qemu

vhost-user-scsi.c (7386B)

---

 /*
  * 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,
     VIRTIO_F_RING_RESET,
     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 (vhost_dev_is_started(&vsc->dev) == 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)