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    SubjectRe: [PATCH Part2 v6 24/49] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command
    >
    > +19. KVM_SNP_LAUNCH_START
    > +------------------------
    > +
    > +The KVM_SNP_LAUNCH_START command is used for creating the memory encryption
    > +context for the SEV-SNP guest. To create the encryption context, user must
    > +provide a guest policy, migration agent (if any) and guest OS visible
    > +workarounds value as defined SEV-SNP specification.
    > +
    > +Parameters (in): struct kvm_snp_launch_start
    > +
    > +Returns: 0 on success, -negative on error
    > +
    > +::
    > +
    > + struct kvm_sev_snp_launch_start {
    > + __u64 policy; /* Guest policy to use. */
    > + __u64 ma_uaddr; /* userspace address of migration agent */
    > + __u8 ma_en; /* 1 if the migtation agent is enabled */

    migration

    > + __u8 imi_en; /* set IMI to 1. */
    > + __u8 gosvw[16]; /* guest OS visible workarounds */
    > + };
    > +
    > +See the SEV-SNP specification for further detail on the launch input.
    > +
    > References
    > ==========
    >

    >
    > +static int snp_decommission_context(struct kvm *kvm)
    > +{
    > + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
    > + struct sev_data_snp_decommission data = {};
    > + int ret;
    > +
    > + /* If context is not created then do nothing */
    > + if (!sev->snp_context)
    > + return 0;
    > +
    > + data.gctx_paddr = __sme_pa(sev->snp_context);
    > + ret = snp_guest_decommission(&data, NULL);

    Do we have a similar race like in sev_unbind_asid() with DEACTIVATE
    and WBINVD/DF_FLUSH? The SNP_DECOMMISSION spec looks quite similar to
    DEACTIVATE.

    > + if (WARN_ONCE(ret, "failed to release guest context"))
    > + return ret;
    > +
    > + /* free the context page now */
    > + snp_free_firmware_page(sev->snp_context);
    > + sev->snp_context = NULL;
    > +
    > + return 0;
    > +}
    > +
    > void sev_vm_destroy(struct kvm *kvm)
    > {
    > struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;

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