210 lines
5.7 KiB
C
210 lines
5.7 KiB
C
/*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "hw/virtio/virtio.h"
|
|
#include "qemu/sockets.h"
|
|
#include "virtio-9p.h"
|
|
#include "fsdev/qemu-fsdev.h"
|
|
#include "coth.h"
|
|
#include "hw/virtio/virtio-access.h"
|
|
#include "qemu/iov.h"
|
|
|
|
void virtio_9p_push_and_notify(V9fsPDU *pdu)
|
|
{
|
|
V9fsState *s = pdu->s;
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
|
|
|
/* push onto queue and notify */
|
|
virtqueue_push(v->vq, elem, pdu->size);
|
|
g_free(elem);
|
|
v->elems[pdu->idx] = NULL;
|
|
|
|
/* FIXME: we should batch these completions */
|
|
virtio_notify(VIRTIO_DEVICE(v), v->vq);
|
|
}
|
|
|
|
static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
V9fsVirtioState *v = (V9fsVirtioState *)vdev;
|
|
V9fsState *s = &v->state;
|
|
V9fsPDU *pdu;
|
|
ssize_t len;
|
|
|
|
while ((pdu = pdu_alloc(s))) {
|
|
struct {
|
|
uint32_t size_le;
|
|
uint8_t id;
|
|
uint16_t tag_le;
|
|
} QEMU_PACKED out;
|
|
VirtQueueElement *elem;
|
|
|
|
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
|
|
if (!elem) {
|
|
pdu_free(pdu);
|
|
break;
|
|
}
|
|
|
|
BUG_ON(elem->out_num == 0 || elem->in_num == 0);
|
|
QEMU_BUILD_BUG_ON(sizeof out != 7);
|
|
|
|
v->elems[pdu->idx] = elem;
|
|
len = iov_to_buf(elem->out_sg, elem->out_num, 0,
|
|
&out, sizeof out);
|
|
BUG_ON(len != sizeof out);
|
|
|
|
pdu->size = le32_to_cpu(out.size_le);
|
|
|
|
pdu->id = out.id;
|
|
pdu->tag = le16_to_cpu(out.tag_le);
|
|
|
|
qemu_co_queue_init(&pdu->complete);
|
|
pdu_submit(pdu);
|
|
}
|
|
}
|
|
|
|
static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
|
|
Error **errp)
|
|
{
|
|
virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
|
|
return features;
|
|
}
|
|
|
|
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
|
|
{
|
|
int len;
|
|
struct virtio_9p_config *cfg;
|
|
V9fsVirtioState *v = VIRTIO_9P(vdev);
|
|
V9fsState *s = &v->state;
|
|
|
|
len = strlen(s->tag);
|
|
cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
|
|
virtio_stw_p(vdev, &cfg->tag_len, len);
|
|
/* We don't copy the terminating null to config space */
|
|
memcpy(cfg->tag, s->tag, len);
|
|
memcpy(config, cfg, v->config_size);
|
|
g_free(cfg);
|
|
}
|
|
|
|
static void virtio_9p_save(QEMUFile *f, void *opaque)
|
|
{
|
|
virtio_save(VIRTIO_DEVICE(opaque), f);
|
|
}
|
|
|
|
static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
|
|
}
|
|
|
|
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);
|
|
register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, v);
|
|
|
|
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);
|
|
unregister_savevm(dev, "virtio-9p", v);
|
|
v9fs_device_unrealize_common(s, errp);
|
|
}
|
|
|
|
ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
V9fsState *s = pdu->s;
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
|
|
|
return v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
|
|
}
|
|
|
|
ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
V9fsState *s = pdu->s;
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
|
|
|
return v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
|
|
}
|
|
|
|
void virtio_init_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
|
|
unsigned int *pniov, bool is_write)
|
|
{
|
|
V9fsState *s = pdu->s;
|
|
V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
|
|
VirtQueueElement *elem = v->elems[pdu->idx];
|
|
|
|
if (is_write) {
|
|
*piov = elem->out_sg;
|
|
*pniov = elem->out_num;
|
|
} else {
|
|
*piov = elem->in_sg;
|
|
*pniov = elem->in_num;
|
|
}
|
|
}
|
|
|
|
/* virtio-9p device */
|
|
|
|
static Property virtio_9p_properties[] = {
|
|
DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
|
|
DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
|
|
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);
|
|
|
|
dc->props = virtio_9p_properties;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
vdc->realize = virtio_9p_device_realize;
|
|
vdc->unrealize = virtio_9p_device_unrealize;
|
|
vdc->get_features = virtio_9p_get_features;
|
|
vdc->get_config = virtio_9p_get_config;
|
|
}
|
|
|
|
static const TypeInfo virtio_device_info = {
|
|
.name = TYPE_VIRTIO_9P,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(V9fsVirtioState),
|
|
.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)
|