qemu

vhost-scsi-common.c (5070B)

---

 /*
  * vhost-scsi-common
  *
  * 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 "qemu/error-report.h"
 #include "qemu/module.h"
 #include "hw/virtio/vhost.h"
 #include "hw/virtio/vhost-scsi-common.h"
 #include "hw/virtio/virtio-scsi.h"
 #include "hw/virtio/virtio-bus.h"
 #include "hw/virtio/virtio-access.h"
 #include "hw/fw-path-provider.h"
 
 int vhost_scsi_common_start(VHostSCSICommon *vsc)
 {
     int ret, i;
     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
 
     VirtIOSCSICommon *vs = (VirtIOSCSICommon *)vsc;
 
     if (!k->set_guest_notifiers) {
         error_report("binding does not support guest notifiers");
         return -ENOSYS;
     }
 
     ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
     if (ret < 0) {
         return ret;
     }
 
     ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
     if (ret < 0) {
         error_report("Error binding guest notifier");
         goto err_host_notifiers;
     }
 
     vsc->dev.acked_features = vdev->guest_features;
 
     assert(vsc->inflight == NULL);
     vsc->inflight = g_new0(struct vhost_inflight, 1);
     ret = vhost_dev_get_inflight(&vsc->dev,
                                  vs->conf.virtqueue_size,
                                  vsc->inflight);
     if (ret < 0) {
         error_report("Error get inflight: %d", -ret);
         goto err_guest_notifiers;
     }
 
     ret = vhost_dev_set_inflight(&vsc->dev, vsc->inflight);
     if (ret < 0) {
         error_report("Error set inflight: %d", -ret);
         goto err_guest_notifiers;
     }
 
     ret = vhost_dev_start(&vsc->dev, vdev, true);
     if (ret < 0) {
         error_report("Error start vhost dev");
         goto err_guest_notifiers;
     }
 
     /* guest_notifier_mask/pending not used yet, so just unmask
      * everything here.  virtio-pci will do the right thing by
      * enabling/disabling irqfd.
      */
     for (i = 0; i < vsc->dev.nvqs; i++) {
         vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
     }
 
     return ret;
 
 err_guest_notifiers:
     g_free(vsc->inflight);
     vsc->inflight = NULL;
 
     k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
 err_host_notifiers:
     vhost_dev_disable_notifiers(&vsc->dev, vdev);
     return ret;
 }
 
 void vhost_scsi_common_stop(VHostSCSICommon *vsc)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
     int ret = 0;
 
     vhost_dev_stop(&vsc->dev, vdev, true);
 
     if (k->set_guest_notifiers) {
         ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
         if (ret < 0) {
                 error_report("vhost guest notifier cleanup failed: %d", ret);
         }
     }
     assert(ret >= 0);
 
     if (vsc->inflight) {
         vhost_dev_free_inflight(vsc->inflight);
         vsc->inflight = NULL;
     }
 
     vhost_dev_disable_notifiers(&vsc->dev, vdev);
 }
 
 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
                                         Error **errp)
 {
     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
 
     /* Turn on predefined features supported by this device */
     features |= vsc->host_features;
 
     return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
 }
 
 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
 {
     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 
     if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
         (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
         error_report("vhost-scsi does not support changing the sense data and "
                      "CDB sizes");
         exit(1);
     }
 }
 
 /*
  * Implementation of an interface to adjust firmware path
  * for the bootindex property handling.
  */
 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
                                         DeviceState *dev)
 {
     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
     /* format: /channel@channel/vhost-scsi@target,lun */
     return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
                            qdev_fw_name(dev), vsc->target, vsc->lun);
 }
 
 static const TypeInfo vhost_scsi_common_info = {
     .name = TYPE_VHOST_SCSI_COMMON,
     .parent = TYPE_VIRTIO_SCSI_COMMON,
     .instance_size = sizeof(VHostSCSICommon),
     .abstract = true,
 };
 
 static void virtio_register_types(void)
 {
     type_register_static(&vhost_scsi_common_info);
 }
 
 type_init(virtio_register_types)