xref: /openbmc/qemu/backends/cryptodev-vhost.c (revision bad5cfcd) 
1 /*
2  * QEMU Cryptodev backend for QEMU cipher APIs
3  *
4  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
5  *
6  * Authors:
7  *    Gonglei <arei.gonglei@huawei.com>
8  *    Jay Zhou <jianjay.zhou@huawei.com>
9  *
10  * This library is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * This library is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
22  *
23  */
24 
25 #include "qemu/osdep.h"
26 #include "hw/virtio/virtio-bus.h"
27 #include "sysemu/cryptodev-vhost.h"
28 
29 #ifdef CONFIG_VHOST_CRYPTO
30 #include "qapi/error.h"
31 #include "qemu/error-report.h"
32 #include "hw/virtio/virtio-crypto.h"
33 #include "sysemu/cryptodev-vhost-user.h"
34 
35 uint64_t
36 cryptodev_vhost_get_max_queues(
37                         CryptoDevBackendVhost *crypto)
38 {
39     return crypto->dev.max_queues;
40 }
41 
42 void cryptodev_vhost_cleanup(CryptoDevBackendVhost *crypto)
43 {
44     vhost_dev_cleanup(&crypto->dev);
45     g_free(crypto);
46 }
47 
48 struct CryptoDevBackendVhost *
49 cryptodev_vhost_init(
50              CryptoDevBackendVhostOptions *options)
51 {
52     int r;
53     CryptoDevBackendVhost *crypto;
54     Error *local_err = NULL;
55 
56     crypto = g_new(CryptoDevBackendVhost, 1);
57     crypto->dev.max_queues = 1;
58     crypto->dev.nvqs = 1;
59     crypto->dev.vqs = crypto->vqs;
60 
61     crypto->cc = options->cc;
62 
63     crypto->dev.protocol_features = 0;
64     crypto->backend = -1;
65 
66     /* vhost-user needs vq_index to initiate a specific queue pair */
67     crypto->dev.vq_index = crypto->cc->queue_index * crypto->dev.nvqs;
68 
69     r = vhost_dev_init(&crypto->dev, options->opaque, options->backend_type, 0,
70                        &local_err);
71     if (r < 0) {
72         error_report_err(local_err);
73         goto fail;
74     }
75 
76     return crypto;
77 fail:
78     g_free(crypto);
79     return NULL;
80 }
81 
82 static int
83 cryptodev_vhost_start_one(CryptoDevBackendVhost *crypto,
84                                   VirtIODevice *dev)
85 {
86     int r;
87 
88     crypto->dev.nvqs = 1;
89     crypto->dev.vqs = crypto->vqs;
90 
91     r = vhost_dev_enable_notifiers(&crypto->dev, dev);
92     if (r < 0) {
93         goto fail_notifiers;
94     }
95 
96     r = vhost_dev_start(&crypto->dev, dev, false);
97     if (r < 0) {
98         goto fail_start;
99     }
100 
101     return 0;
102 
103 fail_start:
104     vhost_dev_disable_notifiers(&crypto->dev, dev);
105 fail_notifiers:
106     return r;
107 }
108 
109 static void
110 cryptodev_vhost_stop_one(CryptoDevBackendVhost *crypto,
111                                  VirtIODevice *dev)
112 {
113     vhost_dev_stop(&crypto->dev, dev, false);
114     vhost_dev_disable_notifiers(&crypto->dev, dev);
115 }
116 
117 CryptoDevBackendVhost *
118 cryptodev_get_vhost(CryptoDevBackendClient *cc,
119                             CryptoDevBackend *b,
120                             uint16_t queue)
121 {
122     CryptoDevBackendVhost *vhost_crypto = NULL;
123 
124     if (!cc) {
125         return NULL;
126     }
127 
128     switch (cc->type) {
129 #if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
130     case QCRYPTODEV_BACKEND_TYPE_VHOST_USER:
131         vhost_crypto = cryptodev_vhost_user_get_vhost(cc, b, queue);
132         break;
133 #endif
134     default:
135         break;
136     }
137 
138     return vhost_crypto;
139 }
140 
141 static void
142 cryptodev_vhost_set_vq_index(CryptoDevBackendVhost *crypto,
143                                      int vq_index)
144 {
145     crypto->dev.vq_index = vq_index;
146 }
147 
148 static int
149 vhost_set_vring_enable(CryptoDevBackendClient *cc,
150                             CryptoDevBackend *b,
151                             uint16_t queue, int enable)
152 {
153     CryptoDevBackendVhost *crypto =
154                        cryptodev_get_vhost(cc, b, queue);
155     const VhostOps *vhost_ops;
156 
157     cc->vring_enable = enable;
158 
159     if (!crypto) {
160         return 0;
161     }
162 
163     vhost_ops = crypto->dev.vhost_ops;
164     if (vhost_ops->vhost_set_vring_enable) {
165         return vhost_ops->vhost_set_vring_enable(&crypto->dev, enable);
166     }
167 
168     return 0;
169 }
170 
171 int cryptodev_vhost_start(VirtIODevice *dev, int total_queues)
172 {
173     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
174     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
175     VirtioBusState *vbus = VIRTIO_BUS(qbus);
176     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
177     int r, e;
178     int i;
179     CryptoDevBackend *b = vcrypto->cryptodev;
180     CryptoDevBackendVhost *vhost_crypto;
181     CryptoDevBackendClient *cc;
182 
183     if (!k->set_guest_notifiers) {
184         error_report("binding does not support guest notifiers");
185         return -ENOSYS;
186     }
187 
188     for (i = 0; i < total_queues; i++) {
189         cc = b->conf.peers.ccs[i];
190 
191         vhost_crypto = cryptodev_get_vhost(cc, b, i);
192         cryptodev_vhost_set_vq_index(vhost_crypto, i);
193 
194         /* Suppress the masking guest notifiers on vhost user
195          * because vhost user doesn't interrupt masking/unmasking
196          * properly.
197          */
198         if (cc->type == QCRYPTODEV_BACKEND_TYPE_VHOST_USER) {
199             dev->use_guest_notifier_mask = false;
200         }
201      }
202 
203     r = k->set_guest_notifiers(qbus->parent, total_queues, true);
204     if (r < 0) {
205         error_report("error binding guest notifier: %d", -r);
206         goto err;
207     }
208 
209     for (i = 0; i < total_queues; i++) {
210         cc = b->conf.peers.ccs[i];
211 
212         vhost_crypto = cryptodev_get_vhost(cc, b, i);
213         r = cryptodev_vhost_start_one(vhost_crypto, dev);
214 
215         if (r < 0) {
216             goto err_start;
217         }
218 
219         if (cc->vring_enable) {
220             /* restore vring enable state */
221             r = vhost_set_vring_enable(cc, b, i, cc->vring_enable);
222 
223             if (r < 0) {
224                 goto err_start;
225             }
226         }
227     }
228 
229     return 0;
230 
231 err_start:
232     while (--i >= 0) {
233         cc = b->conf.peers.ccs[i];
234         vhost_crypto = cryptodev_get_vhost(cc, b, i);
235         cryptodev_vhost_stop_one(vhost_crypto, dev);
236     }
237     e = k->set_guest_notifiers(qbus->parent, total_queues, false);
238     if (e < 0) {
239         error_report("vhost guest notifier cleanup failed: %d", e);
240     }
241 err:
242     return r;
243 }
244 
245 void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues)
246 {
247     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
248     VirtioBusState *vbus = VIRTIO_BUS(qbus);
249     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
250     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
251     CryptoDevBackend *b = vcrypto->cryptodev;
252     CryptoDevBackendVhost *vhost_crypto;
253     CryptoDevBackendClient *cc;
254     size_t i;
255     int r;
256 
257     for (i = 0; i < total_queues; i++) {
258         cc = b->conf.peers.ccs[i];
259 
260         vhost_crypto = cryptodev_get_vhost(cc, b, i);
261         cryptodev_vhost_stop_one(vhost_crypto, dev);
262     }
263 
264     r = k->set_guest_notifiers(qbus->parent, total_queues, false);
265     if (r < 0) {
266         error_report("vhost guest notifier cleanup failed: %d", r);
267     }
268     assert(r >= 0);
269 }
270 
271 void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev,
272                                            int queue,
273                                            int idx, bool mask)
274 {
275     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
276     CryptoDevBackend *b = vcrypto->cryptodev;
277     CryptoDevBackendVhost *vhost_crypto;
278     CryptoDevBackendClient *cc;
279 
280     assert(queue < MAX_CRYPTO_QUEUE_NUM);
281 
282     cc = b->conf.peers.ccs[queue];
283     vhost_crypto = cryptodev_get_vhost(cc, b, queue);
284 
285     vhost_virtqueue_mask(&vhost_crypto->dev, dev, idx, mask);
286 }
287 
288 bool cryptodev_vhost_virtqueue_pending(VirtIODevice *dev,
289                                               int queue, int idx)
290 {
291     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
292     CryptoDevBackend *b = vcrypto->cryptodev;
293     CryptoDevBackendVhost *vhost_crypto;
294     CryptoDevBackendClient *cc;
295 
296     assert(queue < MAX_CRYPTO_QUEUE_NUM);
297 
298     cc = b->conf.peers.ccs[queue];
299     vhost_crypto = cryptodev_get_vhost(cc, b, queue);
300 
301     return vhost_virtqueue_pending(&vhost_crypto->dev, idx);
302 }
303 
304 #else
305 uint64_t
306 cryptodev_vhost_get_max_queues(CryptoDevBackendVhost *crypto)
307 {
308     return 0;
309 }
310 
311 void cryptodev_vhost_cleanup(CryptoDevBackendVhost *crypto)
312 {
313 }
314 
315 struct CryptoDevBackendVhost *
316 cryptodev_vhost_init(CryptoDevBackendVhostOptions *options)
317 {
318     return NULL;
319 }
320 
321 CryptoDevBackendVhost *
322 cryptodev_get_vhost(CryptoDevBackendClient *cc,
323                     CryptoDevBackend *b,
324                     uint16_t queue)
325 {
326     return NULL;
327 }
328 
329 int cryptodev_vhost_start(VirtIODevice *dev, int total_queues)
330 {
331     return -1;
332 }
333 
334 void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues)
335 {
336 }
337 
338 void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev,
339                                     int queue,
340                                     int idx, bool mask)
341 {
342 }
343 
344 bool cryptodev_vhost_virtqueue_pending(VirtIODevice *dev,
345                                        int queue, int idx)
346 {
347     return false;
348 }
349 #endif
350