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    SubjectRe: [RFC PATCH v1 06/10] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command
    Date
    On 4/24/19 11:10 AM, Singh, Brijesh wrote:
    > The command finalize the guest receiving process and make the SEV guest
    > ready for the execution.
    >
    > Cc: Thomas Gleixner <tglx@linutronix.de>
    > Cc: Ingo Molnar <mingo@redhat.com>
    > Cc: "H. Peter Anvin" <hpa@zytor.com>
    > Cc: Paolo Bonzini <pbonzini@redhat.com>
    > Cc: "Radim Krčmář" <rkrcmar@redhat.com>
    > Cc: Joerg Roedel <joro@8bytes.org>
    > Cc: Borislav Petkov <bp@suse.de>
    > Cc: Tom Lendacky <thomas.lendacky@amd.com>
    > Cc: x86@kernel.org
    > Cc: kvm@vger.kernel.org
    > Cc: linux-kernel@vger.kernel.org
    > Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    > ---
    > .../virtual/kvm/amd-memory-encryption.rst | 8 +++++++
    > arch/x86/kvm/svm.c | 23 +++++++++++++++++++
    > 2 files changed, 31 insertions(+)
    >
    > diff --git a/Documentation/virtual/kvm/amd-memory-encryption.rst b/Documentation/virtual/kvm/amd-memory-encryption.rst
    > index b9c3dc02f344..72c45f93abd7 100644
    > --- a/Documentation/virtual/kvm/amd-memory-encryption.rst
    > +++ b/Documentation/virtual/kvm/amd-memory-encryption.rst
    > @@ -346,6 +346,14 @@ Returns: 0 on success, -negative on error
    > __u32 trans_len;
    > };
    >
    > +15. KVM_SEV_RECEIVE_FINISH
    > +------------------------
    > +
    > +After completion of the migration flow, the KVM_SEV_RECEIVE_FINISH command can be
    > +issued by the hypervisor to make the guest ready for the execution.

    for execution.

    Thanks,
    Tom

    > +
    > +Returns: 0 on success, -negative on error
    > +
    > References
    > ==========
    >
    > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    > index c81cac09c5af..74b57ab742ad 100644
    > --- a/arch/x86/kvm/svm.c
    > +++ b/arch/x86/kvm/svm.c
    > @@ -7350,6 +7350,26 @@ static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
    > return ret;
    > }
    >
    > +static int sev_receive_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
    > +{
    > + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
    > + struct sev_data_receive_finish *data;
    > + int ret;
    > +
    > + if (!sev_guest(kvm))
    > + return -ENOTTY;
    > +
    > + data = kzalloc(sizeof(*data), GFP_KERNEL);
    > + if (!data)
    > + return -ENOMEM;
    > +
    > + data->handle = sev->handle;
    > + ret = sev_issue_cmd(kvm, SEV_CMD_RECEIVE_FINISH, data, &argp->error);
    > +
    > + kfree(data);
    > + return ret;
    > +}
    > +
    > static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    > {
    > struct kvm_sev_cmd sev_cmd;
    > @@ -7406,6 +7426,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    > case KVM_SEV_RECEIVE_UPDATE_DATA:
    > r = sev_receive_update_data(kvm, &sev_cmd);
    > break;
    > + case KVM_SEV_RECEIVE_FINISH:
    > + r = sev_receive_finish(kvm, &sev_cmd);
    > + break;
    > default:
    > r = -EINVAL;
    > goto out;
    >
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