1 /* 2 * Vhost-user vsock virtio device 3 * 4 * Copyright 2020 Red Hat, Inc. 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or 7 * (at your option) any later version. See the COPYING file in the 8 * top-level directory. 9 */ 10 11 #include "qemu/osdep.h" 12 13 #include "qapi/error.h" 14 #include "qemu/error-report.h" 15 #include "hw/qdev-properties.h" 16 #include "hw/qdev-properties-system.h" 17 #include "hw/virtio/vhost-user-vsock.h" 18 19 static const int user_feature_bits[] = { 20 VIRTIO_F_VERSION_1, 21 VIRTIO_RING_F_INDIRECT_DESC, 22 VIRTIO_RING_F_EVENT_IDX, 23 VIRTIO_F_NOTIFY_ON_EMPTY, 24 VHOST_INVALID_FEATURE_BIT 25 }; 26 27 static void vuv_get_config(VirtIODevice *vdev, uint8_t *config) 28 { 29 VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev); 30 31 memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config)); 32 } 33 34 static int vuv_handle_config_change(struct vhost_dev *dev) 35 { 36 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev); 37 Error *local_err = NULL; 38 int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg, 39 sizeof(struct virtio_vsock_config), 40 &local_err); 41 if (ret < 0) { 42 error_report_err(local_err); 43 return -1; 44 } 45 46 virtio_notify_config(dev->vdev); 47 48 return 0; 49 } 50 51 const VhostDevConfigOps vsock_ops = { 52 .vhost_dev_config_notifier = vuv_handle_config_change, 53 }; 54 55 static void vuv_set_status(VirtIODevice *vdev, uint8_t status) 56 { 57 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); 58 bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK; 59 60 if (!vdev->vm_running) { 61 should_start = false; 62 } 63 64 if (vvc->vhost_dev.started == should_start) { 65 return; 66 } 67 68 if (should_start) { 69 int ret = vhost_vsock_common_start(vdev); 70 if (ret < 0) { 71 return; 72 } 73 } else { 74 vhost_vsock_common_stop(vdev); 75 } 76 } 77 78 static uint64_t vuv_get_features(VirtIODevice *vdev, 79 uint64_t features, 80 Error **errp) 81 { 82 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); 83 84 features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features); 85 86 return vhost_vsock_common_get_features(vdev, features, errp); 87 } 88 89 static const VMStateDescription vuv_vmstate = { 90 .name = "vhost-user-vsock", 91 .unmigratable = 1, 92 }; 93 94 static void vuv_device_realize(DeviceState *dev, Error **errp) 95 { 96 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); 97 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 98 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev); 99 int ret; 100 101 if (!vsock->conf.chardev.chr) { 102 error_setg(errp, "missing chardev"); 103 return; 104 } 105 106 if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) { 107 return; 108 } 109 110 vhost_vsock_common_realize(vdev, "vhost-user-vsock"); 111 112 vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops); 113 114 ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user, 115 VHOST_BACKEND_TYPE_USER, 0, errp); 116 if (ret < 0) { 117 goto err_virtio; 118 } 119 120 ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg, 121 sizeof(struct virtio_vsock_config), errp); 122 if (ret < 0) { 123 goto err_vhost_dev; 124 } 125 126 return; 127 128 err_vhost_dev: 129 vhost_dev_cleanup(&vvc->vhost_dev); 130 err_virtio: 131 vhost_vsock_common_unrealize(vdev); 132 vhost_user_cleanup(&vsock->vhost_user); 133 return; 134 } 135 136 static void vuv_device_unrealize(DeviceState *dev) 137 { 138 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); 139 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 140 VHostUserVSock *vsock = VHOST_USER_VSOCK(dev); 141 142 /* This will stop vhost backend if appropriate. */ 143 vuv_set_status(vdev, 0); 144 145 vhost_dev_cleanup(&vvc->vhost_dev); 146 147 vhost_vsock_common_unrealize(vdev); 148 149 vhost_user_cleanup(&vsock->vhost_user); 150 151 } 152 153 static Property vuv_properties[] = { 154 DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev), 155 DEFINE_PROP_END_OF_LIST(), 156 }; 157 158 static void vuv_class_init(ObjectClass *klass, void *data) 159 { 160 DeviceClass *dc = DEVICE_CLASS(klass); 161 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 162 163 device_class_set_props(dc, vuv_properties); 164 dc->vmsd = &vuv_vmstate; 165 vdc->realize = vuv_device_realize; 166 vdc->unrealize = vuv_device_unrealize; 167 vdc->get_features = vuv_get_features; 168 vdc->get_config = vuv_get_config; 169 vdc->set_status = vuv_set_status; 170 } 171 172 static const TypeInfo vuv_info = { 173 .name = TYPE_VHOST_USER_VSOCK, 174 .parent = TYPE_VHOST_VSOCK_COMMON, 175 .instance_size = sizeof(VHostUserVSock), 176 .class_init = vuv_class_init, 177 }; 178 179 static void vuv_register_types(void) 180 { 181 type_register_static(&vuv_info); 182 } 183 184 type_init(vuv_register_types) 185