[Bug 252768] bhyve UEFI com1,stdio console doubles as unsupported MSR logging console

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252768

            Bug ID: 252768
           Summary: bhyve UEFI com1,stdio console doubles as unsupported
                    MSR logging console
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: editor at callfortesting.org

If a bhyve UEFI-booted guest is launched with a com1,stdio console, that
console is useful as a system console on the VM, and in the case of Windows
Server, the SAC management console.

Unfortunately, the com1,stdio console receives various error reporting from
bhyve, including keyboard/mouse and "rdmsr to register" notifications.

Workaround: Use an nmdm or pty console device

Desirable solution: Proper bhyve logging to a mechanism such as one or more log
files or syslog.

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