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f4f61d27 AK |
1 | /* |
2 | * Virtio 9p backend | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
9b8bfe21 | 14 | #include "qemu/osdep.h" |
0d09e41a | 15 | #include "hw/virtio/virtio.h" |
1de7afc9 | 16 | #include "qemu/sockets.h" |
f4f61d27 AK |
17 | #include "virtio-9p.h" |
18 | #include "fsdev/qemu-fsdev.h" | |
fe52840c | 19 | #include "coth.h" |
d64ccb91 | 20 | #include "hw/virtio/virtio-access.h" |
0192cc5d | 21 | #include "qemu/iov.h" |
f4f61d27 | 22 | |
ea83441c | 23 | static void virtio_9p_push_and_notify(V9fsPDU *pdu) |
0d3716b4 WL |
24 | { |
25 | V9fsState *s = pdu->s; | |
00588a0a | 26 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); |
51b19ebe | 27 | VirtQueueElement *elem = v->elems[pdu->idx]; |
0d3716b4 WL |
28 | |
29 | /* push onto queue and notify */ | |
00588a0a | 30 | virtqueue_push(v->vq, elem, pdu->size); |
51b19ebe PB |
31 | g_free(elem); |
32 | v->elems[pdu->idx] = NULL; | |
0d3716b4 WL |
33 | |
34 | /* FIXME: we should batch these completions */ | |
00588a0a | 35 | virtio_notify(VIRTIO_DEVICE(v), v->vq); |
0d3716b4 WL |
36 | } |
37 | ||
0192cc5d WL |
38 | static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
39 | { | |
00588a0a WL |
40 | V9fsVirtioState *v = (V9fsVirtioState *)vdev; |
41 | V9fsState *s = &v->state; | |
0192cc5d WL |
42 | V9fsPDU *pdu; |
43 | ssize_t len; | |
d3d74d6f | 44 | VirtQueueElement *elem; |
0192cc5d | 45 | |
00588a0a | 46 | while ((pdu = pdu_alloc(s))) { |
c9fb47e7 | 47 | P9MsgHeader out; |
0192cc5d | 48 | |
51b19ebe PB |
49 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
50 | if (!elem) { | |
d3d74d6f | 51 | goto out_free_pdu; |
00588a0a WL |
52 | } |
53 | ||
a4d99854 | 54 | if (iov_size(elem->in_sg, elem->in_num) < 7) { |
d3d74d6f GK |
55 | virtio_error(vdev, |
56 | "The guest sent a VirtFS request without space for " | |
57 | "the reply"); | |
58 | goto out_free_req; | |
59 | } | |
0192cc5d | 60 | |
a4d99854 GK |
61 | len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, 7); |
62 | if (len != 7) { | |
d3d74d6f GK |
63 | virtio_error(vdev, "The guest sent a malformed VirtFS request: " |
64 | "header size is %zd, should be 7", len); | |
65 | goto out_free_req; | |
66 | } | |
0192cc5d | 67 | |
3a21fb2a GK |
68 | v->elems[pdu->idx] = elem; |
69 | ||
506f3275 | 70 | pdu_submit(pdu, &out); |
0192cc5d | 71 | } |
d3d74d6f GK |
72 | |
73 | return; | |
74 | ||
75 | out_free_req: | |
76 | virtqueue_detach_element(vq, elem, 0); | |
77 | g_free(elem); | |
78 | out_free_pdu: | |
79 | pdu_free(pdu); | |
0192cc5d WL |
80 | } |
81 | ||
9d5b731d JW |
82 | static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features, |
83 | Error **errp) | |
f4f61d27 | 84 | { |
0cd09c3a | 85 | virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG); |
f4f61d27 AK |
86 | return features; |
87 | } | |
88 | ||
f4f61d27 AK |
89 | static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
90 | { | |
e9a0152b | 91 | int len; |
f4f61d27 | 92 | struct virtio_9p_config *cfg; |
00588a0a WL |
93 | V9fsVirtioState *v = VIRTIO_9P(vdev); |
94 | V9fsState *s = &v->state; | |
f4f61d27 | 95 | |
e9a0152b AK |
96 | len = strlen(s->tag); |
97 | cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); | |
d64ccb91 | 98 | virtio_stw_p(vdev, &cfg->tag_len, len); |
e9a0152b AK |
99 | /* We don't copy the terminating null to config space */ |
100 | memcpy(cfg->tag, s->tag, len); | |
00588a0a | 101 | memcpy(config, cfg, v->config_size); |
7267c094 | 102 | g_free(cfg); |
f4f61d27 AK |
103 | } |
104 | ||
0e44a0fd GK |
105 | static void virtio_9p_reset(VirtIODevice *vdev) |
106 | { | |
107 | V9fsVirtioState *v = (V9fsVirtioState *)vdev; | |
108 | ||
109 | v9fs_reset(&v->state); | |
110 | } | |
111 | ||
ea83441c SS |
112 | static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset, |
113 | const char *fmt, va_list ap) | |
fe9fa96d | 114 | { |
00588a0a WL |
115 | V9fsState *s = pdu->s; |
116 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
51b19ebe | 117 | VirtQueueElement *elem = v->elems[pdu->idx]; |
8d37de41 | 118 | ssize_t ret; |
00588a0a | 119 | |
8d37de41 GK |
120 | ret = v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap); |
121 | if (ret < 0) { | |
122 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
123 | ||
124 | virtio_error(vdev, "Failed to encode VirtFS reply type %d", | |
125 | pdu->id + 1); | |
126 | } | |
127 | return ret; | |
fe9fa96d WL |
128 | } |
129 | ||
ea83441c SS |
130 | static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset, |
131 | const char *fmt, va_list ap) | |
fe9fa96d | 132 | { |
00588a0a WL |
133 | V9fsState *s = pdu->s; |
134 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
51b19ebe | 135 | VirtQueueElement *elem = v->elems[pdu->idx]; |
8d37de41 GK |
136 | ssize_t ret; |
137 | ||
138 | ret = v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap); | |
139 | if (ret < 0) { | |
140 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
00588a0a | 141 | |
8d37de41 GK |
142 | virtio_error(vdev, "Failed to decode VirtFS request type %d", pdu->id); |
143 | } | |
144 | return ret; | |
fe9fa96d WL |
145 | } |
146 | ||
88da0b03 SS |
147 | static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov, |
148 | unsigned int *pniov, size_t size) | |
592707af | 149 | { |
00588a0a WL |
150 | V9fsState *s = pdu->s; |
151 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
51b19ebe | 152 | VirtQueueElement *elem = v->elems[pdu->idx]; |
8d37de41 GK |
153 | size_t buf_size = iov_size(elem->in_sg, elem->in_num); |
154 | ||
155 | if (buf_size < size) { | |
156 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
157 | ||
158 | virtio_error(vdev, | |
159 | "VirtFS reply type %d needs %zu bytes, buffer has %zu", | |
160 | pdu->id + 1, size, buf_size); | |
161 | } | |
00588a0a | 162 | |
88da0b03 SS |
163 | *piov = elem->in_sg; |
164 | *pniov = elem->in_num; | |
165 | } | |
166 | ||
167 | static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov, | |
8d37de41 | 168 | unsigned int *pniov, size_t size) |
88da0b03 SS |
169 | { |
170 | V9fsState *s = pdu->s; | |
171 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
172 | VirtQueueElement *elem = v->elems[pdu->idx]; | |
8d37de41 GK |
173 | size_t buf_size = iov_size(elem->out_sg, elem->out_num); |
174 | ||
175 | if (buf_size < size) { | |
176 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
177 | ||
178 | virtio_error(vdev, | |
179 | "VirtFS request type %d needs %zu bytes, buffer has %zu", | |
180 | pdu->id, size, buf_size); | |
181 | } | |
88da0b03 SS |
182 | |
183 | *piov = elem->out_sg; | |
184 | *pniov = elem->out_num; | |
592707af WL |
185 | } |
186 | ||
ea83441c SS |
187 | static const struct V9fsTransport virtio_9p_transport = { |
188 | .pdu_vmarshal = virtio_pdu_vmarshal, | |
189 | .pdu_vunmarshal = virtio_pdu_vunmarshal, | |
88da0b03 SS |
190 | .init_in_iov_from_pdu = virtio_init_in_iov_from_pdu, |
191 | .init_out_iov_from_pdu = virtio_init_out_iov_from_pdu, | |
ea83441c SS |
192 | .push_and_notify = virtio_9p_push_and_notify, |
193 | }; | |
194 | ||
bd3be4db GK |
195 | static void virtio_9p_device_realize(DeviceState *dev, Error **errp) |
196 | { | |
197 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
198 | V9fsVirtioState *v = VIRTIO_9P(dev); | |
199 | V9fsState *s = &v->state; | |
200 | ||
201 | if (v9fs_device_realize_common(s, errp)) { | |
202 | goto out; | |
203 | } | |
204 | ||
205 | v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag); | |
206 | virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size); | |
207 | v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output); | |
208 | v9fs_register_transport(s, &virtio_9p_transport); | |
209 | ||
210 | out: | |
211 | return; | |
212 | } | |
213 | ||
214 | static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp) | |
215 | { | |
216 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
217 | V9fsVirtioState *v = VIRTIO_9P(dev); | |
218 | V9fsState *s = &v->state; | |
219 | ||
220 | virtio_cleanup(vdev); | |
221 | v9fs_device_unrealize_common(s, errp); | |
222 | } | |
223 | ||
e7303c43 FK |
224 | /* virtio-9p device */ |
225 | ||
dcaf8dda HP |
226 | static const VMStateDescription vmstate_virtio_9p = { |
227 | .name = "virtio-9p", | |
228 | .minimum_version_id = 1, | |
229 | .version_id = 1, | |
230 | .fields = (VMStateField[]) { | |
231 | VMSTATE_VIRTIO_DEVICE, | |
232 | VMSTATE_END_OF_LIST() | |
233 | }, | |
234 | }; | |
18e0e5b2 | 235 | |
e7303c43 | 236 | static Property virtio_9p_properties[] = { |
00588a0a WL |
237 | DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag), |
238 | DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id), | |
e7303c43 FK |
239 | DEFINE_PROP_END_OF_LIST(), |
240 | }; | |
241 | ||
242 | static void virtio_9p_class_init(ObjectClass *klass, void *data) | |
243 | { | |
244 | DeviceClass *dc = DEVICE_CLASS(klass); | |
245 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
59be7522 | 246 | |
e7303c43 | 247 | dc->props = virtio_9p_properties; |
18e0e5b2 | 248 | dc->vmsd = &vmstate_virtio_9p; |
125ee0ed | 249 | set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
59be7522 | 250 | vdc->realize = virtio_9p_device_realize; |
6cecf093 | 251 | vdc->unrealize = virtio_9p_device_unrealize; |
e7303c43 FK |
252 | vdc->get_features = virtio_9p_get_features; |
253 | vdc->get_config = virtio_9p_get_config; | |
0e44a0fd | 254 | vdc->reset = virtio_9p_reset; |
e7303c43 FK |
255 | } |
256 | ||
257 | static const TypeInfo virtio_device_info = { | |
258 | .name = TYPE_VIRTIO_9P, | |
259 | .parent = TYPE_VIRTIO_DEVICE, | |
00588a0a | 260 | .instance_size = sizeof(V9fsVirtioState), |
e7303c43 FK |
261 | .class_init = virtio_9p_class_init, |
262 | }; | |
263 | ||
264 | static void virtio_9p_register_types(void) | |
265 | { | |
266 | type_register_static(&virtio_device_info); | |
267 | } | |
268 | ||
269 | type_init(virtio_9p_register_types) |