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

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Date:   Tue, 21 Sep 2021 09:04:20 -0600
From:   Peter Gonda <pgonda@...gle.com>
To:     Nathan Tempelman <natet@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        kvm list <kvm@...r.kernel.org>, Marc Orr <marcorr@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Steve Rutherford <srutherford@...gle.com>
Subject: Re: [PATCH] KVM: SEV: Disable KVM_CAP_VM_COPY_ENC_CONTEXT_FROM for SEV-ES

On Thu, Sep 16, 2021 at 1:00 PM Nathan Tempelman <natet@...gle.com> wrote:
>
> On Thu, Sep 16, 2021 at 11:08 AM Nathan Tempelman <natet@...gle.com> wrote:
> >
> > On Wed, Sep 15, 2021 at 3:33 PM Paolo Bonzini <pbonzini@...hat.com> wrote:
> > >
> > > 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

Sounds good, sent a 2 patch series this morning.

> > >
> >
> > +1. We don't have any immediate plans for sev-es, but it would be nice
> > to have while we're here. But if you want to make the trivial fix I
> > can come along and do it later.
>
> +Steve Rutherford