Re: [PATCH] KVM: x86: Expose Predictive Store Forwarding Disable

[Jim Mattson]

On Wed, Aug 24, 2022 at 10:13 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>
> On 8/23/22 23:26, Jim Mattson wrote:
> > For consistency, should this feature be renamed AMD_PSFD, now that
> > Intel is enumerating PSFD with CPUID.(EAX=7,ECX=2):EDX.PSFD[bit 0]?
> > Seehttps://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/cpuid-enumeration-and-architectural-msrs.html.
> >
> > And, Paolo, why are we carrying X86_FEATURE_PSFD as a private #define
> > in KVM rather than putting it where it belongs in cpufeatures.h?
> >
>
> Borislav asked to not show psfd in /proc/cpuinfo, because Linux had
> decided not to control PSF separately; instead it just piggybacked
> on SSBD which should disable PSF as well.  Honestly I disagree but
> it's not my area of maintenance.

Do we expose PSFD in KVM for the use of another popular guest OS?