vhost-scsi 以及 vhost-user-scsi

vhost-scsi 居然不能热迁移，真奇怪的

https://github.com/spdk/spdk/issues/162

https://access.redhat.com/solutions/3394851

vhost 注入恐怕还是通过 qemu 的接口注入中断的

基本原理

[!NOTE] 参考神奇海螺的意见，有待验证

vhost-scsi 的接法是先在 host 建立 LIO target，再让 collei 按 WWPN 连接。

准备过程为：加载 vhost_scsi，使用 targetcli 创建独立 raw 文件的 FILEIO backstore，在 /vhost 下创建 WWN、TPG、nexus 和 LUN 映射，并确保运行 QEMU 的用户能读写 /dev/vhost-scsi。LIO 的 vhost fabric 由 targetcli/rtslib 管理。rtslib 的 VhostFabricModule (https://github.com/open-iscsi/rtslib-fb/blob/master/rtslib/fabric.py)

collei 最终需要生成的设备参数形如：

-device vhost-scsi-pci,id=vhost_scsi0,wwpn=naa.5001405000000001,num_queues=1

vhost-scsi 的使用

https://zonedstorage.io/docs/tools/qemu

到底怎么用还是不知道:

static const struct target_core_fabric_ops vhost_scsi_ops = {
	.module				= THIS_MODULE,
	.fabric_name			= "vhost",
	.max_data_sg_nents		= VHOST_SCSI_PREALLOC_SGLS,
	.tpg_get_wwn			= vhost_scsi_get_fabric_wwn,
	.tpg_get_tag			= vhost_scsi_get_tpgt,
	.tpg_check_demo_mode		= vhost_scsi_check_true,
	.tpg_check_demo_mode_cache	= vhost_scsi_check_true,
	.tpg_check_prot_fabric_only	= vhost_scsi_check_prot_fabric_only,
	.release_cmd			= vhost_scsi_release_cmd,
	.check_stop_free		= vhost_scsi_check_stop_free,
	.sess_get_initiator_sid		= NULL,
	.write_pending			= vhost_scsi_write_pending,
	.queue_data_in			= vhost_scsi_queue_data_in,
	.queue_status			= vhost_scsi_queue_status,
	.queue_tm_rsp			= vhost_scsi_queue_tm_rsp,
	.aborted_task			= vhost_scsi_aborted_task,
	/*
	 * Setup callers for generic logic in target_core_fabric_configfs.c
	 */
	.fabric_make_wwn		= vhost_scsi_make_tport,
	.fabric_drop_wwn		= vhost_scsi_drop_tport,
	.fabric_make_tpg		= vhost_scsi_make_tpg,
	.fabric_drop_tpg		= vhost_scsi_drop_tpg,
	.fabric_post_link		= vhost_scsi_port_link,
	.fabric_pre_unlink		= vhost_scsi_port_unlink,

	.tfc_wwn_attrs			= vhost_scsi_wwn_attrs,
	.tfc_tpg_base_attrs		= vhost_scsi_tpg_attrs,
	.tfc_tpg_attrib_attrs		= vhost_scsi_tpg_attrib_attrs,

	.default_submit_type		= TARGET_QUEUE_SUBMIT,
	.direct_submit_supp		= 1,
};

似乎是必须使用 iscsi 吗?

vhost_scsi_make_tport

	ptr = strstr(name, "naa.");
	if (ptr) {
		tport->tport_proto_id = SCSI_PROTOCOL_SAS;
		goto check_len;
	}
	ptr = strstr(name, "fc.");
	if (ptr) {
		tport->tport_proto_id = SCSI_PROTOCOL_FCP;
		off = 3; /* Skip over "fc." */
		goto check_len;
	}
	ptr = strstr(name, "iqn.");
	if (ptr) {
		tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
		goto check_len;
	}

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