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 <linux/vhost.h> 20 #include "qapi/error.h" 21 #include "qemu/error-report.h" 22 #include "migration/migration.h" 23 #include "hw/virtio/vhost.h" 24 #include "hw/virtio/vhost-scsi-common.h" 25 #include "hw/virtio/virtio-scsi.h" 26 #include "hw/virtio/virtio-bus.h" 27 #include "hw/virtio/virtio-access.h" 28 #include "hw/fw-path-provider.h" 29 30 int vhost_scsi_common_start(VHostSCSICommon *vsc) 31 { 32 int ret, i; 33 VirtIODevice *vdev = VIRTIO_DEVICE(vsc); 34 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 35 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 36 37 if (!k->set_guest_notifiers) { 38 error_report("binding does not support guest notifiers"); 39 return -ENOSYS; 40 } 41 42 ret = vhost_dev_enable_notifiers(&vsc->dev, vdev); 43 if (ret < 0) { 44 return ret; 45 } 46 47 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, true); 48 if (ret < 0) { 49 error_report("Error binding guest notifier"); 50 goto err_host_notifiers; 51 } 52 53 vsc->dev.acked_features = vdev->guest_features; 54 ret = vhost_dev_start(&vsc->dev, vdev); 55 if (ret < 0) { 56 error_report("Error start vhost dev"); 57 goto err_guest_notifiers; 58 } 59 60 /* guest_notifier_mask/pending not used yet, so just unmask 61 * everything here. virtio-pci will do the right thing by 62 * enabling/disabling irqfd. 63 */ 64 for (i = 0; i < vsc->dev.nvqs; i++) { 65 vhost_virtqueue_mask(&vsc->dev, vdev, vsc->dev.vq_index + i, false); 66 } 67 68 return ret; 69 70 err_guest_notifiers: 71 k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); 72 err_host_notifiers: 73 vhost_dev_disable_notifiers(&vsc->dev, vdev); 74 return ret; 75 } 76 77 void vhost_scsi_common_stop(VHostSCSICommon *vsc) 78 { 79 VirtIODevice *vdev = VIRTIO_DEVICE(vsc); 80 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 81 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 82 int ret = 0; 83 84 vhost_dev_stop(&vsc->dev, vdev); 85 86 if (k->set_guest_notifiers) { 87 ret = k->set_guest_notifiers(qbus->parent, vsc->dev.nvqs, false); 88 if (ret < 0) { 89 error_report("vhost guest notifier cleanup failed: %d", ret); 90 } 91 } 92 assert(ret >= 0); 93 94 vhost_dev_disable_notifiers(&vsc->dev, vdev); 95 } 96 97 uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features, 98 Error **errp) 99 { 100 VHostSCSICommon *vsc = VHOST_SCSI_COMMON(vdev); 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