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 "hw/i386/pc.h"
17 #include "qemu/sockets.h"
18 #include "virtio-9p.h"
19 #include "fsdev/qemu-fsdev.h"
22 #include "hw/virtio/virtio-access.h"
25 void virtio_9p_push_and_notify(V9fsPDU
*pdu
)
27 V9fsState
*s
= pdu
->s
;
28 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
29 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
31 /* push onto queue and notify */
32 virtqueue_push(v
->vq
, elem
, pdu
->size
);
34 v
->elems
[pdu
->idx
] = NULL
;
36 /* FIXME: we should batch these completions */
37 virtio_notify(VIRTIO_DEVICE(v
), v
->vq
);
40 static void handle_9p_output(VirtIODevice
*vdev
, VirtQueue
*vq
)
42 V9fsVirtioState
*v
= (V9fsVirtioState
*)vdev
;
43 V9fsState
*s
= &v
->state
;
47 while ((pdu
= pdu_alloc(s
))) {
53 VirtQueueElement
*elem
;
55 elem
= virtqueue_pop(vq
, sizeof(VirtQueueElement
));
61 BUG_ON(elem
->out_num
== 0 || elem
->in_num
== 0);
62 QEMU_BUILD_BUG_ON(sizeof out
!= 7);
64 v
->elems
[pdu
->idx
] = elem
;
65 len
= iov_to_buf(elem
->out_sg
, elem
->out_num
, 0,
67 BUG_ON(len
!= sizeof out
);
69 pdu
->size
= le32_to_cpu(out
.size_le
);
72 pdu
->tag
= le16_to_cpu(out
.tag_le
);
74 qemu_co_queue_init(&pdu
->complete
);
79 static uint64_t virtio_9p_get_features(VirtIODevice
*vdev
, uint64_t features
,
82 virtio_add_feature(&features
, VIRTIO_9P_MOUNT_TAG
);
86 static void virtio_9p_get_config(VirtIODevice
*vdev
, uint8_t *config
)
89 struct virtio_9p_config
*cfg
;
90 V9fsVirtioState
*v
= VIRTIO_9P(vdev
);
91 V9fsState
*s
= &v
->state
;
94 cfg
= g_malloc0(sizeof(struct virtio_9p_config
) + len
);
95 virtio_stw_p(vdev
, &cfg
->tag_len
, len
);
96 /* We don't copy the terminating null to config space */
97 memcpy(cfg
->tag
, s
->tag
, len
);
98 memcpy(config
, cfg
, v
->config_size
);
102 static void virtio_9p_save(QEMUFile
*f
, void *opaque
)
104 virtio_save(VIRTIO_DEVICE(opaque
), f
);
107 static int virtio_9p_load(QEMUFile
*f
, void *opaque
, int version_id
)
109 return virtio_load(VIRTIO_DEVICE(opaque
), f
, version_id
);
112 static void virtio_9p_device_realize(DeviceState
*dev
, Error
**errp
)
114 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
115 V9fsVirtioState
*v
= VIRTIO_9P(dev
);
116 V9fsState
*s
= &v
->state
;
118 if (v9fs_device_realize_common(s
, errp
)) {
122 v
->config_size
= sizeof(struct virtio_9p_config
) + strlen(s
->fsconf
.tag
);
123 virtio_init(vdev
, "virtio-9p", VIRTIO_ID_9P
, v
->config_size
);
124 v
->vq
= virtio_add_queue(vdev
, MAX_REQ
, handle_9p_output
);
125 register_savevm(dev
, "virtio-9p", -1, 1, virtio_9p_save
, virtio_9p_load
, v
);
131 static void virtio_9p_device_unrealize(DeviceState
*dev
, Error
**errp
)
133 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
134 V9fsVirtioState
*v
= VIRTIO_9P(dev
);
135 V9fsState
*s
= &v
->state
;
137 virtio_cleanup(vdev
);
138 unregister_savevm(dev
, "virtio-9p", v
);
139 v9fs_device_unrealize_common(s
, errp
);
142 ssize_t
virtio_pdu_vmarshal(V9fsPDU
*pdu
, size_t offset
,
143 const char *fmt
, va_list ap
)
145 V9fsState
*s
= pdu
->s
;
146 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
147 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
149 return v9fs_iov_vmarshal(elem
->in_sg
, elem
->in_num
, offset
, 1, fmt
, ap
);
152 ssize_t
virtio_pdu_vunmarshal(V9fsPDU
*pdu
, size_t offset
,
153 const char *fmt
, va_list ap
)
155 V9fsState
*s
= pdu
->s
;
156 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
157 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
159 return v9fs_iov_vunmarshal(elem
->out_sg
, elem
->out_num
, offset
, 1, fmt
, ap
);
162 void virtio_init_iov_from_pdu(V9fsPDU
*pdu
, struct iovec
**piov
,
163 unsigned int *pniov
, bool is_write
)
165 V9fsState
*s
= pdu
->s
;
166 V9fsVirtioState
*v
= container_of(s
, V9fsVirtioState
, state
);
167 VirtQueueElement
*elem
= v
->elems
[pdu
->idx
];
170 *piov
= elem
->out_sg
;
171 *pniov
= elem
->out_num
;
174 *pniov
= elem
->in_num
;
178 /* virtio-9p device */
180 static Property virtio_9p_properties
[] = {
181 DEFINE_PROP_STRING("mount_tag", V9fsVirtioState
, state
.fsconf
.tag
),
182 DEFINE_PROP_STRING("fsdev", V9fsVirtioState
, state
.fsconf
.fsdev_id
),
183 DEFINE_PROP_END_OF_LIST(),
186 static void virtio_9p_class_init(ObjectClass
*klass
, void *data
)
188 DeviceClass
*dc
= DEVICE_CLASS(klass
);
189 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
191 dc
->props
= virtio_9p_properties
;
192 set_bit(DEVICE_CATEGORY_STORAGE
, dc
->categories
);
193 vdc
->realize
= virtio_9p_device_realize
;
194 vdc
->unrealize
= virtio_9p_device_unrealize
;
195 vdc
->get_features
= virtio_9p_get_features
;
196 vdc
->get_config
= virtio_9p_get_config
;
199 static const TypeInfo virtio_device_info
= {
200 .name
= TYPE_VIRTIO_9P
,
201 .parent
= TYPE_VIRTIO_DEVICE
,
202 .instance_size
= sizeof(V9fsVirtioState
),
203 .class_init
= virtio_9p_class_init
,
206 static void virtio_9p_register_types(void)
208 type_register_static(&virtio_device_info
);
211 type_init(virtio_9p_register_types
)