Re: [PATCH 6.12 111/181] KVM: SVM: Add support to initialize SEV/SNP functionality in KVM

On Wed, Aug 19, 2026, Jinpu Wang wrote:
> Hi Harshit,
> 
> On Wed, Aug 19, 2026 at 9:12 AM Harshit Mogalapalli
> <[email protected]> wrote:

...

> > > diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> > > index 6cec696461da2..bd0344bacaf1e 100644
> > > --- a/arch/x86/kvm/svm/sev.c
> > > +++ b/arch/x86/kvm/svm/sev.c
> > > @@ -2972,6 +2972,7 @@ void __init sev_set_cpu_caps(void)
> > >   void __init sev_hardware_setup(void)
> > >   {
> > >       unsigned int eax, ebx, ecx, edx, sev_asid_count, sev_es_asid_count;
> > > +     struct sev_platform_init_args init_args = {0};
> > >       bool sev_snp_supported = false;
> > >       bool sev_es_supported = false;
> > >       bool sev_supported = false;
> > > @@ -3088,6 +3089,15 @@ void __init sev_hardware_setup(void)
> > >       sev_supported_vmsa_features = 0;
> > >       if (sev_es_debug_swap_enabled)
> > >               sev_supported_vmsa_features |= SVM_SEV_FEAT_DEBUG_SWAP;
> > > +
> > > +     if (!sev_enabled)
> > > +             return;
> > > +
> > > +     /*
> > > +      * Do both SNP and SEV initialization at KVM module load.
> > > +      */
> > > +     init_args.probe = true;
> > > +     sev_platform_init(&init_args);
> > >   }

...

> That looks like the case, we only use kvm as module, didn't hit the issue.
> > The relevant upstream commits are:
> >
> > 435b344a7042 ("crypto: ccp: Add external API interface for PSP module
> > initialization")
> > 44e70718df4f ("KVM: SVM: Ensure PSP module is initialized if KVM module
> > is built-in")
> > 409f45387c93 ("x86/sev: Fix broken SNP support with KVM module built-in")
> >
> >
> > https://lore.kernel.org/stable/[email protected]/
> >
> >
> > Could the KVM maintainers confirm whether 6.12.y needs this full series?

Yes, we should also backport the above fixes to 6.12.y.

> > Probably could be done after this cycle, but still noting it here.

Yes, sadly this patch is needed to make SNP usable for *any* configuration, due
to bb1c84647025 ("crypto: ccp - Move SEV/SNP Platform initialization to KVM")
already being in 6.12.