aboutsummaryrefslogtreecommitdiff
path: root/hw/virtio/vhost-backend.c
blob: 8e581575c9b3f73e8c57820c6171473a4003d59f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
/*
 * vhost-backend
 *
 * Copyright (c) 2013 Virtual Open Systems Sarl.
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include "qemu/osdep.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-backend.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "standard-headers/linux/vhost_types.h"

#include "hw/virtio/vhost-vdpa.h"
#ifdef CONFIG_VHOST_KERNEL
#include <linux/vhost.h>
#include <sys/ioctl.h>

static int vhost_kernel_call(struct vhost_dev *dev, unsigned long int request,
                             void *arg)
{
    int fd = (uintptr_t) dev->opaque;
    int ret;

    assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);

    ret = ioctl(fd, request, arg);
    return ret < 0 ? -errno : ret;
}

static int vhost_kernel_init(struct vhost_dev *dev, void *opaque, Error **errp)
{
    assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);

    dev->opaque = opaque;

    return 0;
}

static int vhost_kernel_cleanup(struct vhost_dev *dev)
{
    int fd = (uintptr_t) dev->opaque;

    assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_KERNEL);

    return close(fd) < 0 ? -errno : 0;
}

static int vhost_kernel_memslots_limit(struct vhost_dev *dev)
{
    int limit = 64;
    char *s;

    if (g_file_get_contents("/sys/module/vhost/parameters/max_mem_regions",
                            &s, NULL, NULL)) {
        uint64_t val = g_ascii_strtoull(s, NULL, 10);
        if (val < INT_MAX && val > 0) {
            g_free(s);
            return val;
        }
        error_report("ignoring invalid max_mem_regions value in vhost module:"
                     " %s", s);
    }
    g_free(s);
    return limit;
}

static int vhost_kernel_net_set_backend(struct vhost_dev *dev,
                                        struct vhost_vring_file *file)
{
    return vhost_kernel_call(dev, VHOST_NET_SET_BACKEND, file);
}

static int vhost_kernel_scsi_set_endpoint(struct vhost_dev *dev,
                                          struct vhost_scsi_target *target)
{
    return vhost_kernel_call(dev, VHOST_SCSI_SET_ENDPOINT, target);
}

static int vhost_kernel_scsi_clear_endpoint(struct vhost_dev *dev,
                                            struct vhost_scsi_target *target)
{
    return vhost_kernel_call(dev, VHOST_SCSI_CLEAR_ENDPOINT, target);
}

static int vhost_kernel_scsi_get_abi_version(struct vhost_dev *dev, int *version)
{
    return vhost_kernel_call(dev, VHOST_SCSI_GET_ABI_VERSION, version);
}

static int vhost_kernel_set_log_base(struct vhost_dev *dev, uint64_t base,
                                     struct vhost_log *log)
{
    return vhost_kernel_call(dev, VHOST_SET_LOG_BASE, &base);
}

static int vhost_kernel_set_mem_table(struct vhost_dev *dev,
                                      struct vhost_memory *mem)
{
    return vhost_kernel_call(dev, VHOST_SET_MEM_TABLE, mem);
}

static int vhost_kernel_set_vring_addr(struct vhost_dev *dev,
                                       struct vhost_vring_addr *addr)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_ADDR, addr);
}

static int vhost_kernel_set_vring_endian(struct vhost_dev *dev,
                                         struct vhost_vring_state *ring)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_ENDIAN, ring);
}

static int vhost_kernel_set_vring_num(struct vhost_dev *dev,
                                      struct vhost_vring_state *ring)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_NUM, ring);
}

static int vhost_kernel_set_vring_base(struct vhost_dev *dev,
                                       struct vhost_vring_state *ring)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_BASE, ring);
}

static int vhost_kernel_get_vring_base(struct vhost_dev *dev,
                                       struct vhost_vring_state *ring)
{
    return vhost_kernel_call(dev, VHOST_GET_VRING_BASE, ring);
}

static int vhost_kernel_set_vring_kick(struct vhost_dev *dev,
                                       struct vhost_vring_file *file)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_KICK, file);
}

static int vhost_kernel_set_vring_call(struct vhost_dev *dev,
                                       struct vhost_vring_file *file)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_CALL, file);
}

static int vhost_kernel_set_vring_err(struct vhost_dev *dev,
                                      struct vhost_vring_file *file)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_ERR, file);
}

static int vhost_kernel_set_vring_busyloop_timeout(struct vhost_dev *dev,
                                                   struct vhost_vring_state *s)
{
    return vhost_kernel_call(dev, VHOST_SET_VRING_BUSYLOOP_TIMEOUT, s);
}

static int vhost_kernel_set_features(struct vhost_dev *dev,
                                     uint64_t features)
{
    return vhost_kernel_call(dev, VHOST_SET_FEATURES, &features);
}

static int vhost_kernel_set_backend_cap(struct vhost_dev *dev)
{
    uint64_t features;
    uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2;
    int r;

    if (vhost_kernel_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) {
        return 0;
    }

    features &= f;
    r = vhost_kernel_call(dev, VHOST_SET_BACKEND_FEATURES,
                              &features);
    if (r) {
        return 0;
    }

    dev->backend_cap = features;

    return 0;
}

static int vhost_kernel_get_features(struct vhost_dev *dev,
                                     uint64_t *features)
{
    return vhost_kernel_call(dev, VHOST_GET_FEATURES, features);
}

static int vhost_kernel_set_owner(struct vhost_dev *dev)
{
    return vhost_kernel_call(dev, VHOST_SET_OWNER, NULL);
}

static int vhost_kernel_reset_device(struct vhost_dev *dev)
{
    return vhost_kernel_call(dev, VHOST_RESET_OWNER, NULL);
}

static int vhost_kernel_get_vq_index(struct vhost_dev *dev, int idx)
{
    assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);

    return idx - dev->vq_index;
}

static int vhost_kernel_vsock_set_guest_cid(struct vhost_dev *dev,
                                            uint64_t guest_cid)
{
    return vhost_kernel_call(dev, VHOST_VSOCK_SET_GUEST_CID, &guest_cid);
}

static int vhost_kernel_vsock_set_running(struct vhost_dev *dev, int start)
{
    return vhost_kernel_call(dev, VHOST_VSOCK_SET_RUNNING, &start);
}

static void vhost_kernel_iotlb_read(void *opaque)
{
    struct vhost_dev *dev = opaque;
    ssize_t len;

    if (dev->backend_cap &
        (0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)) {
        struct vhost_msg_v2 msg;

        while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) {
            if (len < sizeof msg) {
                error_report("Wrong vhost message len: %d", (int)len);
                break;
            }
            if (msg.type != VHOST_IOTLB_MSG_V2) {
                error_report("Unknown vhost iotlb message type");
                break;
            }

            vhost_backend_handle_iotlb_msg(dev, &msg.iotlb);
        }
    } else {
        struct vhost_msg msg;

        while ((len = read((uintptr_t)dev->opaque, &msg, sizeof msg)) > 0) {
            if (len < sizeof msg) {
                error_report("Wrong vhost message len: %d", (int)len);
                break;
            }
            if (msg.type != VHOST_IOTLB_MSG) {
                error_report("Unknown vhost iotlb message type");
                break;
            }

            vhost_backend_handle_iotlb_msg(dev, &msg.iotlb);
        }
    }
}

static int vhost_kernel_send_device_iotlb_msg(struct vhost_dev *dev,
                                              struct vhost_iotlb_msg *imsg)
{
    if (dev->backend_cap & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)) {
        struct vhost_msg_v2 msg = {};

        msg.type = VHOST_IOTLB_MSG_V2;
        msg.iotlb = *imsg;

        if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) {
            error_report("Fail to update device iotlb");
            return -EFAULT;
        }
    } else {
        struct vhost_msg msg = {};

        msg.type = VHOST_IOTLB_MSG;
        msg.iotlb = *imsg;

        if (write((uintptr_t)dev->opaque, &msg, sizeof msg) != sizeof msg) {
            error_report("Fail to update device iotlb");
            return -EFAULT;
        }
    }

    return 0;
}

static void vhost_kernel_set_iotlb_callback(struct vhost_dev *dev,
                                           int enabled)
{
    if (enabled)
        qemu_set_fd_handler((uintptr_t)dev->opaque,
                            vhost_kernel_iotlb_read, NULL, dev);
    else
        qemu_set_fd_handler((uintptr_t)dev->opaque, NULL, NULL, NULL);
}

const VhostOps kernel_ops = {
        .backend_type = VHOST_BACKEND_TYPE_KERNEL,
        .vhost_backend_init = vhost_kernel_init,
        .vhost_backend_cleanup = vhost_kernel_cleanup,
        .vhost_backend_memslots_limit = vhost_kernel_memslots_limit,
        .vhost_net_set_backend = vhost_kernel_net_set_backend,
        .vhost_scsi_set_endpoint = vhost_kernel_scsi_set_endpoint,
        .vhost_scsi_clear_endpoint = vhost_kernel_scsi_clear_endpoint,
        .vhost_scsi_get_abi_version = vhost_kernel_scsi_get_abi_version,
        .vhost_set_log_base = vhost_kernel_set_log_base,
        .vhost_set_mem_table = vhost_kernel_set_mem_table,
        .vhost_set_vring_addr = vhost_kernel_set_vring_addr,
        .vhost_set_vring_endian = vhost_kernel_set_vring_endian,
        .vhost_set_vring_num = vhost_kernel_set_vring_num,
        .vhost_set_vring_base = vhost_kernel_set_vring_base,
        .vhost_get_vring_base = vhost_kernel_get_vring_base,
        .vhost_set_vring_kick = vhost_kernel_set_vring_kick,
        .vhost_set_vring_call = vhost_kernel_set_vring_call,
        .vhost_set_vring_err = vhost_kernel_set_vring_err,
        .vhost_set_vring_busyloop_timeout =
                                vhost_kernel_set_vring_busyloop_timeout,
        .vhost_set_features = vhost_kernel_set_features,
        .vhost_get_features = vhost_kernel_get_features,
        .vhost_set_backend_cap = vhost_kernel_set_backend_cap,
        .vhost_set_owner = vhost_kernel_set_owner,
        .vhost_reset_device = vhost_kernel_reset_device,
        .vhost_get_vq_index = vhost_kernel_get_vq_index,
        .vhost_vsock_set_guest_cid = vhost_kernel_vsock_set_guest_cid,
        .vhost_vsock_set_running = vhost_kernel_vsock_set_running,
        .vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback,
        .vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg,
};
#endif

int vhost_backend_update_device_iotlb(struct vhost_dev *dev,
                                             uint64_t iova, uint64_t uaddr,
                                             uint64_t len,
                                             IOMMUAccessFlags perm)
{
    struct vhost_iotlb_msg imsg;

    imsg.iova =  iova;
    imsg.uaddr = uaddr;
    imsg.size = len;
    imsg.type = VHOST_IOTLB_UPDATE;

    switch (perm) {
    case IOMMU_RO:
        imsg.perm = VHOST_ACCESS_RO;
        break;
    case IOMMU_WO:
        imsg.perm = VHOST_ACCESS_WO;
        break;
    case IOMMU_RW:
        imsg.perm = VHOST_ACCESS_RW;
        break;
    default:
        return -EINVAL;
    }

    if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg)
        return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg);

    return -ENODEV;
}

int vhost_backend_invalidate_device_iotlb(struct vhost_dev *dev,
                                                 uint64_t iova, uint64_t len)
{
    struct vhost_iotlb_msg imsg;

    imsg.iova = iova;
    imsg.size = len;
    imsg.type = VHOST_IOTLB_INVALIDATE;

    if (dev->vhost_ops && dev->vhost_ops->vhost_send_device_iotlb_msg)
        return dev->vhost_ops->vhost_send_device_iotlb_msg(dev, &imsg);

    return -ENODEV;
}

int vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
                                          struct vhost_iotlb_msg *imsg)
{
    int ret = 0;

    if (unlikely(!dev->vdev)) {
        error_report("Unexpected IOTLB message when virtio device is stopped");
        return -EINVAL;
    }

    switch (imsg->type) {
    case VHOST_IOTLB_MISS:
        ret = vhost_device_iotlb_miss(dev, imsg->iova,
                                      imsg->perm != VHOST_ACCESS_RO);
        break;
    case VHOST_IOTLB_ACCESS_FAIL:
        /* FIXME: report device iotlb error */
        error_report("Access failure IOTLB message type not supported");
        ret = -ENOTSUP;
        break;
    case VHOST_IOTLB_UPDATE:
    case VHOST_IOTLB_INVALIDATE:
    default:
        error_report("Unexpected IOTLB message type");
        ret = -EINVAL;
        break;
    }

    return ret;
}