xen/pt: allow QEMU to request MSI unmasking at bind time
[qemu.git] / hw / 9pfs / virtio-9p-device.c
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
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
23 static const struct V9fsTransport virtio_9p_transport;
24
25 static void virtio_9p_push_and_notify(V9fsPDU *pdu)
26 {
27 V9fsState *s = pdu->s;
28 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
29 VirtQueueElement *elem = v->elems[pdu->idx];
30
31 /* push onto queue and notify */
32 virtqueue_push(v->vq, elem, pdu->size);
33 g_free(elem);
34 v->elems[pdu->idx] = NULL;
35
36 /* FIXME: we should batch these completions */
37 virtio_notify(VIRTIO_DEVICE(v), v->vq);
38 }
39
40 static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
41 {
42 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
43 V9fsState *s = &v->state;
44 V9fsPDU *pdu;
45 ssize_t len;
46 VirtQueueElement *elem;
47
48 while ((pdu = pdu_alloc(s))) {
49 P9MsgHeader out;
50
51 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
52 if (!elem) {
53 goto out_free_pdu;
54 }
55
56 if (iov_size(elem->in_sg, elem->in_num) < 7) {
57 virtio_error(vdev,
58 "The guest sent a VirtFS request without space for "
59 "the reply");
60 goto out_free_req;
61 }
62
63 len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, 7);
64 if (len != 7) {
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 }
69
70 v->elems[pdu->idx] = elem;
71
72 pdu_submit(pdu, &out);
73 }
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);
82 }
83
84 static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
85 Error **errp)
86 {
87 virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
88 return features;
89 }
90
91 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
92 {
93 int len;
94 struct virtio_9p_config *cfg;
95 V9fsVirtioState *v = VIRTIO_9P(vdev);
96 V9fsState *s = &v->state;
97
98 len = strlen(s->tag);
99 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
100 virtio_stw_p(vdev, &cfg->tag_len, len);
101 /* We don't copy the terminating null to config space */
102 memcpy(cfg->tag, s->tag, len);
103 memcpy(config, cfg, v->config_size);
104 g_free(cfg);
105 }
106
107 static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
108 {
109 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
110 V9fsVirtioState *v = VIRTIO_9P(dev);
111 V9fsState *s = &v->state;
112
113 if (v9fs_device_realize_common(s, errp)) {
114 goto out;
115 }
116
117 v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag);
118 virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size);
119 v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
120 v9fs_register_transport(s, &virtio_9p_transport);
121
122 out:
123 return;
124 }
125
126 static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
127 {
128 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
129 V9fsVirtioState *v = VIRTIO_9P(dev);
130 V9fsState *s = &v->state;
131
132 virtio_cleanup(vdev);
133 v9fs_device_unrealize_common(s, errp);
134 }
135
136 static void virtio_9p_reset(VirtIODevice *vdev)
137 {
138 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
139
140 v9fs_reset(&v->state);
141 }
142
143 static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
144 const char *fmt, va_list ap)
145 {
146 V9fsState *s = pdu->s;
147 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
148 VirtQueueElement *elem = v->elems[pdu->idx];
149 ssize_t ret;
150
151 ret = v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
152 if (ret < 0) {
153 VirtIODevice *vdev = VIRTIO_DEVICE(v);
154
155 virtio_error(vdev, "Failed to encode VirtFS reply type %d",
156 pdu->id + 1);
157 }
158 return ret;
159 }
160
161 static ssize_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 ssize_t ret;
168
169 ret = v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
170 if (ret < 0) {
171 VirtIODevice *vdev = VIRTIO_DEVICE(v);
172
173 virtio_error(vdev, "Failed to decode VirtFS request type %d", pdu->id);
174 }
175 return ret;
176 }
177
178 static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
179 unsigned int *pniov, size_t size)
180 {
181 V9fsState *s = pdu->s;
182 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
183 VirtQueueElement *elem = v->elems[pdu->idx];
184 size_t buf_size = iov_size(elem->in_sg, elem->in_num);
185
186 if (buf_size < size) {
187 VirtIODevice *vdev = VIRTIO_DEVICE(v);
188
189 virtio_error(vdev,
190 "VirtFS reply type %d needs %zu bytes, buffer has %zu",
191 pdu->id + 1, size, buf_size);
192 }
193
194 *piov = elem->in_sg;
195 *pniov = elem->in_num;
196 }
197
198 static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
199 unsigned int *pniov, size_t size)
200 {
201 V9fsState *s = pdu->s;
202 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
203 VirtQueueElement *elem = v->elems[pdu->idx];
204 size_t buf_size = iov_size(elem->out_sg, elem->out_num);
205
206 if (buf_size < size) {
207 VirtIODevice *vdev = VIRTIO_DEVICE(v);
208
209 virtio_error(vdev,
210 "VirtFS request type %d needs %zu bytes, buffer has %zu",
211 pdu->id, size, buf_size);
212 }
213
214 *piov = elem->out_sg;
215 *pniov = elem->out_num;
216 }
217
218 static const struct V9fsTransport virtio_9p_transport = {
219 .pdu_vmarshal = virtio_pdu_vmarshal,
220 .pdu_vunmarshal = virtio_pdu_vunmarshal,
221 .init_in_iov_from_pdu = virtio_init_in_iov_from_pdu,
222 .init_out_iov_from_pdu = virtio_init_out_iov_from_pdu,
223 .push_and_notify = virtio_9p_push_and_notify,
224 };
225
226 /* virtio-9p device */
227
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 };
237
238 static Property virtio_9p_properties[] = {
239 DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
240 DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
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);
248
249 dc->props = virtio_9p_properties;
250 dc->vmsd = &vmstate_virtio_9p;
251 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
252 vdc->realize = virtio_9p_device_realize;
253 vdc->unrealize = virtio_9p_device_unrealize;
254 vdc->get_features = virtio_9p_get_features;
255 vdc->get_config = virtio_9p_get_config;
256 vdc->reset = virtio_9p_reset;
257 }
258
259 static const TypeInfo virtio_device_info = {
260 .name = TYPE_VIRTIO_9P,
261 .parent = TYPE_VIRTIO_DEVICE,
262 .instance_size = sizeof(V9fsVirtioState),
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)