Re: [PATCH 2/3] x86/cpu/amd: Add feature bit for MSR_AMD64_LS_CFG enumeration

[Pawan Gupta]

On Thu, Nov 10, 2022 at 12:00:11AM +0000, Andrew Cooper wrote:
> On 09/11/2022 17:37, Pawan Gupta wrote:
> > If SSBD is the only reason to restore MSR_AMD64_LS_CFG then we should be
> > able to use X86_FEATURE_LS_CFG_SSBD for enumeration.
>
> Yeah, although it occurs to me that you probably don't want to
> save/restore the whole MSR.  It's full of other things which want to
> stay in their current configuration.

Upstream currently saves and restores the whole MSR_AMD64_LS_CFG at
suspend/resume.

Is it that the configuration saved at suspend(other than SSBD) will not
be relevant at resume for this MSR? Is there any harm if keep the
current behavior?