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

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Date: Wed, 10 Dec 2014 15:57:33 -0000
Reply-to: Bug 1401150 <1401150@xxxxxxxxxxxxxxxxxx>
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** Tags removed: targetmilestone-inin1404
** Tags added: targetmilestone-inin14042

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https://bugs.launchpad.net/bugs/1401150

Title:
  Endianness issue in the VPHN topology update code

Status in linux package in Ubuntu:
  New

Bug description:
  -- 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

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