Re: [PATCH 4/4] x86/tsx: Add cmdline tsx=fake to not clear CPUID bits RTM and HLE

[Pawan Gupta]

On 11.06.2021 12:06, Borislav Petkov wrote:
> On Wed, Jun 09, 2021 at 02:14:39PM -0700, Pawan Gupta wrote:
> > On CPUs that deprecated TSX, clearing the enumeration bits CPUID.RTM and
> > CPUID.HLE may not be desirable in some corner cases. Like a saved guest
> > would refuse to resume if it was saved before the microcode update
> > that deprecated TSX.
>
> That corner case needs a lot more justification. Otherwise this is just
> silly.

Agree, chances of hitting the save/resume guest condition described
above is low. I am okay with dropping this patch.

Thanks,
Pawan