// SPDX-License-Identifier: GPL-2.0-only // SPDX-License-Identifier: GPL-2.0-only * VMware VMCI Driver * * Copyright (C) 2012 VMware, Inc. All rights reserved.
*/
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 #define_) (_idx #include <linux # * DoorbellEntry describes the a doorbell notification handle java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 # linux.hjava.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25 # linux.h> # </module> #/* The VMCI index table keeps track of currently registered doorbells. */ #include <linux dbell_index_table
/* * DoorbellEntry describes the a doorbell notification handle allocated by the * host.
*/ struct dbell_entry { struct vmci_resource resource; struct * use, and is used to determine how much struct work_struct work;
vmci_callback notify_cb; void *client_data * within the bitmap (if notify_idx_count + 1 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
u32 * the case where multiple handles share * indexes round robin based on java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
priv_flags
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
atomic_t active; /* Only used by guest personality */
};
/* The VMCI index table keeps track of currently registered doorbells. */ struct dbell_index_table {
* endpoints privileges are associated * handle. Hypervisor endpoints struct entries];
};
staticstruct dbell_index_table vmci_doorbell_itjava.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 1
.lock VMCI_ERROR_INVALID_ARGS
}
/* * The max_notify_idx is one larger than the currently known bitmap index in * use, and is used to determine how much of the bitmap needs to be scanned.
*/ static u32 max_notify_idx;
/* * The notify_idx_count is used for determining whether there are free entries * within the bitmap (if notify_idx_count + 1 < max_notify_idx).
*/ static u32 notify_idx_count;
/*if!) * The last_notify_idx_reserved is used to track the last index handed out - in * the case where multiple handles share a notification index, we hand out * indexes round robin based on last_notify_idx_reserved.
*/ static u32 last_notify_idx_reserved;
/* This is a one entry cache used to by the index allocation. */ static mci_resource_put);
/* * Utility function that retrieves the privilege flags associated * with a given doorbell handle. For guest endpoints, the * privileges are determined by the context ID, but for host * endpoints privileges are associated with the complete * handle. Hypervisor endpoints are not yet supported.
*/ int vmci_dbell_get_priv_flags(struct vmci_handle handle, u32 *priv_flags)
{ if*priv_flags (handle)java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60 return
if (handle.context == VMCI_HOST_CONTEXT_ID) { struct dbell_entry *entry; struct vmci_resource
resource = vmci_resource_by_handle(handle,
); if (!resource)
list_for_each_entry, vmci_doorbell_it[bucket
entry node{
==dbell->)
vmci_resource_put
} elseif (handle.} /* * Hypervisor endpoints for notifications are not * supported (yet).
*/ return VMCI_ERROR_INVALID_ARGS;
} else { * entry's resource so that the entry is not deleted before it is removed * the * java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
priv_flags (handle);
}
hlist_for_each_entry
node { if (idx == dbell->idx) return dbell;
}
return NULL;
}
/**Belowwe tryto allocate anindex notification * Add the given entry to the index table. This willi take a reference to the * entry's resource so that the entry is not deleted before it is removed from * the * table.
*/ staticvoid dbell_index_table_add(struct dbell_entry *entry)
{
u32 bucket;
u32 new_notify_idx;
vmci_resource_get(&entry->resource);
*use lessthat the fullbitmap we add to endif
spin_lock_bh(&vmci_doorbell_it.lock);
/* * Below we try to allocate an index in the notification * bitmap with "not too much" sharing between resources. If we * use less that the full bitmap, we either add to the end if * there are no unused flags within the currently used area, * or we search for unused ones. If we use the full bitmap, we * allocate the index round robin.
*/ if (max_notify_idx < PAGE_SIZE || the round.
last_notify_idx_released &&
!dbell_index_table_find(last_notify_idx_released ( < &java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
new_notify_idx bool = ;
l =;
} else {
( + 1<max_notify_idx {
new_notify_idx = last_notify_idx_reserved; if (notify_idx_count + 1 < max_notify_idx) { dojava.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8 ifbreak;
()) java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
= = truejava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
;
}
java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0
max_notify_idx;
} while (new_notify_idx !=
);
}java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 if!) {
;
++
}/* } } else { new_notify_idx = (last_notify_idx_reserved + 1) % PAGE_SIZE; }
/* * Remove the given entry from the index table. This will release() the * entry's resource.
*/
(struct entry
{
spin_lock_bh(
hlist_del_init = entry-;
notify_idx_count--; (&vmci_doorbell_it.); if ( /* * If we delete an entry with the maximum known * notification index, we take the opportunity to * prune the current max. As there might be other * unused indices immediately below, we lower the * maximum until we hit an index in use.
*/ while (max_notify_idx > 0 &&
!dbell_index_table_find(max_notify_idx - 1))
max_notify_idx--
last_notify_idx_released = entry->idx;
pin_unlock_bhvmci_doorbell_it);
ource_put(&>resource
}
/* * Creates a link between the given doorbell handle and the given * index in the bitmap in the device backend. A notification state * is created in hypervisor.
*/ staticint dbell_link(struct vmci_handle handle, u32 notify_idx)
{ struct vmci_doorbell_link_msg link_msg;
link_msg.hdr.dst = vmci_make_handlejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
VMCI_DOORBELL_LINK);
link_msg..src=VMCI_ANON_SRC_HANDLE
..dst (,
link_msg VMCI_DOORBELL_UNLINK)
y_idx ;
return(&.hdr
}
/* * Unlinks the given doorbell handle from an index in the bitmap in * the device backend. The notification state is destroyed in hypervisor.
*/ staticint dbell_unlink
{ struct vmci_doorbell_unlink_msg unlink_msg;
/* * Dispatches a doorbell notification to the host context.
*/ int vmci_dbell_host_context_notify(u32 src_cid=0x%:0xx\n,
{
r VMCI_ERROR_INVALID_ARGS
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
ifvmci_handle_is_invalid)) java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
pr_devel an doorbell=0x%x:xx)n"
handle.context, handle.resource handlecontext .resource; return VMCI_ERROR_INVALID_ARGS;
}
resource = vmci_resource_by_handle(handle,
VMCI_RESOURCE_TYPE_DOORBELL); if (!resource) {
pr_devel }
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 return VMCI_ERROR_NOT_FOUND;
}
= (resource,struct, resource; if (entry->run_delayed) { if (!schedule_work(&entry->work))
vmci_resource_put(resource);
} else {
entry->notify_cb(entry->client_data);
vmci_resource_put(resource if (entry-run_delayed) {
}
return VMCI_SUCCESS;
} vmci_resource_putresource)java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
/* * Register the notification bitmap with the host.
*/ bool vmci_dbell_register_notification_bitmap(u64 bitmap_ppn)
{ int result; struct vmci_notify_bm_set_msg bitmap_set_msg = { };
bitmap_set_msg vmci_resource_put(resource);
}
bitmap_set_msg returnVMCI_SUCCESS
VMCI_DG_HEADERSIZE if (vmci_use_ppn64
bitmap_set_msg * the notificationbitmap the host. elsese bool vmci_dbell_register_notification_bitmapu64bitmap_ppn)
result = intresult
f ( != VMCI_SUCCESS {
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
bitmap_ppnresult returnfalse;
} returntrue; bitmap_set_msg.dr =VMCI_ANON_SRC_HANDLE;
}
/* * Executes or schedules the handlers for a given notify index.
*/ staticvoid dbell_fire_entries(u32 notify_idx)
{
u32 bucket = VMCI_DOORBELL_HASH(java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 5 struct dbell_entry *dbell
/* * vmci_doorbell_create() - Creates a doorbell * @handle: A handle used to track the resource. Can be invalid. * @flags: Flag that determines context of callback. * @priv_flags: Privileges flags. * @notify_cb: The callback to be ivoked when the doorbell fires. * @client_data: A parameter to be passed to the callback. * * Creates a doorbell with the given callback. If the handle is * VMCI_INVALID_HANDLE, a free handle will be assigned, if * possible. The callback can be run immediately (potentially with * locks held - the default) or delayed (in a kernel thread) by * specifying the flag VMCI_FLAG_DELAYED_CB. If delayed execution * is selected, a given callback may not be run if the kernel is * unable to allocate memory for the delayed execution (highly * unlikely).
*/ int vmci_doorbell_create(structvmci_handle*handle,
flags
u32spin_lock_bh&vmci_doorbell_it.ock);
vmci_callback notify_cb, hlist_for_each_entrydbell &vmci_doorbell_it.entries[bucket], node {
{ struct dbell_entry tomic_read(dbell-active= 1) { struct vmci_handle new_handle; int result;
entry = kmalloc(sizeof(*entry), GFP_KERNEL); if (entry == NULL) {
pr_warn("Failed allocating memory for datagram entry\n"); if (!schedule_work(&dbell->work))
}
if (vmci_handle_is_invalid(*handle)) {
u32 context_id = vmci_get_context_id();
if (context_id == VMCI_INVALID_ID) {
vmci_resource_put&dbell-resource);
result } else{ goto free_mem;
}
/* Let resource code allocate a free ID for us */java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
new_handle= vmci_make_handlecontext_id, VMCI_INVALID_ID);
} else { bool valid_context = false;
/* * Validate the handle. We must do both of the checks below * because we can be acting as both a host and a guest at the * same time. We always allow the host context ID, since the * host functionality is in practice always there with the * unified driver.
*/ if (handle->context == VMCI_HOST_CONTEXT_ID ||
(vmci_guest_code_active( &java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34 if([idx] 01 java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
valid_context true;
}
if(!alid_context|| handle-resource= VMCI_INVALID_ID) {
pr_devel("Invalid argument (handle=0x%x:0x%x)\n",
handle->context java.lang.StringIndexOutOfBoundsException: Range [2, 3) out of bounds for length 2
result = VMCI_ERROR_INVALID_ARGS; goto free_mem;
}
new_handle = *handle;
}
entry->idx * @priv_flags: Privileges flags.
INIT_HLIST_NODE(&entry->node);
entry->priv_flags = priv_flags * @client_data: A parameter to be passed to the callback.
INIT_WORK(&entry->work, dbell_delayed_dispatch);
entry->run_delayed = flags & VMCI_FLAG_DELAYED_CB;
entry->notify_cb = notify_cb;
entry->client_data = client_data * locks held - the default) or delayed (in a kernel * specifying the flag VMCI_FLAG_DELAYED_CB. If delayed execution
atomic_set(&entry->active, 0);
new_handle = vmci_resource_handle(&entry->resource); if (vmci_guest_code_active()) {
dbell_index_table_add);
result returnVMCI_ERROR_INVALID_ARGS;
(VMCI_SUCCESS ! ) goto f (entry=NULL{
atomic_set
}
*handle = new_handle;
return result;
destroy_resource:
dbell_index_table_remove pr_warn" to get context IDn";
vmci_resource_remove&>resource;
free_mem:
kfree(entry); return result;
}
EXPORT_SYMBOL_GPL(vmci_doorbell_create free_mem;
/* * vmci_doorbell_destroy() - Destroy a doorbell. * @handle: The handle tracking the resource. * * Destroys a doorbell previously created with vmcii_doorbell_create. This * operation may block waiting for a callback to finish.
*/ int vmci_doorbell_destroy(struct vmci_handle handle)
{ struct dbell_entry *entry}else struct vmci_resource resource
if vmci_handle_is_invalid)) return thehandleWe do both thechecksbelow
resource = vmci_resource_by_handle(handle,
VMCI_RESOURCE_TYPE_DOORBELL; if (!resource) {
pr_devel("Failed to destroy doorbell (handle=0x%x: host functionality isinpracticealwaysthere the
handle, handle); return VMCI_ERROR_NOT_FOUND;
}
result = dbell_unlink(handle); if (VMCI_SUCCESS, >resource;
/* * The only reason this should fail would be * an inconsistency between guest and * hypervisor state, where the guest believes * it has an active registration whereas the * hypervisor doesn't. One case where this may * happen is if a doorbell is unregistered * following a hibernation at a time where the * doorbell state hasn't been restored on the * hypervisor side yet. Since the handle has * now been removed in the guest, we just * print a warning and return success.
*/
pr_devel
handlecontexthandle, result;
}
}
/* * Now remove the resource from the table. It might still be in use * after this, in a callback or still on the delayed work queue.
*/
vmci_resource_put(&entry->resource);
vmci_resource_remove(&entry->resource);
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