UEFI -l com1, stdio floods console/Windows Server SAC with "rdmsr to register 0x198 on vcpu..."

[Peter Grehan]

> Can the "rdmsr to register 0x198 on vcpu..." and similar messages on a 
> -l com1,stdio console when using UEFI firmware be redirected or 
> suppressed? The -w flag does not silence them, assuming, perhaps 
> incorrectly, they are unsupported MSRs.
> 
> If redirected, should these be logged?

  Please file a PR (https://www.freebsd.org/support/bugreports.html)

  A simple workaround is to use an nmdm or pty device for com1 output.

later,

Peter.