hw/scsi/vhost-scsi-common.c

   1 /*
   2  * vhost-scsi-common
   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 "qemu/error-report.h"
  20 #include "migration/migration.h"
  21 #include "hw/virtio/vhost.h"
  22 #include "hw/virtio/vhost-scsi-common.h"
  23 #include "hw/virtio/virtio-scsi.h"
  24 #include "hw/virtio/virtio-bus.h"
  25 #include "hw/virtio/virtio-access.h"
  26 #include "hw/fw-path-provider.h"
  27
  28 int vhost_scsi_common_start(VHostSCSICommon *vsc)
  29 {
  30     int ret, i;
  31     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
  32     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
  33     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
  34
  35     if (!k->set_guest_notifiers) {
  36         error_report("binding does not support guest notifiers");
  37         return -ENOSYS;
  38     }
  39
  40     ret = vhost_dev_enable_notifiers(&vsc->dev, vdev);
  41     if (ret < 0) {
  42         return ret;
  43     }
  44
  45     ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true);
  46     if (ret < 0) {
  47         error_report("Error binding guest notifier");
  48         goto err_host_notifiers;
  49     }
  50
  51     vsc->dev.acked_features = vdev->guest_features;
  52     ret = vhost_dev_start(&vsc->dev, vdev);
  53     if (ret < 0) {
  54         error_report("Error start vhost dev");
  55         goto err_guest_notifiers;
  56     }
  57
  58     /* guest_notifier_mask/pending not used yet, so just unmask
  59      * everything here.  virtio-pci will do the right thing by
  60      * enabling/disabling irqfd.
  61      */
  62     for (i = 0; i < vsc->dev.nvqs; i++) {
  63         vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false);
  64     }
  65
  66     return ret;
  67
  68 err_guest_notifiers:
  69     k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  70 err_host_notifiers:
  71     vhost_dev_disable_notifiers(&vsc->dev, vdev);
  72     return ret;
  73 }
  74
  75 void vhost_scsi_common_stop(VHostSCSICommon *vsc)
  76 {
  77     VirtIODevice *vdev = VIRTIO_DEVICE(vsc);
  78     BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
  79     VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
  80     int ret = 0;
  81
  82     vhost_dev_stop(&vsc->dev, vdev);
  83
  84     if (k->set_guest_notifiers) {
  85         ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false);
  86         if (ret < 0) {
  87                 error_report("vhost guest notifier cleanup failed: %d", ret);
  88         }
  89     }
  90     assert(ret >= 0);
  91
  92     vhost_dev_disable_notifiers(&vsc->dev, vdev);
  93 }
  94
  95 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
  96                                         Error **errp)
  97 {
  98     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev);
  99
 100     return vhost_get_features(&vsc->dev, vsc->feature_bits, features);
 101 }
 102
 103 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config)
 104 {
 105     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
 106     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
 107
 108     if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size ||
 109         (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) {
 110         error_report("vhost-scsi does not support changing the sense data and "
 111                      "CDB sizes");
 112         exit(1);
 113     }
 114 }
 115
 116 /*
 117  * Implementation of an interface to adjust firmware path
 118  * for the bootindex property handling.
 119  */
 120 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
 121                                         DeviceState *dev)
 122 {
 123     VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
 124     /* format: /channel@channel/vhost-scsi@target,lun */
 125     return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel,
 126                            qdev_fw_name(dev), vsc->target, vsc->lun);
 127 }
 128
 129 static const TypeInfo vhost_scsi_common_info = {
 130     .name = TYPE_VHOST_SCSI_COMMON,
 131     .parent = TYPE_VIRTIO_SCSI_COMMON,
 132     .instance_size = sizeof(VHostSCSICommon),
 133     .abstract = true,
 134 };
 135
 136 static void virtio_register_types(void)
 137 {
 138     type_register_static(&vhost_scsi_common_info);
 139 }
 140
 141 type_init(virtio_register_types)