mirror of https://github.com/proxmox/mirror_qemu
210 lines
5.7 KiB
C
210 lines
5.7 KiB
C
/*
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* Virtio 9p backend
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "hw/virtio/virtio.h"
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#include "qemu/sockets.h"
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#include "virtio-9p.h"
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#include "fsdev/qemu-fsdev.h"
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#include "coth.h"
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#include "hw/virtio/virtio-access.h"
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#include "qemu/iov.h"
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void virtio_9p_push_and_notify(V9fsPDU *pdu)
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{
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V9fsState *s = pdu->s;
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V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
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VirtQueueElement *elem = v->elems[pdu->idx];
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/* push onto queue and notify */
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virtqueue_push(v->vq, elem, pdu->size);
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g_free(elem);
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v->elems[pdu->idx] = NULL;
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/* FIXME: we should batch these completions */
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virtio_notify(VIRTIO_DEVICE(v), v->vq);
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}
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static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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V9fsVirtioState *v = (V9fsVirtioState *)vdev;
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V9fsState *s = &v->state;
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V9fsPDU *pdu;
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ssize_t len;
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while ((pdu = pdu_alloc(s))) {
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struct {
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uint32_t size_le;
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uint8_t id;
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uint16_t tag_le;
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} QEMU_PACKED out;
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VirtQueueElement *elem;
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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!elem) {
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pdu_free(pdu);
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break;
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}
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BUG_ON(elem->out_num == 0 || elem->in_num == 0);
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QEMU_BUILD_BUG_ON(sizeof out != 7);
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v->elems[pdu->idx] = elem;
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len = iov_to_buf(elem->out_sg, elem->out_num, 0,
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&out, sizeof out);
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BUG_ON(len != sizeof out);
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pdu->size = le32_to_cpu(out.size_le);
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pdu->id = out.id;
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pdu->tag = le16_to_cpu(out.tag_le);
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qemu_co_queue_init(&pdu->complete);
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pdu_submit(pdu);
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}
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}
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static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
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Error **errp)
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{
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virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
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return features;
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}
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static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
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{
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int len;
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struct virtio_9p_config *cfg;
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V9fsVirtioState *v = VIRTIO_9P(vdev);
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V9fsState *s = &v->state;
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len = strlen(s->tag);
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cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
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virtio_stw_p(vdev, &cfg->tag_len, len);
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/* We don't copy the terminating null to config space */
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memcpy(cfg->tag, s->tag, len);
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memcpy(config, cfg, v->config_size);
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g_free(cfg);
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}
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static void virtio_9p_save(QEMUFile *f, void *opaque)
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{
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virtio_save(VIRTIO_DEVICE(opaque), f);
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}
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static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
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{
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return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
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}
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static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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V9fsVirtioState *v = VIRTIO_9P(dev);
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V9fsState *s = &v->state;
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if (v9fs_device_realize_common(s, errp)) {
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goto out;
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}
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v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag);
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virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size);
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v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
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register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, v);
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out:
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return;
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}
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static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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V9fsVirtioState *v = VIRTIO_9P(dev);
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V9fsState *s = &v->state;
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virtio_cleanup(vdev);
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unregister_savevm(dev, "virtio-9p", v);
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v9fs_device_unrealize_common(s, errp);
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}
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ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
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const char *fmt, va_list ap)
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{
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V9fsState *s = pdu->s;
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V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
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VirtQueueElement *elem = v->elems[pdu->idx];
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return v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
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}
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ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
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const char *fmt, va_list ap)
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{
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V9fsState *s = pdu->s;
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V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
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VirtQueueElement *elem = v->elems[pdu->idx];
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return v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
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}
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void virtio_init_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
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unsigned int *pniov, bool is_write)
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{
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V9fsState *s = pdu->s;
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V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
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VirtQueueElement *elem = v->elems[pdu->idx];
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if (is_write) {
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*piov = elem->out_sg;
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*pniov = elem->out_num;
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} else {
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*piov = elem->in_sg;
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*pniov = elem->in_num;
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}
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}
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/* virtio-9p device */
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static Property virtio_9p_properties[] = {
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DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
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DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void virtio_9p_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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dc->props = virtio_9p_properties;
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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vdc->realize = virtio_9p_device_realize;
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vdc->unrealize = virtio_9p_device_unrealize;
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vdc->get_features = virtio_9p_get_features;
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vdc->get_config = virtio_9p_get_config;
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}
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static const TypeInfo virtio_device_info = {
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.name = TYPE_VIRTIO_9P,
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.parent = TYPE_VIRTIO_DEVICE,
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.instance_size = sizeof(V9fsVirtioState),
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.class_init = virtio_9p_class_init,
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};
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static void virtio_9p_register_types(void)
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{
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type_register_static(&virtio_device_info);
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}
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type_init(virtio_9p_register_types)
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