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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
23void 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 struct {
48 uint32_t size_le;
49 uint8_t id;
50 uint16_t tag_le;
51 } QEMU_PACKED out;
52
53 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
54 if (!elem) {
55 goto out_free_pdu;
56 }
57
58 if (elem->in_num == 0) {
59 virtio_error(vdev,
60 "The guest sent a VirtFS request without space for "
61 "the reply");
62 goto out_free_req;
63 }
64 QEMU_BUILD_BUG_ON(sizeof(out) != 7);
65
66 v->elems[pdu->idx] = elem;
67 len = iov_to_buf(elem->out_sg, elem->out_num, 0,
68 &out, sizeof(out));
69 if (len != sizeof(out)) {
70 virtio_error(vdev, "The guest sent a malformed VirtFS request: "
71 "header size is %zd, should be 7", len);
72 goto out_free_req;
73 }
74
75 pdu->size = le32_to_cpu(out.size_le);
76
77 pdu->id = out.id;
78 pdu->tag = le16_to_cpu(out.tag_le);
79
80 qemu_co_queue_init(&pdu->complete);
81 pdu_submit(pdu);
82 }
83
84 return;
85
86out_free_req:
87 virtqueue_detach_element(vq, elem, 0);
88 g_free(elem);
89out_free_pdu:
90 pdu_free(pdu);
91}
92
93static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
94 Error **errp)
95{
96 virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
97 return features;
98}
99
100static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
101{
102 int len;
103 struct virtio_9p_config *cfg;
104 V9fsVirtioState *v = VIRTIO_9P(vdev);
105 V9fsState *s = &v->state;
106
107 len = strlen(s->tag);
108 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
109 virtio_stw_p(vdev, &cfg->tag_len, len);
110
111 memcpy(cfg->tag, s->tag, len);
112 memcpy(config, cfg, v->config_size);
113 g_free(cfg);
114}
115
116static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
117{
118 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
119 V9fsVirtioState *v = VIRTIO_9P(dev);
120 V9fsState *s = &v->state;
121
122 if (v9fs_device_realize_common(s, errp)) {
123 goto out;
124 }
125
126 v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag);
127 virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size);
128 v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
129
130out:
131 return;
132}
133
134static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
135{
136 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
137 V9fsVirtioState *v = VIRTIO_9P(dev);
138 V9fsState *s = &v->state;
139
140 virtio_cleanup(vdev);
141 v9fs_device_unrealize_common(s, errp);
142}
143
144static void virtio_9p_reset(VirtIODevice *vdev)
145{
146 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
147
148 v9fs_reset(&v->state);
149}
150
151ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
152 const char *fmt, va_list ap)
153{
154 V9fsState *s = pdu->s;
155 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
156 VirtQueueElement *elem = v->elems[pdu->idx];
157
158 return v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
159}
160
161ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
162 const char *fmt, va_list ap)
163{
164 V9fsState *s = pdu->s;
165 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
166 VirtQueueElement *elem = v->elems[pdu->idx];
167
168 return v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
169}
170
171void virtio_init_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
172 unsigned int *pniov, bool is_write)
173{
174 V9fsState *s = pdu->s;
175 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
176 VirtQueueElement *elem = v->elems[pdu->idx];
177
178 if (is_write) {
179 *piov = elem->out_sg;
180 *pniov = elem->out_num;
181 } else {
182 *piov = elem->in_sg;
183 *pniov = elem->in_num;
184 }
185}
186
187
188
189static const VMStateDescription vmstate_virtio_9p = {
190 .name = "virtio-9p",
191 .minimum_version_id = 1,
192 .version_id = 1,
193 .fields = (VMStateField[]) {
194 VMSTATE_VIRTIO_DEVICE,
195 VMSTATE_END_OF_LIST()
196 },
197};
198
199static Property virtio_9p_properties[] = {
200 DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
201 DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
202 DEFINE_PROP_END_OF_LIST(),
203};
204
205static void virtio_9p_class_init(ObjectClass *klass, void *data)
206{
207 DeviceClass *dc = DEVICE_CLASS(klass);
208 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
209
210 dc->props = virtio_9p_properties;
211 dc->vmsd = &vmstate_virtio_9p;
212 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
213 vdc->realize = virtio_9p_device_realize;
214 vdc->unrealize = virtio_9p_device_unrealize;
215 vdc->get_features = virtio_9p_get_features;
216 vdc->get_config = virtio_9p_get_config;
217 vdc->reset = virtio_9p_reset;
218}
219
220static const TypeInfo virtio_device_info = {
221 .name = TYPE_VIRTIO_9P,
222 .parent = TYPE_VIRTIO_DEVICE,
223 .instance_size = sizeof(V9fsVirtioState),
224 .class_init = virtio_9p_class_init,
225};
226
227static void virtio_9p_register_types(void)
228{
229 type_register_static(&virtio_device_info);
230}
231
232type_init(virtio_9p_register_types)
233
