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[birbilakos <2049231@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2049231

Title:
  Nova fails to live migrate VMs even though source and destination
  hosts are the same

Status in OpenStack Compute (nova):
  New
Status in nova-lxd:
  New

Bug description:
  I'm using ansible-openstack 2023.2 installation. Testing out the live
  migration feature via horizon, it fails to do the migration on
  identically spec'ed source and destination hosts:

  Error: Failed to live migrate instance to host "sjc-lnxserver-136".
  Details

  Migration pre-check error: Unacceptable CPU info: CPU doesn't have
  compatibility. 0 Refer to http://libvirt.org/html/libvirt-libvirt-
  host.html#virCPUCompareResult (HTTP 400) (Request-ID: req-a5ce90ec-
  bbd3-4130-b868-592897759b68)

  virsh caps is practically the same (expect the reported frequency) across both source and destination.
      <cpu>
        <arch>x86_64</arch>
        <model>Cascadelake-Server-noTSX</model>
        <vendor>Intel</vendor>
        <microcode version='83899908'/>
        <counter name='tsc' frequency='3591521000' scaling='yes'/>
        <topology sockets='1' dies='1' cores='8' threads='2'/>
        <feature name='ds'/>
        <feature name='acpi'/>
        <feature name='ss'/>
        <feature name='ht'/>
        <feature name='tm'/>
        <feature name='pbe'/>
        <feature name='dtes64'/>
        <feature name='monitor'/>
        <feature name='ds_cpl'/>
        <feature name='vmx'/>
        <feature name='smx'/>
        <feature name='est'/>
        <feature name='tm2'/>
        <feature name='xtpr'/>
        <feature name='pdcm'/>
        <feature name='dca'/>
        <feature name='osxsave'/>
        <feature name='tsc_adjust'/>
        <feature name='cmt'/>
        <feature name='intel-pt'/>
        <feature name='pku'/>
        <feature name='ospke'/>
        <feature name='md-clear'/>
        <feature name='stibp'/>
        <feature name='arch-capabilities'/>
        <feature name='xsaves'/>
        <feature name='mbm_total'/>
        <feature name='mbm_local'/>
        <feature name='invtsc'/>
        <feature name='rdctl-no'/>
        <feature name='ibrs-all'/>
        <feature name='skip-l1dfl-vmentry'/>
        <feature name='mds-no'/>
        <feature name='tsx-ctrl'/>
        <pages unit='KiB' size='4'/>
        <pages unit='KiB' size='2048'/>
        <pages unit='KiB' size='1048576'/>
      </cpu>

  Any ideas?

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