--- Comment From p...@au1.ibm.com 2019-09-27 01:51 EDT---
(In reply to comment #73)
> Leonardo, can you elaborate on the 'other possible issues'? We're hesitant
> to pull 18 patches into a stable kernel under the assumption that they
> *might* fix some *potential* issues, without clear evid
--- Comment From mranw...@us.ibm.com 2019-09-26 15:42 EDT---
Re-opening on our side to test in 19.10. Everything should be there for that,
but it would be good to confirm this in time to get any needed fixes to 20.04,
too. Just being clear at this point we don't need to target bionic -
--- Comment From mranw...@us.ibm.com 2019-05-13 17:04 EDT---
Adding Paul Mackerras - can you help with the context for the patches - beyond
the potential performance impact? We were picking up this series because it
fixes the migration problem, which appeared after adding a patch for bu
--- Comment From leona...@ibm.com 2019-05-10 19:54 EDT---
Hello Juerg,
As this complete list was suggested by Paul, I think he may be the best
person to show the context of the patch series.
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--- Comment From leona...@ibm.com 2019-04-29 18:50 EDT---
(In reply to comment #70)
> Leonardo, since you seem to have a reliable reproducer now, could you give
> this test kernel [1] a try? It just contains commit c066fafc595e ("KVM: PPC:
> Book3S HV: Use correct pagesize in kvm_unmap_radi
--- Comment From leona...@ibm.com 2019-04-10 12:08 EDT---
(In reply to comment #68)
> In comment #22 above, it states that "In a meeting with lagarcia, I was
> informed this patch is very important, and that it is already on kernel
> 4.18-15 onwards."
>
> So, I assume that the required patc
--- 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
--- Comment From leona...@ibm.com 2019-04-08 10:37 EDT---
This (In reply to comment #64)
> Hi Leonardo,
> unfortunately there was an issue with the SRU request and Juerg NACK-ed it,
> please have a look here:
> https://lists.ubuntu.com/archives/kernel-team/2019-March/099128.html
> Please re
--- Comment From leona...@ibm.com 2019-03-26 13:12 EDT---
Updating:
The patchset was acked by Juerg Haefliger on Mar 13.
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https://bugs.launchpad.net/bugs/1788098
Tit
--- Comment From leona...@ibm.com 2019-03-14 15:47 EDT---
Patchset SRU
[Impact]
* VMs have a high chance to hit guest migration issues if more than one guest
migration happens at a time, while using THP on ppc64le.
* Migrating VMs in parallel will cause at least one guest to crash about
--- Comment From leona...@ibm.com 2019-03-12 14:52 EDT---
(In reply to comment #60)
The patches were sent to Ubuntu kernel-team mailing list.
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--- Comment From leona...@ibm.com 2019-02-26 12:58 EDT---
Here are the patches:
https://gitlab.com/LeoBras/bionic/compare/master...lp1788098
Also, I attached a tgz with the patches.
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--- Comment From leona...@ibm.com 2019-02-26 12:36 EDT---
(In reply to comment #41)
> ...or perhaps I've misunderstood. Are the patches listed in comment #23 the
> complete set required to resolve the issue (with no complex backporting
> required)?
Yes, the patches listed by Paul are the o
--- Comment From leona...@ibm.com 2019-02-25 18:35 EDT---
I cherry-picked all patches on top of ubuntu-bionic (Ubuntu-4.15.0-45.48).
Then, the next step was trying to find a way to reproduce the bug.
I have noted, after several tests, that the previous suggestion of
Michael Ranweiler was
--- Comment From p...@au1.ibm.com 2019-02-19 20:52 EDT---
(In reply to comment #34)
> In a meeting with lagarcia, I was informed this patch is very important, and
> that it is already on kernel 4.18-15 onwards.
>
> In fact, including this one. there are two important patches on this subject
--- Comment From leona...@ibm.com 2019-02-08 14:05 EDT---
In a meeting with lagarcia, I was informed this patch is very important, and
that it is already on kernel 4.18-15 onwards.
In fact, including this one. there are two important patches on this
subject:
https://git.kernel.org/pub/sc
--- Comment From leona...@ibm.com 2019-01-24 09:34 EDT---
By the test results, the problem doesn't seem to reproduce.
Are there any other suggestions to reproduce it?
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--- Comment From leona...@ibm.com 2019-01-24 09:26 EDT---
By suggestion of Michael Ranweiler, I did some concurrent migration tests.
In fact, I just repeated the procedure used before, but did it twice at roughly
the same time (in parallel).
The results are attached.
Migration 1: from1.t
--- Comment From leona...@ibm.com 2019-01-04 14:29 EDT---
Test: Verify all memory after migration
###
Host:
###
# uname -a
Linux host 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:14:44 UTC 2018
ppc64le ppc64le ppc64le GNU/Linux
#cat /sys/kernel/mm/trans
--- Comment From leona...@ibm.com 2019-01-04 06:12 EDT---
I have tried the following test in order to reproduce the bug:
##
root@localhost:~# uname -a
Linux localhost 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:14:44 UTC 2018
ppc64le ppc64le ppc64le GNU/Linux
root@localhost:~# cat /sys
--- Comment From leona...@ibm.com 2018-12-21 12:10 EDT---
Hello,
I have been trying to reproduce this bug over this week, but I couldn't
do so on Ubuntu.
Could anyone verify what I have been doing wrong?
#
## QEMU
I have built version Qemu 3.1.0 and made sure the patch
21 matches
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