Bug 978941

Summary:	Grub uses the wrong memory node
Product:	[Fedora] Fedora	Reporter:	Benjamin Herrenschmidt <benh>
Component:	grub2	Assignee:	Peter Jones <pjones>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	18	CC:	bcl, dennis, mads, pfsmorigo, pjones
Target Milestone:	---
Target Release:	---
Hardware:	ppc64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-02-05 21:59:26 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:

Description Benjamin Herrenschmidt 2013-06-27 10:19:45 UTC

Description of problem:

On a system with multiple "/memory@xxx" nodes, grub misbehaves. For it's memory
allocations I observe that it does a "finddevice" call to the client interface
for the "/memory" node and then looks for the "available" property in there.

This is broken potentially on systems with several such nodes, as OF can return
any of the memory nodes. They might not all have an 'available' property and
may represent memory outside of the "RMA" which is the only area grub2 should
be allowed to access in real mode on some systems.

A typical case of that breakage is running under KVM on a 970 where the RMA
is only 256M and the rest of memory is represented in a separate node.

I have added a hack to SLOF to workaround that problem by forcing any "finddevice" of "/memory" to always return "/memory@0" instead but grub should be made smarter and either:

 - Request "/memory@0"

or

 - Iterate all memory nodes and pick up the lowest one

The latter is only needed if that code is to be used on a system which doesn't have memory starting at 0.

At least on powerpc...

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


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Comment 1 Fedora End Of Life 2013-12-21 14:10:20 UTC

This message is a reminder that Fedora 18 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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Comment 2 Fedora End Of Life 2014-02-05 21:59:26 UTC

Fedora 18 changed to end-of-life (EOL) status on 2014-01-14. Fedora 18 is
no longer maintained, which means that it will not receive any further
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