cryptodev: add vhost-user as a new cryptodev backend

Usage:
 -chardev socket,id=charcrypto0,path=/path/to/your/socket
 -object cryptodev-vhost-user,id=cryptodev0,chardev=charcrypto0
 -device virtio-crypto-pci,id=crypto0,cryptodev=cryptodev0

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Jay Zhou <jianjay.zhou@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 331 insertions, 0 deletions

diff --git a/backends/cryptodev-vhost-user.c b/backends/cryptodev-vhost-user.c
new file mode 100644
index 0000000000..93c3f10a8f
--- /dev/null
+++ b/backends/cryptodev-vhost-user.c
@@ -0,0 +1,331 @@
+/*
+ * 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 "standard-headers/linux/virtio_crypto.h"
+#include "sysemu/cryptodev-vhost.h"
+#include "chardev/char-fe.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;
+
+    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;
+}
+
+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->chr;
+        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;
+    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;
+
+        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;
+            }
+        }
+    }
+
+    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;
+}
+
+static int64_t cryptodev_vhost_user_sym_create_session(
+           CryptoDevBackend *backend,
+           CryptoDevBackendSymSessionInfo *sess_info,
+           uint32_t queue_index, Error **errp)
+{
+    return 0;
+}
+
+static int cryptodev_vhost_user_sym_close_session(
+           CryptoDevBackend *backend,
+           uint64_t session_id,
+           uint32_t queue_index, Error **errp)
+{
+    return 0;
+}
+
+static int cryptodev_vhost_user_sym_operation(
+                 CryptoDevBackend *backend,
+                 CryptoDevBackendSymOpInfo *op_info,
+                 uint32_t queue_index, Error **errp)
+{
+    return VIRTIO_CRYPTO_OK;
+}
+
+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;
+        }
+    }
+}
+
+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 = cryptodev_vhost_user_sym_operation;
+}
+
+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);