/* * Virtio 9p backend * * Copyright IBM, Corp. 2010 * * Authors: * Anthony Liguori * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "hw/virtio.h" #include "hw/pc.h" #include "qemu_socket.h" #include "hw/virtio-pci.h" #include "virtio-9p.h" #include "fsdev/qemu-fsdev.h" #include "virtio-9p-xattr.h" #include "virtio-9p-coth.h" static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) { features |= 1 << VIRTIO_9P_MOUNT_TAG; return features; } static V9fsState *to_virtio_9p(VirtIODevice *vdev) { return (V9fsState *)vdev; } static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) { int len; struct virtio_9p_config *cfg; V9fsState *s = to_virtio_9p(vdev); len = strlen(s->tag); cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); stw_raw(&cfg->tag_len, len); /* We don't copy the terminating null to config space */ memcpy(cfg->tag, s->tag, len); memcpy(config, cfg, s->config_size); g_free(cfg); } VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) { V9fsState *s; int i, len; struct stat stat; FsDriverEntry *fse; V9fsPath path; s = (V9fsState *)virtio_common_init("virtio-9p", VIRTIO_ID_9P, sizeof(struct virtio_9p_config)+ MAX_TAG_LEN, sizeof(V9fsState)); /* initialize pdu allocator */ QLIST_INIT(&s->free_list); QLIST_INIT(&s->active_list); for (i = 0; i < (MAX_REQ - 1); i++) { QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); } s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); fse = get_fsdev_fsentry(conf->fsdev_id); if (!fse) { /* We don't have a fsdev identified by fsdev_id */ fprintf(stderr, "Virtio-9p device couldn't find fsdev with the " "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL"); exit(1); } if (!conf->tag) { /* we haven't specified a mount_tag */ fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n", conf->fsdev_id); exit(1); } s->ctx.export_flags = fse->export_flags; if (fse->path) { s->ctx.fs_root = g_strdup(fse->path); } else { s->ctx.fs_root = NULL; } s->ctx.exops.get_st_gen = NULL; if (fse->export_flags & V9FS_SM_PASSTHROUGH) { s->ctx.xops = passthrough_xattr_ops; } else if (fse->export_flags & V9FS_SM_MAPPED) { s->ctx.xops = mapped_xattr_ops; } else if (fse->export_flags & V9FS_SM_NONE) { s->ctx.xops = none_xattr_ops; } len = strlen(conf->tag); if (len > MAX_TAG_LEN - 1) { fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1); exit(1); } s->tag = strdup(conf->tag); s->ctx.uid = -1; s->ops = fse->ops; s->vdev.get_features = virtio_9p_get_features; s->config_size = sizeof(struct virtio_9p_config) + len; s->vdev.get_config = virtio_9p_get_config; s->fid_list = NULL; qemu_co_rwlock_init(&s->rename_lock); if (s->ops->init(&s->ctx) < 0) { fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" " and export path:%s\n", conf->fsdev_id, s->ctx.fs_root); exit(1); } if (v9fs_init_worker_threads() < 0) { fprintf(stderr, "worker thread initialization failed\n"); exit(1); } /* * Check details of export path, We need to use fs driver * call back to do that. Since we are in the init path, we don't * use co-routines here. */ v9fs_path_init(&path); if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { fprintf(stderr, "error in converting name to path %s", strerror(errno)); exit(1); } if (s->ops->lstat(&s->ctx, &path, &stat)) { fprintf(stderr, "share path %s does not exist\n", fse->path); exit(1); } else if (!S_ISDIR(stat.st_mode)) { fprintf(stderr, "share path %s is not a directory\n", fse->path); exit(1); } v9fs_path_free(&path); return &s->vdev; } static int virtio_9p_init_pci(PCIDevice *pci_dev) { VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); VirtIODevice *vdev; vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); vdev->nvectors = proxy->nvectors; virtio_init_pci(proxy, vdev); /* make the actual value visible */ proxy->nvectors = vdev->nvectors; return 0; } static PCIDeviceInfo virtio_9p_info = { .qdev.name = "virtio-9p-pci", .qdev.size = sizeof(VirtIOPCIProxy), .init = virtio_9p_init_pci, .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET, .device_id = 0x1009, .revision = VIRTIO_PCI_ABI_VERSION, .class_id = 0x2, .qdev.props = (Property[]) { DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag), DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id), DEFINE_PROP_END_OF_LIST(), }, .qdev.reset = virtio_pci_reset, }; static void virtio_9p_register_devices(void) { pci_qdev_register(&virtio_9p_info); virtio_9p_set_fd_limit(); } device_init(virtio_9p_register_devices)