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Commit | Line | Data |
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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" |
a27bd6c7 | 20 | #include "hw/qdev-properties.h" |
d64ccb91 | 21 | #include "hw/virtio/virtio-access.h" |
0192cc5d | 22 | #include "qemu/iov.h" |
0b8fa32f | 23 | #include "qemu/module.h" |
f4f61d27 | 24 | |
ea83441c | 25 | static void virtio_9p_push_and_notify(V9fsPDU *pdu) |
0d3716b4 WL |
26 | { |
27 | V9fsState *s = pdu->s; | |
00588a0a | 28 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); |
51b19ebe | 29 | VirtQueueElement *elem = v->elems[pdu->idx]; |
0d3716b4 WL |
30 | |
31 | /* push onto queue and notify */ | |
00588a0a | 32 | virtqueue_push(v->vq, elem, pdu->size); |
51b19ebe PB |
33 | g_free(elem); |
34 | v->elems[pdu->idx] = NULL; | |
0d3716b4 WL |
35 | |
36 | /* FIXME: we should batch these completions */ | |
00588a0a | 37 | virtio_notify(VIRTIO_DEVICE(v), v->vq); |
0d3716b4 WL |
38 | } |
39 | ||
0192cc5d WL |
40 | static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
41 | { | |
00588a0a WL |
42 | V9fsVirtioState *v = (V9fsVirtioState *)vdev; |
43 | V9fsState *s = &v->state; | |
0192cc5d WL |
44 | V9fsPDU *pdu; |
45 | ssize_t len; | |
d3d74d6f | 46 | VirtQueueElement *elem; |
0192cc5d | 47 | |
00588a0a | 48 | while ((pdu = pdu_alloc(s))) { |
c9fb47e7 | 49 | P9MsgHeader out; |
0192cc5d | 50 | |
51b19ebe PB |
51 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
52 | if (!elem) { | |
d3d74d6f | 53 | goto out_free_pdu; |
00588a0a WL |
54 | } |
55 | ||
a4d99854 | 56 | if (iov_size(elem->in_sg, elem->in_num) < 7) { |
d3d74d6f GK |
57 | virtio_error(vdev, |
58 | "The guest sent a VirtFS request without space for " | |
59 | "the reply"); | |
60 | goto out_free_req; | |
61 | } | |
0192cc5d | 62 | |
a4d99854 GK |
63 | len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, 7); |
64 | if (len != 7) { | |
d3d74d6f GK |
65 | virtio_error(vdev, "The guest sent a malformed VirtFS request: " |
66 | "header size is %zd, should be 7", len); | |
67 | goto out_free_req; | |
68 | } | |
0192cc5d | 69 | |
3a21fb2a GK |
70 | v->elems[pdu->idx] = elem; |
71 | ||
506f3275 | 72 | pdu_submit(pdu, &out); |
0192cc5d | 73 | } |
d3d74d6f GK |
74 | |
75 | return; | |
76 | ||
77 | out_free_req: | |
78 | virtqueue_detach_element(vq, elem, 0); | |
79 | g_free(elem); | |
80 | out_free_pdu: | |
81 | pdu_free(pdu); | |
0192cc5d WL |
82 | } |
83 | ||
9d5b731d JW |
84 | static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features, |
85 | Error **errp) | |
f4f61d27 | 86 | { |
0cd09c3a | 87 | virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG); |
f4f61d27 AK |
88 | return features; |
89 | } | |
90 | ||
f4f61d27 AK |
91 | static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
92 | { | |
e9a0152b | 93 | int len; |
f4f61d27 | 94 | struct virtio_9p_config *cfg; |
00588a0a WL |
95 | V9fsVirtioState *v = VIRTIO_9P(vdev); |
96 | V9fsState *s = &v->state; | |
f4f61d27 | 97 | |
e9a0152b AK |
98 | len = strlen(s->tag); |
99 | cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); | |
d64ccb91 | 100 | virtio_stw_p(vdev, &cfg->tag_len, len); |
e9a0152b AK |
101 | /* We don't copy the terminating null to config space */ |
102 | memcpy(cfg->tag, s->tag, len); | |
00588a0a | 103 | memcpy(config, cfg, v->config_size); |
7267c094 | 104 | g_free(cfg); |
f4f61d27 AK |
105 | } |
106 | ||
0e44a0fd GK |
107 | static void virtio_9p_reset(VirtIODevice *vdev) |
108 | { | |
109 | V9fsVirtioState *v = (V9fsVirtioState *)vdev; | |
110 | ||
111 | v9fs_reset(&v->state); | |
112 | } | |
113 | ||
ea83441c SS |
114 | static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset, |
115 | const char *fmt, va_list ap) | |
fe9fa96d | 116 | { |
00588a0a WL |
117 | V9fsState *s = pdu->s; |
118 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
51b19ebe | 119 | VirtQueueElement *elem = v->elems[pdu->idx]; |
8d37de41 | 120 | ssize_t ret; |
00588a0a | 121 | |
8d37de41 GK |
122 | ret = v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap); |
123 | if (ret < 0) { | |
124 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
125 | ||
126 | virtio_error(vdev, "Failed to encode VirtFS reply type %d", | |
127 | pdu->id + 1); | |
128 | } | |
129 | return ret; | |
fe9fa96d WL |
130 | } |
131 | ||
ea83441c SS |
132 | static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset, |
133 | const char *fmt, va_list ap) | |
fe9fa96d | 134 | { |
00588a0a WL |
135 | V9fsState *s = pdu->s; |
136 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
51b19ebe | 137 | VirtQueueElement *elem = v->elems[pdu->idx]; |
8d37de41 GK |
138 | ssize_t ret; |
139 | ||
140 | ret = v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap); | |
141 | if (ret < 0) { | |
142 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
00588a0a | 143 | |
8d37de41 GK |
144 | virtio_error(vdev, "Failed to decode VirtFS request type %d", pdu->id); |
145 | } | |
146 | return ret; | |
fe9fa96d WL |
147 | } |
148 | ||
88da0b03 | 149 | static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov, |
16724a17 | 150 | unsigned int *pniov, size_t *size) |
592707af | 151 | { |
00588a0a WL |
152 | V9fsState *s = pdu->s; |
153 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
51b19ebe | 154 | VirtQueueElement *elem = v->elems[pdu->idx]; |
8d37de41 GK |
155 | size_t buf_size = iov_size(elem->in_sg, elem->in_num); |
156 | ||
16724a17 | 157 | if (buf_size < P9_IOHDRSZ) { |
8d37de41 GK |
158 | VirtIODevice *vdev = VIRTIO_DEVICE(v); |
159 | ||
160 | virtio_error(vdev, | |
16724a17 GK |
161 | "VirtFS reply type %d needs %zu bytes, buffer has %zu, less than minimum", |
162 | pdu->id + 1, *size, buf_size); | |
163 | } | |
164 | if (buf_size < *size) { | |
165 | *size = buf_size; | |
8d37de41 | 166 | } |
00588a0a | 167 | |
88da0b03 SS |
168 | *piov = elem->in_sg; |
169 | *pniov = elem->in_num; | |
170 | } | |
171 | ||
172 | static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov, | |
8d37de41 | 173 | unsigned int *pniov, size_t size) |
88da0b03 SS |
174 | { |
175 | V9fsState *s = pdu->s; | |
176 | V9fsVirtioState *v = container_of(s, V9fsVirtioState, state); | |
177 | VirtQueueElement *elem = v->elems[pdu->idx]; | |
8d37de41 GK |
178 | size_t buf_size = iov_size(elem->out_sg, elem->out_num); |
179 | ||
180 | if (buf_size < size) { | |
181 | VirtIODevice *vdev = VIRTIO_DEVICE(v); | |
182 | ||
183 | virtio_error(vdev, | |
184 | "VirtFS request type %d needs %zu bytes, buffer has %zu", | |
185 | pdu->id, size, buf_size); | |
186 | } | |
88da0b03 SS |
187 | |
188 | *piov = elem->out_sg; | |
189 | *pniov = elem->out_num; | |
592707af WL |
190 | } |
191 | ||
8e71b96c | 192 | static const V9fsTransport virtio_9p_transport = { |
ea83441c SS |
193 | .pdu_vmarshal = virtio_pdu_vmarshal, |
194 | .pdu_vunmarshal = virtio_pdu_vunmarshal, | |
88da0b03 SS |
195 | .init_in_iov_from_pdu = virtio_init_in_iov_from_pdu, |
196 | .init_out_iov_from_pdu = virtio_init_out_iov_from_pdu, | |
ea83441c SS |
197 | .push_and_notify = virtio_9p_push_and_notify, |
198 | }; | |
199 | ||
bd3be4db GK |
200 | static void virtio_9p_device_realize(DeviceState *dev, Error **errp) |
201 | { | |
202 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
203 | V9fsVirtioState *v = VIRTIO_9P(dev); | |
204 | V9fsState *s = &v->state; | |
205 | ||
066eb006 GK |
206 | if (v9fs_device_realize_common(s, &virtio_9p_transport, errp)) { |
207 | return; | |
bd3be4db GK |
208 | } |
209 | ||
210 | v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag); | |
211 | virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size); | |
212 | v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output); | |
bd3be4db GK |
213 | } |
214 | ||
b69c3c21 | 215 | static void virtio_9p_device_unrealize(DeviceState *dev) |
bd3be4db GK |
216 | { |
217 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
218 | V9fsVirtioState *v = VIRTIO_9P(dev); | |
219 | V9fsState *s = &v->state; | |
220 | ||
ad30a9e9 | 221 | virtio_delete_queue(v->vq); |
bd3be4db | 222 | virtio_cleanup(vdev); |
b69c3c21 | 223 | v9fs_device_unrealize_common(s); |
bd3be4db GK |
224 | } |
225 | ||
e7303c43 FK |
226 | /* virtio-9p device */ |
227 | ||
dcaf8dda HP |
228 | static const VMStateDescription vmstate_virtio_9p = { |
229 | .name = "virtio-9p", | |
230 | .minimum_version_id = 1, | |
231 | .version_id = 1, | |
232 | .fields = (VMStateField[]) { | |
233 | VMSTATE_VIRTIO_DEVICE, | |
234 | VMSTATE_END_OF_LIST() | |
235 | }, | |
236 | }; | |
18e0e5b2 | 237 | |
e7303c43 | 238 | static Property virtio_9p_properties[] = { |
00588a0a WL |
239 | DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag), |
240 | DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id), | |
e7303c43 FK |
241 | DEFINE_PROP_END_OF_LIST(), |
242 | }; | |
243 | ||
244 | static void virtio_9p_class_init(ObjectClass *klass, void *data) | |
245 | { | |
246 | DeviceClass *dc = DEVICE_CLASS(klass); | |
247 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
59be7522 | 248 | |
4f67d30b | 249 | device_class_set_props(dc, virtio_9p_properties); |
18e0e5b2 | 250 | dc->vmsd = &vmstate_virtio_9p; |
125ee0ed | 251 | set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
59be7522 | 252 | vdc->realize = virtio_9p_device_realize; |
6cecf093 | 253 | vdc->unrealize = virtio_9p_device_unrealize; |
e7303c43 FK |
254 | vdc->get_features = virtio_9p_get_features; |
255 | vdc->get_config = virtio_9p_get_config; | |
0e44a0fd | 256 | vdc->reset = virtio_9p_reset; |
e7303c43 FK |
257 | } |
258 | ||
259 | static const TypeInfo virtio_device_info = { | |
260 | .name = TYPE_VIRTIO_9P, | |
261 | .parent = TYPE_VIRTIO_DEVICE, | |
00588a0a | 262 | .instance_size = sizeof(V9fsVirtioState), |
e7303c43 FK |
263 | .class_init = virtio_9p_class_init, |
264 | }; | |
265 | ||
266 | static void virtio_9p_register_types(void) | |
267 | { | |
268 | type_register_static(&virtio_device_info); | |
269 | } | |
270 | ||
271 | type_init(virtio_9p_register_types) |