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Bug 247982

Summary: need a way to disable ide drivers
Product: Red Hat Enterprise Linux 5 Reporter: Gerd Hoffmann <kraxel>
Component: kernelAssignee: Gerd Hoffmann <kraxel>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: medium    
Version: 5.0CC: ddutile, kernel-mgr, xen-maint
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2008-0314 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-05-21 14:46:04 UTC Type: ---
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:    
Bug Blocks: 251292, 425461    
Attachments:
Description Flags
patch intoduces ide=disable none

Description Gerd Hoffmann 2007-07-12 14:25:44 UTC 
Description of problem:
We want be able to run RHEL-5 fully virtualized guests with paravirtualized
drivers.  Xen emulates a IDE disk controller (PIIX3) which is driven by the
drivers/ide/ subsystem in RHEL-5.

The ide drivers are compiled statically, thus it is impossible to select ide vs.
paravirtualied driver by module load order.  That in turn requires an kernel
command line option to disable the ide drivers so the paravirtual driver can
step in.

As the paravirtual drivers are optional we can't automatically disable ide for
the xen disk controller, although it can easily be identified by pci subsystem id.
Comment 1 Gerd Hoffmann 2007-07-12 14:26:55 UTC 
Created attachment 159061 [details]
patch intoduces ide=disable
Comment 2 RHEL Program Management 2007-08-30 16:07:02 UTC 
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 4 Don Zickus 2007-11-29 17:05:31 UTC 
in 2.6.18-58.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5
Comment 7 errata-xmlrpc 2008-05-21 14:46:04 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2008-0314.html