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

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

Michael Dexter-2
Hello all,

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?

Thank you!

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

Michael Dexter-2
On 1/17/21 1:21 AM, Peter Grehan wrote:

>> 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.

PR filed and indeed!

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

All the best,

Michael
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