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

[Pawan Gupta]

On 06.07.2021 15:52, Eduardo Habkost 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.
>
> Why is a global option necessary to allow those guests to be
> resumed?  Why can't KVM_GET_SUPPORTED_CPUID always return the HLE
> and RTM bits as supported when the host CPU has them?

Yes, the global option is unnecessary and this patch was dropped in v2.

Thanks,
Pawan