On RHEL 9.2 EUS, hypervisor-cpu-baseline returns Haswell when a Cascade Lake and Ice Lake CPUs are used.   We can't migrate guests from Ice Lake to Cacade Lake hosts with nova/libvirt.

[root@leaf1-compute1 /]# virsh hypervisor-cpu-baseline both_cpus
<cpu mode='custom' match='exact'>
  <model fallback='forbid'>Haswell-noTSX-IBRS</model>
  <vendor>Intel</vendor>
  <feature policy='require' name='vme'/>
  <feature policy='require' name='ss'/>
  <feature policy='require' name='vmx'/>
  <feature policy='require' name='pdcm'/>
  <feature policy='require' name='f16c'/>
  <feature policy='require' name='rdrand'/>
  <feature policy='require' name='hypervisor'/>
  <feature policy='require' name='arat'/>
  <feature policy='require' name='tsc_adjust'/>
  <feature policy='require' name='umip'/>
  <feature policy='require' name='md-clear'/>
  <feature policy='require' name='stibp'/>
  <feature policy='require' name='arch-capabilities'/>
  <feature policy='require' name='ssbd'/>
  <feature policy='require' name='xsaveopt'/>
  <feature policy='require' name='xsaves'/>
  <feature policy='require' name='pdpe1gb'/>
  <feature policy='require' name='abm'/>
  <feature policy='require' name='invtsc'/>
  <feature policy='require' name='ibpb'/>
  <feature policy='require' name='ibrs'/>
  <feature policy='require' name='amd-stibp'/>
  <feature policy='require' name='amd-ssbd'/>
  <feature policy='require' name='rdctl-no'/>
  <feature policy='require' name='ibrs-all'/>
  <feature policy='require' name='skip-l1dfl-vmentry'/>
  <feature policy='require' name='mds-no'/>
  <feature policy='require' name='pschange-mc-no'/>
  <feature policy='require' name='tsx-ctrl'/>
</cpu>

LAKE04 --> Existing

[root@cascadelake /]# virsh domcapabilities
<domainCapabilities>
  <path>/usr/libexec/qemu-kvm</path>
  <domain>kvm</domain>
  <machine>pc-i440fx-rhel7.6.0</machine>
  <arch>x86_64</arch>
  <vcpu max='240'/>
  <iothreads supported='yes'/>
  <os supported='yes'>
    <enum name='firmware'/>
    <loader supported='yes'>
      <value>/usr/share/OVMF/OVMF_CODE.secboot.fd</value>
      <enum name='type'>
        <value>rom</value>
        <value>pflash</value>
      </enum>
      <enum name='readonly'>
        <value>yes</value>
        <value>no</value>
      </enum>
      <enum name='secure'>
        <value>no</value>
      </enum>
    </loader>
  </os>
  <cpu>
    <mode name='host-passthrough' supported='yes'>
      <enum name='hostPassthroughMigratable'>
        <value>on</value>
        <value>off</value>
      </enum>
    </mode>
    <mode name='maximum' supported='yes'>
      <enum name='maximumMigratable'>
        <value>on</value>
        <value>off</value>
      </enum>
    </mode>
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Cascadelake-Server</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='pdcm'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='umip'/>
      <feature policy='require' name='pku'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='arch-capabilities'/>
      <feature policy='require' name='xsaves'/>
      <feature policy='require' name='invtsc'/>
      <feature policy='require' name='ibpb'/>
      <feature policy='require' name='ibrs'/>
      <feature policy='require' name='amd-stibp'/>
      <feature policy='require' name='amd-ssbd'/>
      <feature policy='require' name='rdctl-no'/>
      <feature policy='require' name='ibrs-all'/>
      <feature policy='require' name='skip-l1dfl-vmentry'/>
      <feature policy='require' name='mds-no'/>
      <feature policy='require' name='pschange-mc-no'/>
      <feature policy='require' name='tsx-ctrl'/>
      <feature policy='disable' name='hle'/>
      <feature policy='disable' name='rtm'/>
    </mode>
    <mode name='custom' supported='yes'>
      <model usable='yes' deprecated='yes' vendor='unknown'>qemu64</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>qemu32</model>
      <model usable='no' deprecated='yes' vendor='AMD'>phenom</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>pentium3</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>pentium2</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>pentium</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>n270</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>kvm64</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>kvm32</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>coreduo</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>core2duo</model>
      <model usable='no' deprecated='yes' vendor='AMD'>athlon</model>
      <model usable='yes' vendor='Intel'>Westmere-IBRS</model>
      <model usable='yes' vendor='Intel'>Westmere</model>
      <model usable='no' vendor='Intel'>Snowridge</model>
      <model usable='yes' vendor='Intel'>Skylake-Server-noTSX-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Server-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Server</model>
      <model usable='yes' vendor='Intel'>Skylake-Client-noTSX-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Client-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Client</model>
      <model usable='no' vendor='Intel'>SapphireRapids</model>
      <model usable='yes' vendor='Intel'>SandyBridge-IBRS</model>
      <model usable='yes' vendor='Intel'>SandyBridge</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>Penryn</model>
      <model usable='no' vendor='AMD'>Opteron_G5</model>
      <model usable='no' vendor='AMD'>Opteron_G4</model>
      <model usable='no' deprecated='yes' vendor='AMD'>Opteron_G3</model>
      <model usable='yes' deprecated='yes' vendor='AMD'>Opteron_G2</model>
      <model usable='yes' deprecated='yes' vendor='AMD'>Opteron_G1</model>
      <model usable='yes' vendor='Intel'>Nehalem-IBRS</model>
      <model usable='yes' vendor='Intel'>Nehalem</model>
      <model usable='yes' vendor='Intel'>IvyBridge-IBRS</model>
      <model usable='yes' vendor='Intel'>IvyBridge</model>
      <model usable='no' vendor='Intel'>Icelake-Server-noTSX</model>
      <model usable='no' vendor='Intel'>Icelake-Server</model>
      <model usable='yes' vendor='Intel'>Haswell-noTSX-IBRS</model>
      <model usable='yes' vendor='Intel'>Haswell-noTSX</model>
      <model usable='no' vendor='Intel'>Haswell-IBRS</model>
      <model usable='no' vendor='Intel'>Haswell</model>
      <model usable='no' vendor='AMD'>EPYC-Rome</model>
      <model usable='no' vendor='AMD'>EPYC-Milan</model>
      <model usable='no' vendor='AMD'>EPYC-IBPB</model>
      <model usable='no' vendor='AMD'>EPYC-Genoa</model>
      <model usable='no' vendor='AMD'>EPYC</model>
      <model usable='no' vendor='Hygon'>Dhyana</model>
      <model usable='no' vendor='Intel'>Cooperlake</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>Conroe</model>
      <model usable='yes' vendor='Intel'>Cascadelake-Server-noTSX</model>
      <model usable='no' vendor='Intel'>Cascadelake-Server</model>
      <model usable='yes' vendor='Intel'>Broadwell-noTSX-IBRS</model>
      <model usable='yes' vendor='Intel'>Broadwell-noTSX</model>
      <model usable='no' vendor='Intel'>Broadwell-IBRS</model>
      <model usable='no' vendor='Intel'>Broadwell</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>486</model>
    </mode>
  </cpu>
  <memoryBacking supported='yes'>
    <enum name='sourceType'>
      <value>file</value>
      <value>anonymous</value>
      <value>memfd</value>
    </enum>
  </memoryBacking>
  <devices>
    <disk supported='yes'>
      <enum name='diskDevice'>
        <value>disk</value>
        <value>cdrom</value>
        <value>floppy</value>
        <value>lun</value>
      </enum>
      <enum name='bus'>
        <value>ide</value>
        <value>fdc</value>
        <value>scsi</value>
        <value>virtio</value>
        <value>usb</value>
        <value>sata</value>
      </enum>
      <enum name='model'>
        <value>virtio</value>
        <value>virtio-transitional</value>
        <value>virtio-non-transitional</value>
      </enum>
    </disk>
    <graphics supported='yes'>
      <enum name='type'>
        <value>vnc</value>
        <value>egl-headless</value>
      </enum>
    </graphics>
    <video supported='yes'>
      <enum name='modelType'>
        <value>vga</value>
        <value>cirrus</value>
        <value>virtio</value>
        <value>none</value>
        <value>bochs</value>
        <value>ramfb</value>
      </enum>
    </video>
    <hostdev supported='yes'>
      <enum name='mode'>
        <value>subsystem</value>
      </enum>
      <enum name='startupPolicy'>
        <value>default</value>
        <value>mandatory</value>
        <value>requisite</value>
        <value>optional</value>
      </enum>
      <enum name='subsysType'>
        <value>usb</value>
        <value>pci</value>
        <value>scsi</value>
      </enum>
      <enum name='capsType'/>
      <enum name='pciBackend'/>
    </hostdev>
    <rng supported='yes'>
      <enum name='model'>
        <value>virtio</value>
        <value>virtio-transitional</value>
        <value>virtio-non-transitional</value>
      </enum>
      <enum name='backendModel'>
        <value>random</value>
        <value>egd</value>
        <value>builtin</value>
      </enum>
    </rng>
    <filesystem supported='yes'>
      <enum name='driverType'>
        <value>path</value>
        <value>handle</value>
        <value>virtiofs</value>
      </enum>
    </filesystem>
    <tpm supported='yes'>
      <enum name='model'>
        <value>tpm-tis</value>
        <value>tpm-crb</value>
      </enum>
      <enum name='backendModel'>
        <value>emulator</value>
        <value>external</value>
      </enum>
      <enum name='backendVersion'>
        <value>2.0</value>
      </enum>
    </tpm>
    <redirdev supported='yes'>
      <enum name='bus'>
        <value>usb</value>
      </enum>
    </redirdev>
    <channel supported='yes'>
      <enum name='type'>
        <value>pty</value>
        <value>unix</value>
      </enum>
    </channel>
  </devices>
  <features>
    <gic supported='no'/>
    <vmcoreinfo supported='yes'/>
    <genid supported='yes'/>
    <backingStoreInput supported='yes'/>
    <backup supported='yes'/>
    <sev supported='no'/>
    <sgx supported='no'/>
    <hyperv supported='yes'>
      <enum name='features'>
        <value>relaxed</value>
        <value>vapic</value>
        <value>spinlocks</value>
        <value>vpindex</value>
        <value>runtime</value>
        <value>synic</value>
        <value>stimer</value>
        <value>reset</value>
        <value>vendor_id</value>
        <value>frequencies</value>
        <value>reenlightenment</value>
        <value>tlbflush</value>
        <value>ipi</value>
        <value>evmcs</value>
        <value>avic</value>
      </enum>
    </hyperv>
  </features>
</domainCapabilities>

[root@icelake /]#

LAKE14 --> New Node

[root@icelake /]# virsh domcapabilities
<domainCapabilities>
  <path>/usr/libexec/qemu-kvm</path>
  <domain>kvm</domain>
  <machine>pc-i440fx-rhel7.6.0</machine>
  <arch>x86_64</arch>
  <vcpu max='240'/>
  <iothreads supported='yes'/>
  <os supported='yes'>
    <enum name='firmware'/>
    <loader supported='yes'>
      <value>/usr/share/OVMF/OVMF_CODE.secboot.fd</value>
      <enum name='type'>
        <value>rom</value>
        <value>pflash</value>
      </enum>
      <enum name='readonly'>
        <value>yes</value>
        <value>no</value>
      </enum>
      <enum name='secure'>
        <value>no</value>
      </enum>
    </loader>
  </os>
  <cpu>
    <mode name='host-passthrough' supported='yes'>
      <enum name='hostPassthroughMigratable'>
        <value>on</value>
        <value>off</value>
      </enum>
    </mode>
    <mode name='maximum' supported='yes'>
      <enum name='maximumMigratable'>
        <value>on</value>
        <value>off</value>
      </enum>
    </mode>
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Icelake-Server</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='ds'/>
      <feature policy='require' name='ss'/>
      <feature policy='require' name='dtes64'/>
      <feature policy='require' name='vmx'/>
      <feature policy='require' name='pdcm'/>
      <feature policy='require' name='hypervisor'/>
      <feature policy='require' name='tsc_adjust'/>
      <feature policy='require' name='avx512ifma'/>
      <feature policy='require' name='sha-ni'/>
      <feature policy='require' name='rdpid'/>
      <feature policy='require' name='fsrm'/>
      <feature policy='require' name='md-clear'/>
      <feature policy='require' name='stibp'/>
      <feature policy='require' name='arch-capabilities'/>
      <feature policy='require' name='xsaves'/>
      <feature policy='require' name='invtsc'/>
      <feature policy='require' name='ibpb'/>
      <feature policy='require' name='ibrs'/>
      <feature policy='require' name='amd-stibp'/>
      <feature policy='require' name='amd-ssbd'/>
      <feature policy='require' name='rdctl-no'/>
      <feature policy='require' name='ibrs-all'/>
      <feature policy='require' name='skip-l1dfl-vmentry'/>
      <feature policy='require' name='mds-no'/>
      <feature policy='require' name='pschange-mc-no'/>
      <feature policy='require' name='tsx-ctrl'/>
      <feature policy='disable' name='hle'/>
      <feature policy='disable' name='rtm'/>
      <feature policy='disable' name='mpx'/>
      <feature policy='disable' name='intel-pt'/>
    </mode>
    <mode name='custom' supported='yes'>
      <model usable='yes' deprecated='yes' vendor='unknown'>qemu64</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>qemu32</model>
      <model usable='no' deprecated='yes' vendor='AMD'>phenom</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>pentium3</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>pentium2</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>pentium</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>n270</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>kvm64</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>kvm32</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>coreduo</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>core2duo</model>
      <model usable='no' deprecated='yes' vendor='AMD'>athlon</model>
      <model usable='yes' vendor='Intel'>Westmere-IBRS</model>
      <model usable='yes' vendor='Intel'>Westmere</model>
      <model usable='no' vendor='Intel'>Snowridge</model>
      <model usable='yes' vendor='Intel'>Skylake-Server-noTSX-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Server-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Server</model>
      <model usable='yes' vendor='Intel'>Skylake-Client-noTSX-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Client-IBRS</model>
      <model usable='no' vendor='Intel'>Skylake-Client</model>
      <model usable='no' vendor='Intel'>SapphireRapids</model>
      <model usable='yes' vendor='Intel'>SandyBridge-IBRS</model>
      <model usable='yes' vendor='Intel'>SandyBridge</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>Penryn</model>
      <model usable='no' vendor='AMD'>Opteron_G5</model>
      <model usable='no' vendor='AMD'>Opteron_G4</model>
      <model usable='no' deprecated='yes' vendor='AMD'>Opteron_G3</model>
      <model usable='yes' deprecated='yes' vendor='AMD'>Opteron_G2</model>
      <model usable='yes' deprecated='yes' vendor='AMD'>Opteron_G1</model>
      <model usable='yes' vendor='Intel'>Nehalem-IBRS</model>
      <model usable='yes' vendor='Intel'>Nehalem</model>
      <model usable='yes' vendor='Intel'>IvyBridge-IBRS</model>
      <model usable='yes' vendor='Intel'>IvyBridge</model>
      <model usable='yes' vendor='Intel'>Icelake-Server-noTSX</model>
      <model usable='no' vendor='Intel'>Icelake-Server</model>
      <model usable='yes' vendor='Intel'>Haswell-noTSX-IBRS</model>
      <model usable='yes' vendor='Intel'>Haswell-noTSX</model>
      <model usable='no' vendor='Intel'>Haswell-IBRS</model>
      <model usable='no' vendor='Intel'>Haswell</model>
      <model usable='no' vendor='AMD'>EPYC-Rome</model>
      <model usable='no' vendor='AMD'>EPYC-Milan</model>
      <model usable='no' vendor='AMD'>EPYC-IBPB</model>
      <model usable='no' vendor='AMD'>EPYC-Genoa</model>
      <model usable='no' vendor='AMD'>EPYC</model>
      <model usable='no' vendor='Hygon'>Dhyana</model>
      <model usable='no' vendor='Intel'>Cooperlake</model>
      <model usable='yes' deprecated='yes' vendor='Intel'>Conroe</model>
      <model usable='yes' vendor='Intel'>Cascadelake-Server-noTSX</model>
      <model usable='no' vendor='Intel'>Cascadelake-Server</model>
      <model usable='yes' vendor='Intel'>Broadwell-noTSX-IBRS</model>
      <model usable='yes' vendor='Intel'>Broadwell-noTSX</model>
      <model usable='no' vendor='Intel'>Broadwell-IBRS</model>
      <model usable='no' vendor='Intel'>Broadwell</model>
      <model usable='yes' deprecated='yes' vendor='unknown'>486</model>
    </mode>
  </cpu>
  <memoryBacking supported='yes'>
    <enum name='sourceType'>
      <value>file</value>
      <value>anonymous</value>
      <value>memfd</value>
    </enum>
  </memoryBacking>
  <devices>
    <disk supported='yes'>
      <enum name='diskDevice'>
        <value>disk</value>
        <value>cdrom</value>
        <value>floppy</value>
        <value>lun</value>
      </enum>
      <enum name='bus'>
        <value>ide</value>
        <value>fdc</value>
        <value>scsi</value>
        <value>virtio</value>
        <value>usb</value>
        <value>sata</value>
      </enum>
      <enum name='model'>
        <value>virtio</value>
        <value>virtio-transitional</value>
        <value>virtio-non-transitional</value>
      </enum>
    </disk>
    <graphics supported='yes'>
      <enum name='type'>
        <value>vnc</value>
        <value>egl-headless</value>
      </enum>
    </graphics>
    <video supported='yes'>
      <enum name='modelType'>
        <value>vga</value>
        <value>cirrus</value>
        <value>virtio</value>
        <value>none</value>
        <value>bochs</value>
        <value>ramfb</value>
      </enum>
    </video>
    <hostdev supported='yes'>
      <enum name='mode'>
        <value>subsystem</value>
      </enum>
      <enum name='startupPolicy'>
        <value>default</value>
        <value>mandatory</value>
        <value>requisite</value>
        <value>optional</value>
      </enum>
      <enum name='subsysType'>
        <value>usb</value>
        <value>pci</value>
        <value>scsi</value>
      </enum>
      <enum name='capsType'/>
      <enum name='pciBackend'/>
    </hostdev>
    <rng supported='yes'>
      <enum name='model'>
        <value>virtio</value>
        <value>virtio-transitional</value>
        <value>virtio-non-transitional</value>
      </enum>
      <enum name='backendModel'>
        <value>random</value>
        <value>egd</value>
        <value>builtin</value>
      </enum>
    </rng>
    <filesystem supported='yes'>
      <enum name='driverType'>
        <value>path</value>
        <value>handle</value>
        <value>virtiofs</value>
      </enum>
    </filesystem>
    <tpm supported='yes'>
      <enum name='model'>
        <value>tpm-tis</value>
        <value>tpm-crb</value>
      </enum>
      <enum name='backendModel'>
        <value>emulator</value>
        <value>external</value>
      </enum>
      <enum name='backendVersion'>
        <value>2.0</value>
      </enum>
    </tpm>
    <redirdev supported='yes'>
      <enum name='bus'>
        <value>usb</value>
      </enum>
    </redirdev>
    <channel supported='yes'>
      <enum name='type'>
        <value>pty</value>
        <value>unix</value>
      </enum>
    </channel>
  </devices>
  <features>
    <gic supported='no'/>
    <vmcoreinfo supported='yes'/>
    <genid supported='yes'/>
    <backingStoreInput supported='yes'/>
    <backup supported='yes'/>
    <sev supported='no'/>
    <sgx supported='no'/>
    <hyperv supported='yes'>
      <enum name='features'>
        <value>relaxed</value>
        <value>vapic</value>
        <value>spinlocks</value>
        <value>vpindex</value>
        <value>runtime</value>
        <value>synic</value>
        <value>stimer</value>
        <value>reset</value>
        <value>vendor_id</value>
        <value>frequencies</value>
        <value>reenlightenment</value>
        <value>tlbflush</value>
        <value>ipi</value>
        <value>evmcs</value>
        <value>avic</value>
      </enum>
    </hyperv>
  </features>
</domainCapabilities>