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[Bug 1401150] [NEW] Endianness issue in the VPHN topology update code

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From: Launchpad Bug Tracker <1401150@xxxxxxxxxxxxxxxxxx>
Date: Wed, 10 Dec 2014 15:53:05 -0000
Reply-to: Bug 1401150 <1401150@xxxxxxxxxxxxxxxxxx>
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-- Problem Description --
The current VPHN code assumes the NUMA toplogy updates data are big endian. They are native endian actually since the hypervisor pass them through registers. This has a great performance impact on little endian guests.

A fix has been sent to fix the issue:

http://patchwork.ozlabs.org/patch/396171/

Please pick the following commit from Michael Ellermans's tree:

http://git.kernel.org/cgit/linux/kernel/git/mpe/linux.git/commit/?id=5c9fb1899400096c6818181c525897a31d57e488

which reads: "powerpc/vphn: NUMA node code expects big-endian"

Now upstream:

commit 5c9fb1899400096c6818181c525897a31d57e488
Author: Greg Kurz <gkurz@xxxxxxxxxxxxxxxxxx>
Date:   Wed Oct 15 12:42:58 2014 +0200

    powerpc/vphn: NUMA node code expects big-endian

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bugnameltc-117090 severity-high targetmilestone-inin1404
-- 
Endianness issue in the VPHN topology update code
https://bugs.launchpad.net/bugs/1401150
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