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linuxdebug/drivers/misc/vmw_vmci/vmci_host.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* VMware VMCI Driver
*
* Copyright (C) 2012 VMware, Inc. All rights reserved.
*/
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.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/cred.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);
}
int vmci_host_users(void)
{
return atomic_read(&vmci_host_active_users);
}
/*
* 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 __poll_t vmci_host_poll(struct file *filp, poll_table *wait)
{
struct vmci_host_dev *vmci_host_dev = filp->private_data;
struct vmci_ctx *context;
__poll_t mask = 0;
if (vmci_host_dev->ct_type == VMCIOBJ_CONTEXT) {
/*
* Read context only if ct_type == VMCIOBJ_CONTEXT to make
* sure that context is initialized
*/
context = vmci_host_dev->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 = EPOLLIN;
}
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));
/*
* Lock physical page backing a given user VA.
*/
retval = get_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);
if (retval != 1) {
context->notify_page = NULL;
return VMCI_ERROR_GENERIC;
}
if (context->notify_page == NULL)
return VMCI_ERROR_UNAVAILABLE;
/*
* 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);
vmci_call_vsock_callback(true);
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 = memdup_user((void __user *)(uintptr_t)send_info.addr,
send_info.len);
if (IS_ERR(dg)) {
vmci_ioctl_err(
"cannot allocate memory to dispatch datagram\n");
return PTR_ERR(dg);
}
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;
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) {
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 = memdup_user((void __user *)(uintptr_t)set_info.cpt_buf,
set_info.buf_size);
if (IS_ERR(cpt_buf))
return PTR_ERR(cpt_buf);
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;
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(&notify_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, &notify_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 = "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 = compat_ptr_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");
}
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