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    Subject[PATCH 01/12] VMCI: context implementation.
    From
    Date
    VMCI Context code maintains state for vmci and allows the driver to communicate
    with multiple VMs.

    Signed-off-by: George Zhang <georgezhang@vmware.com>
    Acked-by: Andy king <acking@vmware.com>
    Acked-by: Dmitry Torokhov <dtor@vmware.com>
    ---
    drivers/misc/vmw_vmci/vmci_context.c | 1214 ++++++++++++++++++++++++++++++++++
    drivers/misc/vmw_vmci/vmci_context.h | 182 +++++
    2 files changed, 1396 insertions(+), 0 deletions(-)
    create mode 100644 drivers/misc/vmw_vmci/vmci_context.c
    create mode 100644 drivers/misc/vmw_vmci/vmci_context.h

    diff --git a/drivers/misc/vmw_vmci/vmci_context.c b/drivers/misc/vmw_vmci/vmci_context.c
    new file mode 100644
    index 0000000..f866a4b
    --- /dev/null
    +++ b/drivers/misc/vmw_vmci/vmci_context.c
    @@ -0,0 +1,1214 @@
    +/*
    + * 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/highmem.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/sched.h>
    +#include <linux/slab.h>
    +
    +#include "vmci_queue_pair.h"
    +#include "vmci_datagram.h"
    +#include "vmci_doorbell.h"
    +#include "vmci_context.h"
    +#include "vmci_driver.h"
    +#include "vmci_event.h"
    +
    +/*
    + * List of current VMCI contexts. Contexts can be added by
    + * vmci_ctx_create() and removed via vmci_ctx_destroy().
    + * These, along with context lookup, are protected by the
    + * list structure's lock.
    + */
    +static struct {
    + struct list_head head;
    + spinlock_t lock; /* Spinlock for context list operations */
    +} ctx_list = {
    + .head = LIST_HEAD_INIT(ctx_list.head),
    + .lock = __SPIN_LOCK_UNLOCKED(ctx_list.lock),
    +};
    +
    +/* Used by contexts that did not set up notify flag pointers */
    +static bool ctx_dummy_notify;
    +
    +static void ctx_signal_notify(struct vmci_ctx *context)
    +{
    + *context->notify = true;
    +}
    +
    +static void ctx_clear_notify(struct vmci_ctx *context)
    +{
    + *context->notify = false;
    +}
    +
    +/*
    + * If nothing requires the attention of the guest, clears both
    + * notify flag and call.
    + */
    +static void ctx_clear_notify_call(struct vmci_ctx *context)
    +{
    + if (context->pending_datagrams == 0 &&
    + vmci_handle_arr_get_size(context->pending_doorbell_array) == 0)
    + ctx_clear_notify(context);
    +}
    +
    +/*
    + * Sets the context's notify flag iff datagrams are pending for this
    + * context. Called from vmci_setup_notify().
    + */
    +void vmci_ctx_check_signal_notify(struct vmci_ctx *context)
    +{
    + spin_lock(&context->lock);
    + if (context->pending_datagrams)
    + ctx_signal_notify(context);
    + spin_unlock(&context->lock);
    +}
    +
    +/*
    + * Allocates and initializes a VMCI context.
    + */
    +struct vmci_ctx *vmci_ctx_create(u32 cid, u32 priv_flags,
    + uintptr_t event_hnd,
    + int user_version,
    + const struct cred *cred)
    +{
    + struct vmci_ctx *context;
    + int error;
    +
    + if (cid == VMCI_INVALID_ID) {
    + pr_devel("Invalid context ID for VMCI context\n");
    + error = -EINVAL;
    + goto err_out;
    + }
    +
    + if (priv_flags & ~VMCI_PRIVILEGE_ALL_FLAGS) {
    + pr_devel("Invalid flag (flags=0x%x) for VMCI context\n",
    + priv_flags);
    + error = -EINVAL;
    + goto err_out;
    + }
    +
    + if (user_version == 0) {
    + pr_devel("Invalid suer_version %d\n", user_version);
    + error = -EINVAL;
    + goto err_out;
    + }
    +
    + context = kzalloc(sizeof(*context), GFP_KERNEL);
    + if (!context) {
    + pr_warn("Failed to allocate memory for VMCI context\n");
    + error = -EINVAL;
    + goto err_out;
    + }
    +
    + kref_init(&context->kref);
    + spin_lock_init(&context->lock);
    + INIT_LIST_HEAD(&context->list_item);
    + INIT_LIST_HEAD(&context->datagram_queue);
    + INIT_LIST_HEAD(&context->notifier_list);
    +
    + /* Initialize host-specific VMCI context. */
    + init_waitqueue_head(&context->host_context.wait_queue);
    +
    + context->queue_pair_array = vmci_handle_arr_create(0);
    + if (!context->queue_pair_array) {
    + error = -ENOMEM;
    + goto err_free_ctx;
    + }
    +
    + context->doorbell_array = vmci_handle_arr_create(0);
    + if (!context->doorbell_array) {
    + error = -ENOMEM;
    + goto err_free_qp_array;
    + }
    +
    + context->pending_doorbell_array = vmci_handle_arr_create(0);
    + if (!context->pending_doorbell_array) {
    + error = -ENOMEM;
    + goto err_free_db_array;
    + }
    +
    + context->user_version = user_version;
    +
    + context->priv_flags = priv_flags;
    +
    + if (cred)
    + context->cred = get_cred(cred);
    +
    + context->notify = &ctx_dummy_notify;
    + context->notify_page = NULL;
    +
    + /*
    + * If we collide with an existing context we generate a new
    + * and use it instead. The VMX will determine if regeneration
    + * is okay. Since there isn't 4B - 16 VMs running on a given
    + * host, the below loop will terminate.
    + */
    + spin_lock(&ctx_list.lock);
    +
    + while (vmci_ctx_exists(cid)) {
    + /* We reserve the lowest 16 ids for fixed contexts. */
    + cid = max(cid, VMCI_RESERVED_CID_LIMIT - 1) + 1;
    + if (cid == VMCI_INVALID_ID)
    + cid = VMCI_RESERVED_CID_LIMIT;
    + }
    + context->cid = cid;
    +
    + list_add_tail_rcu(&context->list_item, &ctx_list.head);
    + spin_unlock(&ctx_list.lock);
    +
    + return context;
    +
    + err_free_db_array:
    + vmci_handle_arr_destroy(context->doorbell_array);
    + err_free_qp_array:
    + vmci_handle_arr_destroy(context->queue_pair_array);
    + err_free_ctx:
    + kfree(context);
    + err_out:
    + return ERR_PTR(error);
    +}
    +
    +/*
    + * Destroy VMCI context.
    + */
    +void vmci_ctx_destroy(struct vmci_ctx *context)
    +{
    + spin_lock(&ctx_list.lock);
    + list_del_rcu(&context->list_item);
    + spin_unlock(&ctx_list.lock);
    + synchronize_rcu();
    +
    + vmci_ctx_put(context);
    +}
    +
    +/*
    + * Fire notification for all contexts interested in given cid.
    + */
    +static int ctx_fire_notification(u32 context_id, u32 priv_flags)
    +{
    + u32 i, array_size;
    + struct vmci_ctx *sub_ctx;
    + struct vmci_handle_arr *subscriber_array;
    + struct vmci_handle context_handle =
    + vmci_make_handle(context_id, VMCI_EVENT_HANDLER);
    +
    + /*
    + * We create an array to hold the subscribers we find when
    + * scanning through all contexts.
    + */
    + subscriber_array = vmci_handle_arr_create(0);
    + if (subscriber_array == NULL)
    + return VMCI_ERROR_NO_MEM;
    +
    + /*
    + * Scan all contexts to find who is interested in being
    + * notified about given contextID.
    + */
    + rcu_read_lock();
    + list_for_each_entry_rcu(sub_ctx, &ctx_list.head, list_item) {
    + struct vmci_handle_list *node;
    +
    + /*
    + * We only deliver notifications of the removal of
    + * contexts, if the two contexts are allowed to
    + * interact.
    + */
    + if (vmci_deny_interaction(priv_flags, sub_ctx->priv_flags))
    + continue;
    +
    + list_for_each_entry_rcu(node, &sub_ctx->notifier_list, node) {
    + if (!vmci_handle_is_equal(node->handle, context_handle))
    + continue;
    +
    + vmci_handle_arr_append_entry(&subscriber_array,
    + vmci_make_handle(sub_ctx->cid,
    + VMCI_EVENT_HANDLER));
    + }
    + }
    + rcu_read_unlock();
    +
    + /* Fire event to all subscribers. */
    + array_size = vmci_handle_arr_get_size(subscriber_array);
    + for (i = 0; i < array_size; i++) {
    + int result;
    + struct vmci_event_ctx ev;
    +
    + ev.msg.hdr.dst = vmci_handle_arr_get_entry(subscriber_array, i);
    + ev.msg.hdr.src = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
    + VMCI_CONTEXT_RESOURCE_ID);
    + ev.msg.hdr.payload_size = sizeof(ev) - sizeof(ev.msg.hdr);
    + ev.msg.event_data.event = VMCI_EVENT_CTX_REMOVED;
    + ev.payload.context_id = context_id;
    +
    + result = vmci_datagram_dispatch(VMCI_HYPERVISOR_CONTEXT_ID,
    + &ev.msg.hdr, false);
    + if (result < VMCI_SUCCESS) {
    + pr_devel("Failed to enqueue event datagram (type=%d) for context (ID=0x%x)\n",
    + ev.msg.event_data.event,
    + ev.msg.hdr.dst.context);
    + /* We continue to enqueue on next subscriber. */
    + }
    + }
    + vmci_handle_arr_destroy(subscriber_array);
    +
    + return VMCI_SUCCESS;
    +}
    +
    +/*
    + * Returns the current number of pending datagrams. The call may
    + * also serve as a synchronization point for the datagram queue,
    + * as no enqueue operations can occur concurrently.
    + */
    +int vmci_ctx_pending_datagrams(u32 cid, u32 *pending)
    +{
    + struct vmci_ctx *context;
    +
    + context = vmci_ctx_get(cid);
    + if (context == NULL)
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + spin_lock(&context->lock);
    + if (pending)
    + *pending = context->pending_datagrams;
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    +
    + return VMCI_SUCCESS;
    +}
    +
    +/*
    + * Queues a VMCI datagram for the appropriate target VM context.
    + */
    +int vmci_ctx_enqueue_datagram(u32 cid, struct vmci_datagram *dg)
    +{
    + struct vmci_datagram_queue_entry *dq_entry;
    + struct vmci_ctx *context;
    + struct vmci_handle dg_src;
    + size_t vmci_dg_size;
    +
    + vmci_dg_size = VMCI_DG_SIZE(dg);
    + if (vmci_dg_size > VMCI_MAX_DG_SIZE) {
    + pr_devel("Datagram too large (bytes=%Zu)\n", vmci_dg_size);
    + return VMCI_ERROR_INVALID_ARGS;
    + }
    +
    + /* Get the target VM's VMCI context. */
    + context = vmci_ctx_get(cid);
    + if (!context) {
    + pr_devel("Invalid context (ID=0x%x)\n", cid);
    + return VMCI_ERROR_INVALID_ARGS;
    + }
    +
    + /* Allocate guest call entry and add it to the target VM's queue. */
    + dq_entry = kmalloc(sizeof(*dq_entry), GFP_KERNEL);
    + if (dq_entry == NULL) {
    + pr_warn("Failed to allocate memory for datagram\n");
    + vmci_ctx_put(context);
    + return VMCI_ERROR_NO_MEM;
    + }
    + dq_entry->dg = dg;
    + dq_entry->dg_size = vmci_dg_size;
    + dg_src = dg->src;
    + INIT_LIST_HEAD(&dq_entry->list_item);
    +
    + spin_lock(&context->lock);
    +
    + /*
    + * We put a higher limit on datagrams from the hypervisor. If
    + * the pending datagram is not from hypervisor, then we check
    + * if enqueueing it would exceed the
    + * VMCI_MAX_DATAGRAM_QUEUE_SIZE limit on the destination. If
    + * the pending datagram is from hypervisor, we allow it to be
    + * queued at the destination side provided we don't reach the
    + * VMCI_MAX_DATAGRAM_AND_EVENT_QUEUE_SIZE limit.
    + */
    + if (context->datagram_queue_size + vmci_dg_size >=
    + VMCI_MAX_DATAGRAM_QUEUE_SIZE &&
    + (!vmci_handle_is_equal(dg_src,
    + vmci_make_handle
    + (VMCI_HYPERVISOR_CONTEXT_ID,
    + VMCI_CONTEXT_RESOURCE_ID)) ||
    + context->datagram_queue_size + vmci_dg_size >=
    + VMCI_MAX_DATAGRAM_AND_EVENT_QUEUE_SIZE)) {
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    + kfree(dq_entry);
    + pr_devel("Context (ID=0x%x) receive queue is full\n", cid);
    + return VMCI_ERROR_NO_RESOURCES;
    + }
    +
    + list_add(&dq_entry->list_item, &context->datagram_queue);
    + context->pending_datagrams++;
    + context->datagram_queue_size += vmci_dg_size;
    + ctx_signal_notify(context);
    + wake_up(&context->host_context.wait_queue);
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    +
    + return vmci_dg_size;
    +}
    +
    +/*
    + * Verifies whether a context with the specified context ID exists.
    + * FIXME: utility is dubious as no decisions can be reliably made
    + * using this data as context can appear and disappear at any time.
    + */
    +bool vmci_ctx_exists(u32 cid)
    +{
    + struct vmci_ctx *context;
    + bool exists = false;
    +
    + rcu_read_lock();
    +
    + list_for_each_entry_rcu(context, &ctx_list.head, list_item) {
    + if (context->cid == cid) {
    + exists = true;
    + break;
    + }
    + }
    +
    + rcu_read_unlock();
    + return exists;
    +}
    +
    +/*
    + * Retrieves VMCI context corresponding to the given cid.
    + */
    +struct vmci_ctx *vmci_ctx_get(u32 cid)
    +{
    + struct vmci_ctx *c, *context = NULL;
    +
    + if (cid == VMCI_INVALID_ID)
    + return NULL;
    +
    + rcu_read_lock();
    + list_for_each_entry_rcu(c, &ctx_list.head, list_item) {
    + if (c->cid == cid) {
    + /*
    + * The context owner drops its own reference to the
    + * context only after removing it from the list and
    + * waiting for RCU grace period to expire. This
    + * means that we are not about to increase the
    + * reference count of something that is in the
    + * process of being destroyed.
    + */
    + context = c;
    + kref_get(&context->kref);
    + break;
    + }
    + }
    + rcu_read_unlock();
    +
    + return context;
    +}
    +
    +/*
    + * Deallocates all parts of a context data structure. This
    + * function doesn't lock the context, because it assumes that
    + * the caller was holding the last reference to context.
    + */
    +static void ctx_free_ctx(struct kref *kref)
    +{
    + struct vmci_ctx *context = container_of(kref, struct vmci_ctx, kref);
    + struct vmci_datagram_queue_entry *dq_entry, *dq_entry_tmp;
    + struct vmci_handle temp_handle;
    + struct vmci_handle_list *notifier, *tmp;
    +
    + /*
    + * Fire event to all contexts interested in knowing this
    + * context is dying.
    + */
    + ctx_fire_notification(context->cid, context->priv_flags);
    +
    + /*
    + * Cleanup all queue pair resources attached to context. If
    + * the VM dies without cleaning up, this code will make sure
    + * that no resources are leaked.
    + */
    + temp_handle = vmci_handle_arr_get_entry(context->queue_pair_array, 0);
    + while (!vmci_handle_is_equal(temp_handle, VMCI_INVALID_HANDLE)) {
    + if (vmci_qp_broker_detach(temp_handle,
    + context) < VMCI_SUCCESS) {
    + /*
    + * When vmci_qp_broker_detach() succeeds it
    + * removes the handle from the array. If
    + * detach fails, we must remove the handle
    + * ourselves.
    + */
    + vmci_handle_arr_remove_entry(context->queue_pair_array,
    + temp_handle);
    + }
    + temp_handle =
    + vmci_handle_arr_get_entry(context->queue_pair_array, 0);
    + }
    +
    + /*
    + * It is fine to destroy this without locking the callQueue, as
    + * this is the only thread having a reference to the context.
    + */
    + list_for_each_entry_safe(dq_entry, dq_entry_tmp,
    + &context->datagram_queue, list_item) {
    + WARN_ON(dq_entry->dg_size != VMCI_DG_SIZE(dq_entry->dg));
    + list_del(&dq_entry->list_item);
    + kfree(dq_entry->dg);
    + kfree(dq_entry);
    + }
    +
    + list_for_each_entry_safe(notifier, tmp,
    + &context->notifier_list, node) {
    + list_del(&notifier->node);
    + kfree(notifier);
    + }
    +
    + vmci_handle_arr_destroy(context->queue_pair_array);
    + vmci_handle_arr_destroy(context->doorbell_array);
    + vmci_handle_arr_destroy(context->pending_doorbell_array);
    + vmci_ctx_unset_notify(context);
    + if (context->cred)
    + put_cred(context->cred);
    + kfree(context);
    +}
    +
    +/*
    + * Drops reference to VMCI context. If this is the last reference to
    + * the context it will be deallocated. A context is created with
    + * a reference count of one, and on destroy, it is removed from
    + * the context list before its reference count is decremented. Thus,
    + * if we reach zero, we are sure that nobody else are about to increment
    + * it (they need the entry in the context list for that), and so there
    + * is no need for locking.
    + */
    +void vmci_ctx_put(struct vmci_ctx *context)
    +{
    + kref_put(&context->kref, ctx_free_ctx);
    +}
    +
    +/*
    + * Dequeues the next datagram and returns it to caller.
    + * The caller passes in a pointer to the max size datagram
    + * it can handle and the datagram is only unqueued if the
    + * size is less than max_size. If larger max_size is set to
    + * the size of the datagram to give the caller a chance to
    + * set up a larger buffer for the guestcall.
    + */
    +int vmci_ctx_dequeue_datagram(struct vmci_ctx *context,
    + size_t *max_size,
    + struct vmci_datagram **dg)
    +{
    + struct vmci_datagram_queue_entry *dq_entry;
    + struct list_head *list_item;
    + int rv;
    +
    + /* Dequeue the next datagram entry. */
    + spin_lock(&context->lock);
    + if (context->pending_datagrams == 0) {
    + ctx_clear_notify_call(context);
    + spin_unlock(&context->lock);
    + pr_devel("No datagrams pending\n");
    + return VMCI_ERROR_NO_MORE_DATAGRAMS;
    + }
    +
    + list_item = context->datagram_queue.next;
    +
    + dq_entry =
    + list_entry(list_item, struct vmci_datagram_queue_entry, list_item);
    +
    + /* Check size of caller's buffer. */
    + if (*max_size < dq_entry->dg_size) {
    + *max_size = dq_entry->dg_size;
    + spin_unlock(&context->lock);
    + pr_devel("Caller's buffer should be at least (size=%u bytes)\n",
    + (u32) *max_size);
    + return VMCI_ERROR_NO_MEM;
    + }
    +
    + list_del(list_item);
    + context->pending_datagrams--;
    + context->datagram_queue_size -= dq_entry->dg_size;
    + if (context->pending_datagrams == 0) {
    + ctx_clear_notify_call(context);
    + rv = VMCI_SUCCESS;
    + } else {
    + /*
    + * Return the size of the next datagram.
    + */
    + struct vmci_datagram_queue_entry *next_entry;
    +
    + list_item = context->datagram_queue.next;
    + next_entry =
    + list_entry(list_item, struct vmci_datagram_queue_entry,
    + list_item);
    +
    + /*
    + * The following size_t -> int truncation is fine as
    + * the maximum size of a (routable) datagram is 68KB.
    + */
    + rv = (int)next_entry->dg_size;
    + }
    + spin_unlock(&context->lock);
    +
    + /* Caller must free datagram. */
    + *dg = dq_entry->dg;
    + dq_entry->dg = NULL;
    + kfree(dq_entry);
    +
    + return rv;
    +}
    +
    +/*
    + * Reverts actions set up by vmci_setup_notify(). Unmaps and unlocks the
    + * page mapped/locked by vmci_setup_notify().
    + */
    +void vmci_ctx_unset_notify(struct vmci_ctx *context)
    +{
    + struct page *notify_page;
    +
    + spin_lock(&context->lock);
    +
    + notify_page = context->notify_page;
    + context->notify = &ctx_dummy_notify;
    + context->notify_page = NULL;
    +
    + spin_unlock(&context->lock);
    +
    + if (notify_page) {
    + kunmap(notify_page);
    + put_page(notify_page);
    + }
    +}
    +
    +/*
    + * Add remote_cid to list of contexts current contexts wants
    + * notifications from/about.
    + */
    +int vmci_ctx_add_notification(u32 context_id, u32 remote_cid)
    +{
    + struct vmci_ctx *context;
    + struct vmci_handle_list *notifier, *n;
    + int result;
    + bool exists = false;
    +
    + context = vmci_ctx_get(context_id);
    + if (!context)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + if (VMCI_CONTEXT_IS_VM(context_id) && VMCI_CONTEXT_IS_VM(remote_cid)) {
    + pr_devel("Context removed notifications for other VMs not supported (src=0x%x, remote=0x%x)\n",
    + context_id, remote_cid);
    + result = VMCI_ERROR_DST_UNREACHABLE;
    + goto out;
    + }
    +
    + if (context->priv_flags & VMCI_PRIVILEGE_FLAG_RESTRICTED) {
    + result = VMCI_ERROR_NO_ACCESS;
    + goto out;
    + }
    +
    + notifier = kmalloc(sizeof(struct vmci_handle_list), GFP_KERNEL);
    + if (!notifier) {
    + result = VMCI_ERROR_NO_MEM;
    + goto out;
    + }
    +
    + INIT_LIST_HEAD(&notifier->node);
    + notifier->handle = vmci_make_handle(remote_cid, VMCI_EVENT_HANDLER);
    +
    + spin_lock(&context->lock);
    +
    + list_for_each_entry(n, &context->notifier_list, node) {
    + if (vmci_handle_is_equal(n->handle, notifier->handle)) {
    + exists = true;
    + break;
    + }
    + }
    +
    + if (exists) {
    + kfree(notifier);
    + result = VMCI_ERROR_ALREADY_EXISTS;
    + } else {
    + list_add_tail_rcu(&notifier->node, &context->notifier_list);
    + context->n_notifiers++;
    + result = VMCI_SUCCESS;
    + }
    +
    + spin_unlock(&context->lock);
    +
    + out:
    + vmci_ctx_put(context);
    + return result;
    +}
    +
    +/*
    + * Remove remote_cid from current context's list of contexts it is
    + * interested in getting notifications from/about.
    + */
    +int vmci_ctx_remove_notification(u32 context_id, u32 remote_cid)
    +{
    + struct vmci_ctx *context;
    + struct vmci_handle_list *notifier, *tmp;
    + struct vmci_handle handle;
    + bool found = false;
    +
    + context = vmci_ctx_get(context_id);
    + if (!context)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + handle = vmci_make_handle(remote_cid, VMCI_EVENT_HANDLER);
    +
    + spin_lock(&context->lock);
    + list_for_each_entry_safe(notifier, tmp,
    + &context->notifier_list, node) {
    + if (vmci_handle_is_equal(notifier->handle, handle)) {
    + list_del_rcu(&notifier->node);
    + context->n_notifiers--;
    + found = true;
    + break;
    + }
    + }
    + spin_unlock(&context->lock);
    +
    + if (found) {
    + synchronize_rcu();
    + kfree(notifier);
    + }
    +
    + vmci_ctx_put(context);
    +
    + return found ? VMCI_SUCCESS : VMCI_ERROR_NOT_FOUND;
    +}
    +
    +static int vmci_ctx_get_chkpt_notifiers(struct vmci_ctx *context,
    + u32 *buf_size, void **pbuf)
    +{
    + u32 *notifiers;
    + size_t data_size;
    + struct vmci_handle_list *entry;
    + int i = 0;
    +
    + if (context->n_notifiers == 0) {
    + *buf_size = 0;
    + *pbuf = NULL;
    + return VMCI_SUCCESS;
    + }
    +
    + data_size = context->n_notifiers * sizeof(*notifiers);
    + if (*buf_size < data_size) {
    + *buf_size = data_size;
    + return VMCI_ERROR_MORE_DATA;
    + }
    +
    + notifiers = kmalloc(data_size, GFP_ATOMIC); /* FIXME: want GFP_KERNEL */
    + if (!notifiers)
    + return VMCI_ERROR_NO_MEM;
    +
    + list_for_each_entry(entry, &context->notifier_list, node)
    + notifiers[i++] = entry->handle.context;
    +
    + *buf_size = data_size;
    + *pbuf = notifiers;
    + return VMCI_SUCCESS;
    +}
    +
    +static int vmci_ctx_get_chkpt_doorbells(struct vmci_ctx *context,
    + u32 *buf_size, void **pbuf)
    +{
    + struct dbell_cpt_state *dbells;
    + size_t n_doorbells;
    + int i;
    +
    + n_doorbells = vmci_handle_arr_get_size(context->doorbell_array);
    + if (n_doorbells > 0) {
    + size_t data_size = n_doorbells * sizeof(*dbells);
    + if (*buf_size < data_size) {
    + *buf_size = data_size;
    + return VMCI_ERROR_MORE_DATA;
    + }
    +
    + dbells = kmalloc(data_size, GFP_ATOMIC);
    + if (!dbells)
    + return VMCI_ERROR_NO_MEM;
    +
    + for (i = 0; i < n_doorbells; i++)
    + dbells[i].handle = vmci_handle_arr_get_entry(
    + context->doorbell_array, i);
    +
    + *buf_size = data_size;
    + *pbuf = dbells;
    + } else {
    + *buf_size = 0;
    + *pbuf = NULL;
    + }
    +
    + return VMCI_SUCCESS;
    +}
    +
    +/*
    + * Get current context's checkpoint state of given type.
    + */
    +int vmci_ctx_get_chkpt_state(u32 context_id,
    + u32 cpt_type,
    + u32 *buf_size,
    + void **pbuf)
    +{
    + struct vmci_ctx *context;
    + int result;
    +
    + context = vmci_ctx_get(context_id);
    + if (!context)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + spin_lock(&context->lock);
    +
    + switch (cpt_type) {
    + case VMCI_NOTIFICATION_CPT_STATE:
    + result = vmci_ctx_get_chkpt_notifiers(context, buf_size, pbuf);
    + break;
    +
    + case VMCI_WELLKNOWN_CPT_STATE:
    + /*
    + * For compatibility with VMX'en with VM to VM communication, we
    + * always return zero wellknown handles.
    + */
    +
    + *buf_size = 0;
    + *pbuf = NULL;
    + result = VMCI_SUCCESS;
    + break;
    +
    + case VMCI_DOORBELL_CPT_STATE:
    + result = vmci_ctx_get_chkpt_doorbells(context, buf_size, pbuf);
    + break;
    +
    + default:
    + pr_devel("Invalid cpt state (type=%d)\n", cpt_type);
    + result = VMCI_ERROR_INVALID_ARGS;
    + break;
    + }
    +
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    +
    + return result;
    +}
    +
    +/*
    + * Set current context's checkpoint state of given type.
    + */
    +int vmci_ctx_set_chkpt_state(u32 context_id,
    + u32 cpt_type,
    + u32 buf_size,
    + void *cpt_buf)
    +{
    + u32 i;
    + u32 current_id;
    + int result = VMCI_SUCCESS;
    + u32 num_ids = buf_size / sizeof(u32);
    +
    + if (cpt_type == VMCI_WELLKNOWN_CPT_STATE && num_ids > 0) {
    + /*
    + * We would end up here if VMX with VM to VM communication
    + * attempts to restore a checkpoint with wellknown handles.
    + */
    + pr_warn("Attempt to restore checkpoint with obsolete wellknown handles\n");
    + return VMCI_ERROR_OBSOLETE;
    + }
    +
    + if (cpt_type != VMCI_NOTIFICATION_CPT_STATE) {
    + pr_devel("Invalid cpt state (type=%d)\n", cpt_type);
    + return VMCI_ERROR_INVALID_ARGS;
    + }
    +
    + for (i = 0; i < num_ids && result == VMCI_SUCCESS; i++) {
    + current_id = ((u32 *)cpt_buf)[i];
    + result = vmci_ctx_add_notification(context_id, current_id);
    + if (result != VMCI_SUCCESS)
    + break;
    + }
    + if (result != VMCI_SUCCESS)
    + pr_devel("Failed to set cpt state (type=%d) (error=%d)\n",
    + cpt_type, result);
    +
    + return result;
    +}
    +
    +/*
    + * Retrieves the specified context's pending notifications in the
    + * form of a handle array. The handle arrays returned are the
    + * actual data - not a copy and should not be modified by the
    + * caller. They must be released using
    + * vmci_ctx_rcv_notifications_release.
    + */
    +int vmci_ctx_rcv_notifications_get(u32 context_id,
    + struct vmci_handle_arr **db_handle_array,
    + struct vmci_handle_arr **qp_handle_array)
    +{
    + struct vmci_ctx *context;
    + int result = VMCI_SUCCESS;
    +
    + context = vmci_ctx_get(context_id);
    + if (context == NULL)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + spin_lock(&context->lock);
    +
    + *db_handle_array = context->pending_doorbell_array;
    + context->pending_doorbell_array = vmci_handle_arr_create(0);
    + if (!context->pending_doorbell_array) {
    + context->pending_doorbell_array = *db_handle_array;
    + *db_handle_array = NULL;
    + result = VMCI_ERROR_NO_MEM;
    + }
    + *qp_handle_array = NULL;
    +
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    +
    + return result;
    +}
    +
    +/*
    + * Releases handle arrays with pending notifications previously
    + * retrieved using vmci_ctx_rcv_notifications_get. If the
    + * notifications were not successfully handed over to the guest,
    + * success must be false.
    + */
    +void vmci_ctx_rcv_notifications_release(u32 context_id,
    + struct vmci_handle_arr *db_handle_array,
    + struct vmci_handle_arr *qp_handle_array,
    + bool success)
    +{
    + struct vmci_ctx *context = vmci_ctx_get(context_id);
    +
    + spin_lock(&context->lock);
    + if (!success) {
    + struct vmci_handle handle;
    +
    + /*
    + * New notifications may have been added while we were not
    + * holding the context lock, so we transfer any new pending
    + * doorbell notifications to the old array, and reinstate the
    + * old array.
    + */
    +
    + handle = vmci_handle_arr_remove_tail(
    + context->pending_doorbell_array);
    + while (!vmci_handle_is_invalid(handle)) {
    + if (!vmci_handle_arr_has_entry(db_handle_array,
    + handle)) {
    + vmci_handle_arr_append_entry(
    + &db_handle_array, handle);
    + }
    + handle = vmci_handle_arr_remove_tail(
    + context->pending_doorbell_array);
    + }
    + vmci_handle_arr_destroy(context->pending_doorbell_array);
    + context->pending_doorbell_array = db_handle_array;
    + db_handle_array = NULL;
    + } else {
    + ctx_clear_notify_call(context);
    + }
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    +
    + if (db_handle_array)
    + vmci_handle_arr_destroy(db_handle_array);
    +
    + if (qp_handle_array)
    + vmci_handle_arr_destroy(qp_handle_array);
    +}
    +
    +/*
    + * Registers that a new doorbell handle has been allocated by the
    + * context. Only doorbell handles registered can be notified.
    + */
    +int vmci_ctx_dbell_create(u32 context_id, struct vmci_handle handle)
    +{
    + struct vmci_ctx *context;
    + int result;
    +
    + if (context_id == VMCI_INVALID_ID || vmci_handle_is_invalid(handle))
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + context = vmci_ctx_get(context_id);
    + if (context == NULL)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + spin_lock(&context->lock);
    + if (!vmci_handle_arr_has_entry(context->doorbell_array, handle)) {
    + vmci_handle_arr_append_entry(&context->doorbell_array, handle);
    + result = VMCI_SUCCESS;
    + } else {
    + result = VMCI_ERROR_DUPLICATE_ENTRY;
    + }
    +
    + spin_unlock(&context->lock);
    + vmci_ctx_put(context);
    +
    + return result;
    +}
    +
    +/*
    + * Unregisters a doorbell handle that was previously registered
    + * with vmci_ctx_dbell_create.
    + */
    +int vmci_ctx_dbell_destroy(u32 context_id, struct vmci_handle handle)
    +{
    + struct vmci_ctx *context;
    + struct vmci_handle removed_handle;
    +
    + if (context_id == VMCI_INVALID_ID || vmci_handle_is_invalid(handle))
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + context = vmci_ctx_get(context_id);
    + if (context == NULL)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + spin_lock(&context->lock);
    + removed_handle =
    + vmci_handle_arr_remove_entry(context->doorbell_array, handle);
    + vmci_handle_arr_remove_entry(context->pending_doorbell_array, handle);
    + spin_unlock(&context->lock);
    +
    + vmci_ctx_put(context);
    +
    + return vmci_handle_is_invalid(removed_handle) ?
    + VMCI_ERROR_NOT_FOUND : VMCI_SUCCESS;
    +}
    +
    +/*
    + * Unregisters all doorbell handles that were previously
    + * registered with vmci_ctx_dbell_create.
    + */
    +int vmci_ctx_dbell_destroy_all(u32 context_id)
    +{
    + struct vmci_ctx *context;
    + struct vmci_handle handle;
    +
    + if (context_id == VMCI_INVALID_ID)
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + context = vmci_ctx_get(context_id);
    + if (context == NULL)
    + return VMCI_ERROR_NOT_FOUND;
    +
    + spin_lock(&context->lock);
    + do {
    + struct vmci_handle_arr *arr = context->doorbell_array;
    + handle = vmci_handle_arr_remove_tail(arr);
    + } while (!vmci_handle_is_invalid(handle));
    + do {
    + struct vmci_handle_arr *arr = context->pending_doorbell_array;
    + handle = vmci_handle_arr_remove_tail(arr);
    + } while (!vmci_handle_is_invalid(handle));
    + spin_unlock(&context->lock);
    +
    + vmci_ctx_put(context);
    +
    + return VMCI_SUCCESS;
    +}
    +
    +/*
    + * Registers a notification of a doorbell handle initiated by the
    + * specified source context. The notification of doorbells are
    + * subject to the same isolation rules as datagram delivery. To
    + * allow host side senders of notifications a finer granularity
    + * of sender rights than those assigned to the sending context
    + * itself, the host context is required to specify a different
    + * set of privilege flags that will override the privileges of
    + * the source context.
    + */
    +int vmci_ctx_notify_dbell(u32 src_cid,
    + struct vmci_handle handle,
    + u32 src_priv_flags)
    +{
    + struct vmci_ctx *dst_context;
    + int result;
    +
    + if (vmci_handle_is_invalid(handle))
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + /* Get the target VM's VMCI context. */
    + dst_context = vmci_ctx_get(handle.context);
    + if (!dst_context) {
    + pr_devel("Invalid context (ID=0x%x)\n", handle.context);
    + return VMCI_ERROR_NOT_FOUND;
    + }
    +
    + if (src_cid != handle.context) {
    + u32 dst_priv_flags;
    +
    + if (VMCI_CONTEXT_IS_VM(src_cid) &&
    + VMCI_CONTEXT_IS_VM(handle.context)) {
    + pr_devel("Doorbell notification from VM to VM not supported (src=0x%x, dst=0x%x)\n",
    + src_cid, handle.context);
    + result = VMCI_ERROR_DST_UNREACHABLE;
    + goto out;
    + }
    +
    + result = vmci_dbell_get_priv_flags(handle, &dst_priv_flags);
    + if (result < VMCI_SUCCESS) {
    + pr_warn("Failed to get privilege flags for destination (handle=0x%x:0x%x)\n",
    + handle.context, handle.resource);
    + goto out;
    + }
    +
    + if (src_cid != VMCI_HOST_CONTEXT_ID ||
    + src_priv_flags == VMCI_NO_PRIVILEGE_FLAGS) {
    + src_priv_flags = vmci_context_get_priv_flags(src_cid);
    + }
    +
    + if (vmci_deny_interaction(src_priv_flags, dst_priv_flags)) {
    + result = VMCI_ERROR_NO_ACCESS;
    + goto out;
    + }
    + }
    +
    + if (handle.context == VMCI_HOST_CONTEXT_ID) {
    + result = vmci_dbell_host_context_notify(src_cid, handle);
    + } else {
    + spin_lock(&dst_context->lock);
    +
    + if (!vmci_handle_arr_has_entry(dst_context->doorbell_array,
    + handle)) {
    + result = VMCI_ERROR_NOT_FOUND;
    + } else {
    + if (!vmci_handle_arr_has_entry(
    + dst_context->pending_doorbell_array,
    + handle)) {
    + vmci_handle_arr_append_entry(
    + &dst_context->pending_doorbell_array,
    + handle);
    +
    + ctx_signal_notify(dst_context);
    + wake_up(&dst_context->host_context.wait_queue);
    +
    + }
    + result = VMCI_SUCCESS;
    + }
    + spin_unlock(&dst_context->lock);
    + }
    +
    + out:
    + vmci_ctx_put(dst_context);
    +
    + return result;
    +}
    +
    +bool vmci_ctx_supports_host_qp(struct vmci_ctx *context)
    +{
    + return context && context->user_version >= VMCI_VERSION_HOSTQP;
    +}
    +
    +/*
    + * Registers that a new queue pair handle has been allocated by
    + * the context.
    + */
    +int vmci_ctx_qp_create(struct vmci_ctx *context, struct vmci_handle handle)
    +{
    + int result;
    +
    + if (context == NULL || vmci_handle_is_invalid(handle))
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + if (!vmci_handle_arr_has_entry(context->queue_pair_array, handle)) {
    + vmci_handle_arr_append_entry(&context->queue_pair_array,
    + handle);
    + result = VMCI_SUCCESS;
    + } else {
    + result = VMCI_ERROR_DUPLICATE_ENTRY;
    + }
    +
    + return result;
    +}
    +
    +/*
    + * Unregisters a queue pair handle that was previously registered
    + * with vmci_ctx_qp_create.
    + */
    +int vmci_ctx_qp_destroy(struct vmci_ctx *context, struct vmci_handle handle)
    +{
    + struct vmci_handle hndl;
    +
    + if (context == NULL || vmci_handle_is_invalid(handle))
    + return VMCI_ERROR_INVALID_ARGS;
    +
    + hndl = vmci_handle_arr_remove_entry(context->queue_pair_array, handle);
    +
    + return vmci_handle_is_invalid(hndl) ?
    + VMCI_ERROR_NOT_FOUND : VMCI_SUCCESS;
    +}
    +
    +/*
    + * Determines whether a given queue pair handle is registered
    + * with the given context.
    + */
    +bool vmci_ctx_qp_exists(struct vmci_ctx *context, struct vmci_handle handle)
    +{
    + if (context == NULL || vmci_handle_is_invalid(handle))
    + return false;
    +
    + return vmci_handle_arr_has_entry(context->queue_pair_array, handle);
    +}
    +
    +/*
    + * vmci_context_get_priv_flags() - Retrieve privilege flags.
    + * @context_id: The context ID of the VMCI context.
    + *
    + * Retrieves privilege flags of the given VMCI context ID.
    + */
    +u32 vmci_context_get_priv_flags(u32 context_id)
    +{
    + if (vmci_host_code_active()) {
    + u32 flags;
    + struct vmci_ctx *context;
    +
    + context = vmci_ctx_get(context_id);
    + if (!context)
    + return VMCI_LEAST_PRIVILEGE_FLAGS;
    +
    + flags = context->priv_flags;
    + vmci_ctx_put(context);
    + return flags;
    + }
    + return VMCI_NO_PRIVILEGE_FLAGS;
    +}
    +EXPORT_SYMBOL_GPL(vmci_context_get_priv_flags);
    +
    +/*
    + * vmci_is_context_owner() - Determimnes if user is the context owner
    + * @context_id: The context ID of the VMCI context.
    + * @uid: The host user id (real kernel value).
    + *
    + * Determines whether a given UID is the owner of given VMCI context.
    + */
    +bool vmci_is_context_owner(u32 context_id, kuid_t uid)
    +{
    + bool is_owner = false;
    +
    + if (vmci_host_code_active()) {
    + struct vmci_ctx *context = vmci_ctx_get(context_id);
    + if (context) {
    + if (context->cred)
    + is_owner = uid_eq(context->cred->uid, uid);
    + vmci_ctx_put(context);
    + }
    + }
    +
    + return is_owner;
    +}
    +EXPORT_SYMBOL_GPL(vmci_is_context_owner);
    diff --git a/drivers/misc/vmw_vmci/vmci_context.h b/drivers/misc/vmw_vmci/vmci_context.h
    new file mode 100644
    index 0000000..24a88e6
    --- /dev/null
    +++ b/drivers/misc/vmw_vmci/vmci_context.h
    @@ -0,0 +1,182 @@
    +/*
    + * VMware VMCI driver (vmciContext.h)
    + *
    + * 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.
    + */
    +
    +#ifndef _VMCI_CONTEXT_H_
    +#define _VMCI_CONTEXT_H_
    +
    +#include <linux/vmw_vmci_defs.h>
    +#include <linux/atomic.h>
    +#include <linux/kref.h>
    +#include <linux/types.h>
    +#include <linux/wait.h>
    +
    +#include "vmci_handle_array.h"
    +#include "vmci_datagram.h"
    +
    +/* Used to determine what checkpoint state to get and set. */
    +enum {
    + VMCI_NOTIFICATION_CPT_STATE = 1,
    + VMCI_WELLKNOWN_CPT_STATE = 2,
    + VMCI_DG_OUT_STATE = 3,
    + VMCI_DG_IN_STATE = 4,
    + VMCI_DG_IN_SIZE_STATE = 5,
    + VMCI_DOORBELL_CPT_STATE = 6,
    +};
    +
    +/* Host specific struct used for signalling */
    +struct vmci_host {
    + wait_queue_head_t wait_queue;
    +};
    +
    +struct vmci_handle_list {
    + struct list_head node;
    + struct vmci_handle handle;
    +};
    +
    +struct vmci_ctx {
    + struct list_head list_item; /* For global VMCI list. */
    + u32 cid;
    + struct kref kref;
    + struct list_head datagram_queue; /* Head of per VM queue. */
    + u32 pending_datagrams;
    + size_t datagram_queue_size; /* Size of datagram queue in bytes. */
    +
    + /*
    + * Version of the code that created
    + * this context; e.g., VMX.
    + */
    + int user_version;
    + spinlock_t lock; /* Locks callQueue and handle_arrays. */
    +
    + /*
    + * queue_pairs attached to. The array of
    + * handles for queue pairs is accessed
    + * from the code for QP API, and there
    + * it is protected by the QP lock. It
    + * is also accessed from the context
    + * clean up path, which does not
    + * require a lock. VMCILock is not
    + * used to protect the QP array field.
    + */
    + struct vmci_handle_arr *queue_pair_array;
    +
    + /* Doorbells created by context. */
    + struct vmci_handle_arr *doorbell_array;
    +
    + /* Doorbells pending for context. */
    + struct vmci_handle_arr *pending_doorbell_array;
    +
    + /* Contexts current context is subscribing to. */
    + struct list_head notifier_list;
    + unsigned int n_notifiers;
    +
    + struct vmci_host host_context;
    + u32 priv_flags;
    +
    + const struct cred *cred;
    + bool *notify; /* Notify flag pointer - hosted only. */
    + struct page *notify_page; /* Page backing the notify UVA. */
    +};
    +
    +/* VMCINotifyAddRemoveInfo: Used to add/remove remote context notifications. */
    +struct vmci_ctx_info {
    + u32 remote_cid;
    + int result;
    +};
    +
    +/* VMCICptBufInfo: Used to set/get current context's checkpoint state. */
    +struct vmci_ctx_chkpt_buf_info {
    + u64 cpt_buf;
    + u32 cpt_type;
    + u32 buf_size;
    + s32 result;
    + u32 _pad;
    +};
    +
    +/*
    + * VMCINotificationReceiveInfo: Used to recieve pending notifications
    + * for doorbells and queue pairs.
    + */
    +struct vmci_ctx_notify_recv_info {
    + u64 db_handle_buf_uva;
    + u64 db_handle_buf_size;
    + u64 qp_handle_buf_uva;
    + u64 qp_handle_buf_size;
    + s32 result;
    + u32 _pad;
    +};
    +
    +/*
    + * Utilility function that checks whether two entities are allowed
    + * to interact. If one of them is restricted, the other one must
    + * be trusted.
    + */
    +static inline bool vmci_deny_interaction(u32 part_one, u32 part_two)
    +{
    + return ((part_one & VMCI_PRIVILEGE_FLAG_RESTRICTED) &&
    + !(part_two & VMCI_PRIVILEGE_FLAG_TRUSTED)) ||
    + ((part_two & VMCI_PRIVILEGE_FLAG_RESTRICTED) &&
    + !(part_one & VMCI_PRIVILEGE_FLAG_TRUSTED));
    +}
    +
    +struct vmci_ctx *vmci_ctx_create(u32 cid, u32 flags,
    + uintptr_t event_hnd, int version,
    + const struct cred *cred);
    +void vmci_ctx_destroy(struct vmci_ctx *context);
    +
    +bool vmci_ctx_supports_host_qp(struct vmci_ctx *context);
    +int vmci_ctx_enqueue_datagram(u32 cid, struct vmci_datagram *dg);
    +int vmci_ctx_dequeue_datagram(struct vmci_ctx *context,
    + size_t *max_size, struct vmci_datagram **dg);
    +int vmci_ctx_pending_datagrams(u32 cid, u32 *pending);
    +struct vmci_ctx *vmci_ctx_get(u32 cid);
    +void vmci_ctx_put(struct vmci_ctx *context);
    +bool vmci_ctx_exists(u32 cid);
    +
    +int vmci_ctx_add_notification(u32 context_id, u32 remote_cid);
    +int vmci_ctx_remove_notification(u32 context_id, u32 remote_cid);
    +int vmci_ctx_get_chkpt_state(u32 context_id, u32 cpt_type,
    + u32 *num_cids, void **cpt_buf_ptr);
    +int vmci_ctx_set_chkpt_state(u32 context_id, u32 cpt_type,
    + u32 num_cids, void *cpt_buf);
    +
    +int vmci_ctx_qp_create(struct vmci_ctx *context, struct vmci_handle handle);
    +int vmci_ctx_qp_destroy(struct vmci_ctx *context, struct vmci_handle handle);
    +bool vmci_ctx_qp_exists(struct vmci_ctx *context, struct vmci_handle handle);
    +
    +void vmci_ctx_check_signal_notify(struct vmci_ctx *context);
    +void vmci_ctx_unset_notify(struct vmci_ctx *context);
    +
    +int vmci_ctx_dbell_create(u32 context_id, struct vmci_handle handle);
    +int vmci_ctx_dbell_destroy(u32 context_id, struct vmci_handle handle);
    +int vmci_ctx_dbell_destroy_all(u32 context_id);
    +int vmci_ctx_notify_dbell(u32 cid, struct vmci_handle handle,
    + u32 src_priv_flags);
    +
    +int vmci_ctx_rcv_notifications_get(u32 context_id, struct vmci_handle_arr
    + **db_handle_array, struct vmci_handle_arr
    + **qp_handle_array);
    +void vmci_ctx_rcv_notifications_release(u32 context_id, struct vmci_handle_arr
    + *db_handle_array, struct vmci_handle_arr
    + *qp_handle_array, bool success);
    +
    +static inline u32 vmci_ctx_get_id(struct vmci_ctx *context)
    +{
    + if (!context)
    + return VMCI_INVALID_ID;
    + return context->cid;
    +}
    +
    +#endif /* _VMCI_CONTEXT_H_ */


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