);
- if (array_size * sizeof(*handles) > *user_buf_size)
- return VMCI_ERROR_MORE_DATA;
- *user_buf_size = array_size * sizeof(*handles);
- if (*user_buf_size)
- *retval = copy_to_user(user_buf_uva,
- vmci_handle_arr_get_handles
- (handle_array), *user_buf_size);
- return VMCI_SUCCESS;
- }
- /*
- * Sets up a given context for notify to work. Maps the notify
- * boolean in user VA into kernel space.
- */
- static int vmci_host_setup_notify(struct vmci_ctx *context,
- unsigned long uva)
- {
- int retval;
- if (context->notify_page) {
- pr_devel("%s: Notify mechanism is already set up\n", __func__);
- return VMCI_ERROR_DUPLICATE_ENTRY;
- }
- /*
- * We are using 'bool' internally, but let's make sure we explicit
- * about the size.
- */
- BUILD_BUG_ON(sizeof(bool) != sizeof(u8));
- if (!access_ok(VERIFY_WRITE, (void __user *)uva, sizeof(u8)))
- return VMCI_ERROR_GENERIC;
- /*
- * Lock physical page backing a given user VA.
- */
- retval = get_user_pages_fast(uva, 1, 1, &context->notify_page);
- if (retval != 1) {
- context->notify_page = NULL;
- return VMCI_ERROR_GENERIC;
- }
- /*
- * Map the locked page and set up notify pointer.
- */
- context->notify = kmap(context->notify_page) + (uva & (PAGE_SIZE - 1));
- vmci_ctx_check_signal_notify(context);
- return VMCI_SUCCESS;
- }
- static int vmci_host_get_version(struct vmci_host_dev *vmci_host_dev,
- unsigned int cmd, void __user *uptr)
- {
- if (cmd == IOCTL_VMCI_VERSION2) {
- int __user *vptr = uptr;
- if (get_user(vmci_host_dev->user_version, vptr))
- return -EFAULT;
- }
- /*
- * The basic logic here is:
- *
- * If the user sends in a version of 0 tell it our version.
- * If the user didn't send in a version, tell it our version.
- * If the user sent in an old version, tell it -its- version.
- * If the user sent in an newer version, tell it our version.
- *
- * The rationale behind telling the caller its version is that
- * Workstation 6.5 required that VMX and VMCI kernel module were
- * version sync'd. All new VMX users will be programmed to
- * handle the VMCI kernel module version.
- */
- if (vmci_host_dev->user_version > 0 &&
- vmci_host_dev->user_version < VMCI_VERSION_HOSTQP) {
- return vmci_host_dev->user_version;
- }
- return VMCI_VERSION;
- }
- #define vmci_ioctl_err(fmt, ...) \
- pr_devel("%s: " fmt, ioctl_name, ##__VA_ARGS__)
- 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;
- }
- static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_datagram_snd_rcv_info send_info;
- struct vmci_datagram *dg = NULL;
- u32 cid;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&send_info, uptr, sizeof(send_info)))
- return -EFAULT;
- if (send_info.len > VMCI_MAX_DG_SIZE) {
- vmci_ioctl_err("datagram is too big (size=%d)\n",
- send_info.len);
- return -EINVAL;
- }
- if (send_info.len < sizeof(*dg)) {
- vmci_ioctl_err("datagram is too small (size=%d)\n",
- send_info.len);
- return -EINVAL;
- }
- dg = kmalloc(send_info.len, GFP_KERNEL);
- if (!dg) {
- vmci_ioctl_err(
- "cannot allocate memory to dispatch datagram\n");
- return -ENOMEM;
- }
- if (copy_from_user(dg, (void __user *)(uintptr_t)send_info.addr,
- send_info.len)) {
- vmci_ioctl_err("error getting datagram\n");
- kfree(dg);
- return -EFAULT;
- }
- if (VMCI_DG_SIZE(dg) != send_info.len) {
- vmci_ioctl_err("datagram size mismatch\n");
- kfree(dg);
- return -EINVAL;
- }
- pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n",
- dg->dst.context, dg->dst.resource,
- dg->src.context, dg->src.resource,
- (unsigned long long)dg->payload_size);
- /* Get source context id. */
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- send_info.result = vmci_datagram_dispatch(cid, dg, true);
- kfree(dg);
- return copy_to_user(uptr, &send_info, sizeof(send_info)) ? -EFAULT : 0;
- }
- static int vmci_host_do_receive_datagram(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_datagram_snd_rcv_info recv_info;
- struct vmci_datagram *dg = NULL;
- int retval;
- size_t size;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&recv_info, uptr, sizeof(recv_info)))
- return -EFAULT;
- size = recv_info.len;
- recv_info.result = vmci_ctx_dequeue_datagram(vmci_host_dev->context,
- &size, &dg);
- if (recv_info.result >= VMCI_SUCCESS) {
- void __user *ubuf = (void __user *)(uintptr_t)recv_info.addr;
- retval = copy_to_user(ubuf, dg, VMCI_DG_SIZE(dg));
- kfree(dg);
- if (retval != 0)
- return -EFAULT;
- }
- return copy_to_user(uptr, &recv_info, sizeof(recv_info)) ? -EFAULT : 0;
- }
- static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_handle handle;
- int vmci_status;
- int __user *retptr;
- u32 cid;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
- struct vmci_qp_alloc_info_vmvm alloc_info;
- struct vmci_qp_alloc_info_vmvm __user *info = uptr;
- if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
- return -EFAULT;
- handle = alloc_info.handle;
- retptr = &info->result;
- vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
- alloc_info.peer,
- alloc_info.flags,
- VMCI_NO_PRIVILEGE_FLAGS,
- alloc_info.produce_size,
- alloc_info.consume_size,
- NULL,
- vmci_host_dev->context);
- if (vmci_status == VMCI_SUCCESS)
- vmci_status = VMCI_SUCCESS_QUEUEPAIR_CREATE;
- } else {
- struct vmci_qp_alloc_info alloc_info;
- struct vmci_qp_alloc_info __user *info = uptr;
- struct vmci_qp_page_store page_store;
- if (copy_from_user(&alloc_info, uptr, sizeof(alloc_info)))
- return -EFAULT;
- handle = alloc_info.handle;
- retptr = &info->result;
- page_store.pages = alloc_info.ppn_va;
- page_store.len = alloc_info.num_ppns;
- vmci_status = vmci_qp_broker_alloc(alloc_info.handle,
- alloc_info.peer,
- alloc_info.flags,
- VMCI_NO_PRIVILEGE_FLAGS,
- alloc_info.produce_size,
- alloc_info.consume_size,
- &page_store,
- vmci_host_dev->context);
- }
- if (put_user(vmci_status, retptr)) {
- if (vmci_status >= VMCI_SUCCESS) {
- vmci_status = vmci_qp_broker_detach(handle,
- vmci_host_dev->context);
- }
- return -EFAULT;
- }
- return 0;
- }
- static int vmci_host_do_queuepair_setva(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_qp_set_va_info set_va_info;
- struct vmci_qp_set_va_info __user *info = uptr;
- s32 result;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
- vmci_ioctl_err("is not allowed\n");
- return -EINVAL;
- }
- if (copy_from_user(&set_va_info, uptr, sizeof(set_va_info)))
- return -EFAULT;
- if (set_va_info.va) {
- /*
- * VMX is passing down a new VA for the queue
- * pair mapping.
- */
- result = vmci_qp_broker_map(set_va_info.handle,
- vmci_host_dev->context,
- set_va_info.va);
- } else {
- /*
- * The queue pair is about to be unmapped by
- * the VMX.
- */
- result = vmci_qp_broker_unmap(set_va_info.handle,
- vmci_host_dev->context, 0);
- }
- return put_user(result, &info->result) ? -EFAULT : 0;
- }
- static int vmci_host_do_queuepair_setpf(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_qp_page_file_info page_file_info;
- struct vmci_qp_page_file_info __user *info = uptr;
- s32 result;
- if (vmci_host_dev->user_version < VMCI_VERSION_HOSTQP ||
- vmci_host_dev->user_version >= VMCI_VERSION_NOVMVM) {
- vmci_ioctl_err("not supported on this VMX (version=%d)\n",
- vmci_host_dev->user_version);
- return -EINVAL;
- }
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&page_file_info, uptr, sizeof(*info)))
- return -EFAULT;
- /*
- * Communicate success pre-emptively to the caller. Note that the
- * basic premise is that it is incumbent upon the caller not to look at
- * the info.result field until after the ioctl() returns. And then,
- * only if the ioctl() result indicates no error. We send up the
- * SUCCESS status before calling SetPageStore() store because failing
- * to copy up the result code means unwinding the SetPageStore().
- *
- * It turns out the logic to unwind a SetPageStore() opens a can of
- * worms. For example, if a host had created the queue_pair and a
- * guest attaches and SetPageStore() is successful but writing success
- * fails, then ... the host has to be stopped from writing (anymore)
- * data into the queue_pair. That means an additional test in the
- * VMCI_Enqueue() code path. Ugh.
- */
- if (put_user(VMCI_SUCCESS, &info->result)) {
- /*
- * In this case, we can't write a result field of the
- * caller's info block. So, we don't even try to
- * SetPageStore().
- */
- return -EFAULT;
- }
- result = vmci_qp_broker_set_page_store(page_file_info.handle,
- page_file_info.produce_va,
- page_file_info.consume_va,
- vmci_host_dev->context);
- if (result < VMCI_SUCCESS) {
- if (put_user(result, &info->result)) {
- /*
- * Note that in this case the SetPageStore()
- * call failed but we were unable to
- * communicate that to the caller (because the
- * copy_to_user() call failed). So, if we
- * simply return an error (in this case
- * -EFAULT) then the caller will know that the
- * SetPageStore failed even though we couldn't
- * put the result code in the result field and
- * indicate exactly why it failed.
- *
- * That says nothing about the issue where we
- * were once able to write to the caller's info
- * memory and now can't. Something more
- * serious is probably going on than the fact
- * that SetPageStore() didn't work.
- */
- return -EFAULT;
- }
- }
- return 0;
- }
- static int vmci_host_do_qp_detach(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_qp_dtch_info detach_info;
- struct vmci_qp_dtch_info __user *info = uptr;
- s32 result;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&detach_info, uptr, sizeof(detach_info)))
- return -EFAULT;
- result = vmci_qp_broker_detach(detach_info.handle,
- vmci_host_dev->context);
- if (result == VMCI_SUCCESS &&
- vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
- result = VMCI_SUCCESS_LAST_DETACH;
- }
- return put_user(result, &info->result) ? -EFAULT : 0;
- }
- static int vmci_host_do_ctx_add_notify(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_ctx_info ar_info;
- struct vmci_ctx_info __user *info = uptr;
- s32 result;
- u32 cid;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
- return -EFAULT;
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- result = vmci_ctx_add_notification(cid, ar_info.remote_cid);
- return put_user(result, &info->result) ? -EFAULT : 0;
- }
- static int vmci_host_do_ctx_remove_notify(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_ctx_info ar_info;
- struct vmci_ctx_info __user *info = uptr;
- u32 cid;
- int result;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&ar_info, uptr, sizeof(ar_info)))
- return -EFAULT;
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- result = vmci_ctx_remove_notification(cid,
- ar_info.remote_cid);
- return put_user(result, &info->result) ? -EFAULT : 0;
- }
- static int vmci_host_do_ctx_get_cpt_state(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_ctx_chkpt_buf_info get_info;
- u32 cid;
- void *cpt_buf;
- int retval;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&get_info, uptr, sizeof(get_info)))
- return -EFAULT;
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- get_info.result = vmci_ctx_get_chkpt_state(cid, get_info.cpt_type,
- &get_info.buf_size, &cpt_buf);
- if (get_info.result == VMCI_SUCCESS && get_info.buf_size) {
- void __user *ubuf = (void __user *)(uintptr_t)get_info.cpt_buf;
- retval = copy_to_user(ubuf, cpt_buf, get_info.buf_size);
- kfree(cpt_buf);
- if (retval)
- return -EFAULT;
- }
- return copy_to_user(uptr, &get_info, sizeof(get_info)) ? -EFAULT : 0;
- }
- static int vmci_host_do_ctx_set_cpt_state(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_ctx_chkpt_buf_info set_info;
- u32 cid;
- void *cpt_buf;
- int retval;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&set_info, uptr, sizeof(set_info)))
- return -EFAULT;
- cpt_buf = kmalloc(set_info.buf_size, GFP_KERNEL);
- if (!cpt_buf) {
- vmci_ioctl_err(
- "cannot allocate memory to set cpt state (type=%d)\n",
- set_info.cpt_type);
- return -ENOMEM;
- }
- if (copy_from_user(cpt_buf, (void __user *)(uintptr_t)set_info.cpt_buf,
- set_info.buf_size)) {
- retval = -EFAULT;
- goto out;
- }
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- set_info.result = vmci_ctx_set_chkpt_state(cid, set_info.cpt_type,
- set_info.buf_size, cpt_buf);
- retval = copy_to_user(uptr, &set_info, sizeof(set_info)) ? -EFAULT : 0;
- out:
- kfree(cpt_buf);
- return retval;
- }
- static int vmci_host_do_get_context_id(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- u32 __user *u32ptr = uptr;
- return put_user(VMCI_HOST_CONTEXT_ID, u32ptr) ? -EFAULT : 0;
- }
- static int vmci_host_do_set_notify(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_set_notify_info notify_info;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(¬ify_info, uptr, sizeof(notify_info)))
- return -EFAULT;
- if (notify_info.notify_uva) {
- notify_info.result =
- vmci_host_setup_notify(vmci_host_dev->context,
- notify_info.notify_uva);
- } else {
- vmci_ctx_unset_notify(vmci_host_dev->context);
- notify_info.result = VMCI_SUCCESS;
- }
- return copy_to_user(uptr, ¬ify_info, sizeof(notify_info)) ?
- -EFAULT : 0;
- }
- static int vmci_host_do_notify_resource(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_dbell_notify_resource_info info;
- u32 cid;
- if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
- vmci_ioctl_err("invalid for current VMX versions\n");
- return -EINVAL;
- }
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (copy_from_user(&info, uptr, sizeof(info)))
- return -EFAULT;
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- switch (info.action) {
- case VMCI_NOTIFY_RESOURCE_ACTION_NOTIFY:
- if (info.resource == VMCI_NOTIFY_RESOURCE_DOOR_BELL) {
- u32 flags = VMCI_NO_PRIVILEGE_FLAGS;
- info.result = vmci_ctx_notify_dbell(cid, info.handle,
- flags);
- } else {
- info.result = VMCI_ERROR_UNAVAILABLE;
- }
- break;
- case VMCI_NOTIFY_RESOURCE_ACTION_CREATE:
- info.result = vmci_ctx_dbell_create(cid, info.handle);
- break;
- case VMCI_NOTIFY_RESOURCE_ACTION_DESTROY:
- info.result = vmci_ctx_dbell_destroy(cid, info.handle);
- break;
- default:
- vmci_ioctl_err("got unknown action (action=%d)\n",
- info.action);
- info.result = VMCI_ERROR_INVALID_ARGS;
- }
- return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
- }
- static int vmci_host_do_recv_notifications(struct vmci_host_dev *vmci_host_dev,
- const char *ioctl_name,
- void __user *uptr)
- {
- struct vmci_ctx_notify_recv_info info;
- struct vmci_handle_arr *db_handle_array;
- struct vmci_handle_arr *qp_handle_array;
- void __user *ubuf;
- u32 cid;
- int retval = 0;
- if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
- vmci_ioctl_err("only valid for contexts\n");
- return -EINVAL;
- }
- if (vmci_host_dev->user_version < VMCI_VERSION_NOTIFY) {
- vmci_ioctl_err("not supported for the current vmx version\n");
- return -EINVAL;
- }
- if (copy_from_user(&info, uptr, sizeof(info)))
- return -EFAULT;
- if ((info.db_handle_buf_size && !info.db_handle_buf_uva) ||
- (info.qp_handle_buf_size && !info.qp_handle_buf_uva)) {
- return -EINVAL;
- }
- cid = vmci_ctx_get_id(vmci_host_dev->context);
- info.result = vmci_ctx_rcv_notifications_get(cid,
- &db_handle_array, &qp_handle_array);
- if (info.result != VMCI_SUCCESS)
- return copy_to_user(uptr, &info, sizeof(info)) ? -EFAULT : 0;
- ubuf = (void __user *)(uintptr_t)info.db_handle_buf_uva;
- info.result = drv_cp_harray_to_user(ubuf, &info.db_handle_buf_size,
- db_handle_array, &retval);
- if (info.result == VMCI_SUCCESS && !retval) {
- ubuf = (void __user *)(uintptr_t)info.qp_handle_buf_uva;
- info.result = drv_cp_harray_to_user(ubuf,
- &info.qp_handle_buf_size,
- qp_handle_array, &retval);
- }
- if (!retval && copy_to_user(uptr, &info, sizeof(info)))
- retval = -EFAULT;
- vmci_ctx_rcv_notifications_release(cid,
- db_handle_array, qp_handle_array,
- info.result == VMCI_SUCCESS && !retval);
- return retval;
- }
- static long vmci_host_unlocked_ioctl(struct file *filp,
- unsigned int iocmd, unsigned long ioarg)
- {
- #define VMCI_DO_IOCTL(ioctl_name, ioctl_fn) do { \
- char *name = __stringify(IOCTL_VMCI_ ## ioctl_name); \
- return vmci_host_do_ ## ioctl_fn( \
- vmci_host_dev, name, uptr); \
- } while (0)
- struct vmci_host_dev *vmci_host_dev = filp->private_data;
- void __user *uptr = (void __user *)ioarg;
- switch (iocmd) {
- case IOCTL_VMCI_INIT_CONTEXT:
- VMCI_DO_IOCTL(INIT_CONTEXT, init_context);
- case IOCTL_VMCI_DATAGRAM_SEND:
- VMCI_DO_IOCTL(DATAGRAM_SEND, send_datagram);
- case IOCTL_VMCI_DATAGRAM_RECEIVE:
- VMCI_DO_IOCTL(DATAGRAM_RECEIVE, receive_datagram);
- case IOCTL_VMCI_QUEUEPAIR_ALLOC:
- VMCI_DO_IOCTL(QUEUEPAIR_ALLOC, alloc_queuepair);
- case IOCTL_VMCI_QUEUEPAIR_SETVA:
- VMCI_DO_IOCTL(QUEUEPAIR_SETVA, queuepair_setva);
- case IOCTL_VMCI_QUEUEPAIR_SETPAGEFILE:
- VMCI_DO_IOCTL(QUEUEPAIR_SETPAGEFILE, queuepair_setpf);
- case IOCTL_VMCI_QUEUEPAIR_DETACH:
- VMCI_DO_IOCTL(QUEUEPAIR_DETACH, qp_detach);
- case IOCTL_VMCI_CTX_ADD_NOTIFICATION:
- VMCI_DO_IOCTL(CTX_ADD_NOTIFICATION, ctx_add_notify);
- case IOCTL_VMCI_CTX_REMOVE_NOTIFICATION:
- VMCI_DO_IOCTL(CTX_REMOVE_NOTIFICATION, ctx_remove_notify);
- case IOCTL_VMCI_CTX_GET_CPT_STATE:
- VMCI_DO_IOCTL(CTX_GET_CPT_STATE, ctx_get_cpt_state);
- case IOCTL_VMCI_CTX_SET_CPT_STATE:
- VMCI_DO_IOCTL(CTX_SET_CPT_STATE, ctx_set_cpt_state);
- case IOCTL_VMCI_GET_CONTEXT_ID:
- VMCI_DO_IOCTL(GET_CONTEXT_ID, get_context_id);
- case IOCTL_VMCI_SET_NOTIFY:
- VMCI_DO_IOCTL(SET_NOTIFY, set_notify);
- case IOCTL_VMCI_NOTIFY_RESOURCE:
- VMCI_DO_IOCTL(NOTIFY_RESOURCE, notify_resource);
- case IOCTL_VMCI_NOTIFICATIONS_RECEIVE:
- VMCI_DO_IOCTL(NOTIFICATIONS_RECEIVE, recv_notifications);
- case IOCTL_VMCI_VERSION:
- case IOCTL_VMCI_VERSION2:
- return vmci_host_get_version(vmci_host_dev, iocmd, uptr);
- default:
- pr_devel("%s: Unknown ioctl (iocmd=%d)\n", __func__, iocmd);
- return -EINVAL;
- }
- #undef VMCI_DO_IOCTL
- }
- static const struct file_operations vmuser_fops = {
- .owner = THIS_MODULE,
- .open = vmci_host_open,
- .release = vmci_host_close,
- .poll = vmci_host_poll,
- .unlocked_ioctl = vmci_host_unlocked_ioctl,
- .compat_ioctl = vmci_host_unlocked_ioctl,
- };
- static struct miscdevice vmci_host_miscdev = {
- .name = "vmci",
- .minor = MISC_DYNAMIC_MINOR,
- .fops = &vmuser_fops,
- };
- 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");
- }
|