Hi to all, we have the same problem.

we are tryng to migrate some VM from:

qemu 6.1 /libvirt 7.8

to

qemu 6.0 /libvirt 7.10

We cannot maintain qemu61, because one of this vm crash on snapshot remove.

How can we have a stable version of quemu(6.0?) and the live migrate functionality?


Il 16/12/2021 12:13, Sandro Bonazzola ha scritto:
+Arik Hadas can you suggest a workaround here? Giving context:

4.4.9.1 shipped qemu-kvm 6.1 and libvirt 7.9.0
4.4.9.2 downgraded qemu-kvm to 6.0 due to pcie bug
4.4.9.3 upgraded libvirt to 7.10 as it was released in CentOS Stream.

So it seems a migration problem between 6.1/7.9 -> 6.0/7.10

qemu-kvm 6.2 got released upstream https://www.qemu.org/2021/12/14/qemu-6-2-0/ but it's not yet available in CentOS Stream.

Il giorno gio 16 dic 2021 alle ore 11:52 Giulio Casella <giulio@di.unimi.it> ha scritto:
Hi guys,
I just faced a problem after updating a host. I cannot migrate VM to
updated host.
Here's the error I see trying to migrate a VM to that host.

Dec 16 10:13:11 host01.ovn.di.unimi.it systemd[1]: Starting Network
Manager Script Dispatcher Service...
Dec 16 10:13:11 host01.ovn.di.unimi.it libvirtd[5667]: Unable to read
from monitor: Connection reset by peer
Dec 16 10:13:11 host01.ovn.di.unimi.it libvirtd[5667]: internal error:
qemu unexpectedly closed the monitor: 2021-12-16T10:13:00.447480Z
qemu-kvm: -numa node,nodeid=0,cpus=0-15,mem=8192: warning: Parameter
-numa node,mem is deprecated, use -numa node,memdev instead

2021-12-16T10:13:11.158057Z qemu-kvm: Failed to load pckbd:kbd

2021-12-16T10:13:11.158114Z qemu-kvm: error while loading state for
instance 0x0 of device 'pckbd'

2021-12-16T10:13:11.158744Z qemu-kvm: load of migration failed: No such
file or directory
Dec 16 10:13:11 host01.ovn.xx.xxxxx.it kvm[35663]: 0 guests now active

Instead I can start VM on that host, and migrate away VM from that host.

Rolling back to ovirt-node-ng-4.4.9.1-0.20211207.0+1 via host console
restores full functionality.

The affected version is ovirt-node-ng-4.4.9.3-0.20211215.0+1 (and also
previous one, I don't remember precisely, it was another async release).


Any ideas?

TIA,
gc

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