/srv/irclogs.ubuntu.com/2017/08/30/#ubuntu-s390x.txt

hwscpaelzer: Test07:59
cpaelzerhws: exactly08:00
cpaelzerand after a long discussion like08:00
cpaelzer108:00
cpaelzer208:00
cpaelzer308:00
cpaelzeryou could highlight more people to read the above via08:00
cpaelzerhws: ^^08:00
cpaelzerhws: btw I also created a bug for a kernel contrib by borntraeger around KVM and zero pages08:16
cpaelzerhws: you should have a mail to mirror that back08:16
cpaelzerare you the right one to do so?08:16
cpaelzer(the mirroring)08:16
hwscpaelzer: already done08:16
cpaelzergreat08:16
cpaelzerwhile we are here - good morning borntraeger08:17
hwscpaelzer: already an answer available :)08:17
cpaelzerborntraeger: the alignment patch on qemu missed 2.10 as many others did this release08:17
cpaelzerborntraeger: did you hear anything on an earlier than usual 2.10.1 and if so any date rumors?08:17
borntraegercpaelzer, only wishes, but no facts08:18
cpaelzerhws: the update didn't flow down to me through the tool yet08:18
cpaelzerborntraeger: ok, that is my state - thanks08:18
hwscpaelzer: just to shortcut..... FWIW, this fix is only necessary if you have guest that use storage keys - e.g. an 16.04 guest should not trigger this problem.08:19
cpaelzerhws: do we have any linux guests that use storgae keys in the meantime?08:21
cpaelzerI might have lost track08:21
hwscpaelzer: question for christian...08:21
cpaelzerand as a HV host it is a bit weird, as you can only make "so much" assumption on your guests08:21
cpaelzerwho says no one uses a Ubuntu Xenial as host in 2020 (still supported then) with a new Guest that suddenly uses stroage keys08:22
cpaelzer...08:22
cpaelzeranyway this is just the sort of discussion that I wanted on that bugzilla08:22
cpaelzerfor a more permanent documentation of the case08:22
cpaelzerand since it is mirrored now this will happen08:23
cpaelzerI don't mind loosing a few hours for the mirroring08:23
borntraegercpaelzer, hws no current Linux guest uses storage keys08:32
borntraegersles 11 and rhel6 do08:32
borntraegersles12, rhel7 ubuntu 16.04 do not08:32
cpaelzerwell the old one before we removed it08:32
cpaelzerso since there is no intention to add storage keys back in Linux or host non Linux (not intention I'd know of) - the TL;DR is "not needed"?08:33
borntraegercpaelzer, unless you want to support some old debians as guest or so08:40
cpaelzerborntraeger: did anybody check if there really is no perf impact?08:45
cpaelzerI know that over time all pages will be used08:45
cpaelzerbut I thought the zero page would still be overloaded08:45
cpaelzeror is even the fix08:45
cpaelzeronly active on storage key using guests08:45
cpaelzerborntraeger: and so it is not only "not needed" but even when applied "not actively changing" the zero page handling as long as you have only "new" guests?08:46
borntraegercpaelzer, if a guest has a pattern of only reading a page, it will be a zero page inside the guest08:48
borntraegercpaelzer, the fix is to not use zero pages in the host to back guest pages08:49

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