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    Subject[PATCH v8 01/18] KVM: SVM: Add KVM_SEV SEND_START command
    Date
    From: Brijesh Singh <Brijesh.Singh@amd.com>

    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
    Reviewed-by: Steve Rutherford <srutherford@google.com>
    Reviewed-by: Venu Busireddy <venu.busireddy@oracle.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 | 27 ++++
    arch/x86/kvm/svm/sev.c | 125 ++++++++++++++++++
    include/linux/psp-sev.h | 8 +-
    include/uapi/linux/kvm.h | 12 ++
    4 files changed, 168 insertions(+), 4 deletions(-)

    diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst
    index c3129b9ba5cb..59cb59bd4675 100644
    --- a/Documentation/virt/kvm/amd-memory-encryption.rst
    +++ b/Documentation/virt/kvm/amd-memory-encryption.rst
    @@ -263,6 +263,33 @@ 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_certs_uaddr; /* platform certificate chain */
    + __u32 plat_certs_len;
    +
    + __u64 amd_certs_uaddr; /* AMD certificate */
    + __u32 amd_certs_len;
    +
    + __u64 session_uaddr; /* Guest session information */
    + __u32 session_len;
    + };
    +
    References
    ==========

    diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
    index cf912b4aaba8..5a15b43b4349 100644
    --- a/arch/x86/kvm/svm/sev.c
    +++ b/arch/x86/kvm/svm/sev.c
    @@ -913,6 +913,128 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
    return ret;
    }

    +/* Userspace wants to query session length. */
    +static int
    +__sev_send_start_query_session_length(struct kvm *kvm, struct kvm_sev_cmd *argp,
    + struct kvm_sev_send_start *params)
    +{
    + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
    + struct sev_data_send_start *data;
    + int ret;
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
    + if (data == NULL)
    + return -ENOMEM;
    +
    + data->handle = sev->handle;
    + ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, data, &argp->error);
    +
    + 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;
    +
    + kfree(data);
    + 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;
    + struct sev_data_send_start *data;
    + struct kvm_sev_send_start params;
    + void *amd_certs, *session_data;
    + void *pdh_cert, *plat_certs;
    + 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;
    +
    + /* if session_len is zero, userspace wants to query the session length */
    + if (!params.session_len)
    + return __sev_send_start_query_session_length(kvm, argp,
    + &params);
    +
    + /* some sanity checks */
    + if (!params.pdh_cert_uaddr || !params.pdh_cert_len ||
    + !params.session_uaddr || params.session_len > SEV_FW_BLOB_MAX_SIZE)
    + return -EINVAL;
    +
    + /* allocate the memory to hold the session data blob */
    + session_data = kmalloc(params.session_len, GFP_KERNEL_ACCOUNT);
    + if (!session_data)
    + return -ENOMEM;
    +
    + /* 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_session;
    + }
    +
    + plat_certs = psp_copy_user_blob(params.plat_certs_uaddr,
    + params.plat_certs_len);
    + if (IS_ERR(plat_certs)) {
    + ret = PTR_ERR(plat_certs);
    + goto e_free_pdh;
    + }
    +
    + amd_certs = psp_copy_user_blob(params.amd_certs_uaddr,
    + params.amd_certs_len);
    + if (IS_ERR(amd_certs)) {
    + ret = PTR_ERR(amd_certs);
    + goto e_free_plat_cert;
    + }
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
    + if (data == NULL) {
    + ret = -ENOMEM;
    + goto e_free_amd_cert;
    + }
    +
    + /* populate the FW SEND_START field with system physical address */
    + data->pdh_cert_address = __psp_pa(pdh_cert);
    + data->pdh_cert_len = params.pdh_cert_len;
    + data->plat_certs_address = __psp_pa(plat_certs);
    + data->plat_certs_len = params.plat_certs_len;
    + data->amd_certs_address = __psp_pa(amd_certs);
    + data->amd_certs_len = params.amd_certs_len;
    + data->session_address = __psp_pa(session_data);
    + data->session_len = params.session_len;
    + data->handle = sev->handle;
    +
    + ret = sev_issue_cmd(kvm, SEV_CMD_SEND_START, data, &argp->error);
    +
    + if (!ret && copy_to_user((void __user *)(uintptr_t)params.session_uaddr,
    + session_data, params.session_len)) {
    + ret = -EFAULT;
    + goto e_free;
    + }
    +
    + params.policy = data->policy;
    + 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:
    + kfree(data);
    +e_free_amd_cert:
    + kfree(amd_certs);
    +e_free_plat_cert:
    + kfree(plat_certs);
    +e_free_pdh:
    + kfree(pdh_cert);
    +e_free_session:
    + kfree(session_data);
    + return ret;
    +}
    +
    int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    {
    struct kvm_sev_cmd sev_cmd;
    @@ -957,6 +1079,9 @@ 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/linux/psp-sev.h b/include/linux/psp-sev.h
    index 5167bf2bfc75..9f63b9d48b63 100644
    --- a/include/linux/psp-sev.h
    +++ b/include/linux/psp-sev.h
    @@ -323,11 +323,11 @@ struct sev_data_send_start {
    u64 pdh_cert_address; /* In */
    u32 pdh_cert_len; /* In */
    u32 reserved1;
    - u64 plat_cert_address; /* In */
    - u32 plat_cert_len; /* In */
    + u64 plat_certs_address; /* In */
    + u32 plat_certs_len; /* In */
    u32 reserved2;
    - u64 amd_cert_address; /* In */
    - u32 amd_cert_len; /* In */
    + u64 amd_certs_address; /* In */
    + u32 amd_certs_len; /* In */
    u32 reserved3;
    u64 session_address; /* In */
    u32 session_len; /* In/Out */
    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index 428c7dde6b4b..8827d43e2684 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -1598,6 +1598,18 @@ struct kvm_sev_dbg {
    __u32 len;
    };

    +struct kvm_sev_send_start {
    + __u32 policy;
    + __u64 pdh_cert_uaddr;
    + __u32 pdh_cert_len;
    + __u64 plat_certs_uaddr;
    + __u32 plat_certs_len;
    + __u64 amd_certs_uaddr;
    + __u32 amd_certs_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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