this does seem to affect ubuntu 18.04 (bionic beaver) as well, meaning
it's not possible to host guest vms with the IBRS Security Flag:
qemu-system-x86_64 -cpu ? | grep EPYC-Rome
is empty
dpkg -l qemu-system
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version
Architecture Description
+++-=====================================================-===============================-===============================-===============================================================================================================
ii qemu-system 1:4.0+dfsg-0ubuntu9.8
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https://bugs.launchpad.net/bugs/1921754
Title:
Add missing cpu feature bits in EPYC-Rome model
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