| 1 | /* |
| 2 | * Virtio vsock device |
| 3 | * |
| 4 | * Copyright 2015 Red Hat, Inc. |
| 5 | * |
| 6 | * Authors: |
| 7 | * Stefan Hajnoczi <stefanha@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or |
| 10 | * (at your option) any later version. See the COPYING file in the |
| 11 | * top-level directory. |
| 12 | */ |
| 13 | |
| 14 | #include "qemu/osdep.h" |
| 15 | #include "standard-headers/linux/virtio_vsock.h" |
| 16 | #include "qapi/error.h" |
| 17 | #include "hw/virtio/virtio-access.h" |
| 18 | #include "qemu/error-report.h" |
| 19 | #include "qemu/sockets.h" |
| 20 | #include "hw/core/qdev-properties.h" |
| 21 | #include "hw/virtio/vhost-vsock.h" |
| 22 | #include "monitor/monitor.h" |
| 23 | |
| 24 | static void vhost_vsock_get_config(VirtIODevice *vdev, uint8_t *config) |
| 25 | { |
| 26 | VHostVSock *vsock = VHOST_VSOCK(vdev); |
| 27 | struct virtio_vsock_config vsockcfg = {}; |
| 28 | |
| 29 | virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid); |
| 30 | memcpy(config, &vsockcfg, sizeof(vsockcfg)); |
| 31 | } |
| 32 | |
| 33 | static int vhost_vsock_set_guest_cid(VirtIODevice *vdev) |
| 34 | { |
| 35 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); |
| 36 | VHostVSock *vsock = VHOST_VSOCK(vdev); |
| 37 | const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops; |
| 38 | int ret; |
| 39 | |
| 40 | if (!vhost_ops->vhost_vsock_set_guest_cid) { |
| 41 | return -ENOSYS; |
| 42 | } |
| 43 | |
| 44 | ret = vhost_ops->vhost_vsock_set_guest_cid(&vvc->vhost_dev, |
| 45 | vsock->conf.guest_cid); |
| 46 | if (ret < 0) { |
| 47 | return -errno; |
| 48 | } |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | static int vhost_vsock_set_running(VirtIODevice *vdev, int start) |
| 53 | { |
| 54 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); |
| 55 | const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops; |
| 56 | int ret; |
| 57 | |
| 58 | if (!vhost_ops->vhost_vsock_set_running) { |
| 59 | return -ENOSYS; |
| 60 | } |
| 61 | |
| 62 | ret = vhost_ops->vhost_vsock_set_running(&vvc->vhost_dev, start); |
| 63 | if (ret < 0) { |
| 64 | return -errno; |
| 65 | } |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | |
| 70 | static int vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status) |
| 71 | { |
| 72 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); |
| 73 | bool should_start = virtio_device_should_start(vdev, status); |
| 74 | int ret; |
| 75 | |
| 76 | if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) { |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | if (should_start) { |
| 81 | ret = vhost_vsock_common_start(vdev); |
| 82 | if (ret < 0) { |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | ret = vhost_vsock_set_running(vdev, 1); |
| 87 | if (ret < 0) { |
| 88 | vhost_vsock_common_stop(vdev); |
| 89 | error_report("Error starting vhost vsock: %d", -ret); |
| 90 | return 0; |
| 91 | } |
| 92 | } else { |
| 93 | ret = vhost_vsock_set_running(vdev, 0); |
| 94 | if (ret < 0) { |
| 95 | error_report("vhost vsock set running failed: %d", ret); |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | vhost_vsock_common_stop(vdev); |
| 100 | } |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static uint64_t vhost_vsock_get_features(VirtIODevice *vdev, |
| 105 | uint64_t requested_features, |
| 106 | Error **errp) |
| 107 | { |
| 108 | return vhost_vsock_common_get_features(vdev, requested_features, errp); |
| 109 | } |
| 110 | |
| 111 | static const VMStateDescription vmstate_virtio_vhost_vsock = { |
| 112 | .name = "virtio-vhost_vsock", |
| 113 | .minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION, |
| 114 | .version_id = VHOST_VSOCK_SAVEVM_VERSION, |
| 115 | .fields = (const VMStateField[]) { |
| 116 | VMSTATE_VIRTIO_DEVICE, |
| 117 | VMSTATE_END_OF_LIST() |
| 118 | }, |
| 119 | .pre_save = vhost_vsock_common_pre_save, |
| 120 | .post_load = vhost_vsock_common_post_load, |
| 121 | }; |
| 122 | |
| 123 | static void vhost_vsock_device_realize(DeviceState *dev, Error **errp) |
| 124 | { |
| 125 | ERRP_GUARD(); |
| 126 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); |
| 127 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 128 | VHostVSock *vsock = VHOST_VSOCK(dev); |
| 129 | int vhostfd; |
| 130 | int ret; |
| 131 | |
| 132 | /* Refuse to use reserved CID numbers */ |
| 133 | if (vsock->conf.guest_cid <= 2) { |
| 134 | error_setg(errp, "guest-cid property must be greater than 2"); |
| 135 | return; |
| 136 | } |
| 137 | |
| 138 | if (vsock->conf.guest_cid > UINT32_MAX) { |
| 139 | error_setg(errp, "guest-cid property must be a 32-bit number"); |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | if (vsock->conf.vhostfd) { |
| 144 | vhostfd = monitor_fd_param(monitor_cur(), vsock->conf.vhostfd, errp); |
| 145 | if (vhostfd == -1) { |
| 146 | error_prepend(errp, "vhost-vsock: unable to parse vhostfd: "); |
| 147 | return; |
| 148 | } |
| 149 | |
| 150 | if (!qemu_set_blocking(vhostfd, false, errp)) { |
| 151 | return; |
| 152 | } |
| 153 | } else { |
| 154 | vhostfd = open("/dev/vhost-vsock", O_RDWR); |
| 155 | if (vhostfd < 0) { |
| 156 | error_setg_file_open(errp, errno, "/dev/vhost-vsock"); |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | if (!qemu_set_blocking(vhostfd, false, errp)) { |
| 161 | return; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | vhost_vsock_common_realize(vdev); |
| 166 | |
| 167 | ret = vhost_dev_init(&vvc->vhost_dev, (void *)(uintptr_t)vhostfd, |
| 168 | VHOST_BACKEND_TYPE_KERNEL, 0, errp); |
| 169 | if (ret < 0) { |
| 170 | /* |
| 171 | * vhostfd is closed by vhost_dev_cleanup, which is called |
| 172 | * by vhost_dev_init on initialization error. |
| 173 | */ |
| 174 | goto err_virtio; |
| 175 | } |
| 176 | |
| 177 | ret = vhost_vsock_set_guest_cid(vdev); |
| 178 | if (ret < 0) { |
| 179 | error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid"); |
| 180 | goto err_vhost_dev; |
| 181 | } |
| 182 | |
| 183 | return; |
| 184 | |
| 185 | err_vhost_dev: |
| 186 | /* vhost_dev_cleanup() closes the vhostfd passed to vhost_dev_init() */ |
| 187 | vhost_dev_cleanup(&vvc->vhost_dev); |
| 188 | err_virtio: |
| 189 | vhost_vsock_common_unrealize(vdev); |
| 190 | } |
| 191 | |
| 192 | static void vhost_vsock_device_unrealize(DeviceState *dev) |
| 193 | { |
| 194 | VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); |
| 195 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 196 | |
| 197 | /* This will stop vhost backend if appropriate. */ |
| 198 | vhost_vsock_set_status(vdev, 0); |
| 199 | |
| 200 | vhost_dev_cleanup(&vvc->vhost_dev); |
| 201 | vhost_vsock_common_unrealize(vdev); |
| 202 | } |
| 203 | |
| 204 | static const Property vhost_vsock_properties[] = { |
| 205 | DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0), |
| 206 | DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd), |
| 207 | }; |
| 208 | |
| 209 | static void vhost_vsock_class_init(ObjectClass *klass, const void *data) |
| 210 | { |
| 211 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 212 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| 213 | |
| 214 | device_class_set_props(dc, vhost_vsock_properties); |
| 215 | dc->vmsd = &vmstate_virtio_vhost_vsock; |
| 216 | vdc->realize = vhost_vsock_device_realize; |
| 217 | vdc->unrealize = vhost_vsock_device_unrealize; |
| 218 | vdc->get_features = vhost_vsock_get_features; |
| 219 | vdc->get_config = vhost_vsock_get_config; |
| 220 | vdc->set_status = vhost_vsock_set_status; |
| 221 | } |
| 222 | |
| 223 | static const TypeInfo vhost_vsock_info = { |
| 224 | .name = TYPE_VHOST_VSOCK, |
| 225 | .parent = TYPE_VHOST_VSOCK_COMMON, |
| 226 | .instance_size = sizeof(VHostVSock), |
| 227 | .class_init = vhost_vsock_class_init, |
| 228 | }; |
| 229 | |
| 230 | static void vhost_vsock_register_types(void) |
| 231 | { |
| 232 | type_register_static(&vhost_vsock_info); |
| 233 | } |
| 234 | |
| 235 | type_init(vhost_vsock_register_types) |