Public bug reported:

As of 5.4.0-0ubuntu5 on Ubuntu 19.10 x86_64, available CPU model
selection as I can see from virt-manager is still missing some CPU
models.  Here's some info based on running "virsh capabilities"

Host: Lenovo L470 (UEFI=1.71), i3-7100u ==> I cannot select SkyLake-whatever in 
virt-manager as it is detected as Broadwell
    <cpu>
      <arch>x86_64</arch>
      <model>Broadwell-noTSX-IBRS</model>
      <vendor>Intel</vendor>
      <microcode version='202'/>
      <topology sockets='1' cores='2' threads='2'/>
      <feature name='vme'/>
      <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='est'/>
      <feature name='tm2'/>
      <feature name='xtpr'/>
      <feature name='pdcm'/>
      <feature name='osxsave'/>
      <feature name='f16c'/>
      <feature name='rdrand'/>
      <feature name='arat'/>
      <feature name='tsc_adjust'/>
      <feature name='mpx'/>
      <feature name='clflushopt'/>
      <feature name='intel-pt'/>
      <feature name='md-clear'/>
      <feature name='stibp'/>
      <feature name='ssbd'/>
      <feature name='xsaveopt'/>
      <feature name='xsavec'/>
      <feature name='xgetbv1'/>
      <feature name='xsaves'/>
      <feature name='pdpe1gb'/>
      <feature name='abm'/>
      <feature name='invtsc'/>
      <pages unit='KiB' size='4'/>
      <pages unit='KiB' size='2048'/>
      <pages unit='KiB' size='1048576'/>
    </cpu>

ASRock B450M Pro (UEFI 3.90), Ryzen 3600 ==> no CPU model is available for 
selection in virt-manager, and I have to use <cpu mode='host-model' 
check='partial'> at the moment, really not preferred.
    <cpu>
      <arch>x86_64</arch>
      <model>EPYC-IBPB</model>
      <vendor>AMD</vendor>
      <microcode version='141561875'/>
      <topology sockets='1' cores='6' threads='2'/>
      <feature name='ht'/>
      <feature name='osxsave'/>
      <feature name='cmt'/>
      <feature name='clwb'/>
      <feature name='umip'/>
      <feature name='xsaves'/>
      <feature name='mbm_total'/>
      <feature name='mbm_local'/>
      <feature name='cmp_legacy'/>
      <feature name='extapic'/>
      <feature name='ibs'/>
      <feature name='skinit'/>
      <feature name='wdt'/>
      <feature name='tce'/>
      <feature name='topoext'/>
      <feature name='perfctr_core'/>
      <feature name='perfctr_nb'/>
      <feature name='invtsc'/>
      <feature name='wbnoinvd'/>
      <feature name='amd-ssbd'/>
      <pages unit='KiB' size='4'/>
      <pages unit='KiB' size='2048'/>
      <pages unit='KiB' size='1048576'/>
    </cpu>

Expected: CPU model <= host CPU model should be selectable.  in case of
i3-7100u, it means SkyLake-Client should be available;  in case of Ryzen
3600, at least EPYC should be available.

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

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https://bugs.launchpad.net/bugs/1861643

Title:
  libvirt CPU model selection missing

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