linux-kernel - Re: [PATCH] KVM: SEV: Disable KVM_CAP_VM_COPY_ENC_CONTEXT

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Date:   Thu, 16 Sep 2021 00:33:23 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        kvm list <kvm@...r.kernel.org>, Marc Orr <marcorr@...gle.com>,
        Nathan Tempelman <natet@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: SEV: Disable KVM_CAP_VM_COPY_ENC_CONTEXT_FROM for
 SEV-ES

On 15/09/21 18:10, Peter Gonda wrote:
> svm_vm_copy_asid_from() {
> 
>     asid = to_kvm_svm(source_kvm)->sev_info.asid;
> + handle = to_kvm_svm(source_kvm)->sev_info.handle;
> + fd = to_kvm_svm(source_kvm)->sev_info.fd;
> + es_active = to_kvm_svm(source_kvm)->sev_info.es_active;
> 
> ...
> 
>      /* Set enc_context_owner and copy its encryption context over */
>      mirror_sev = &to_kvm_svm(kvm)->sev_info;
>      mirror_sev->enc_context_owner = source_kvm;
>      mirror_sev->asid = asid;
>      mirror_sev->active = true;
> +  mirror_sev->handle = handle;
> +  mirror_sev->fd = fd;
> + mirror_sev->es_active = es_active;
> 
> Paolo would you prefer a patch to enable ES mirroring or continue with
> this patch to disable it for now?

If it's possible to enable it, it would be better.  The above would be a 
reasonable patch for 5.15-rc.

Paolo