Bug 866984

Summary:	Please enable CONFIG_TCM_VHOST in 3.6 kernels
Product:	[Fedora] Fedora	Reporter:	Julio Entrena Perez <jentrena>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	17	CC:	gansalmon, itamar, jentrena, jonathan, kernel-maint, madhu.chinakonda
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	866981	Environment:
Last Closed:	2012-12-20 15:36:16 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	866981
Bug Blocks:

Description Julio Entrena Perez 2012-10-16 13:33:54 UTC

Applies to Fedora 17 too.

+++ This bug was initially created as a clone of Bug #866981 +++

> Description of problem:
tcm_vhost is not enabled in 3.6 kernels.

> Version-Release number of selected component (if applicable):
kernel 3.6.1-1.fc17.

> How reproducible:
Always.

> Steps to Reproduce:
1. $ grep -r CONFIG_TCM_VHOST /usr/src/kernels/3.6.1-1.fc17.x86_64/.config 
  
> Actual results:
# CONFIG_TCM_VHOST is not set

> Expected results:
CONFIG_TCM_VHOST=m

> Additional info:
http://lwn.net/Articles/508788/

Comment 1 Josh Boyer 2012-10-17 14:59:54 UTC

For future reference, it would be good if you actually said why you want a module enabled.  There's nothing at all about why this should be enabled in the report.

I did it anyway since Justin already did a similar commit for F18.

Comment 2 Julio Entrena Perez 2012-10-17 15:14:43 UTC

(In reply to comment #1)
> For future reference, it would be good if you actually said why you want a
> module enabled.  There's nothing at all about why this should be enabled in
> the report.

Sorry Josh, motivation is to be able to use virtio-scsi with the tcm_vhost fabric to allow SCSI commands sent from KVM guests to reach the backing store.
http://wiki.qemu.org/Features/VirtioSCSI/TCM_Overview

For example, using virtio-scsi with tcm_vhost and target_core_pscsi (SCSI pass-through backing store) allows KVM guests to send TRIM commands to the underlying device (e.g. a SSD drive).

Comment 3 Josh Boyer 2012-10-17 15:29:02 UTC

(In reply to comment #2)
> (In reply to comment #1)
> > For future reference, it would be good if you actually said why you want a
> > module enabled.  There's nothing at all about why this should be enabled in
> > the report.
> 
> Sorry Josh, motivation is to be able to use virtio-scsi with the tcm_vhost
> fabric to allow SCSI commands sent from KVM guests to reach the backing
> store.
> http://wiki.qemu.org/Features/VirtioSCSI/TCM_Overview
> 
> For example, using virtio-scsi with tcm_vhost and target_core_pscsi (SCSI
> pass-through backing store) allows KVM guests to send TRIM commands to the
> underlying device (e.g. a SSD drive).

Awesome.  Thanks for the quick info!  It's always good to have reasoning documented for why something was enabled.

Comment 4 Fedora Update System 2012-10-22 18:39:03 UTC

kernel-3.6.3-1.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/kernel-3.6.3-1.fc17

Comment 5 Fedora Update System 2012-10-23 01:54:16 UTC

Package kernel-3.6.3-1.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing kernel-3.6.3-1.fc17'
as soon as you are able to, then reboot.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-16669/kernel-3.6.3-1.fc17
then log in and leave karma (feedback).

Comment 6 Fedora Update System 2012-12-20 15:36:22 UTC

kernel-3.6.3-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.