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qemu/backends/cryptodev-vhost-user.c

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/*
* QEMU Cryptodev backend for QEMU cipher APIs
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
* Gonglei <arei.gonglei@huawei.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "hw/boards.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "hw/virtio/vhost-user.h"
#include "standard-headers/linux/virtio_crypto.h"
#include "sysemu/cryptodev-vhost.h"
#include "chardev/char-fe.h"
#include "sysemu/cryptodev-vhost-user.h"
/**
* @TYPE_CRYPTODEV_BACKEND_VHOST_USER:
* name of backend that uses vhost user server
*/
#define TYPE_CRYPTODEV_BACKEND_VHOST_USER "cryptodev-vhost-user"
#define CRYPTODEV_BACKEND_VHOST_USER(obj) \
OBJECT_CHECK(CryptoDevBackendVhostUser, \
(obj), TYPE_CRYPTODEV_BACKEND_VHOST_USER)
typedef struct CryptoDevBackendVhostUser {
CryptoDevBackend parent_obj;
VhostUserState *vhost_user;
CharBackend chr;
char *chr_name;
bool opened;
CryptoDevBackendVhost *vhost_crypto[MAX_CRYPTO_QUEUE_NUM];
} CryptoDevBackendVhostUser;
static int
cryptodev_vhost_user_running(
CryptoDevBackendVhost *crypto)
{
return crypto ? 1 : 0;
}
CryptoDevBackendVhost *
cryptodev_vhost_user_get_vhost(
CryptoDevBackendClient *cc,
CryptoDevBackend *b,
uint16_t queue)
{
CryptoDevBackendVhostUser *s =
CRYPTODEV_BACKEND_VHOST_USER(b);
assert(cc->type == CRYPTODEV_BACKEND_TYPE_VHOST_USER);
assert(queue < MAX_CRYPTO_QUEUE_NUM);
return s->vhost_crypto[queue];
}
static void cryptodev_vhost_user_stop(int queues,
CryptoDevBackendVhostUser *s)
{
size_t i;
for (i = 0; i < queues; i++) {
if (!cryptodev_vhost_user_running(s->vhost_crypto[i])) {
continue;
}
cryptodev_vhost_cleanup(s->vhost_crypto[i]);
s->vhost_crypto[i] = NULL;
}
}
static int
cryptodev_vhost_user_start(int queues,
CryptoDevBackendVhostUser *s)
{
CryptoDevBackendVhostOptions options;
CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
int max_queues;
size_t i;
for (i = 0; i < queues; i++) {
if (cryptodev_vhost_user_running(s->vhost_crypto[i])) {
continue;
}
options.opaque = s->vhost_user;
options.backend_type = VHOST_BACKEND_TYPE_USER;
options.cc = b->conf.peers.ccs[i];
s->vhost_crypto[i] = cryptodev_vhost_init(&options);
if (!s->vhost_crypto[i]) {
error_report("failed to init vhost_crypto for queue %zu", i);
goto err;
}
if (i == 0) {
max_queues =
cryptodev_vhost_get_max_queues(s->vhost_crypto[i]);
if (queues > max_queues) {
error_report("you are asking more queues than supported: %d",
max_queues);
goto err;
}
}
}
return 0;
err:
cryptodev_vhost_user_stop(i + 1, s);
return -1;
}
static Chardev *
cryptodev_vhost_claim_chardev(CryptoDevBackendVhostUser *s,
Error **errp)
{
Chardev *chr;
if (s->chr_name == NULL) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
"chardev", "a valid character device");
return NULL;
}
chr = qemu_chr_find(s->chr_name);
if (chr == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", s->chr_name);
return NULL;
}
return chr;
}
static void cryptodev_vhost_user_event(void *opaque, int event)
{
CryptoDevBackendVhostUser *s = opaque;
CryptoDevBackend *b = CRYPTODEV_BACKEND(s);
Error *err = NULL;
int queues = b->conf.peers.queues;
assert(queues < MAX_CRYPTO_QUEUE_NUM);
switch (event) {
case CHR_EVENT_OPENED:
if (cryptodev_vhost_user_start(queues, s) < 0) {
exit(1);
}
b->ready = true;
break;
case CHR_EVENT_CLOSED:
b->ready = false;
cryptodev_vhost_user_stop(queues, s);
break;
}
if (err) {
error_report_err(err);
}
}
static void cryptodev_vhost_user_init(
CryptoDevBackend *backend, Error **errp)
{
int queues = backend->conf.peers.queues;
size_t i;
Error *local_err = NULL;
Chardev *chr;
VhostUserState *user;
CryptoDevBackendClient *cc;
CryptoDevBackendVhostUser *s =
CRYPTODEV_BACKEND_VHOST_USER(backend);
chr = cryptodev_vhost_claim_chardev(s, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
s->opened = true;
for (i = 0; i < queues; i++) {
cc = cryptodev_backend_new_client(
"cryptodev-vhost-user", NULL);
cc->info_str = g_strdup_printf("cryptodev-vhost-user%zu to %s ",
i, chr->label);
cc->queue_index = i;
cc->type = CRYPTODEV_BACKEND_TYPE_VHOST_USER;
backend->conf.peers.ccs[i] = cc;
if (i == 0) {
if (!qemu_chr_fe_init(&s->chr, chr, &local_err)) {
error_propagate(errp, local_err);
return;
}
}
}
user = vhost_user_init();
if (!user) {
error_setg(errp, "Failed to init vhost_user");
return;
}
user->chr = &s->chr;
s->vhost_user = user;
qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
cryptodev_vhost_user_event, NULL, s, NULL, true);
backend->conf.crypto_services =
1u << VIRTIO_CRYPTO_SERVICE_CIPHER |
1u << VIRTIO_CRYPTO_SERVICE_HASH |
1u << VIRTIO_CRYPTO_SERVICE_MAC;
backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
backend->conf.max_size = UINT64_MAX;
backend->conf.max_cipher_key_len = VHOST_USER_MAX_CIPHER_KEY_LEN;
backend->conf.max_auth_key_len = VHOST_USER_MAX_AUTH_KEY_LEN;
}
static int64_t cryptodev_vhost_user_sym_create_session(
CryptoDevBackend *backend,
CryptoDevBackendSymSessionInfo *sess_info,
uint32_t queue_index, Error **errp)
{
CryptoDevBackendClient *cc =
backend->conf.peers.ccs[queue_index];
CryptoDevBackendVhost *vhost_crypto;
uint64_t session_id = 0;
int ret;
vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
if (vhost_crypto) {
struct vhost_dev *dev = &(vhost_crypto->dev);
ret = dev->vhost_ops->vhost_crypto_create_session(dev,
sess_info,
&session_id);
if (ret < 0) {
return -1;
} else {
return session_id;
}
}
return -1;
}
static int cryptodev_vhost_user_sym_close_session(
CryptoDevBackend *backend,
uint64_t session_id,
uint32_t queue_index, Error **errp)
{
CryptoDevBackendClient *cc =
backend->conf.peers.ccs[queue_index];
CryptoDevBackendVhost *vhost_crypto;
int ret;
vhost_crypto = cryptodev_vhost_user_get_vhost(cc, backend, queue_index);
if (vhost_crypto) {
struct vhost_dev *dev = &(vhost_crypto->dev);
ret = dev->vhost_ops->vhost_crypto_close_session(dev,
session_id);
if (ret < 0) {
return -1;
} else {
return 0;
}
}
return -1;
}
static void cryptodev_vhost_user_cleanup(
CryptoDevBackend *backend,
Error **errp)
{
CryptoDevBackendVhostUser *s =
CRYPTODEV_BACKEND_VHOST_USER(backend);
size_t i;
int queues = backend->conf.peers.queues;
CryptoDevBackendClient *cc;
cryptodev_vhost_user_stop(queues, s);
for (i = 0; i < queues; i++) {
cc = backend->conf.peers.ccs[i];
if (cc) {
cryptodev_backend_free_client(cc);
backend->conf.peers.ccs[i] = NULL;
}
}
if (s->vhost_user) {
vhost_user_cleanup(s->vhost_user);
g_free(s->vhost_user);
s->vhost_user = NULL;
}
}
static void cryptodev_vhost_user_set_chardev(Object *obj,
const char *value, Error **errp)
{
CryptoDevBackendVhostUser *s =
CRYPTODEV_BACKEND_VHOST_USER(obj);
if (s->opened) {
error_setg(errp, QERR_PERMISSION_DENIED);
} else {
g_free(s->chr_name);
s->chr_name = g_strdup(value);
}
}
static char *
cryptodev_vhost_user_get_chardev(Object *obj, Error **errp)
{
CryptoDevBackendVhostUser *s =
CRYPTODEV_BACKEND_VHOST_USER(obj);
Chardev *chr = qemu_chr_fe_get_driver(&s->chr);
if (chr && chr->label) {
return g_strdup(chr->label);
}
return NULL;
}
static void cryptodev_vhost_user_instance_int(Object *obj)
{
object_property_add_str(obj, "chardev",
cryptodev_vhost_user_get_chardev,
cryptodev_vhost_user_set_chardev,
NULL);
}
static void cryptodev_vhost_user_finalize(Object *obj)
{
CryptoDevBackendVhostUser *s =
CRYPTODEV_BACKEND_VHOST_USER(obj);
qemu_chr_fe_deinit(&s->chr, false);
g_free(s->chr_name);
}
static void
cryptodev_vhost_user_class_init(ObjectClass *oc, void *data)
{
CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
bc->init = cryptodev_vhost_user_init;
bc->cleanup = cryptodev_vhost_user_cleanup;
bc->create_session = cryptodev_vhost_user_sym_create_session;
bc->close_session = cryptodev_vhost_user_sym_close_session;
bc->do_sym_op = NULL;
}
static const TypeInfo cryptodev_vhost_user_info = {
.name = TYPE_CRYPTODEV_BACKEND_VHOST_USER,
.parent = TYPE_CRYPTODEV_BACKEND,
.class_init = cryptodev_vhost_user_class_init,
.instance_init = cryptodev_vhost_user_instance_int,
.instance_finalize = cryptodev_vhost_user_finalize,
.instance_size = sizeof(CryptoDevBackendVhostUser),
};
static void
cryptodev_vhost_user_register_types(void)
{
type_register_static(&cryptodev_vhost_user_info);
}
type_init(cryptodev_vhost_user_register_types);
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