------- Comment From p...@au1.ibm.com 2019-04-10 04:10 EDT-------
(In reply to comment #66)
> Stefan NACK'ed the series. For some unknown reason that email did make it
> into the archive so here is ist content:
>
> > Since commit fb1522e099f0 ("KVM: update to new mmu_notifier semantic
> > v2", 2017-08-31), the MMU notifier code in KVM no longer calls the
> > kvm_unmap_hva callback. This removes the PPC implementations of
> > kvm_unmap_hva().
>
> This is not really the way SRUs should be done. We cannot remove support for
> interfaces after release. Also the amount of change as a requisite should be
> kept as minimal as possible. This just feels like too many changes without a
> strong argument on why this must be done that way.
>
> -Stefan
Well it was just removing dead code, but whatever.
The series should be fine without that patch.
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https://bugs.launchpad.net/bugs/1788098
Title:
Avoid migration issues with aligned 2MB THB
Status in The Ubuntu-power-systems project:
Incomplete
Status in linux package in Ubuntu:
Incomplete
Status in qemu package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Incomplete
Status in linux source package in Cosmic:
Invalid
Bug description:
FYI: This blocks bug 1781526 - once this one here is resolved we can
go on with SRU considerations for 1781526
------- Comment From jhop...@us.ibm.com 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:
https://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git/commit/?h=kvm-ppc-next&id=c066fafc595eef5ae3c83ae3a8305956b8c3ef15
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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