1
2
3
4
5
6
7
8
9
10
11
12
13
14#include "qemu/osdep.h"
15#include "hw/virtio/virtio.h"
16#include "qemu/sockets.h"
17#include "virtio-9p.h"
18#include "fsdev/qemu-fsdev.h"
19#include "coth.h"
20#include "hw/virtio/virtio-access.h"
21#include "qemu/iov.h"
22
23static void virtio_9p_push_and_notify(V9fsPDU *pdu)
24{
25 V9fsState *s = pdu->s;
26 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
27 VirtQueueElement *elem = v->elems[pdu->idx];
28
29
30 virtqueue_push(v->vq, elem, pdu->size);
31 g_free(elem);
32 v->elems[pdu->idx] = NULL;
33
34
35 virtio_notify(VIRTIO_DEVICE(v), v->vq);
36}
37
38static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
39{
40 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
41 V9fsState *s = &v->state;
42 V9fsPDU *pdu;
43 ssize_t len;
44 VirtQueueElement *elem;
45
46 while ((pdu = pdu_alloc(s))) {
47 P9MsgHeader out;
48
49 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
50 if (!elem) {
51 goto out_free_pdu;
52 }
53
54 if (iov_size(elem->in_sg, elem->in_num) < 7) {
55 virtio_error(vdev,
56 "The guest sent a VirtFS request without space for "
57 "the reply");
58 goto out_free_req;
59 }
60
61 len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, 7);
62 if (len != 7) {
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 }
67
68 v->elems[pdu->idx] = elem;
69
70 pdu_submit(pdu, &out);
71 }
72
73 return;
74
75out_free_req:
76 virtqueue_detach_element(vq, elem, 0);
77 g_free(elem);
78out_free_pdu:
79 pdu_free(pdu);
80}
81
82static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
83 Error **errp)
84{
85 virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
86 return features;
87}
88
89static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
90{
91 int len;
92 struct virtio_9p_config *cfg;
93 V9fsVirtioState *v = VIRTIO_9P(vdev);
94 V9fsState *s = &v->state;
95
96 len = strlen(s->tag);
97 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
98 virtio_stw_p(vdev, &cfg->tag_len, len);
99
100 memcpy(cfg->tag, s->tag, len);
101 memcpy(config, cfg, v->config_size);
102 g_free(cfg);
103}
104
105static void virtio_9p_reset(VirtIODevice *vdev)
106{
107 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
108
109 v9fs_reset(&v->state);
110}
111
112static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
113 const char *fmt, va_list ap)
114{
115 V9fsState *s = pdu->s;
116 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
117 VirtQueueElement *elem = v->elems[pdu->idx];
118 ssize_t ret;
119
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;
128}
129
130static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
131 const char *fmt, va_list ap)
132{
133 V9fsState *s = pdu->s;
134 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
135 VirtQueueElement *elem = v->elems[pdu->idx];
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);
141
142 virtio_error(vdev, "Failed to decode VirtFS request type %d", pdu->id);
143 }
144 return ret;
145}
146
147static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
148 unsigned int *pniov, size_t size)
149{
150 V9fsState *s = pdu->s;
151 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
152 VirtQueueElement *elem = v->elems[pdu->idx];
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 }
162
163 *piov = elem->in_sg;
164 *pniov = elem->in_num;
165}
166
167static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
168 unsigned int *pniov, size_t size)
169{
170 V9fsState *s = pdu->s;
171 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
172 VirtQueueElement *elem = v->elems[pdu->idx];
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 }
182
183 *piov = elem->out_sg;
184 *pniov = elem->out_num;
185}
186
187static const V9fsTransport virtio_9p_transport = {
188 .pdu_vmarshal = virtio_pdu_vmarshal,
189 .pdu_vunmarshal = virtio_pdu_vunmarshal,
190 .init_in_iov_from_pdu = virtio_init_in_iov_from_pdu,
191 .init_out_iov_from_pdu = virtio_init_out_iov_from_pdu,
192 .push_and_notify = virtio_9p_push_and_notify,
193};
194
195static 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, &virtio_9p_transport, errp)) {
202 return;
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}
209
210static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
211{
212 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
213 V9fsVirtioState *v = VIRTIO_9P(dev);
214 V9fsState *s = &v->state;
215
216 virtio_cleanup(vdev);
217 v9fs_device_unrealize_common(s, errp);
218}
219
220
221
222static const VMStateDescription vmstate_virtio_9p = {
223 .name = "virtio-9p",
224 .minimum_version_id = 1,
225 .version_id = 1,
226 .fields = (VMStateField[]) {
227 VMSTATE_VIRTIO_DEVICE,
228 VMSTATE_END_OF_LIST()
229 },
230};
231
232static Property virtio_9p_properties[] = {
233 DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
234 DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
235 DEFINE_PROP_END_OF_LIST(),
236};
237
238static void virtio_9p_class_init(ObjectClass *klass, void *data)
239{
240 DeviceClass *dc = DEVICE_CLASS(klass);
241 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
242
243 dc->props = virtio_9p_properties;
244 dc->vmsd = &vmstate_virtio_9p;
245 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
246 vdc->realize = virtio_9p_device_realize;
247 vdc->unrealize = virtio_9p_device_unrealize;
248 vdc->get_features = virtio_9p_get_features;
249 vdc->get_config = virtio_9p_get_config;
250 vdc->reset = virtio_9p_reset;
251}
252
253static const TypeInfo virtio_device_info = {
254 .name = TYPE_VIRTIO_9P,
255 .parent = TYPE_VIRTIO_DEVICE,
256 .instance_size = sizeof(V9fsVirtioState),
257 .class_init = virtio_9p_class_init,
258};
259
260static void virtio_9p_register_types(void)
261{
262 type_register_static(&virtio_device_info);
263}
264
265type_init(virtio_9p_register_types)
266
