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    Subject[PATCH v19 076/130] KVM: TDX: Finalize VM initialization
    Date
    From: Isaku Yamahata <isaku.yamahata@intel.com>

    To protect the initial contents of the guest TD, the TDX module measures
    the guest TD during the build process as SHA-384 measurement. The
    measurement of the guest TD contents needs to be completed to make the
    guest TD ready to run.

    Add a new subcommand, KVM_TDX_FINALIZE_VM, for VM-scoped
    KVM_MEMORY_ENCRYPT_OP to finalize the measurement and mark the TDX VM ready
    to run.

    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>

    ---
    v18:
    - Remove the change of tools/arch/x86/include/uapi/asm/kvm.h.

    v14 -> v15:
    - removed unconditional tdx_track() by tdx_flush_tlb_current() that
    does tdx_track().

    Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
    ---
    arch/x86/include/uapi/asm/kvm.h | 1 +
    arch/x86/kvm/vmx/tdx.c | 21 +++++++++++++++++++++
    2 files changed, 22 insertions(+)

    diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
    index 34167404020c..c160f60189d1 100644
    --- a/arch/x86/include/uapi/asm/kvm.h
    +++ b/arch/x86/include/uapi/asm/kvm.h
    @@ -573,6 +573,7 @@ enum kvm_tdx_cmd_id {
    KVM_TDX_INIT_VM,
    KVM_TDX_INIT_VCPU,
    KVM_TDX_EXTEND_MEMORY,
    + KVM_TDX_FINALIZE_VM,

    KVM_TDX_CMD_NR_MAX,
    };
    diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
    index 3cfba63a7762..6aff3f7e2488 100644
    --- a/arch/x86/kvm/vmx/tdx.c
    +++ b/arch/x86/kvm/vmx/tdx.c
    @@ -1400,6 +1400,24 @@ static int tdx_extend_memory(struct kvm *kvm, struct kvm_tdx_cmd *cmd)
    return ret;
    }

    +static int tdx_td_finalizemr(struct kvm *kvm)
    +{
    + struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
    + u64 err;
    +
    + if (!is_hkid_assigned(kvm_tdx) || is_td_finalized(kvm_tdx))
    + return -EINVAL;
    +
    + err = tdh_mr_finalize(kvm_tdx->tdr_pa);
    + if (WARN_ON_ONCE(err)) {
    + pr_tdx_error(TDH_MR_FINALIZE, err, NULL);
    + return -EIO;
    + }
    +
    + kvm_tdx->finalized = true;
    + return 0;
    +}
    +
    int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
    {
    struct kvm_tdx_cmd tdx_cmd;
    @@ -1422,6 +1440,9 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
    case KVM_TDX_EXTEND_MEMORY:
    r = tdx_extend_memory(kvm, &tdx_cmd);
    break;
    + case KVM_TDX_FINALIZE_VM:
    + r = tdx_td_finalizemr(kvm);
    + break;
    default:
    r = -EINVAL;
    goto out;
    --
    2.25.1

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