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    Subject[RFC PATCH v1 01/10] KVM: SVM: Add KVM_SEV SEND_START command
    Date
    The command is used to create an outgoing SEV guest encryption context.

    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 | 24 +++++
    arch/x86/kvm/svm.c | 101 ++++++++++++++++++
    include/uapi/linux/kvm.h | 12 +++
    3 files changed, 137 insertions(+)

    diff --git a/Documentation/virtual/kvm/amd-memory-encryption.rst b/Documentation/virtual/kvm/amd-memory-encryption.rst
    index 659bbc093b52..340ac4f87321 100644
    --- a/Documentation/virtual/kvm/amd-memory-encryption.rst
    +++ b/Documentation/virtual/kvm/amd-memory-encryption.rst
    @@ -238,6 +238,30 @@ Returns: 0 on success, -negative on error
    __u32 trans_len;
    };

    +10. KVM_SEV_SEND_START
    +----------------------
    +
    +The KVM_SEV_SEND_START command can be used by the hypervisor to create an
    +outgoing guest encryption context.
    +
    +Parameters (in): struct kvm_sev_send_start
    +
    +Returns: 0 on success, -negative on error
    +
    +::
    + struct kvm_sev_send_start {
    + __u32 policy; /* guest policy */
    +
    + __u64 pdh_cert_uaddr; /* platform Diffie-Hellman certificate */
    + __u32 pdh_cert_len;
    +
    + __u64 plat_cert_uaddr; /* platform certificate chain */
    + __u32 plat_cert_len;
    +
    + __u64 amd_cert_uaddr; /* AMD certificate */
    + __u32 amd_cert_len;
    + };
    +
    References
    ==========

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index 406b558abfef..4c2a225ba546 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -6955,6 +6955,104 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
    return ret;
    }

    +static int sev_send_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
    +{
    + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
    + void *amd_cert = NULL, *session_data = NULL;
    + void *pdh_cert = NULL, *plat_cert = NULL;
    + struct sev_data_send_start *data = NULL;
    + struct kvm_sev_send_start params;
    + int ret;
    +
    + if (!sev_guest(kvm))
    + return -ENOTTY;
    +
    + if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data,
    + sizeof(struct kvm_sev_send_start)))
    + return -EFAULT;
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL);
    + if (!data)
    + return -ENOMEM;
    +
    + /* userspace wants to query the session length */
    + if (!params.session_len)
    + goto cmd;
    +
    + if (!params.pdh_cert_uaddr || !params.pdh_cert_len ||
    + !params.session_uaddr)
    + return -EINVAL;
    +
    + /* copy the certificate blobs from userspace */
    + pdh_cert = psp_copy_user_blob(params.pdh_cert_uaddr, params.pdh_cert_len);
    + if (IS_ERR(pdh_cert)) {
    + ret = PTR_ERR(pdh_cert);
    + goto e_free;
    + }
    +
    + data->pdh_cert_address = __psp_pa(pdh_cert);
    + data->pdh_cert_len = params.pdh_cert_len;
    +
    + plat_cert = psp_copy_user_blob(params.plat_cert_uaddr, params.plat_cert_len);
    + if (IS_ERR(plat_cert)) {
    + ret = PTR_ERR(plat_cert);
    + goto e_free_pdh;
    + }
    +
    + data->plat_cert_address = __psp_pa(plat_cert);
    + data->plat_cert_len = params.plat_cert_len;
    +
    + amd_cert = psp_copy_user_blob(params.amd_cert_uaddr, params.amd_cert_len);
    + if (IS_ERR(amd_cert)) {
    + ret = PTR_ERR(amd_cert);
    + goto e_free_plat_cert;
    + }
    +
    + data->amd_cert_address = __psp_pa(amd_cert);
    + data->amd_cert_len = params.amd_cert_len;
    +
    + ret = -ENOMEM;
    + session_data = kmalloc(params.session_len, GFP_KERNEL);
    + if (!session_data)
    + goto e_free_amd_cert;
    +
    + data->session_address = __psp_pa(session_data);
    + data->session_len = params.session_len;
    +cmd:
    + data->handle = sev->handle;
    + ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, data, &argp->error);
    +
    + /* if we queried the session length, FW responded with expected data */
    + if (!params.session_len)
    + goto done;
    +
    + if (copy_to_user((void __user *)(uintptr_t) params.session_uaddr,
    + session_data, params.session_len)) {
    + ret = -EFAULT;
    + goto e_free_session;
    + }
    +
    + params.policy = data->policy;
    +
    +done:
    + params.session_len = data->session_len;
    + if (copy_to_user((void __user *)(uintptr_t)argp->data, &params,
    + sizeof(struct kvm_sev_send_start)))
    + ret = -EFAULT;
    +
    +e_free_session:
    + kfree(session_data);
    +e_free_amd_cert:
    + kfree(amd_cert);
    +e_free_plat_cert:
    + kfree(plat_cert);
    +e_free_pdh:
    + kfree(pdh_cert);
    +e_free:
    + kfree(data);
    + return ret;
    +}
    +
    static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    {
    struct kvm_sev_cmd sev_cmd;
    @@ -6996,6 +7094,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    case KVM_SEV_LAUNCH_SECRET:
    r = sev_launch_secret(kvm, &sev_cmd);
    break;
    + case KVM_SEV_SEND_START:
    + r = sev_send_start(kvm, &sev_cmd);
    + break;
    default:
    r = -EINVAL;
    goto out;
    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index 6d4ea4b6c922..f425418bec13 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -1520,6 +1520,18 @@ struct kvm_sev_dbg {
    __u32 len;
    };

    +struct kvm_sev_send_start {
    + __u32 policy;
    + __u64 pdh_cert_uaddr;
    + __u32 pdh_cert_len;
    + __u64 plat_cert_uaddr;
    + __u32 plat_cert_len;
    + __u64 amd_cert_uaddr;
    + __u32 amd_cert_len;
    + __u64 session_uaddr;
    + __u32 session_len;
    +};
    +
    #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
    #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
    #define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)
    --
    2.17.1
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