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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.
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