Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

For bugs related to Red Hat Enterprise Linux 5 product line. The current stable release is 5.10. For Red Hat Enterprise Linux 6 and above, please visit Red Hat JIRA https://issues.redhat.com/secure/CreateIssue!default.jspa?pid=12332745 to report new issues.

Bug 514647

Summary:	[Cisco 5.5 bug] MCFG area at a0000000 is not E820 reserved, Error Message
Product:	Red Hat Enterprise Linux 5	Reporter:	Abdul Khan <abdulkh>
Component:	kernel-xen	Assignee:	Xen Maintainance List <xen-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.5	CC:	andriusb, clalance, pbonzini, xen-maint
Target Milestone:	rc	Keywords:	OtherQA
Target Release:	5.4
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-08-13 14:14:55 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:

Description Abdul Khan 2009-07-30 01:47:35 UTC

Description of problem:

Error message thrown when the system with XEN kernel boots up.
MCFG area at a0000000 is not E820 reserved

Version-Release number of selected component (if applicable):
RHEL 5.3

How reproducible:
Often

Steps to Reproduce:
1. Reboot the system
2. Look at the messages
3.
  
Actual results:
MCFG area at a0000000 is not E820 reserved, error message is displayed

Expected results:
There should be no error message

Additional info:
I was told that this error message is benign and does not harm the system.

Comment 3 Paolo Bonzini 2009-08-13 14:14:55 UTC

Fixed by 7b80b7bb

When you boot up the Xen kernel as either a dom0 or a domU, the boot messages always include:
    
PCI: BIOS Bug: MCFG area at e0000000 is not E820-reserved
    
That's because the e820 mapped passed from the hypervisor to any domain, including dom0, is always one large RAM region; there are no holes.  Silence  this totally bogus warning on Xen, since it is not a bug there. (v2: only silence the "BIOS BUG" message, but still print the "Not using MMCONFIG" for debugging)

*** This bug has been marked as a duplicate of bug 462572 ***

Comment 4 Andrius Benokraitis 2009-08-13 14:43:06 UTC

Abdul - this was fixed in in kernel-2.6.18-137.el5

You can download this test (or any newer) kernel from http://people.redhat.com/dzickus/el5

Please re-open if you see any issues.

Comment 6 Chris Lalancette 2010-07-19 13:39:34 UTC

Clearing out old flags for reporting purposes.

Chris Lalancette