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17#include <sys/ioctl.h>
18#include "config.h"
19#include "qemu/queue.h"
20#include "monitor/monitor.h"
21#include "migration/migration.h"
22#include "hw/virtio/vhost-scsi.h"
23#include "hw/virtio/vhost.h"
24#include "hw/virtio/virtio-scsi.h"
25#include "hw/virtio/virtio-bus.h"
26
27static int vhost_scsi_set_endpoint(VHostSCSI *s)
28{
29 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
30 struct vhost_scsi_target backend;
31 int ret;
32
33 memset(&backend, 0, sizeof(backend));
34 pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
35 ret = ioctl(s->dev.control, VHOST_SCSI_SET_ENDPOINT, &backend);
36 if (ret < 0) {
37 return -errno;
38 }
39 return 0;
40}
41
42static void vhost_scsi_clear_endpoint(VHostSCSI *s)
43{
44 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
45 struct vhost_scsi_target backend;
46
47 memset(&backend, 0, sizeof(backend));
48 pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
49 ioctl(s->dev.control, VHOST_SCSI_CLEAR_ENDPOINT, &backend);
50}
51
52static int vhost_scsi_start(VHostSCSI *s)
53{
54 int ret, abi_version, i;
55 VirtIODevice *vdev = VIRTIO_DEVICE(s);
56 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
57 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
58
59 if (!k->set_guest_notifiers) {
60 error_report("binding does not support guest notifiers");
61 return -ENOSYS;
62 }
63
64 ret = ioctl(s->dev.control, VHOST_SCSI_GET_ABI_VERSION, &abi_version);
65 if (ret < 0) {
66 return -errno;
67 }
68 if (abi_version > VHOST_SCSI_ABI_VERSION) {
69 error_report("vhost-scsi: The running tcm_vhost kernel abi_version:"
70 " %d is greater than vhost_scsi userspace supports: %d, please"
71 " upgrade your version of QEMU\n", abi_version,
72 VHOST_SCSI_ABI_VERSION);
73 return -ENOSYS;
74 }
75
76 ret = vhost_dev_enable_notifiers(&s->dev, vdev);
77 if (ret < 0) {
78 return ret;
79 }
80
81 s->dev.acked_features = vdev->guest_features;
82 ret = vhost_dev_start(&s->dev, vdev);
83 if (ret < 0) {
84 error_report("Error start vhost dev");
85 goto err_notifiers;
86 }
87
88 ret = vhost_scsi_set_endpoint(s);
89 if (ret < 0) {
90 error_report("Error set vhost-scsi endpoint");
91 goto err_vhost_stop;
92 }
93
94 ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
95 if (ret < 0) {
96 error_report("Error binding guest notifier");
97 goto err_endpoint;
98 }
99
100
101
102
103
104 for (i = 0; i < s->dev.nvqs; i++) {
105 vhost_virtqueue_mask(&s->dev, vdev, i, false);
106 }
107
108 return ret;
109
110err_endpoint:
111 vhost_scsi_clear_endpoint(s);
112err_vhost_stop:
113 vhost_dev_stop(&s->dev, vdev);
114err_notifiers:
115 vhost_dev_disable_notifiers(&s->dev, vdev);
116 return ret;
117}
118
119static void vhost_scsi_stop(VHostSCSI *s)
120{
121 VirtIODevice *vdev = VIRTIO_DEVICE(s);
122 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
123 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
124 int ret = 0;
125
126 if (!k->set_guest_notifiers) {
127 ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
128 if (ret < 0) {
129 error_report("vhost guest notifier cleanup failed: %d\n", ret);
130 }
131 }
132 assert(ret >= 0);
133
134 vhost_scsi_clear_endpoint(s);
135 vhost_dev_stop(&s->dev, vdev);
136 vhost_dev_disable_notifiers(&s->dev, vdev);
137}
138
139static uint32_t vhost_scsi_get_features(VirtIODevice *vdev,
140 uint32_t features)
141{
142 VHostSCSI *s = VHOST_SCSI(vdev);
143
144
145 if (!(s->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
146 features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
147 }
148 if (!(s->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
149 features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
150 }
151 if (!(s->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
152 features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
153 }
154 if (!(s->dev.features & (1 << VIRTIO_SCSI_F_HOTPLUG))) {
155 features &= ~(1 << VIRTIO_SCSI_F_HOTPLUG);
156 }
157
158 return features;
159}
160
161static void vhost_scsi_set_config(VirtIODevice *vdev,
162 const uint8_t *config)
163{
164 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
165 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
166
167 if ((uint32_t) ldl_raw(&scsiconf->sense_size) != vs->sense_size ||
168 (uint32_t) ldl_raw(&scsiconf->cdb_size) != vs->cdb_size) {
169 error_report("vhost-scsi does not support changing the sense data and CDB sizes");
170 exit(1);
171 }
172}
173
174static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
175{
176 VHostSCSI *s = (VHostSCSI *)vdev;
177 bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK);
178
179 if (s->dev.started == start) {
180 return;
181 }
182
183 if (start) {
184 int ret;
185
186 ret = vhost_scsi_start(s);
187 if (ret < 0) {
188 error_report("virtio-scsi: unable to start vhost: %s\n",
189 strerror(-ret));
190
191
192 exit(1);
193 }
194 } else {
195 vhost_scsi_stop(s);
196 }
197}
198
199static int vhost_scsi_init(VirtIODevice *vdev)
200{
201 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
202 VHostSCSI *s = VHOST_SCSI(vdev);
203 int vhostfd = -1;
204 int ret;
205
206 if (!vs->conf.wwpn) {
207 error_report("vhost-scsi: missing wwpn\n");
208 return -EINVAL;
209 }
210
211 if (vs->conf.vhostfd) {
212 vhostfd = monitor_handle_fd_param(cur_mon, vs->conf.vhostfd);
213 if (vhostfd == -1) {
214 error_report("vhost-scsi: unable to parse vhostfd\n");
215 return -EINVAL;
216 }
217 }
218
219 ret = virtio_scsi_common_init(vs);
220 if (ret < 0) {
221 return ret;
222 }
223
224 s->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
225 s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs);
226 s->dev.vq_index = 0;
227
228 ret = vhost_dev_init(&s->dev, vhostfd, "/dev/vhost-scsi", true);
229 if (ret < 0) {
230 error_report("vhost-scsi: vhost initialization failed: %s\n",
231 strerror(-ret));
232 return ret;
233 }
234 s->dev.backend_features = 0;
235
236 error_setg(&s->migration_blocker,
237 "vhost-scsi does not support migration");
238 migrate_add_blocker(s->migration_blocker);
239
240 return 0;
241}
242
243static int vhost_scsi_exit(DeviceState *qdev)
244{
245 VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
246 VHostSCSI *s = VHOST_SCSI(qdev);
247 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(qdev);
248
249 migrate_del_blocker(s->migration_blocker);
250 error_free(s->migration_blocker);
251
252
253 vhost_scsi_set_status(vdev, 0);
254
255 g_free(s->dev.vqs);
256 return virtio_scsi_common_exit(vs);
257}
258
259static Property vhost_scsi_properties[] = {
260 DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSI, parent_obj.conf),
261 DEFINE_PROP_END_OF_LIST(),
262};
263
264static void vhost_scsi_class_init(ObjectClass *klass, void *data)
265{
266 DeviceClass *dc = DEVICE_CLASS(klass);
267 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
268 dc->exit = vhost_scsi_exit;
269 dc->props = vhost_scsi_properties;
270 vdc->init = vhost_scsi_init;
271 vdc->get_features = vhost_scsi_get_features;
272 vdc->set_config = vhost_scsi_set_config;
273 vdc->set_status = vhost_scsi_set_status;
274}
275
276static const TypeInfo vhost_scsi_info = {
277 .name = TYPE_VHOST_SCSI,
278 .parent = TYPE_VIRTIO_SCSI_COMMON,
279 .instance_size = sizeof(VHostSCSI),
280 .class_init = vhost_scsi_class_init,
281};
282
283static void virtio_register_types(void)
284{
285 type_register_static(&vhost_scsi_info);
286}
287
288type_init(virtio_register_types)
289
