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

[Rafael David Tinoco]

Please other teams/people,

let me know your thoughts. I'm able to disable those existing fabric LIO
modules, but... at least TCM VHOST might be worth to be kept (if we can
explore/enable in QEMU).

Cheers

** Summary changed:

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

** Description changed:

+ targetcli-fb was recently included in MAIN and rely on some features
+ that aren't available currently in Ubuntu:
  
- targetcli-fb was recently included in MAIN and one of its features is the VHOST TCM:
+ ## TCM VHOST
  
- /vhost> create 
+ /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.

** Changed in: qemu (Ubuntu)
    Milestone: None => ubuntu-20.10-beta

** Changed in: python-rtslib-fb (Ubuntu)
    Milestone: None => ubuntu-20.10-beta

** Changed in: linux (Ubuntu)
    Milestone: None => ubuntu-20.10-beta

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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:
  Incomplete
Status in python-rtslib-fb package in Ubuntu:
  In Progress
Status in qemu package in Ubuntu:
  New

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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