Comment 17 for bug 1921880

TL;DR
- I was able to confirm Markus test results
- results LGTM (other than a few hickups probably due to my special HW)
- a few questions to Markus (see below)
- With these positive resilts I'd already go on and combine this with
  another SRU to prep merge proposals for F/G/H.
- Once ready and reviewed it will depend on the timing how exactly we
  upload - and then - verify it again

@Markus - Just to be sure on these details let me ask
A)
 - with EPYC-Milan / EPYC-Rome(-v2) types are for you the MSR errors gone on your Chips?
 - Or only when you manually add IBRS and/or other things?
B)
 - since you have multiple EPYC chip types - when the time comes for
   this to become an SRU can I count on you to help test this again
   (in multiple releases)?

C) in https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1921754/comments/7
   you said you had these MSR errors on "5.4.0-70 on both host and guest"
   with 5.4.0-71-generic (current). I don't see them. And the fix isn't there
   yet as the kernel bug will only be resolved the next kernel update.
   Therefore - did you really see this with the guest on 5.4 or was this
   a mistake?