4 * Copyright IBM, Corp. 2010
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
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"
20 #include "hw/virtio/virtio-access.h"
23 static void virtio_9p_push_and_notify(V9fsPDU *pdu)
25 V9fsState *s = pdu->s;
26 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
27 VirtQueueElement *elem = v->elems[pdu->idx];
29 /* push onto queue and notify */
30 virtqueue_push(v->vq, elem, pdu->size);
32 v->elems[pdu->idx] = NULL;
34 /* FIXME: we should batch these completions */
35 virtio_notify(VIRTIO_DEVICE(v), v->vq);
38 static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
40 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
41 V9fsState *s = &v->state;
44 VirtQueueElement *elem;
46 while ((pdu = pdu_alloc(s))) {
49 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
54 if (iov_size(elem->in_sg, elem->in_num) < 7) {
56 "The guest sent a VirtFS request without space for "
61 len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, 7);
63 virtio_error(vdev, "The guest sent a malformed VirtFS request: "
64 "header size is %zd, should be 7", len);
68 v->elems[pdu->idx] = elem;
70 pdu_submit(pdu, &out);
76 virtqueue_detach_element(vq, elem, 0);
82 static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
85 virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
89 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
92 struct virtio_9p_config *cfg;
93 V9fsVirtioState *v = VIRTIO_9P(vdev);
94 V9fsState *s = &v->state;
97 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
98 virtio_stw_p(vdev, &cfg->tag_len, len);
99 /* We don't copy the terminating null to config space */
100 memcpy(cfg->tag, s->tag, len);
101 memcpy(config, cfg, v->config_size);
105 static void virtio_9p_reset(VirtIODevice *vdev)
107 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
109 v9fs_reset(&v->state);
112 static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
113 const char *fmt, va_list ap)
115 V9fsState *s = pdu->s;
116 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
117 VirtQueueElement *elem = v->elems[pdu->idx];
120 ret = v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
122 VirtIODevice *vdev = VIRTIO_DEVICE(v);
124 virtio_error(vdev, "Failed to encode VirtFS reply type %d",
130 static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
131 const char *fmt, va_list ap)
133 V9fsState *s = pdu->s;
134 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
135 VirtQueueElement *elem = v->elems[pdu->idx];
138 ret = v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
140 VirtIODevice *vdev = VIRTIO_DEVICE(v);
142 virtio_error(vdev, "Failed to decode VirtFS request type %d", pdu->id);
147 static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
148 unsigned int *pniov, size_t size)
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);
155 if (buf_size < size) {
156 VirtIODevice *vdev = VIRTIO_DEVICE(v);
159 "VirtFS reply type %d needs %zu bytes, buffer has %zu",
160 pdu->id + 1, size, buf_size);
164 *pniov = elem->in_num;
167 static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
168 unsigned int *pniov, size_t size)
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);
175 if (buf_size < size) {
176 VirtIODevice *vdev = VIRTIO_DEVICE(v);
179 "VirtFS request type %d needs %zu bytes, buffer has %zu",
180 pdu->id, size, buf_size);
183 *piov = elem->out_sg;
184 *pniov = elem->out_num;
187 static 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,
195 static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
197 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
198 V9fsVirtioState *v = VIRTIO_9P(dev);
199 V9fsState *s = &v->state;
201 if (v9fs_device_realize_common(s, &virtio_9p_transport, errp)) {
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);
210 static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
212 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
213 V9fsVirtioState *v = VIRTIO_9P(dev);
214 V9fsState *s = &v->state;
216 virtio_cleanup(vdev);
217 v9fs_device_unrealize_common(s, errp);
220 /* virtio-9p device */
222 static const VMStateDescription vmstate_virtio_9p = {
224 .minimum_version_id = 1,
226 .fields = (VMStateField[]) {
227 VMSTATE_VIRTIO_DEVICE,
228 VMSTATE_END_OF_LIST()
232 static 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(),
238 static void virtio_9p_class_init(ObjectClass *klass, void *data)
240 DeviceClass *dc = DEVICE_CLASS(klass);
241 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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;
253 static 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,
260 static void virtio_9p_register_types(void)
262 type_register_static(&virtio_device_info);
265 type_init(virtio_9p_register_types)