[Bug 1891214] Re: targetcli/LIO needs tcm_vhost and xen-scsiback feature enabled OR option disabled

[Rafael David Tinoco]

$ sudo modinfo tcm_vhost
filename:       /lib/modules/5.8.0-18-generic/kernel/drivers/vhost/vhost_scsi.ko
license:        GPL
alias:          tcm_vhost
description:    VHOST_SCSI series fabric driver
srcversion:     2AD428CAF926D0F5A58751D
depends:        target_core_mod,vhost
retpoline:      Y
intree:         Y
name:           vhost_scsi
vermagic:       5.8.0-18-generic SMP mod_unload 
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        36:2A:15:BD:BF:65:C1:25:91:5F:A9:27:E5:4C:76:B8:C2:26:6B:1C
sig_hashalgo:   sha512
signature:      65:8B:63:37:F0:CE:40:48:AF:56:65:DC:F3:6F:29:DB:E8:D9:A7:86:

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https://bugs.launchpad.net/bugs/1891214

Title:
  targetcli/LIO needs tcm_vhost and xen-scsiback feature enabled OR
  option disabled

Status in linux package in Ubuntu:
  Fix Released
Status in python-rtslib-fb package in Ubuntu:
  Confirmed
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  targetcli-fb was recently included in MAIN and rely on some features
  that aren't available currently in Ubuntu:

  ## TCM VHOST

  /vhost> create
  b'modprobe: FATAL: Module tcm_vhost not found in directory /lib/modules/...

  not enabled in Ubuntu kernels.

  QEMU virtio-scsi feature:

  https://wiki.qemu.org/Features/VirtioSCSI/TCM_Overview

  KERNEL option to be enabled:

  https://cateee.net/lkddb/web-lkddb/TCM_VHOST.html

  KERNEL TCM documentation:

  https://www.kernel.org/doc/html/latest/target/tcmu-design.html

  LIO (LinuxIO) VHOST feature explained:

  http://linux-iscsi.org/wiki/VHost

  ## XEN PVSCSI

  Same happens for XEN:

  https://wiki.xenproject.org/wiki/Paravirtualized_SCSI

  PS: this would I would go for a targetcli fabric module disablement
  instead of enabling the feature.

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