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 22 static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) 23 { 24 features |= 1 << VIRTIO_9P_MOUNT_TAG; 25 return features; 26 } 27 28 static V9fsState *to_virtio_9p(VirtIODevice *vdev) 29 { 30 return (V9fsState *)vdev; 31 } 32 33 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) 34 { 35 struct virtio_9p_config *cfg; 36 V9fsState *s = to_virtio_9p(vdev); 37 38 cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + 39 s->tag_len); 40 stw_raw(&cfg->tag_len, s->tag_len); 41 memcpy(cfg->tag, s->tag, s->tag_len); 42 memcpy(config, cfg, s->config_size); 43 qemu_free(cfg); 44 } 45 46 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) 47 { 48 V9fsState *s; 49 int i, len; 50 struct stat stat; 51 FsTypeEntry *fse; 52 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 60 /* initialize pdu allocator */ 61 QLIST_INIT(&s->free_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.fs_root = qemu_strdup(fse->path); 119 len = strlen(conf->tag); 120 if (len > MAX_TAG_LEN) { 121 len = MAX_TAG_LEN; 122 } 123 /* s->tag is non-NULL terminated string */ 124 s->tag = qemu_malloc(len); 125 memcpy(s->tag, conf->tag, len); 126 s->tag_len = len; 127 s->ctx.uid = -1; 128 129 s->ops = fse->ops; 130 s->vdev.get_features = virtio_9p_get_features; 131 s->config_size = sizeof(struct virtio_9p_config) + 132 s->tag_len; 133 s->vdev.get_config = virtio_9p_get_config; 134 135 return &s->vdev; 136 } 137 138 static int virtio_9p_init_pci(PCIDevice *pci_dev) 139 { 140 VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); 141 VirtIODevice *vdev; 142 143 vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); 144 vdev->nvectors = proxy->nvectors; 145 virtio_init_pci(proxy, vdev, 146 PCI_VENDOR_ID_REDHAT_QUMRANET, 147 0x1009, 148 0x2, 149 0x00); 150 /* make the actual value visible */ 151 proxy->nvectors = vdev->nvectors; 152 return 0; 153 } 154 155 static PCIDeviceInfo virtio_9p_info = { 156 .qdev.name = "virtio-9p-pci", 157 .qdev.size = sizeof(VirtIOPCIProxy), 158 .init = virtio_9p_init_pci, 159 .qdev.props = (Property[]) { 160 DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), 161 DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), 162 DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag), 163 DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id), 164 DEFINE_PROP_END_OF_LIST(), 165 } 166 }; 167 168 static void virtio_9p_register_devices(void) 169 { 170 pci_qdev_register(&virtio_9p_info); 171 } 172 173 device_init(virtio_9p_register_devices) 174