id = 525
title = "missing features with CPU `qemu64`"
state = "closed"
created_at = "2021-08-13T07:34:25.731Z"
closed_at = "2022-04-06T14:40:40.259Z"
labels = ["Migration", "target: i386"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/525"
host-os = "Ubuntu 20.04"
host-arch = "x86_64"
qemu-version = "4.2.1 (Debian 1:4.2-3ubuntu6.17)"
guest-os = "Debian 10"
guest-arch = "x86_64"
description = """The live migration complains about a missing feature when using the CPU qemu64, which is _guaranteed to work_."""
reproduce = """1. start the VM with qemu64 on the CPU: Intel(R) Xeon(R) CPU E5-2620 v4 
2. live-migrate the VM to a CPU: Intel(R) Xeon(R) CPU E5-2670 0"""
additional = """The migration fails:
```
root@covid21:~# virsh migrate --verbose --live --persistent --undefinesource myvm.local qemu+ssh://covid24/system
error: operation failed: guest CPU doesn't match specification: missing features: abm
```

This should not happen on a generic CPU, which should always work. Note, that the migration succeeds when using `-cpu qemu64,abm=off …`"""