| /* |
| * vhost-user-scsi host device |
| * |
| * Copyright (c) 2016 Nutanix Inc. All rights reserved. |
| * |
| * Author: |
| * Felipe Franciosi <felipe@nutanix.com> |
| * |
| * This work is largely based on the "vhost-scsi" implementation by: |
| * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
| * Nicholas Bellinger <nab@risingtidesystems.com> |
| * |
| * This work is licensed under the terms of the GNU LGPL, version 2 or later. |
| * See the COPYING.LIB file in the top-level directory. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qemu/error-report.h" |
| #include "hw/fw-path-provider.h" |
| #include "hw/qdev-core.h" |
| #include "hw/qdev-properties.h" |
| #include "hw/qdev-properties-system.h" |
| #include "hw/virtio/vhost.h" |
| #include "hw/virtio/vhost-backend.h" |
| #include "hw/virtio/vhost-user-scsi.h" |
| #include "hw/virtio/virtio.h" |
| #include "hw/virtio/virtio-access.h" |
| #include "chardev/char-fe.h" |
| #include "sysemu/sysemu.h" |
| |
| /* Features supported by the host application */ |
| static const int user_feature_bits[] = { |
| VIRTIO_F_NOTIFY_ON_EMPTY, |
| VIRTIO_RING_F_INDIRECT_DESC, |
| VIRTIO_RING_F_EVENT_IDX, |
| VIRTIO_SCSI_F_HOTPLUG, |
| VHOST_INVALID_FEATURE_BIT |
| }; |
| |
| enum VhostUserProtocolFeature { |
| VHOST_USER_PROTOCOL_F_RESET_DEVICE = 13, |
| }; |
| |
| static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status) |
| { |
| VHostUserSCSI *s = (VHostUserSCSI *)vdev; |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| bool start = (status & VIRTIO_CONFIG_S_DRIVER_OK) && vdev->vm_running; |
| |
| if (vsc->dev.started == start) { |
| return; |
| } |
| |
| if (start) { |
| int ret; |
| |
| ret = vhost_scsi_common_start(vsc); |
| if (ret < 0) { |
| error_report("unable to start vhost-user-scsi: %s", strerror(-ret)); |
| exit(1); |
| } |
| } else { |
| vhost_scsi_common_stop(vsc); |
| } |
| } |
| |
| static void vhost_user_scsi_reset(VirtIODevice *vdev) |
| { |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); |
| struct vhost_dev *dev = &vsc->dev; |
| |
| /* |
| * Historically, reset was not implemented so only reset devices |
| * that are expecting it. |
| */ |
| if (!virtio_has_feature(dev->protocol_features, |
| VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { |
| return; |
| } |
| |
| if (dev->vhost_ops->vhost_reset_device) { |
| dev->vhost_ops->vhost_reset_device(dev); |
| } |
| } |
| |
| static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| } |
| |
| static void vhost_user_scsi_realize(DeviceState *dev, Error **errp) |
| { |
| VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); |
| VHostUserSCSI *s = VHOST_USER_SCSI(dev); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| struct vhost_virtqueue *vqs = NULL; |
| Error *err = NULL; |
| int ret; |
| |
| if (!vs->conf.chardev.chr) { |
| error_setg(errp, "vhost-user-scsi: missing chardev"); |
| return; |
| } |
| |
| virtio_scsi_common_realize(dev, vhost_dummy_handle_output, |
| vhost_dummy_handle_output, |
| vhost_dummy_handle_output, &err); |
| if (err != NULL) { |
| error_propagate(errp, err); |
| return; |
| } |
| |
| if (!vhost_user_init(&s->vhost_user, &vs->conf.chardev, errp)) { |
| goto free_virtio; |
| } |
| |
| vsc->dev.nvqs = VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; |
| vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); |
| vsc->dev.vq_index = 0; |
| vsc->dev.backend_features = 0; |
| vqs = vsc->dev.vqs; |
| |
| ret = vhost_dev_init(&vsc->dev, &s->vhost_user, |
| VHOST_BACKEND_TYPE_USER, 0, errp); |
| if (ret < 0) { |
| goto free_vhost; |
| } |
| |
| /* Channel and lun both are 0 for bootable vhost-user-scsi disk */ |
| vsc->channel = 0; |
| vsc->lun = 0; |
| vsc->target = vs->conf.boot_tpgt; |
| |
| return; |
| |
| free_vhost: |
| vhost_user_cleanup(&s->vhost_user); |
| g_free(vqs); |
| free_virtio: |
| virtio_scsi_common_unrealize(dev); |
| } |
| |
| static void vhost_user_scsi_unrealize(DeviceState *dev) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| VHostUserSCSI *s = VHOST_USER_SCSI(dev); |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); |
| struct vhost_virtqueue *vqs = vsc->dev.vqs; |
| |
| /* This will stop the vhost backend. */ |
| vhost_user_scsi_set_status(vdev, 0); |
| |
| vhost_dev_cleanup(&vsc->dev); |
| g_free(vqs); |
| |
| virtio_scsi_common_unrealize(dev); |
| vhost_user_cleanup(&s->vhost_user); |
| } |
| |
| static Property vhost_user_scsi_properties[] = { |
| DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev), |
| DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0), |
| DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, |
| VIRTIO_SCSI_AUTO_NUM_QUEUES), |
| DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size, |
| 128), |
| DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors, |
| 0xFFFF), |
| DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128), |
| DEFINE_PROP_BIT64("hotplug", VHostSCSICommon, host_features, |
| VIRTIO_SCSI_F_HOTPLUG, |
| true), |
| DEFINE_PROP_BIT64("param_change", VHostSCSICommon, host_features, |
| VIRTIO_SCSI_F_CHANGE, |
| true), |
| DEFINE_PROP_BIT64("t10_pi", VHostSCSICommon, host_features, |
| VIRTIO_SCSI_F_T10_PI, |
| false), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static const VMStateDescription vmstate_vhost_scsi = { |
| .name = "virtio-scsi", |
| .minimum_version_id = 1, |
| .version_id = 1, |
| .fields = (VMStateField[]) { |
| VMSTATE_VIRTIO_DEVICE, |
| VMSTATE_END_OF_LIST() |
| }, |
| }; |
| |
| static void vhost_user_scsi_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass); |
| |
| device_class_set_props(dc, vhost_user_scsi_properties); |
| dc->vmsd = &vmstate_vhost_scsi; |
| set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| vdc->realize = vhost_user_scsi_realize; |
| vdc->unrealize = vhost_user_scsi_unrealize; |
| vdc->get_features = vhost_scsi_common_get_features; |
| vdc->set_config = vhost_scsi_common_set_config; |
| vdc->set_status = vhost_user_scsi_set_status; |
| vdc->reset = vhost_user_scsi_reset; |
| fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path; |
| } |
| |
| static void vhost_user_scsi_instance_init(Object *obj) |
| { |
| VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj); |
| |
| vsc->feature_bits = user_feature_bits; |
| |
| /* Add the bootindex property for this object */ |
| device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL, |
| DEVICE(vsc)); |
| } |
| |
| static const TypeInfo vhost_user_scsi_info = { |
| .name = TYPE_VHOST_USER_SCSI, |
| .parent = TYPE_VHOST_SCSI_COMMON, |
| .instance_size = sizeof(VHostUserSCSI), |
| .class_init = vhost_user_scsi_class_init, |
| .instance_init = vhost_user_scsi_instance_init, |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_FW_PATH_PROVIDER }, |
| { } |
| }, |
| }; |
| |
| static void virtio_register_types(void) |
| { |
| type_register_static(&vhost_user_scsi_info); |
| } |
| |
| type_init(virtio_register_types) |
