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 "hw/virtio/vhost.h" 21 #include "hw/virtio/vhost-scsi-common.h" 22 #include "hw/virtio/virtio-scsi.h" 23 #include "hw/virtio/virtio-bus.h" 24 #include "hw/virtio/virtio-access.h" 25 #include "hw/fw-path-provider.h" 26 27 int vhost_scsi_common_start(VHostSCSICommon *vsc) 28 { 29 int ret, i; 30 VirtIODevice *vdev = VIRTIO_DEVICE(vsc); 31 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 32 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 33 34 if (!k->set_guest_notifiers) { 35 error_report("binding does not support guest notifiers"); 36 return -ENOSYS; 37 } 38 39 ret = vhost_dev_enable_notifiers(&vsc->dev, vdev); 40 if (ret < 0) { 41 return ret; 42 } 43 44 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true); 45 if (ret < 0) { 46 error_report("Error binding guest notifier"); 47 goto err_host_notifiers; 48 } 49 50 vsc->dev.acked_features = vdev->guest_features; 51 ret = vhost_dev_start(&vsc->dev, vdev); 52 if (ret < 0) { 53 error_report("Error start vhost dev"); 54 goto err_guest_notifiers; 55 } 56 57 /* guest_notifier_mask/pending not used yet, so just unmask 58 * everything here. virtio-pci will do the right thing by 59 * enabling/disabling irqfd. 60 */ 61 for (i = 0; i < vsc->dev.nvqs; i++) { 62 vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false); 63 } 64 65 return ret; 66 67 err_guest_notifiers: 68 k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); 69 err_host_notifiers: 70 vhost_dev_disable_notifiers(&vsc->dev, vdev); 71 return ret; 72 } 73 74 void vhost_scsi_common_stop(VHostSCSICommon *vsc) 75 { 76 VirtIODevice *vdev = VIRTIO_DEVICE(vsc); 77 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 78 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 79 int ret = 0; 80 81 vhost_dev_stop(&vsc->dev, vdev); 82 83 if (k->set_guest_notifiers) { 84 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); 85 if (ret < 0) { 86 error_report("vhost guest notifier cleanup failed: %d", ret); 87 } 88 } 89 assert(ret >= 0); 90 91 vhost_dev_disable_notifiers(&vsc->dev, vdev); 92 } 93 94 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features, 95 Error **errp) 96 { 97 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); 98 99 /* Turn on predefined features supported by this device */ 100 features |= vsc->host_features; 101 102 return vhost_get_features(&vsc->dev, vsc->feature_bits, features); 103 } 104 105 void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config) 106 { 107 VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; 108 VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); 109 110 if ((uint32_t)virtio_ldl_p(vdev, &scsiconf->sense_size) != vs->sense_size || 111 (uint32_t)virtio_ldl_p(vdev, &scsiconf->cdb_size) != vs->cdb_size) { 112 error_report("vhost-scsi does not support changing the sense data and " 113 "CDB sizes"); 114 exit(1); 115 } 116 } 117 118 /* 119 * Implementation of an interface to adjust firmware path 120 * for the bootindex property handling. 121 */ 122 char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus, 123 DeviceState *dev) 124 { 125 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev); 126 /* format: /channel@channel/vhost-scsi@target,lun */ 127 return g_strdup_printf("/channel@%x/%s@%x,%x", vsc->channel, 128 qdev_fw_name(dev), vsc->target, vsc->lun); 129 } 130 131 static const TypeInfo vhost_scsi_common_info = { 132 .name = TYPE_VHOST_SCSI_COMMON, 133 .parent = TYPE_VIRTIO_SCSI_COMMON, 134 .instance_size = sizeof(VHostSCSICommon), 135 .abstract = true, 136 }; 137 138 static void virtio_register_types(void) 139 { 140 type_register_static(&vhost_scsi_common_info); 141 } 142 143 type_init(virtio_register_types) 144