Bug 978941 - Grub uses the wrong memory node
Grub uses the wrong memory node
Product: Fedora
Classification: Fedora
Component: grub2 (Show other bugs)
ppc64 Linux
unspecified Severity high
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Assigned To: Peter Jones
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-06-27 06:19 EDT by Benjamin Herrenschmidt
Modified: 2014-02-05 16:59 EST (History)
5 users (show)

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Last Closed: 2014-02-05 16:59:26 EST
Type: Bug
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Description Benjamin Herrenschmidt 2013-06-27 06:19:45 EDT
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"


 - 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...

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Comment 1 Fedora End Of Life 2013-12-21 09:10:20 EST
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Comment 2 Fedora End Of Life 2014-02-05 16:59:26 EST
Fedora 18 changed to end-of-life (EOL) status on 2014-01-14. Fedora 18 is
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