Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens

[Salvatore Bonaccorso <carnil@debian.org>]

Control: tags -1 + moreinfo

Hi

On Thu, Oct 03, 2019 at 09:24:26AM +0100, Anton Ivanov wrote:
> Package: src:linux
> Version: 4.19.67-2+deb10u1
> Severity: important
> 
> Dear Maintainer,
> 
> noht has no effect.
> 
> I have been trying to chase down a weird hang which occurs only on 6
> core/12 thread Ryzens (I cannot reproduce it on 4/8 or older CPUs).
> 
> As a part of that I tried to disable ht. Well, it cannot be disabled
> - the noht command line arg has no effect whatosever.
> 
> As ht can be a security hole this may have security implications as
> well.

Do you mean 'nosmt'? (See kernel-parameters.txt).

You can find further information as well in
Documentation/admin-guide/hw-vuln/l1tf.rst.

Regards,
Salvatore