[MODERATED] Re: [PATCH v5 08/11] TAAv5 8

On Tue, 15 Oct 2019, speck for Pawan Gupta wrote:

> tsx_ctrl_is_supported() checks for the TSX_CTRL MSR support and then 
> only attempts at disabling TSX. MDS_NO=0 CPUs will not get the ucode 
> update for TSX control, therefore tsx=auto wont cause regression on 
> older CPUs.

OK, that piece of information finally made it to make sense again :)

So I believe distros still want the option (Michal's patch) to default to 
'auto', so that actual heavy users of TSX will get the right thing once 
they update their CPUs to !TAA_BUG ones, but it's less urgent that I 
originally thought.

Thanks,

-- 
Jiri Kosina
SUSE Labs