2011-06-01 11:05:13 +04:00
|
|
|
/*
|
|
|
|
* Virtio 9p backend
|
|
|
|
*
|
|
|
|
* Copyright IBM, Corp. 2010
|
|
|
|
*
|
|
|
|
* Authors:
|
|
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
|
|
*
|
|
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
|
|
* the COPYING file in the top-level directory.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
2016-01-26 21:17:07 +03:00
|
|
|
#include "qemu/osdep.h"
|
2013-02-05 20:06:20 +04:00
|
|
|
#include "hw/virtio/virtio.h"
|
2012-12-17 21:20:00 +04:00
|
|
|
#include "qemu/sockets.h"
|
2011-06-01 11:05:13 +04:00
|
|
|
#include "virtio-9p.h"
|
|
|
|
#include "fsdev/qemu-fsdev.h"
|
2015-11-18 20:57:30 +03:00
|
|
|
#include "coth.h"
|
2014-06-24 21:49:49 +04:00
|
|
|
#include "hw/virtio/virtio-access.h"
|
2016-01-07 21:37:25 +03:00
|
|
|
#include "qemu/iov.h"
|
2011-06-01 11:05:13 +04:00
|
|
|
|
2017-01-03 19:28:44 +03:00
|
|
|
static void virtio_9p_push_and_notify(V9fsPDU *pdu)
|
2016-01-07 21:30:29 +03:00
|
|
|
{
|
|
|
|
V9fsState *s = pdu->s;
|
2016-01-11 12:29:37 +03:00
|
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
2016-02-04 17:26:51 +03:00
|
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
2016-01-07 21:30:29 +03:00
|
|
|
|
|
|
|
/* push onto queue and notify */
|
2016-01-11 12:29:37 +03:00
|
|
|
virtqueue_push(v->vq, elem, pdu->size);
|
2016-02-04 17:26:51 +03:00
|
|
|
g_free(elem);
|
|
|
|
v->elems[pdu->idx] = NULL;
|
2016-01-07 21:30:29 +03:00
|
|
|
|
|
|
|
/* FIXME: we should batch these completions */
|
2016-01-11 12:29:37 +03:00
|
|
|
virtio_notify(VIRTIO_DEVICE(v), v->vq);
|
2016-01-07 21:30:29 +03:00
|
|
|
}
|
|
|
|
|
2016-01-07 21:37:25 +03:00
|
|
|
static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
|
|
{
|
2016-01-11 12:29:37 +03:00
|
|
|
V9fsVirtioState *v = (V9fsVirtioState *)vdev;
|
|
|
|
V9fsState *s = &v->state;
|
2016-01-07 21:37:25 +03:00
|
|
|
V9fsPDU *pdu;
|
|
|
|
ssize_t len;
|
2016-09-30 18:12:58 +03:00
|
|
|
VirtQueueElement *elem;
|
2016-01-07 21:37:25 +03:00
|
|
|
|
2016-01-11 12:29:37 +03:00
|
|
|
while ((pdu = pdu_alloc(s))) {
|
2017-03-21 23:51:34 +03:00
|
|
|
P9MsgHeader out;
|
2016-01-07 21:37:25 +03:00
|
|
|
|
2016-02-04 17:26:51 +03:00
|
|
|
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
|
|
|
|
if (!elem) {
|
2016-09-30 18:12:58 +03:00
|
|
|
goto out_free_pdu;
|
2016-01-11 12:29:37 +03:00
|
|
|
}
|
|
|
|
|
2017-06-29 16:11:50 +03:00
|
|
|
if (iov_size(elem->in_sg, elem->in_num) < 7) {
|
2016-09-30 18:12:58 +03:00
|
|
|
virtio_error(vdev,
|
|
|
|
"The guest sent a VirtFS request without space for "
|
|
|
|
"the reply");
|
|
|
|
goto out_free_req;
|
|
|
|
}
|
2016-01-07 21:37:25 +03:00
|
|
|
|
2017-06-29 16:11:50 +03:00
|
|
|
len = iov_to_buf(elem->out_sg, elem->out_num, 0, &out, 7);
|
|
|
|
if (len != 7) {
|
2016-09-30 18:12:58 +03:00
|
|
|
virtio_error(vdev, "The guest sent a malformed VirtFS request: "
|
|
|
|
"header size is %zd, should be 7", len);
|
|
|
|
goto out_free_req;
|
|
|
|
}
|
2016-01-07 21:37:25 +03:00
|
|
|
|
2017-06-29 16:11:50 +03:00
|
|
|
v->elems[pdu->idx] = elem;
|
|
|
|
|
2017-05-25 11:30:13 +03:00
|
|
|
pdu_submit(pdu, &out);
|
2016-01-07 21:37:25 +03:00
|
|
|
}
|
2016-09-30 18:12:58 +03:00
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
out_free_req:
|
|
|
|
virtqueue_detach_element(vq, elem, 0);
|
|
|
|
g_free(elem);
|
|
|
|
out_free_pdu:
|
|
|
|
pdu_free(pdu);
|
2016-01-07 21:37:25 +03:00
|
|
|
}
|
|
|
|
|
2015-07-27 12:49:19 +03:00
|
|
|
static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
|
|
|
|
Error **errp)
|
2011-06-01 11:05:13 +04:00
|
|
|
{
|
2014-12-11 16:25:05 +03:00
|
|
|
virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
|
2011-06-01 11:05:13 +04:00
|
|
|
return features;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
|
|
|
|
{
|
2011-12-04 21:05:28 +04:00
|
|
|
int len;
|
2011-06-01 11:05:13 +04:00
|
|
|
struct virtio_9p_config *cfg;
|
2016-01-11 12:29:37 +03:00
|
|
|
V9fsVirtioState *v = VIRTIO_9P(vdev);
|
|
|
|
V9fsState *s = &v->state;
|
2011-06-01 11:05:13 +04:00
|
|
|
|
2011-12-04 21:05:28 +04:00
|
|
|
len = strlen(s->tag);
|
|
|
|
cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
|
2014-06-24 21:49:49 +04:00
|
|
|
virtio_stw_p(vdev, &cfg->tag_len, len);
|
2011-12-04 21:05:28 +04:00
|
|
|
/* We don't copy the terminating null to config space */
|
|
|
|
memcpy(cfg->tag, s->tag, len);
|
2016-01-11 12:29:37 +03:00
|
|
|
memcpy(config, cfg, v->config_size);
|
2011-08-21 07:09:37 +04:00
|
|
|
g_free(cfg);
|
2011-06-01 11:05:13 +04:00
|
|
|
}
|
|
|
|
|
2016-10-17 15:13:58 +03:00
|
|
|
static void virtio_9p_reset(VirtIODevice *vdev)
|
|
|
|
{
|
|
|
|
V9fsVirtioState *v = (V9fsVirtioState *)vdev;
|
|
|
|
|
|
|
|
v9fs_reset(&v->state);
|
|
|
|
}
|
|
|
|
|
2017-01-03 19:28:44 +03:00
|
|
|
static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
|
|
|
|
const char *fmt, va_list ap)
|
2015-12-03 15:40:28 +03:00
|
|
|
{
|
2016-01-11 12:29:37 +03:00
|
|
|
V9fsState *s = pdu->s;
|
|
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
2016-02-04 17:26:51 +03:00
|
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
2017-06-29 16:11:51 +03:00
|
|
|
ssize_t ret;
|
2016-01-11 12:29:37 +03:00
|
|
|
|
2017-06-29 16:11:51 +03:00
|
|
|
ret = v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
|
|
|
|
if (ret < 0) {
|
|
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(v);
|
|
|
|
|
|
|
|
virtio_error(vdev, "Failed to encode VirtFS reply type %d",
|
|
|
|
pdu->id + 1);
|
|
|
|
}
|
|
|
|
return ret;
|
2015-12-03 15:40:28 +03:00
|
|
|
}
|
|
|
|
|
2017-01-03 19:28:44 +03:00
|
|
|
static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
|
|
|
|
const char *fmt, va_list ap)
|
2015-12-03 15:40:28 +03:00
|
|
|
{
|
2016-01-11 12:29:37 +03:00
|
|
|
V9fsState *s = pdu->s;
|
|
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
2016-02-04 17:26:51 +03:00
|
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
2017-06-29 16:11:51 +03:00
|
|
|
ssize_t ret;
|
|
|
|
|
|
|
|
ret = v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
|
|
|
|
if (ret < 0) {
|
|
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(v);
|
2016-01-11 12:29:37 +03:00
|
|
|
|
2017-06-29 16:11:51 +03:00
|
|
|
virtio_error(vdev, "Failed to decode VirtFS request type %d", pdu->id);
|
|
|
|
}
|
|
|
|
return ret;
|
2015-12-03 15:40:28 +03:00
|
|
|
}
|
|
|
|
|
2017-01-03 19:28:44 +03:00
|
|
|
static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
|
|
|
|
unsigned int *pniov, size_t size)
|
2015-12-03 16:21:51 +03:00
|
|
|
{
|
2016-01-11 12:29:37 +03:00
|
|
|
V9fsState *s = pdu->s;
|
|
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
2016-02-04 17:26:51 +03:00
|
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
2017-06-29 16:11:51 +03:00
|
|
|
size_t buf_size = iov_size(elem->in_sg, elem->in_num);
|
|
|
|
|
|
|
|
if (buf_size < size) {
|
|
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(v);
|
|
|
|
|
|
|
|
virtio_error(vdev,
|
|
|
|
"VirtFS reply type %d needs %zu bytes, buffer has %zu",
|
|
|
|
pdu->id + 1, size, buf_size);
|
|
|
|
}
|
2016-01-11 12:29:37 +03:00
|
|
|
|
2017-01-03 19:28:44 +03:00
|
|
|
*piov = elem->in_sg;
|
|
|
|
*pniov = elem->in_num;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
|
2017-06-29 16:11:51 +03:00
|
|
|
unsigned int *pniov, size_t size)
|
2017-01-03 19:28:44 +03:00
|
|
|
{
|
|
|
|
V9fsState *s = pdu->s;
|
|
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
|
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
2017-06-29 16:11:51 +03:00
|
|
|
size_t buf_size = iov_size(elem->out_sg, elem->out_num);
|
|
|
|
|
|
|
|
if (buf_size < size) {
|
|
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(v);
|
|
|
|
|
|
|
|
virtio_error(vdev,
|
|
|
|
"VirtFS request type %d needs %zu bytes, buffer has %zu",
|
|
|
|
pdu->id, size, buf_size);
|
|
|
|
}
|
2017-01-03 19:28:44 +03:00
|
|
|
|
|
|
|
*piov = elem->out_sg;
|
|
|
|
*pniov = elem->out_num;
|
2015-12-03 16:21:51 +03:00
|
|
|
}
|
|
|
|
|
2018-01-08 13:18:22 +03:00
|
|
|
static const V9fsTransport virtio_9p_transport = {
|
2017-01-03 19:28:44 +03:00
|
|
|
.pdu_vmarshal = virtio_pdu_vmarshal,
|
|
|
|
.pdu_vunmarshal = virtio_pdu_vunmarshal,
|
2017-01-03 19:28:44 +03:00
|
|
|
.init_in_iov_from_pdu = virtio_init_in_iov_from_pdu,
|
|
|
|
.init_out_iov_from_pdu = virtio_init_out_iov_from_pdu,
|
2017-01-03 19:28:44 +03:00
|
|
|
.push_and_notify = virtio_9p_push_and_notify,
|
|
|
|
};
|
|
|
|
|
2018-01-08 13:18:22 +03:00
|
|
|
static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
|
|
|
|
{
|
|
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
|
|
V9fsVirtioState *v = VIRTIO_9P(dev);
|
|
|
|
V9fsState *s = &v->state;
|
|
|
|
|
|
|
|
if (v9fs_device_realize_common(s, errp)) {
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag);
|
|
|
|
virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size);
|
|
|
|
v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
|
|
|
|
v9fs_register_transport(s, &virtio_9p_transport);
|
|
|
|
|
|
|
|
out:
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
|
|
|
|
{
|
|
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
|
|
V9fsVirtioState *v = VIRTIO_9P(dev);
|
|
|
|
V9fsState *s = &v->state;
|
|
|
|
|
|
|
|
virtio_cleanup(vdev);
|
|
|
|
v9fs_device_unrealize_common(s, errp);
|
|
|
|
}
|
|
|
|
|
2013-04-23 13:08:40 +04:00
|
|
|
/* virtio-9p device */
|
|
|
|
|
2016-10-06 15:55:42 +03:00
|
|
|
static const VMStateDescription vmstate_virtio_9p = {
|
|
|
|
.name = "virtio-9p",
|
|
|
|
.minimum_version_id = 1,
|
|
|
|
.version_id = 1,
|
|
|
|
.fields = (VMStateField[]) {
|
|
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
|
|
VMSTATE_END_OF_LIST()
|
|
|
|
},
|
|
|
|
};
|
2016-07-14 20:22:52 +03:00
|
|
|
|
2013-04-23 13:08:40 +04:00
|
|
|
static Property virtio_9p_properties[] = {
|
2016-01-11 12:29:37 +03:00
|
|
|
DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
|
|
|
|
DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
|
2013-04-23 13:08:40 +04:00
|
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
|
|
};
|
|
|
|
|
|
|
|
static void virtio_9p_class_init(ObjectClass *klass, void *data)
|
|
|
|
{
|
|
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
2013-07-30 03:04:01 +04:00
|
|
|
|
2013-04-23 13:08:40 +04:00
|
|
|
dc->props = virtio_9p_properties;
|
2016-07-14 20:22:52 +03:00
|
|
|
dc->vmsd = &vmstate_virtio_9p;
|
2013-07-29 18:17:45 +04:00
|
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
2013-07-30 03:04:01 +04:00
|
|
|
vdc->realize = virtio_9p_device_realize;
|
2015-12-08 18:54:57 +03:00
|
|
|
vdc->unrealize = virtio_9p_device_unrealize;
|
2013-04-23 13:08:40 +04:00
|
|
|
vdc->get_features = virtio_9p_get_features;
|
|
|
|
vdc->get_config = virtio_9p_get_config;
|
2016-10-17 15:13:58 +03:00
|
|
|
vdc->reset = virtio_9p_reset;
|
2013-04-23 13:08:40 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static const TypeInfo virtio_device_info = {
|
|
|
|
.name = TYPE_VIRTIO_9P,
|
|
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
2016-01-11 12:29:37 +03:00
|
|
|
.instance_size = sizeof(V9fsVirtioState),
|
2013-04-23 13:08:40 +04:00
|
|
|
.class_init = virtio_9p_class_init,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void virtio_9p_register_types(void)
|
|
|
|
{
|
|
|
|
type_register_static(&virtio_device_info);
|
|
|
|
}
|
|
|
|
|
|
|
|
type_init(virtio_9p_register_types)
|