xref: /openbmc/qemu/backends/cryptodev-vhost.c (revision dc5bd18f) 
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 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 "qapi/qmp/qerror.h"
32 #include "qemu/error-report.h"
33 #include "hw/virtio/virtio-crypto.h"
34 #include "sysemu/cryptodev-vhost-user.h"
35 
36 uint64_t
37 cryptodev_vhost_get_max_queues(
38                         CryptoDevBackendVhost *crypto)
39 {
40     return crypto->dev.max_queues;
41 }
42 
43 void cryptodev_vhost_cleanup(CryptoDevBackendVhost *crypto)
44 {
45     vhost_dev_cleanup(&crypto->dev);
46     g_free(crypto);
47 }
48 
49 struct CryptoDevBackendVhost *
50 cryptodev_vhost_init(
51              CryptoDevBackendVhostOptions *options)
52 {
53     int r;
54     CryptoDevBackendVhost *crypto;
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     if (r < 0) {
71         goto fail;
72     }
73 
74     return crypto;
75 fail:
76     g_free(crypto);
77     return NULL;
78 }
79 
80 static int
81 cryptodev_vhost_start_one(CryptoDevBackendVhost *crypto,
82                                   VirtIODevice *dev)
83 {
84     int r;
85 
86     crypto->dev.nvqs = 1;
87     crypto->dev.vqs = crypto->vqs;
88 
89     r = vhost_dev_enable_notifiers(&crypto->dev, dev);
90     if (r < 0) {
91         goto fail_notifiers;
92     }
93 
94     r = vhost_dev_start(&crypto->dev, dev);
95     if (r < 0) {
96         goto fail_start;
97     }
98 
99     return 0;
100 
101 fail_start:
102     vhost_dev_disable_notifiers(&crypto->dev, dev);
103 fail_notifiers:
104     return r;
105 }
106 
107 static void
108 cryptodev_vhost_stop_one(CryptoDevBackendVhost *crypto,
109                                  VirtIODevice *dev)
110 {
111     vhost_dev_stop(&crypto->dev, dev);
112     vhost_dev_disable_notifiers(&crypto->dev, dev);
113 }
114 
115 CryptoDevBackendVhost *
116 cryptodev_get_vhost(CryptoDevBackendClient *cc,
117                             CryptoDevBackend *b,
118                             uint16_t queue)
119 {
120     CryptoDevBackendVhost *vhost_crypto = NULL;
121 
122     if (!cc) {
123         return NULL;
124     }
125 
126     switch (cc->type) {
127 #if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
128     case CRYPTODEV_BACKEND_TYPE_VHOST_USER:
129         vhost_crypto = cryptodev_vhost_user_get_vhost(cc, b, queue);
130         break;
131 #endif
132     default:
133         break;
134     }
135 
136     return vhost_crypto;
137 }
138 
139 static void
140 cryptodev_vhost_set_vq_index(CryptoDevBackendVhost *crypto,
141                                      int vq_index)
142 {
143     crypto->dev.vq_index = vq_index;
144 }
145 
146 static int
147 vhost_set_vring_enable(CryptoDevBackendClient *cc,
148                             CryptoDevBackend *b,
149                             uint16_t queue, int enable)
150 {
151     CryptoDevBackendVhost *crypto =
152                        cryptodev_get_vhost(cc, b, queue);
153     const VhostOps *vhost_ops;
154 
155     cc->vring_enable = enable;
156 
157     if (!crypto) {
158         return 0;
159     }
160 
161     vhost_ops = crypto->dev.vhost_ops;
162     if (vhost_ops->vhost_set_vring_enable) {
163         return vhost_ops->vhost_set_vring_enable(&crypto->dev, enable);
164     }
165 
166     return 0;
167 }
168 
169 int cryptodev_vhost_start(VirtIODevice *dev, int total_queues)
170 {
171     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
172     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
173     VirtioBusState *vbus = VIRTIO_BUS(qbus);
174     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
175     int r, e;
176     int i;
177     CryptoDevBackend *b = vcrypto->cryptodev;
178     CryptoDevBackendVhost *vhost_crypto;
179     CryptoDevBackendClient *cc;
180 
181     if (!k->set_guest_notifiers) {
182         error_report("binding does not support guest notifiers");
183         return -ENOSYS;
184     }
185 
186     for (i = 0; i < total_queues; i++) {
187         cc = b->conf.peers.ccs[i];
188 
189         vhost_crypto = cryptodev_get_vhost(cc, b, i);
190         cryptodev_vhost_set_vq_index(vhost_crypto, i);
191 
192         /* Suppress the masking guest notifiers on vhost user
193          * because vhost user doesn't interrupt masking/unmasking
194          * properly.
195          */
196         if (cc->type == CRYPTODEV_BACKEND_TYPE_VHOST_USER) {
197             dev->use_guest_notifier_mask = false;
198         }
199      }
200 
201     r = k->set_guest_notifiers(qbus->parent, total_queues, true);
202     if (r < 0) {
203         error_report("error binding guest notifier: %d", -r);
204         goto err;
205     }
206 
207     for (i = 0; i < total_queues; i++) {
208         cc = b->conf.peers.ccs[i];
209 
210         vhost_crypto = cryptodev_get_vhost(cc, b, i);
211         r = cryptodev_vhost_start_one(vhost_crypto, dev);
212 
213         if (r < 0) {
214             goto err_start;
215         }
216 
217         if (cc->vring_enable) {
218             /* restore vring enable state */
219             r = vhost_set_vring_enable(cc, b, i, cc->vring_enable);
220 
221             if (r < 0) {
222                 goto err_start;
223             }
224         }
225     }
226 
227     return 0;
228 
229 err_start:
230     while (--i >= 0) {
231         cc = b->conf.peers.ccs[i];
232         vhost_crypto = cryptodev_get_vhost(cc, b, i);
233         cryptodev_vhost_stop_one(vhost_crypto, dev);
234     }
235     e = k->set_guest_notifiers(qbus->parent, total_queues, false);
236     if (e < 0) {
237         error_report("vhost guest notifier cleanup failed: %d", e);
238     }
239 err:
240     return r;
241 }
242 
243 void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues)
244 {
245     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
246     VirtioBusState *vbus = VIRTIO_BUS(qbus);
247     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
248     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
249     CryptoDevBackend *b = vcrypto->cryptodev;
250     CryptoDevBackendVhost *vhost_crypto;
251     CryptoDevBackendClient *cc;
252     size_t i;
253     int r;
254 
255     for (i = 0; i < total_queues; i++) {
256         cc = b->conf.peers.ccs[i];
257 
258         vhost_crypto = cryptodev_get_vhost(cc, b, i);
259         cryptodev_vhost_stop_one(vhost_crypto, dev);
260     }
261 
262     r = k->set_guest_notifiers(qbus->parent, total_queues, false);
263     if (r < 0) {
264         error_report("vhost guest notifier cleanup failed: %d", r);
265     }
266     assert(r >= 0);
267 }
268 
269 void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev,
270                                            int queue,
271                                            int idx, bool mask)
272 {
273     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
274     CryptoDevBackend *b = vcrypto->cryptodev;
275     CryptoDevBackendVhost *vhost_crypto;
276     CryptoDevBackendClient *cc;
277 
278     assert(queue < MAX_CRYPTO_QUEUE_NUM);
279 
280     cc = b->conf.peers.ccs[queue];
281     vhost_crypto = cryptodev_get_vhost(cc, b, queue);
282 
283     vhost_virtqueue_mask(&vhost_crypto->dev, dev, idx, mask);
284 }
285 
286 bool cryptodev_vhost_virtqueue_pending(VirtIODevice *dev,
287                                               int queue, int idx)
288 {
289     VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
290     CryptoDevBackend *b = vcrypto->cryptodev;
291     CryptoDevBackendVhost *vhost_crypto;
292     CryptoDevBackendClient *cc;
293 
294     assert(queue < MAX_CRYPTO_QUEUE_NUM);
295 
296     cc = b->conf.peers.ccs[queue];
297     vhost_crypto = cryptodev_get_vhost(cc, b, queue);
298 
299     return vhost_virtqueue_pending(&vhost_crypto->dev, idx);
300 }
301 
302 #else
303 uint64_t
304 cryptodev_vhost_get_max_queues(CryptoDevBackendVhost *crypto)
305 {
306     return 0;
307 }
308 
309 void cryptodev_vhost_cleanup(CryptoDevBackendVhost *crypto)
310 {
311 }
312 
313 struct CryptoDevBackendVhost *
314 cryptodev_vhost_init(CryptoDevBackendVhostOptions *options)
315 {
316     return NULL;
317 }
318 
319 CryptoDevBackendVhost *
320 cryptodev_get_vhost(CryptoDevBackendClient *cc,
321                     CryptoDevBackend *b,
322                     uint16_t queue)
323 {
324     return NULL;
325 }
326 
327 int cryptodev_vhost_start(VirtIODevice *dev, int total_queues)
328 {
329     return -1;
330 }
331 
332 void cryptodev_vhost_stop(VirtIODevice *dev, int total_queues)
333 {
334 }
335 
336 void cryptodev_vhost_virtqueue_mask(VirtIODevice *dev,
337                                     int queue,
338                                     int idx, bool mask)
339 {
340 }
341 
342 bool cryptodev_vhost_virtqueue_pending(VirtIODevice *dev,
343                                        int queue, int idx)
344 {
345     return false;
346 }
347 #endif
348