Public bug reported:

Basic problem - unable to permanently edit snapshot machine types.

After upgrading from Ubuntu 18.04 to 18.10 snapshots no longer work with
machine type zesty.

You can restore snapshot, edit machine type and then run, but cannot
alter the snapshot machine type itself.

Snapshots were taken with shutdown state using virt-manager

The below was using virsh but same behaviour using virt-manager.


rich@ubuntu:/etc/libvirt/qemu$ qemu-system-x86_64 -machine help
Supported machines are:
pc-i440fx-xenial     Ubuntu 16.04 PC (i440FX + PIIX, 1996)
pc-i440fx-wily       Ubuntu 15.04 PC (i440FX + PIIX, 1996)
pc-i440fx-trusty     Ubuntu 14.04 PC (i440FX + PIIX, 1996)
ubuntu               Ubuntu 18.10 PC (i440FX + PIIX, 1996) (alias of 
pc-i440fx-cosmic)
pc-i440fx-cosmic     Ubuntu 18.10 PC (i440FX + PIIX, 1996) (default)
pc-i440fx-cosmic-hpb Ubuntu 18.10 PC (i440FX + PIIX +host-phys-bits=true, 1996)
pc-i440fx-bionic     Ubuntu 18.04 PC (i440FX + PIIX, 1996)
pc-i440fx-bionic-hpb Ubuntu 18.04 PC (i440FX + PIIX, +host-phys-bits=true, 1996)
pc-i440fx-artful     Ubuntu 17.10 PC (i440FX + PIIX, 1996)

<snip>


rich@ubuntu:/etc/libvirt/qemu$ virsh snapshot-list Windows_7_x64_GS
 Name                 Creation Time             State
------------------------------------------------------------
 office2013 installed 16-May-2017 2017-05-08 14:04:30 +0100 shutoff
 updated to 8-feb-2017 2017-05-08 14:04:30 +0100 shutoff


rich@ubuntu:/etc/libvirt/qemu$ virsh snapshot-revert Windows_7_x64_GS 
"office2013 installed 16-May-2017"

rich@ubuntu:/etc/libvirt/qemu$ virsh start Windows_7_x64_GS 
error: Failed to start domain Windows_7_x64_GS
error: internal error: process exited while connecting to monitor: 
2018-11-12T15:18:04.506728Z qemu-system-x86_64: -enable-kvm: unsupported 
machine type 'pc-i440fx-zesty'
Use -machine help to list supported machines
The machine type is old and out of support now
Please study https://wiki.ubuntu.com/QemuKVMMigration#Upgrade_machine_type how 
toupgrade machine types

rich@ubuntu:/etc/libvirt/qemu$ virsh snapshot-edit Windows_7_x64_GS 
--snapshotname "office2013 installed 16-May-2017"
error: unsupported configuration: Target domain machine type pc-i440fx-cosmic 
does not match source pc-i440fx-zesty
Failed. Try again? [y,n,f,?]: 
error: Failed to update office2013 installed 16-May-2017
error: unsupported configuration: Target domain machine type pc-i440fx-cosmic 
does not match source pc-i440fx-zesty

 ****** edited from zesty to cosmic here, now accepts *******

rich@ubuntu:/etc/libvirt/qemu$ virsh edit Windows_7_x64_GS 
Domain Windows_7_x64_GS XML configuration edited.

rich@ubuntu:/etc/libvirt/qemu$ virsh start Windows_7_x64_GS 
Domain Windows_7_x64_GS started


rich@ubuntu:/etc/libvirt/qemu$ virsh snapshot-revert Windows_7_x64_GS
"office2013 installed 16-May-2017"

rich@ubuntu:/etc/libvirt/qemu$ virsh start Windows_7_x64_GS 
error: Failed to start domain Windows_7_x64_GS
error: internal error: process exited while connecting to monitor: 
2018-11-12T15:19:45.021899Z qemu-system-x86_64: -enable-kvm: unsupported 
machine type 'pc-i440fx-zesty'
Use -machine help to list supported machines
The machine type is old and out of support now
Please study https://wiki.ubuntu.com/QemuKVMMigration#Upgrade_machine_type how 
toupgrade machine types

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: qemu-system-x86 1:2.12+dfsg-3ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Nov 12 15:26:49 2018
InstallationDate: Installed on 2018-06-07 (158 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
KvmCmdLine: COMMAND         STAT  EUID  RUID   PID  PPID %CPU COMMAND
MachineType: Hewlett-Packard HP Compaq 8200 Elite CMT PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-10-generic 
root=UUID=b54834ed-79ec-4ea0-bf2a-4ec66d71ae98 ro quiet splash vt.handoff=1
SourcePackage: qemu
UpgradeStatus: Upgraded to cosmic on 2018-10-22 (21 days ago)
dmi.bios.date: 02/14/2018
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: J01 v02.31
dmi.board.asset.tag: CZC2280K7Z
dmi.board.name: 1494
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC2280K7Z
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrJ01v02.31:bd02/14/2018:svnHewlett-Packard:pnHPCompaq8200EliteCMTPC:pvr:rvnHewlett-Packard:rn1494:rvr:cvnHewlett-Packard:ct6:cvr:
dmi.product.family: 103C_53307F G=D
dmi.product.name: HP Compaq 8200 Elite CMT PC
dmi.product.sku: XL508AV
dmi.sys.vendor: Hewlett-Packard

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: cosmic

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https://bugs.launchpad.net/bugs/1802944

Title:
  error: unsupported configuration: Target domain machine type

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