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 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
))) {
53 elem
= virtqueue_pop(vq
, sizeof(VirtQueueElement
));
58 if (elem
->in_num
== 0) {
60 "The guest sent a VirtFS request without space for "
64 QEMU_BUILD_BUG_ON(sizeof(out
) != 7);
66 v
->elems
[pdu
->idx
] = elem
;
67 len
= iov_to_buf(elem
->out_sg
, elem
->out_num
, 0,
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
);
75 pdu
->size
= le32_to_cpu(out
.size_le
);
78 pdu
->tag
= le16_to_cpu(out
.tag_le
);
80 qemu_co_queue_init(&pdu
->complete
);
87 virtqueue_detach_element(vq
, elem
, 0);
93 static uint64_t virtio_9p_get_features(VirtIODevice
*vdev
, uint64_t features
,
96 virtio_add_feature(&features
, VIRTIO_9P_MOUNT_TAG
);
100 static void virtio_9p_get_config(VirtIODevice
*vdev
, uint8_t *config
)
103 struct virtio_9p_config
*cfg
;
104 V9fsVirtioState
*v
= VIRTIO_9P(vdev
);
105 V9fsState
*s
= &v
->state
;
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 /* We don't copy the terminating null to config space */
111 memcpy(cfg
->tag
, s
->tag
, len
);
112 memcpy(config
, cfg
, v
->config_size
);
116 static void virtio_9p_device_realize(DeviceState
*dev
, Error
**errp
)
118 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
119 V9fsVirtioState
*v
= VIRTIO_9P(dev
);
120 V9fsState
*s
= &v
->state
;
122 if (v9fs_device_realize_common(s
, errp
)) {
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
);
134 static void virtio_9p_device_unrealize(DeviceState
*dev
, Error
**errp
)
136 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
137 V9fsVirtioState
*v
= VIRTIO_9P(dev
);
138 V9fsState
*s
= &v
->state
;
140 virtio_cleanup(vdev
);
141 v9fs_device_unrealize_common(s
, errp
);
144 static void virtio_9p_reset(VirtIODevice
*vdev
)
146 V9fsVirtioState
*v
= (V9fsVirtioState
*)vdev
;
148 v9fs_reset(&v
->state
);
151 ssize_t
virtio_pdu_vmarshal(V9fsPDU
*pdu
, size_t offset
,
152 const char *fmt
, va_list ap
)
154 V9fsState
*s
= pdu
->s
;
155 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
156 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
158 return v9fs_iov_vmarshal(elem
->in_sg
, elem
->in_num
, offset
, 1, fmt
, ap
);
161 ssize_t
virtio_pdu_vunmarshal(V9fsPDU
*pdu
, size_t offset
,
162 const char *fmt
, va_list ap
)
164 V9fsState
*s
= pdu
->s
;
165 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
166 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
168 return v9fs_iov_vunmarshal(elem
->out_sg
, elem
->out_num
, offset
, 1, fmt
, ap
);
171 void virtio_init_iov_from_pdu(V9fsPDU
*pdu
, struct iovec
**piov
,
172 unsigned int *pniov
, bool is_write
)
174 V9fsState
*s
= pdu
->s
;
175 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
176 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
179 *piov
= elem
->out_sg
;
180 *pniov
= elem
->out_num
;
183 *pniov
= elem
->in_num
;
187 /* virtio-9p device */
189 static const VMStateDescription vmstate_virtio_9p
= {
191 .minimum_version_id
= 1,
193 .fields
= (VMStateField
[]) {
194 VMSTATE_VIRTIO_DEVICE
,
195 VMSTATE_END_OF_LIST()
199 static 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(),
205 static void virtio_9p_class_init(ObjectClass
*klass
, void *data
)
207 DeviceClass
*dc
= DEVICE_CLASS(klass
);
208 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
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
;
220 static 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
,
227 static void virtio_9p_register_types(void)
229 type_register_static(&virtio_device_info
);
232 type_init(virtio_9p_register_types
)