Bug 252768 - bhyve UEFI com1,stdio console doubles as unsupported MSR logging console
Summary: bhyve UEFI com1,stdio console doubles as unsupported MSR logging console
Status: Closed Works As Intended
Alias: None
Product: Base System
Classification: Unclassified
Component: bhyve (show other bugs)
Version: CURRENT
Hardware: amd64 Any
: --- Affects Some People
Assignee: freebsd-virtualization (Nobody)
Depends on:
Reported: 2021-01-17 09:34 UTC by Michael Dexter
Modified: 2021-01-18 19:35 UTC (History)
1 user (show)

See Also:


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Description Michael Dexter 2021-01-17 09:34:23 UTC
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.
Comment 1 Aleksandr Fedorov freebsd_committer 2021-01-18 18:19:50 UTC
I'm not sure if this is a bug. Bhyve, as a usual utility, displays the stderr on the terminal. Therefore, you can simply redirect stderr output to a file.

# bhyve ... -l com1,stdio ... 2>vmerr.log
# cat vmerr.log 
rdmsr to register 0x4e on vcpu 0
rdmsr to register 0x34 on vcpu 0
wrmsr to register 0xc8f(0) on vcpu 0
Unhandled ps2 mouse command 0xe1
Unhandled ps2 mouse command 0x88
Unhandled ps2 keyboard command 0xf6
Comment 2 Michael Dexter 2021-01-18 19:35:07 UTC
That workaround is preferable to every suggestion to date.
I don't know if grehan@ requested a ticket for another reason but I will mark this as resolved.