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 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_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_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_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_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_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_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_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_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_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_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_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_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;
}
