On 3/4/22 20:49, isaku.yamahata@intel.com wrote:
> 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>
> ---
> arch/x86/include/uapi/asm/kvm.h | 1 +
> arch/x86/kvm/vmx/tdx.c | 21 +++++++++++++++++++++
> tools/arch/x86/include/uapi/asm/kvm.h | 1 +
> 3 files changed, 23 insertions(+)
>
> diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
> index 77f46260d868..943219a08fcd 100644
> --- a/arch/x86/include/uapi/asm/kvm.h
> +++ b/arch/x86/include/uapi/asm/kvm.h
> @@ -534,6 +534,7 @@ enum kvm_tdx_cmd_id {
> KVM_TDX_INIT_VM,
> KVM_TDX_INIT_VCPU,
> KVM_TDX_INIT_MEM_REGION,
> + 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 cd726c41d362..85d5f961d97e 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -1103,6 +1103,24 @@ static int tdx_init_mem_region(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_td_initialized(kvm) || 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;
> @@ -1123,6 +1141,9 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
> case KVM_TDX_INIT_MEM_REGION:
> r = tdx_init_mem_region(kvm, &tdx_cmd);
> break;
> + case KVM_TDX_FINALIZE_VM:
> + r = tdx_td_finalizemr(kvm);
> + break;
> default:
> r = -EINVAL;
> goto out;
> diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h
> index 77f46260d868..943219a08fcd 100644
> --- a/tools/arch/x86/include/uapi/asm/kvm.h
> +++ b/tools/arch/x86/include/uapi/asm/kvm.h
> @@ -534,6 +534,7 @@ enum kvm_tdx_cmd_id {
> KVM_TDX_INIT_VM,
> KVM_TDX_INIT_VCPU,
> KVM_TDX_INIT_MEM_REGION,
> + KVM_TDX_FINALIZE_VM,
>
> KVM_TDX_CMD_NR_MAX,
> };
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Note however that errors should be passed back in the struct.
Paolo