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

From: Pawan Gupta
Date: Fri Jun 11 2021 - 17:37:24 EST

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

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