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[Qemu-devel] [Bug 1788098] Re: Avoid migration issues with aligned 2MB T

From: Andrew Cloke
Subject: [Qemu-devel] [Bug 1788098] Re: Avoid migration issues with aligned 2MB THB
Date: Tue, 21 Aug 2018 07:08:37 -0000

** Also affects: qemu
   Importance: Undecided
       Status: New

** No longer affects: qemu

** Also affects: ubuntu-power-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-power-systems
     Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)

** Changed in: ubuntu-power-systems
   Importance: Undecided => Critical

** Tags added: triage-g

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  Avoid migration issues with aligned 2MB THB

Status in The Ubuntu-power-systems project:
Status in linux package in Ubuntu:
Status in qemu package in Ubuntu:
Status in linux source package in Bionic:
Status in linux source package in Cosmic:

Bug description:
  ------- Comment From address@hidden 2018-08-20 17:12 EDT-------
  Hi, in some environments it was observed that this qemu patch to enable THP 
made it more likely to hit guest migration issues, however the following kernel 
patch resolves those migration issues:

  KVM: PPC: Book3S HV: Use correct pagesize in kvm_unmap_radix()

  Once merged upstream, it would be good to include that change as well
  to avoid potential migration problems. Should I open a new bug for
  that or is it better to track here?

  Note Paelzer: I have not seen related migration issues myself, but it
  seems reasonable and confirmed by IBM.

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