5 #include <sys/eventfd.h>
11 #include <sys/types.h>
13 #include <linux/vhost.h>
14 #include <linux/virtio.h>
15 #include <linux/virtio_ring.h>
16 #include "../../drivers/vhost/test.h"
24 /* copy used for control */
30 struct virtio_device vdev;
33 struct vq_info vqs[1];
37 struct vhost_memory *mem;
40 void vq_notify(struct virtqueue *vq)
42 struct vq_info *info = vq->priv;
43 unsigned long long v = 1;
45 r = write(info->kick, &v, sizeof v);
46 assert(r == sizeof v);
49 void vq_callback(struct virtqueue *vq)
54 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
56 struct vhost_vring_state state = { .index = info->idx };
57 struct vhost_vring_file file = { .index = info->idx };
58 unsigned long long features = dev->vdev.features[0];
59 struct vhost_vring_addr addr = {
61 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
62 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
63 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
66 r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
68 state.num = info->vring.num;
69 r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
72 r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
74 r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
77 r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
80 r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
84 static void vq_info_add(struct vdev_info *dev, int num)
86 struct vq_info *info = &dev->vqs[dev->nvqs];
88 info->idx = dev->nvqs;
89 info->kick = eventfd(0, EFD_NONBLOCK);
90 info->call = eventfd(0, EFD_NONBLOCK);
91 r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
93 memset(info->ring, 0, vring_size(num, 4096));
94 vring_init(&info->vring, num, info->ring, 4096);
95 info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev, info->ring,
96 vq_notify, vq_callback, "test");
98 info->vq->priv = info;
99 vhost_vq_setup(dev, info);
100 dev->fds[info->idx].fd = info->call;
101 dev->fds[info->idx].events = POLLIN;
105 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
108 memset(dev, 0, sizeof *dev);
109 dev->vdev.features[0] = features;
110 dev->vdev.features[1] = features >> 32;
111 dev->buf_size = 1024;
112 dev->buf = malloc(dev->buf_size);
114 dev->control = open("/dev/vhost-test", O_RDWR);
115 assert(dev->control >= 0);
116 r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
118 dev->mem = malloc(offsetof(struct vhost_memory, regions) +
119 sizeof dev->mem->regions[0]);
121 memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
122 sizeof dev->mem->regions[0]);
123 dev->mem->nregions = 1;
124 dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
125 dev->mem->regions[0].userspace_addr = (long)dev->buf;
126 dev->mem->regions[0].memory_size = dev->buf_size;
127 r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
131 /* TODO: this is pretty bad: we get a cache line bounce
132 * for the wait queue on poll and another one on read,
133 * plus the read which is there just to clear the
135 static void wait_for_interrupt(struct vdev_info *dev)
138 unsigned long long val;
139 poll(dev->fds, dev->nvqs, -1);
140 for (i = 0; i < dev->nvqs; ++i)
141 if (dev->fds[i].revents & POLLIN) {
142 read(dev->fds[i].fd, &val, sizeof val);
146 static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
148 struct scatterlist sl;
149 long started = 0, completed = 0;
150 long completed_before;
153 long long spurious = 0;
154 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
157 virtqueue_disable_cb(vq->vq);
158 completed_before = completed;
160 if (started < bufs) {
161 sg_init_one(&sl, dev->buf, dev->buf_size);
162 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
164 if (likely(r >= 0)) {
166 virtqueue_kick(vq->vq);
171 /* Flush out completed bufs if any */
172 if (virtqueue_get_buf(vq->vq, &len)) {
178 if (completed == completed_before)
180 assert(completed <= bufs);
181 assert(started <= bufs);
182 if (completed == bufs)
184 if (virtqueue_enable_cb(vq->vq)) {
185 wait_for_interrupt(dev);
189 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
191 fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
194 const char optstring[] = "h";
195 const struct option longopts[] = {
205 .name = "no-indirect",
214 fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n");
217 int main(int argc, char **argv)
219 struct vdev_info dev;
220 unsigned long long features = 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
224 o = getopt_long(argc, argv, optstring, longopts, NULL);
235 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
244 vdev_info_init(&dev, features);
245 vq_info_add(&dev, 256);
246 run_test(&dev, &dev.vqs[0], 0x100000);