hw/9pfs/virtio-9p-device.c

   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     for (i = 0; i < (MAX_REQ - 1); i++) {
  62         QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
  63     }
  64
  65     s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
  66
  67     fse = get_fsdev_fsentry(conf->fsdev_id);
  68
  69     if (!fse) {
  70         /* We don't have a fsdev identified by fsdev_id */
  71         fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
  72                 "id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL");
  73         exit(1);
  74     }
  75
  76     if (!fse->path || !conf->tag) {
  77         /* we haven't specified a mount_tag or the path */
  78         fprintf(stderr, "fsdev with id %s needs path "
  79                 "and Virtio-9p device needs mount_tag arguments\n",
  80                 conf->fsdev_id);
  81         exit(1);
  82     }
  83
  84     if (!strcmp(fse->security_model, "passthrough")) {
  85         /* Files on the Fileserver set to client user credentials */
  86         s->ctx.fs_sm = SM_PASSTHROUGH;
  87         s->ctx.xops = passthrough_xattr_ops;
  88     } else if (!strcmp(fse->security_model, "mapped")) {
  89         /* Files on the fileserver are set to QEMU credentials.
  90          * Client user credentials are saved in extended attributes.
  91          */
  92         s->ctx.fs_sm = SM_MAPPED;
  93         s->ctx.xops = mapped_xattr_ops;
  94     } else if (!strcmp(fse->security_model, "none")) {
  95         /*
  96          * Files on the fileserver are set to QEMU credentials.
  97          */
  98         s->ctx.fs_sm = SM_NONE;
  99         s->ctx.xops = none_xattr_ops;
 100     } else {
 101         fprintf(stderr, "Default to security_model=none. You may want"
 102                 " enable advanced security model using "
 103                 "security option:\n\t security_model=passthrough\n\t "
 104                 "security_model=mapped\n");
 105         s->ctx.fs_sm = SM_NONE;
 106         s->ctx.xops = none_xattr_ops;
 107     }
 108
 109     if (lstat(fse->path, &stat)) {
 110         fprintf(stderr, "share path %s does not exist\n", fse->path);
 111         exit(1);
 112     } else if (!S_ISDIR(stat.st_mode)) {
 113         fprintf(stderr, "share path %s is not a directory\n", fse->path);
 114         exit(1);
 115     }
 116
 117     s->ctx.fs_root = g_strdup(fse->path);
 118     len = strlen(conf->tag);
 119     if (len > MAX_TAG_LEN) {
 120         len = MAX_TAG_LEN;
 121     }
 122     /* s->tag is non-NULL terminated string */
 123     s->tag = g_malloc(len);
 124     memcpy(s->tag, conf->tag, len);
 125     s->tag_len = len;
 126     s->ctx.uid = -1;
 127
 128     s->ops = fse->ops;
 129     s->vdev.get_features = virtio_9p_get_features;
 130     s->config_size = sizeof(struct virtio_9p_config) +
 131                         s->tag_len;
 132     s->vdev.get_config = virtio_9p_get_config;
 133     s->fid_list = NULL;
 134     qemu_co_rwlock_init(&s->rename_lock);
 135
 136     if (v9fs_init_worker_threads() < 0) {
 137         fprintf(stderr, "worker thread initialization failed\n");
 138         exit(1);
 139     }
 140     return &s->vdev;
 141 }
 142
 143 static int virtio_9p_init_pci(PCIDevice *pci_dev)
 144 {
 145     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 146     VirtIODevice *vdev;
 147
 148     vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf);
 149     vdev->nvectors = proxy->nvectors;
 150     virtio_init_pci(proxy, vdev);
 151     /* make the actual value visible */
 152     proxy->nvectors = vdev->nvectors;
 153     return 0;
 154 }
 155
 156 static PCIDeviceInfo virtio_9p_info = {
 157     .qdev.name = "virtio-9p-pci",
 158     .qdev.size = sizeof(VirtIOPCIProxy),
 159     .init      = virtio_9p_init_pci,
 160     .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
 161     .device_id = 0x1009,
 162     .revision  = VIRTIO_PCI_ABI_VERSION,
 163     .class_id  = 0x2,
 164     .qdev.props = (Property[]) {
 165         DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 166         DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 167         DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
 168         DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
 169         DEFINE_PROP_END_OF_LIST(),
 170     }
 171 };
 172
 173 static void virtio_9p_register_devices(void)
 174 {
 175     pci_qdev_register(&virtio_9p_info);
 176     virtio_9p_set_fd_limit();
 177 }
 178
 179 device_init(virtio_9p_register_devices)