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

[Rafael David Tinoco]

/vhost> cd /xen-pvscsi 
l/xen-pvscsi> ls
o- xen-pvscsi .......................................................................... [Targets: 0]
/xen-pvscsi> create 
b"modprobe: ERROR: could not insert 'xen_scsiback': No such device\n"
/xen-pvscsi> quit

Will disable the XEN-PVSCSI then.

## XEN PVSCSI

Same happens for XEN:

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

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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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