Bug 49425 – 4.4: Snapshot restore breaks <cpu model="host-model">

Bug 49425 - 4.4: Snapshot restore breaks <cpu model="host-model">


Summary:	4.4: Snapshot restore breaks <cpu model="host-model">

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	Virtualization - KVM
Version:	UCS 4.4
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 4.4-0-errata
Assigned To:	Erik Damrose
QA Contact:	Arvid Requate

URL:
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Depends on:	21386 48536 49441
Blocks:
	Show dependency tree / graph

Reported:	2019-05-07 16:26 CEST by Erik Damrose
Modified:	2019-05-09 20:25 CEST (History)
CC List:	0 users

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What kind of report is it?:	Bug Report
What type of bug is this?:	5: Major Usability: Impairs usability in key scenarios
Who will be affected by this bug?:	3: Will affect average number of installed domains
How will those affected feel about the bug?:	5: Blocking further progress on the daily work
User Pain:	0.429
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Description Erik Damrose

2019-05-07 16:26:21 CEST

Needs to be fixed in UCS 4.4 as well

+++ This bug was initially created as a clone of Bug #48536 +++

When snapshots are created and restored the <cpu model="host-model"/> placeholder is replaced by the concrete host-model; this persists even when the VM is powered down, which will prevent migration to hosts with older CPUs.
This can be fixed manually by running "virsh edit" and replacing the concrete model again with the placeholder. (This again will break with the next snapshot)

Even worse libvirt seems to contain a bug where for an powered off VM a flag is mentioned as required in the concrete CPU model with QEMU is not able to provide/emulate. The VM then cannot be started even on the same host where the snapshot war created. (that does not happen with all CPU models: 'krus' works, 'lattjo' seems to be broken.)

Comment 1 Erik Damrose

2019-05-07 16:54:02 CEST

Moved libvirt package from 4.3-4 to 4.4-0
cd75eb4 yaml

Patches migrated: svn/patches/libvirt/4.4-0-0-ucs/3.0.0-4+deb9u3-errata4.4-0

Comment 2 Arvid Requate

2019-05-07 18:49:43 CEST

Verified:
* This is required because http://errata.software-univention.de/ucs/4.3/269.html is also active in UCS 4.4
* Binary packages copied to release scope ucs_4.4-0-errata4.4-0
* Patches copied to 4.4-0-0-ucs/3.0.0-4+deb9u3-errata4.4-0/
* Package update: Ok
* Advisory: Ok

Comment 3 Arvid Requate

2019-05-08 13:26:24 CEST

<http://errata.software-univention.de/ucs/4.4/79.html>