blob: 42c955a5b2111bba5cc3a2125273c529a14d07eb [file] [log] [blame]
Thomas Gleixner7a338472019-06-04 10:11:15 +02001// SPDX-License-Identifier: GPL-2.0-only
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +02002/* Copyright (C) 2009 Red Hat, Inc.
3 * Author: Michael S. Tsirkin <mst@redhat.com>
4 *
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +02005 * test virtio server in host kernel.
6 */
7
8#include <linux/compat.h>
9#include <linux/eventfd.h>
10#include <linux/vhost.h>
11#include <linux/miscdevice.h>
12#include <linux/module.h>
13#include <linux/mutex.h>
14#include <linux/workqueue.h>
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020015#include <linux/file.h>
16#include <linux/slab.h>
17
18#include "test.h"
Asias He6ac1afb2013-05-06 16:38:21 +080019#include "vhost.h"
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020020
21/* Max number of bytes transferred before requeueing the job.
22 * Using this limit prevents one virtqueue from starving others. */
23#define VHOST_TEST_WEIGHT 0x80000
24
Tiwei Bie264b5632019-08-28 13:37:00 +080025/* Max number of packets transferred before requeueing the job.
26 * Using this limit prevents one virtqueue from starving others with
27 * pkts.
28 */
29#define VHOST_TEST_PKT_WEIGHT 256
30
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020031enum {
32 VHOST_TEST_VQ = 0,
33 VHOST_TEST_VQ_MAX = 1,
34};
35
36struct vhost_test {
37 struct vhost_dev dev;
38 struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX];
39};
40
41/* Expects to be always run from workqueue - which acts as
42 * read-size critical section for our kind of RCU. */
43static void handle_vq(struct vhost_test *n)
44{
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +030045 struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ];
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020046 unsigned out, in;
47 int head;
48 size_t len, total_len = 0;
49 void *private;
50
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020051 mutex_lock(&vq->mutex);
Eugenio Pérez247643f2020-03-31 21:27:57 +020052 private = vhost_vq_get_backend(vq);
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +030053 if (!private) {
54 mutex_unlock(&vq->mutex);
55 return;
56 }
57
Michael S. Tsirkin8ea8cf82011-05-20 02:10:54 +030058 vhost_disable_notify(&n->dev, vq);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020059
60 for (;;) {
Michael S. Tsirkin47283be2014-06-05 15:20:27 +030061 head = vhost_get_vq_desc(vq, vq->iov,
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020062 ARRAY_SIZE(vq->iov),
63 &out, &in,
64 NULL, NULL);
65 /* On error, stop handling until the next kick. */
66 if (unlikely(head < 0))
67 break;
68 /* Nothing new? Wait for eventfd to tell us they refilled. */
69 if (head == vq->num) {
Michael S. Tsirkin8ea8cf82011-05-20 02:10:54 +030070 if (unlikely(vhost_enable_notify(&n->dev, vq))) {
71 vhost_disable_notify(&n->dev, vq);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020072 continue;
73 }
74 break;
75 }
76 if (in) {
77 vq_err(vq, "Unexpected descriptor format for TX: "
78 "out %d, int %d\n", out, in);
79 break;
80 }
81 len = iov_length(vq->iov, out);
82 /* Sanity check */
83 if (!len) {
84 vq_err(vq, "Unexpected 0 len for TX\n");
85 break;
86 }
87 vhost_add_used_and_signal(&n->dev, vq, head, 0);
88 total_len += len;
Tiwei Bie264b5632019-08-28 13:37:00 +080089 if (unlikely(vhost_exceeds_weight(vq, 0, total_len)))
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020090 break;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020091 }
92
93 mutex_unlock(&vq->mutex);
94}
95
96static void handle_vq_kick(struct vhost_work *work)
97{
98 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
99 poll.work);
100 struct vhost_test *n = container_of(vq->dev, struct vhost_test, dev);
101
102 handle_vq(n);
103}
104
105static int vhost_test_open(struct inode *inode, struct file *f)
106{
107 struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL);
108 struct vhost_dev *dev;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300109 struct vhost_virtqueue **vqs;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200110
111 if (!n)
112 return -ENOMEM;
Kees Cook6da2ec52018-06-12 13:55:00 -0700113 vqs = kmalloc_array(VHOST_TEST_VQ_MAX, sizeof(*vqs), GFP_KERNEL);
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300114 if (!vqs) {
115 kfree(n);
116 return -ENOMEM;
117 }
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200118
119 dev = &n->dev;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300120 vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200121 n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
Tiwei Bie264b5632019-08-28 13:37:00 +0800122 vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV,
Michael S. Tsirkin044e4b02020-06-08 08:42:09 -0400123 VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT, true, NULL);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200124
125 f->private_data = n;
126
127 return 0;
128}
129
130static void *vhost_test_stop_vq(struct vhost_test *n,
131 struct vhost_virtqueue *vq)
132{
133 void *private;
134
135 mutex_lock(&vq->mutex);
Eugenio Pérez247643f2020-03-31 21:27:57 +0200136 private = vhost_vq_get_backend(vq);
137 vhost_vq_set_backend(vq, NULL);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200138 mutex_unlock(&vq->mutex);
139 return private;
140}
141
142static void vhost_test_stop(struct vhost_test *n, void **privatep)
143{
144 *privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
145}
146
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200147static void vhost_test_flush(struct vhost_test *n)
148{
Mike Christieb2ffa4072022-05-17 13:08:50 -0500149 vhost_dev_flush(&n->dev);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200150}
151
152static int vhost_test_release(struct inode *inode, struct file *f)
153{
154 struct vhost_test *n = f->private_data;
155 void *private;
156
157 vhost_test_stop(n, &private);
158 vhost_test_flush(n);
Michael S. Tsirkin245cdd92019-10-07 13:56:59 -0400159 vhost_dev_stop(&n->dev);
夷则(Caspar)f6f93f72017-12-25 00:08:58 +0800160 vhost_dev_cleanup(&n->dev);
Xianting Tian08006392021-12-28 11:09:24 +0800161 kfree(n->dev.vqs);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200162 kfree(n);
163 return 0;
164}
165
166static long vhost_test_run(struct vhost_test *n, int test)
167{
168 void *priv, *oldpriv;
169 struct vhost_virtqueue *vq;
170 int r, index;
171
172 if (test < 0 || test > 1)
173 return -EINVAL;
174
175 mutex_lock(&n->dev.mutex);
176 r = vhost_dev_check_owner(&n->dev);
177 if (r)
178 goto err;
179
180 for (index = 0; index < n->dev.nvqs; ++index) {
181 /* Verify that ring has been setup correctly. */
182 if (!vhost_vq_access_ok(&n->vqs[index])) {
183 r = -EFAULT;
184 goto err;
185 }
186 }
187
188 for (index = 0; index < n->dev.nvqs; ++index) {
189 vq = n->vqs + index;
190 mutex_lock(&vq->mutex);
191 priv = test ? n : NULL;
192
193 /* start polling new socket */
Eugenio Pérez247643f2020-03-31 21:27:57 +0200194 oldpriv = vhost_vq_get_backend(vq);
195 vhost_vq_set_backend(vq, priv);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200196
Greg Kurz80f7d032016-02-16 15:59:44 +0100197 r = vhost_vq_init_access(&n->vqs[index]);
Jason Wangf59281d2011-06-21 18:04:27 +0800198
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200199 mutex_unlock(&vq->mutex);
200
Jason Wangf59281d2011-06-21 18:04:27 +0800201 if (r)
202 goto err;
203
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200204 if (oldpriv) {
Andrey Ryabininc5514752022-05-17 13:08:46 -0500205 vhost_test_flush(n);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200206 }
207 }
208
209 mutex_unlock(&n->dev.mutex);
210 return 0;
211
212err:
213 mutex_unlock(&n->dev.mutex);
214 return r;
215}
216
217static long vhost_test_reset_owner(struct vhost_test *n)
218{
219 void *priv = NULL;
220 long err;
Michael S. Tsirkin33023632020-04-01 12:46:22 -0400221 struct vhost_iotlb *umem;
Michael S. Tsirkin150b9e52013-04-28 17:12:08 +0300222
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200223 mutex_lock(&n->dev.mutex);
224 err = vhost_dev_check_owner(&n->dev);
225 if (err)
226 goto done;
Michael S. Tsirkin446374d2016-08-15 04:28:12 +0300227 umem = vhost_dev_reset_owner_prepare();
228 if (!umem) {
Michael S. Tsirkin150b9e52013-04-28 17:12:08 +0300229 err = -ENOMEM;
230 goto done;
231 }
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200232 vhost_test_stop(n, &priv);
233 vhost_test_flush(n);
Michael S. Tsirkin245cdd92019-10-07 13:56:59 -0400234 vhost_dev_stop(&n->dev);
Michael S. Tsirkin446374d2016-08-15 04:28:12 +0300235 vhost_dev_reset_owner(&n->dev, umem);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200236done:
237 mutex_unlock(&n->dev.mutex);
238 return err;
239}
240
241static int vhost_test_set_features(struct vhost_test *n, u64 features)
242{
Michael S. Tsirkinea16c512014-06-05 15:20:23 +0300243 struct vhost_virtqueue *vq;
244
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200245 mutex_lock(&n->dev.mutex);
246 if ((features & (1 << VHOST_F_LOG_ALL)) &&
247 !vhost_log_access_ok(&n->dev)) {
248 mutex_unlock(&n->dev.mutex);
249 return -EFAULT;
250 }
Michael S. Tsirkinea16c512014-06-05 15:20:23 +0300251 vq = &n->vqs[VHOST_TEST_VQ];
252 mutex_lock(&vq->mutex);
253 vq->acked_features = features;
254 mutex_unlock(&vq->mutex);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200255 mutex_unlock(&n->dev.mutex);
256 return 0;
257}
258
Eugenio Pérez264ee5a2020-04-18 12:22:13 +0200259static long vhost_test_set_backend(struct vhost_test *n, unsigned index, int fd)
260{
261 static void *backend;
262
263 const bool enable = fd != -1;
264 struct vhost_virtqueue *vq;
265 int r;
266
267 mutex_lock(&n->dev.mutex);
268 r = vhost_dev_check_owner(&n->dev);
269 if (r)
270 goto err;
271
272 if (index >= VHOST_TEST_VQ_MAX) {
273 r = -ENOBUFS;
274 goto err;
275 }
276 vq = &n->vqs[index];
277 mutex_lock(&vq->mutex);
278
279 /* Verify that ring has been setup correctly. */
280 if (!vhost_vq_access_ok(vq)) {
281 r = -EFAULT;
282 goto err_vq;
283 }
284 if (!enable) {
285 vhost_poll_stop(&vq->poll);
286 backend = vhost_vq_get_backend(vq);
287 vhost_vq_set_backend(vq, NULL);
288 } else {
289 vhost_vq_set_backend(vq, backend);
290 r = vhost_vq_init_access(vq);
291 if (r == 0)
292 r = vhost_poll_start(&vq->poll, vq->kick);
293 }
294
295 mutex_unlock(&vq->mutex);
296
297 if (enable) {
Andrey Ryabininc5514752022-05-17 13:08:46 -0500298 vhost_test_flush(n);
Eugenio Pérez264ee5a2020-04-18 12:22:13 +0200299 }
300
301 mutex_unlock(&n->dev.mutex);
302 return 0;
303
304err_vq:
305 mutex_unlock(&vq->mutex);
306err:
307 mutex_unlock(&n->dev.mutex);
308 return r;
309}
310
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200311static long vhost_test_ioctl(struct file *f, unsigned int ioctl,
312 unsigned long arg)
313{
Eugenio Pérez264ee5a2020-04-18 12:22:13 +0200314 struct vhost_vring_file backend;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200315 struct vhost_test *n = f->private_data;
316 void __user *argp = (void __user *)arg;
317 u64 __user *featurep = argp;
318 int test;
319 u64 features;
320 int r;
321 switch (ioctl) {
322 case VHOST_TEST_RUN:
323 if (copy_from_user(&test, argp, sizeof test))
324 return -EFAULT;
325 return vhost_test_run(n, test);
Eugenio Pérez264ee5a2020-04-18 12:22:13 +0200326 case VHOST_TEST_SET_BACKEND:
327 if (copy_from_user(&backend, argp, sizeof backend))
328 return -EFAULT;
329 return vhost_test_set_backend(n, backend.index, backend.fd);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200330 case VHOST_GET_FEATURES:
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300331 features = VHOST_FEATURES;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200332 if (copy_to_user(featurep, &features, sizeof features))
333 return -EFAULT;
334 return 0;
335 case VHOST_SET_FEATURES:
336 if (copy_from_user(&features, featurep, sizeof features))
337 return -EFAULT;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300338 if (features & ~VHOST_FEATURES)
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200339 return -EOPNOTSUPP;
340 return vhost_test_set_features(n, features);
341 case VHOST_RESET_OWNER:
342 return vhost_test_reset_owner(n);
343 default:
344 mutex_lock(&n->dev.mutex);
Michael S. Tsirkin73640c92013-03-18 13:22:18 +1030345 r = vhost_dev_ioctl(&n->dev, ioctl, argp);
346 if (r == -ENOIOCTLCMD)
347 r = vhost_vring_ioctl(&n->dev, ioctl, argp);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200348 vhost_test_flush(n);
349 mutex_unlock(&n->dev.mutex);
350 return r;
351 }
352}
353
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200354static const struct file_operations vhost_test_fops = {
355 .owner = THIS_MODULE,
356 .release = vhost_test_release,
357 .unlocked_ioctl = vhost_test_ioctl,
Arnd Bergmann407e9ef2018-09-11 17:23:00 +0200358 .compat_ioctl = compat_ptr_ioctl,
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200359 .open = vhost_test_open,
360 .llseek = noop_llseek,
361};
362
363static struct miscdevice vhost_test_misc = {
364 MISC_DYNAMIC_MINOR,
365 "vhost-test",
366 &vhost_test_fops,
367};
PrasannaKumar Muralidharanca75d602016-08-25 22:30:49 +0530368module_misc_device(vhost_test_misc);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200369
370MODULE_VERSION("0.0.1");
371MODULE_LICENSE("GPL v2");
372MODULE_AUTHOR("Michael S. Tsirkin");
373MODULE_DESCRIPTION("Host kernel side for virtio simulator");