lkml.org 
[lkml]   [2017]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[Part2 PATCH v8 29/38] KVM: SVM: Add support for KVM_SEV_LAUNCH_MEASURE command
    Date
    The command is used to retrieve the measurement of contents encrypted
    through the KVM_SEV_LAUNCH_UPDATE_DATA 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
    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    Reviewed-by: Borislav Petkov <bp@suse.de>
    ---
    arch/x86/kvm/svm.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 74 insertions(+)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index 8f2a676b5553..3a5ae4fd7103 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -6002,6 +6002,77 @@ static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
    return ret;
    }

    +static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
    +{
    + struct kvm_sev_info *sev = &kvm->arch.sev_info;
    + struct sev_data_launch_measure *data;
    + struct kvm_sev_launch_measure params;
    + void *blob = NULL;
    + int ret;
    +
    + if (!sev_guest(kvm))
    + return -ENOTTY;
    +
    + if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
    + return -EFAULT;
    +
    + data = kzalloc(sizeof(*data), GFP_KERNEL);
    + if (!data)
    + return -ENOMEM;
    +
    + /* User wants to query the blob length */
    + if (!params.len)
    + goto cmd;
    +
    + if (params.uaddr) {
    + if (params.len > SEV_FW_BLOB_MAX_SIZE) {
    + ret = -EINVAL;
    + goto e_free;
    + }
    +
    + if (!access_ok(VERIFY_WRITE, params.uaddr, params.len)) {
    + ret = -EFAULT;
    + goto e_free;
    + }
    +
    + ret = -ENOMEM;
    + blob = kmalloc(params.len, GFP_KERNEL);
    + if (!blob)
    + goto e_free;
    +
    + data->address = __psp_pa(blob);
    + data->len = params.len;
    + }
    +
    +cmd:
    + data->handle = sev->handle;
    + ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error);
    +
    + /*
    + * If we query the session length, FW responded with expected data.
    + */
    + if (!params.len)
    + goto done;
    +
    + if (ret)
    + goto e_free_blob;
    +
    + if (blob) {
    + if (copy_to_user((void __user *)(uintptr_t)params.uaddr, blob, params.len))
    + ret = -EFAULT;
    + }
    +
    +done:
    + params.len = data->len;
    + if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params)))
    + ret = -EFAULT;
    +e_free_blob:
    + kfree(blob);
    +e_free:
    + kfree(data);
    + return ret;
    +}
    +
    static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    {
    struct kvm_sev_cmd sev_cmd;
    @@ -6025,6 +6096,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
    case KVM_SEV_LAUNCH_UPDATE_DATA:
    r = sev_launch_update_data(kvm, &sev_cmd);
    break;
    + case KVM_SEV_LAUNCH_MEASURE:
    + r = sev_launch_measure(kvm, &sev_cmd);
    + break;
    default:
    r = -EINVAL;
    goto out;
    --
    2.9.5
    \
     
     \ /
      Last update: 2017-11-06 19:14    [W:4.572 / U:0.212 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site