I rechecked the flags and it seems that the new CPU have't support for
TSX
virsh domcapabilities |grep "Skylake"
<model usable='yes'>Skylake-Server-noTSX-IBRS</model>
<model usable='no'>Skylake-Server-IBRS</model>
<model usable='no'>Skylake-Server</model>
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https://bugs.launchpad.net/bugs/1922907
Title:
Unable to use Skylake capability on Cascadelake server
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