diff options
Diffstat (limited to 'hw/scsi/vhost-user-scsi.c')
| -rw-r--r-- | hw/scsi/vhost-user-scsi.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c new file mode 100644 index 0000000000..500fa6a067 --- /dev/null +++ b/hw/scsi/vhost-user-scsi.c @@ -0,0 +1,205 @@ +/* + * 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 "qemu/typedefs.h" +#include "qom/object.h" +#include "hw/fw-path-provider.h" +#include "hw/qdev-core.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" + +/* 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, + VHOST_INVALID_FEATURE_BIT +}; + +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 (vsc->dev.started == 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_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); + 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; + } + + vsc->dev.nvqs = 2 + vs->conf.num_queues; + vsc->dev.vqs = g_new(struct vhost_virtqueue, vsc->dev.nvqs); + vsc->dev.vq_index = 0; + vsc->dev.backend_features = 0; + + ret = vhost_dev_init(&vsc->dev, (void *)&vs->conf.chardev, + VHOST_BACKEND_TYPE_USER, 0); + if (ret < 0) { + error_setg(errp, "vhost-user-scsi: vhost initialization failed: %s", + strerror(-ret)); + return; + } + + /* Channel and lun both are 0 for bootable vhost-user-scsi disk */ + vsc->channel = 0; + vsc->lun = 0; + vsc->target = vs->conf.boot_tpgt; +} + +static void vhost_user_scsi_unrealize(DeviceState *dev, Error **errp) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostUserSCSI *s = VHOST_USER_SCSI(dev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + + /* This will stop the vhost backend. */ + vhost_user_scsi_set_status(vdev, 0); + + vhost_dev_cleanup(&vsc->dev); + g_free(vsc->dev.vqs); + + virtio_scsi_common_unrealize(dev, errp); +} + +static uint64_t vhost_user_scsi_get_features(VirtIODevice *vdev, + uint64_t features, Error **errp) +{ + VHostUserSCSI *s = VHOST_USER_SCSI(vdev); + + /* Turn on predefined features supported by this device */ + features |= s->host_features; + + return vhost_scsi_common_get_features(vdev, features, errp); +} + +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, 1), + 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", VHostUserSCSI, host_features, + VIRTIO_SCSI_F_HOTPLUG, + true), + DEFINE_PROP_BIT64("param_change", VHostUserSCSI, host_features, + VIRTIO_SCSI_F_CHANGE, + true), + 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); + + dc->props = 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_user_scsi_get_features; + vdc->set_config = vhost_scsi_common_set_config; + vdc->set_status = vhost_user_scsi_set_status; + 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), NULL); +} + +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) |