1 /* 2 * Virtio 9p backend 3 * 4 * Copyright IBM, Corp. 2010 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "hw/virtio.h" 15 #include "hw/pc.h" 16 #include "qemu_socket.h" 17 #include "hw/virtio-pci.h" 18 #include "virtio-9p.h" 19 #include "fsdev/qemu-fsdev.h" 20 #include "virtio-9p-xattr.h" 21 #include "virtio-9p-coth.h" 22 23 static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) 24 { 25 features |= 1 << VIRTIO_9P_MOUNT_TAG; 26 return features; 27 } 28 29 static V9fsState *to_virtio_9p(VirtIODevice *vdev) 30 { 31 return (V9fsState *)vdev; 32 } 33 34 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) 35 { 36 struct virtio_9p_config *cfg; 37 V9fsState *s = to_virtio_9p(vdev); 38 39 cfg = g_malloc0(sizeof(struct virtio_9p_config) + 40 s->tag_len); 41 stw_raw(&cfg->tag_len, s->tag_len); 42 memcpy(cfg->tag, s->tag, s->tag_len); 43 memcpy(config, cfg, s->config_size); 44 g_free(cfg); 45 } 46 47 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) 48 { 49 V9fsState *s; 50 int i, len; 51 struct stat stat; 52 FsTypeEntry *fse; 53 54 s = (V9fsState *)virtio_common_init("virtio-9p", 55 VIRTIO_ID_9P, 56 sizeof(struct virtio_9p_config)+ 57 MAX_TAG_LEN, 58 sizeof(V9fsState)); 59 /* initialize pdu allocator */ 60 QLIST_INIT(&s->free_list); 61 QLIST_INIT(&s->active_list); 62 for (i = 0; i < (MAX_REQ - 1); i++) { 63 QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); 64 } 65 66 s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); 67 68 fse = get_fsdev_fsentry(conf->fsdev_id); 69 70 if (!fse) { 71 /* We don't have a fsdev identified by fsdev_id */ 72 fprintf(stderr, "Virtio-9p device couldn't find fsdev with the " 73 "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL"); 74 exit(1); 75 } 76 77 if (!fse->path || !conf->tag) { 78 /* we haven't specified a mount_tag or the path */ 79 fprintf(stderr, "fsdev with id %s needs path " 80 "and Virtio-9p device needs mount_tag arguments\n", 81 conf->fsdev_id); 82 exit(1); 83 } 84 85 if (!strcmp(fse->security_model, "passthrough")) { 86 /* Files on the Fileserver set to client user credentials */ 87 s->ctx.fs_sm = SM_PASSTHROUGH; 88 s->ctx.xops = passthrough_xattr_ops; 89 } else if (!strcmp(fse->security_model, "mapped")) { 90 /* Files on the fileserver are set to QEMU credentials. 91 * Client user credentials are saved in extended attributes. 92 */ 93 s->ctx.fs_sm = SM_MAPPED; 94 s->ctx.xops = mapped_xattr_ops; 95 } else if (!strcmp(fse->security_model, "none")) { 96 /* 97 * Files on the fileserver are set to QEMU credentials. 98 */ 99 s->ctx.fs_sm = SM_NONE; 100 s->ctx.xops = none_xattr_ops; 101 } else { 102 fprintf(stderr, "Default to security_model=none. You may want" 103 " enable advanced security model using " 104 "security option:\n\t security_model=passthrough\n\t " 105 "security_model=mapped\n"); 106 s->ctx.fs_sm = SM_NONE; 107 s->ctx.xops = none_xattr_ops; 108 } 109 110 if (lstat(fse->path, &stat)) { 111 fprintf(stderr, "share path %s does not exist\n", fse->path); 112 exit(1); 113 } else if (!S_ISDIR(stat.st_mode)) { 114 fprintf(stderr, "share path %s is not a directory\n", fse->path); 115 exit(1); 116 } 117 118 s->ctx.export_flags = fse->export_flags; 119 s->ctx.fs_root = g_strdup(fse->path); 120 s->ctx.exops.get_st_gen = NULL; 121 122 len = strlen(conf->tag); 123 if (len > MAX_TAG_LEN) { 124 fprintf(stderr, "mount tag '%s' (%d bytes) is longer than " 125 "maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN); 126 exit(1); 127 } 128 /* s->tag is non-NULL terminated string */ 129 s->tag = g_malloc(len); 130 memcpy(s->tag, conf->tag, len); 131 s->tag_len = len; 132 s->ctx.uid = -1; 133 s->ctx.flags = 0; 134 135 s->ops = fse->ops; 136 s->vdev.get_features = virtio_9p_get_features; 137 s->config_size = sizeof(struct virtio_9p_config) + 138 s->tag_len; 139 s->vdev.get_config = virtio_9p_get_config; 140 s->fid_list = NULL; 141 qemu_co_rwlock_init(&s->rename_lock); 142 143 if (s->ops->init(&s->ctx) < 0) { 144 fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s" 145 " and export path:%s\n", conf->fsdev_id, s->ctx.fs_root); 146 exit(1); 147 } 148 if (v9fs_init_worker_threads() < 0) { 149 fprintf(stderr, "worker thread initialization failed\n"); 150 exit(1); 151 } 152 return &s->vdev; 153 } 154 155 static int virtio_9p_init_pci(PCIDevice *pci_dev) 156 { 157 VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); 158 VirtIODevice *vdev; 159 160 vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); 161 vdev->nvectors = proxy->nvectors; 162 virtio_init_pci(proxy, vdev); 163 /* make the actual value visible */ 164 proxy->nvectors = vdev->nvectors; 165 return 0; 166 } 167 168 static PCIDeviceInfo virtio_9p_info = { 169 .qdev.name = "virtio-9p-pci", 170 .qdev.size = sizeof(VirtIOPCIProxy), 171 .init = virtio_9p_init_pci, 172 .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET, 173 .device_id = 0x1009, 174 .revision = VIRTIO_PCI_ABI_VERSION, 175 .class_id = 0x2, 176 .qdev.props = (Property[]) { 177 DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, 178 VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), 179 DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), 180 DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), 181 DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag), 182 DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id), 183 DEFINE_PROP_END_OF_LIST(), 184 } 185 }; 186 187 static void virtio_9p_register_devices(void) 188 { 189 pci_qdev_register(&virtio_9p_info); 190 virtio_9p_set_fd_limit(); 191 } 192 193 device_init(virtio_9p_register_devices) 194