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+
+qemu versions 2.10 and 2.11 have error during migration of larger guests
+
+== Comment: #0 - Christian Borntraeger  - 2018-06-28 06:39:27 ==
+Migration fails with larger guests (e.g. 10GB)  on a z system prints an error message in the log 
+
+see /var/log/libvirt/qemu/...
+[...]
+qemu-system-s390x: KVM_S390_SET_CMMA_BITS failed: Bad address
+
+This messes up guest state for the CMMA values (guest data corruption)
+
+This is fixed with 
+
+commit 46fa893355e0bd88f3c59b886f0d75cbd5f0bbbe
+Author:     Claudio Imbrenda <email address hidden>
+AuthorDate: Thu Jan 18 18:51:44 2018 +0100
+Commit:     Cornelia Huck <email address hidden>
+CommitDate: Mon Jan 22 11:04:52 2018 +0100
+
+    s390x: fix storage attributes migration for non-small guests
+    
+    Fix storage attribute migration so that it does not fail for guests
+    with more than a few GB of RAM.
+    With such guests, the index in the buffer would go out of bounds,
+    usually by large amounts, thus receiving -EFAULT from the kernel.
+    Migration itself would be successful, but storage attributes would then
+    not be migrated completely.
+    
+    This patch fixes the out of bounds access, and thus migration of all
+    storage attributes when the guest have large amounts of memory.
+    
+    Cc: <email address hidden>
+    Signed-off-by: Claudio Imbrenda <email address hidden>
+    Fixes: 903fd80b03243476 ("s390x/migration: Storage attributes device")
+    Message-Id: <email address hidden>
+    Reviewed-by: Christian Borntraeger <email address hidden>
+    Signed-off-by: Cornelia Huck <email address hidden>
+
+This fix is part of 2.11.1 so the qemu in bionic is fine.
+The qemu in artful, as well as the qemu in the cloud archives for 16.04 need this fix, so we have
+affected qemus in 17.10 and 16.04. 
+
+Regarding 16.04:
+The bug only triggers for host kernels >= 4.13 - in other words when you combine HWE kernel with the qemu from the cloud archive.
+
+As discussed on IRC, this isn't important for the last week of Artful before EOL.
+But it is for the Cloud Archives longer time I'd think.
+
+So I added a UCA task for them to take a look.
+
+Hello Christian and Frank,
+
+Thanks for reporting this and making Ubuntu better. Very much appreciate your details bug description as well.
+
+I'm working on backporting this to Pike and will update the bug with more details soon.
+
+Thanks,
+Corey
+
+Hello bugproxy, or anyone else affected,
+
+Accepted qemu into pike-proposed. The package will build now and be available in the Ubuntu Cloud Archive in a few hours, and then in the -proposed repository.
+
+Please help us by testing this new package. To enable the -proposed repository:
+
+  sudo add-apt-repository cloud-archive:pike-proposed
+  sudo apt-get update
+
+Your feedback will aid us getting this update out to other Ubuntu users.
+
+If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-pike-needed to verification-pike-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-pike-failed. In either case, details of your testing will help us make a better decision.
+
+Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!
+
+------- Comment From <email address hidden> 2018-06-29 03:41 EDT-------
+Fix verified with
+2.10+dfsg-0ubuntu3.8~cloud1
+
+Thanks for testing. Tagging verification-pike-done according to comment #4 results.
+
+The verification of the Stable Release Update for qemu has completed successfully and the package has now been released to -updates. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.
+
+
+This bug was fixed in the package qemu - 1:2.10+dfsg-0ubuntu3.8~cloud1
+---------------
+
+ qemu (1:2.10+dfsg-0ubuntu3.8~cloud1) xenial-pike; urgency=medium
+ .
+   * d/p/s390x-fix-storage-attrs-migration-for-non-small-guests.patch:
+     Backported from upstream 2.11.1 release to enable successful migration
+     of non-small guests (LP: #1779162).
+
+
+------- Comment From <email address hidden> 2018-07-03 09:10 EDT-------
+IBM bugzilla status ->closed : Fix Released by Canonical
+