1 /* 2 * vhost-user-scsi host device 3 * 4 * Copyright (c) 2016 Nutanix Inc. All rights reserved. 5 * 6 * Author: 7 * Felipe Franciosi <felipe@nutanix.com> 8 * 9 * This work is largely based on the "vhost-scsi" implementation by: 10 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 11 * Nicholas Bellinger <nab@risingtidesystems.com> 12 * 13 * This work is licensed under the terms of the GNU LGPL, version 2 or later. 14 * See the COPYING.LIB file in the top-level directory. 15 * 16 */ 17 18 #include "qemu/osdep.h" 19 #include "qapi/error.h" 20 #include "qemu/error-report.h" 21 #include "hw/fw-path-provider.h" 22 #include "hw/qdev-core.h" 23 #include "hw/qdev-properties.h" 24 #include "hw/virtio/vhost.h" 25 #include "hw/virtio/vhost-backend.h" 26 #include "hw/virtio/vhost-user-scsi.h" 27 #include "hw/virtio/virtio.h" 28 #include "hw/virtio/virtio-access.h" 29 #include "chardev/char-fe.h" 30 #include "sysemu/sysemu.h" 31 32 /* Features supported by the host application */ 33 static const int user_feature_bits[] = { 34 VIRTIO_F_NOTIFY_ON_EMPTY, 35 VIRTIO_RING_F_INDIRECT_DESC, 36 VIRTIO_RING_F_EVENT_IDX, 37 VIRTIO_SCSI_F_HOTPLUG, 38 VHOST_INVALID_FEATURE_BIT 39 }; 40 41 enum VhostUserProtocolFeature { 42 VHOST_USER_PROTOCOL_F_RESET_DEVICE = 13, 43 }; 44 45 static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status) 46 { 47 VHostUserSCSI *s = (VHostUserSCSI *)vdev; 48 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); 49 bool start = (status & VIRTIO_CONFIG_S_DRIVER_OK) && vdev->vm_running; 50 51 if (vsc->dev.started == start) { 52 return; 53 } 54 55 if (start) { 56 int ret; 57 58 ret = vhost_scsi_common_start(vsc); 59 if (ret < 0) { 60 error_report("unable to start vhost-user-scsi: %s", strerror(-ret)); 61 exit(1); 62 } 63 } else { 64 vhost_scsi_common_stop(vsc); 65 } 66 } 67 68 static void vhost_user_scsi_reset(VirtIODevice *vdev) 69 { 70 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); 71 struct vhost_dev *dev = &vsc->dev; 72 73 /* 74 * Historically, reset was not implemented so only reset devices 75 * that are expecting it. 76 */ 77 if (!virtio_has_feature(dev->protocol_features, 78 VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { 79 return; 80 } 81 82 if (dev->vhost_ops->vhost_reset_device) { 83 dev->vhost_ops->vhost_reset_device(dev); 84 } 85 } 86 87 static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) 88 { 89 } 90 91 static void vhost_user_scsi_realize(DeviceState *dev, Error **errp) 92 { 93 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); 94 VHostUserSCSI *s = VHOST_USER_SCSI(dev); 95 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); 96 struct vhost_virtqueue *vqs = NULL; 97 Error *err = NULL; 98 int ret; 99 100 if (!vs->conf.chardev.chr) { 101 error_setg(errp, "vhost-user-scsi: missing chardev"); 102 return; 103 } 104 105 virtio_scsi_common_realize(dev, vhost_dummy_handle_output, 106 vhost_dummy_handle_output, 107 vhost_dummy_handle_output, &err); 108 if (err != NULL) { 109 error_propagate(errp, err); 110 return; 111 } 112 113 if (!vhost_user_init(&s->vhost_user, &vs->conf.chardev, errp)) { 114 goto free_virtio; 115 } 116 117 vsc->dev.nvqs = VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; 118 vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); 119 vsc->dev.vq_index = 0; 120 vsc->dev.backend_features = 0; 121 vqs = vsc->dev.vqs; 122 123 ret = vhost_dev_init(&vsc->dev, &s->vhost_user, 124 VHOST_BACKEND_TYPE_USER, 0); 125 if (ret < 0) { 126 error_setg(errp, "vhost-user-scsi: vhost initialization failed: %s", 127 strerror(-ret)); 128 goto free_vhost; 129 } 130 131 /* Channel and lun both are 0 for bootable vhost-user-scsi disk */ 132 vsc->channel = 0; 133 vsc->lun = 0; 134 vsc->target = vs->conf.boot_tpgt; 135 136 return; 137 138 free_vhost: 139 vhost_user_cleanup(&s->vhost_user); 140 g_free(vqs); 141 free_virtio: 142 virtio_scsi_common_unrealize(dev); 143 } 144 145 static void vhost_user_scsi_unrealize(DeviceState *dev) 146 { 147 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 148 VHostUserSCSI *s = VHOST_USER_SCSI(dev); 149 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); 150 struct vhost_virtqueue *vqs = vsc->dev.vqs; 151 152 /* This will stop the vhost backend. */ 153 vhost_user_scsi_set_status(vdev, 0); 154 155 vhost_dev_cleanup(&vsc->dev); 156 g_free(vqs); 157 158 virtio_scsi_common_unrealize(dev); 159 vhost_user_cleanup(&s->vhost_user); 160 } 161 162 static Property vhost_user_scsi_properties[] = { 163 DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev), 164 DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0), 165 DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 166 VIRTIO_SCSI_AUTO_NUM_QUEUES), 167 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size, 168 128), 169 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors, 170 0xFFFF), 171 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128), 172 DEFINE_PROP_BIT64("hotplug", VHostSCSICommon, host_features, 173 VIRTIO_SCSI_F_HOTPLUG, 174 true), 175 DEFINE_PROP_BIT64("param_change", VHostSCSICommon, host_features, 176 VIRTIO_SCSI_F_CHANGE, 177 true), 178 DEFINE_PROP_BIT64("t10_pi", VHostSCSICommon, host_features, 179 VIRTIO_SCSI_F_T10_PI, 180 false), 181 DEFINE_PROP_END_OF_LIST(), 182 }; 183 184 static const VMStateDescription vmstate_vhost_scsi = { 185 .name = "virtio-scsi", 186 .minimum_version_id = 1, 187 .version_id = 1, 188 .fields = (VMStateField[]) { 189 VMSTATE_VIRTIO_DEVICE, 190 VMSTATE_END_OF_LIST() 191 }, 192 }; 193 194 static void vhost_user_scsi_class_init(ObjectClass *klass, void *data) 195 { 196 DeviceClass *dc = DEVICE_CLASS(klass); 197 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 198 FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass); 199 200 device_class_set_props(dc, vhost_user_scsi_properties); 201 dc->vmsd = &vmstate_vhost_scsi; 202 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 203 vdc->realize = vhost_user_scsi_realize; 204 vdc->unrealize = vhost_user_scsi_unrealize; 205 vdc->get_features = vhost_scsi_common_get_features; 206 vdc->set_config = vhost_scsi_common_set_config; 207 vdc->set_status = vhost_user_scsi_set_status; 208 vdc->reset = vhost_user_scsi_reset; 209 fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path; 210 } 211 212 static void vhost_user_scsi_instance_init(Object *obj) 213 { 214 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj); 215 216 vsc->feature_bits = user_feature_bits; 217 218 /* Add the bootindex property for this object */ 219 device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL, 220 DEVICE(vsc)); 221 } 222 223 static const TypeInfo vhost_user_scsi_info = { 224 .name = TYPE_VHOST_USER_SCSI, 225 .parent = TYPE_VHOST_SCSI_COMMON, 226 .instance_size = sizeof(VHostUserSCSI), 227 .class_init = vhost_user_scsi_class_init, 228 .instance_init = vhost_user_scsi_instance_init, 229 .interfaces = (InterfaceInfo[]) { 230 { TYPE_FW_PATH_PROVIDER }, 231 { } 232 }, 233 }; 234 235 static void virtio_register_types(void) 236 { 237 type_register_static(&vhost_user_scsi_info); 238 } 239 240 type_init(virtio_register_types) 241