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    Subject[PATCH v8 03/18] KVM: SVM: Add KVM_SEV_SEND_FINISH command
    Date
    From: Brijesh Singh <Brijesh.Singh@amd.com>

    The command is used to finailize the encryption context created with
    KVM_SEV_SEND_START command.

    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
    Reviewed-by: Steve Rutherford <srutherford@google.com>
    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
    ---
    .../virt/kvm/amd-memory-encryption.rst | 8 +++++++
    arch/x86/kvm/svm/sev.c | 23 +++++++++++++++++++
    2 files changed, 31 insertions(+)

    diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst
    index d0dfa5b54e4f..93884ec8918e 100644
    --- a/Documentation/virt/kvm/amd-memory-encryption.rst
    +++ b/Documentation/virt/kvm/amd-memory-encryption.rst
    @@ -314,6 +314,14 @@ Returns: 0 on success, -negative on error
    __u32 trans_len;
    };

    +12. KVM_SEV_SEND_FINISH
    +------------------------
    +
    +After completion of the migration flow, the KVM_SEV_SEND_FINISH command can be
    +issued by the hypervisor to delete the encryption context.
    +
    +Returns: 0 on success, -negative on error
    +
    References
    ==========

    diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
    index 7031b660f64d..4d3031c9fdcf 100644
    --- a/arch/x86/kvm/svm/sev.c
    +++ b/arch/x86/kvm/svm/sev.c
    @@ -1153,6 +1153,26 @@ static int sev_send_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
    return ret;
    }

    +static int sev_send_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
    +{
    + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
    + struct sev_data_send_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_SEND_FINISH, data, &argp->error);
    +
    + kfree(data);
    + return ret;
    +}
    +
    int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    {
    struct kvm_sev_cmd sev_cmd;
    @@ -1203,6 +1223,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    case KVM_SEV_SEND_UPDATE_DATA:
    r = sev_send_update_data(kvm, &sev_cmd);
    break;
    + case KVM_SEV_SEND_FINISH:
    + r = sev_send_finish(kvm, &sev_cmd);
    + break;
    default:
    r = -EINVAL;
    goto out;
    --
    2.17.1
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