OvmfPkg/PlatformPei: remove mFeatureControlValue

[mirror_edk2.git] / OvmfPkg / PlatformPei / FeatureControl.c

/**@file\r
  Install a callback when necessary for setting the Feature Control MSR on all\r
  processors.\r
\r
  Copyright (C) 2016, Red Hat, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
#include <Library/DebugLib.h>\r
#include <Library/HobLib.h>\r
#include <Library/PeiServicesLib.h>\r
#include <Library/QemuFwCfgLib.h>\r
#include <Ppi/MpServices.h>\r
#include <Register/ArchitecturalMsr.h>\r
#include <IndustryStandard/Tdx.h>\r
\r
#include "Platform.h"\r
\r
/**\r
  Write the Feature Control MSR on an Application Processor or the Boot\r
  Processor.\r
\r
  All APs execute this function in parallel. The BSP executes the function\r
  separately.\r
\r
  @param[in,out] WorkSpace  Pointer to the input/output argument workspace\r
                            shared by all processors.\r
**/\r
STATIC\r
VOID\r
EFIAPI\r
WriteFeatureControl (\r
  IN OUT VOID  *WorkSpace\r
  )\r
{\r
  EFI_HOB_PLATFORM_INFO  *PlatformInfoHob = WorkSpace;\r
\r
  if (TdIsEnabled ()) {\r
    TdVmCall (\r
      TDVMCALL_WRMSR,\r
      (UINT64)MSR_IA32_FEATURE_CONTROL,\r
      PlatformInfoHob->FeatureControlValue,\r
      0,\r
      0,\r
      0\r
      );\r
  } else {\r
    AsmWriteMsr64 (\r
      MSR_IA32_FEATURE_CONTROL,\r
      PlatformInfoHob->FeatureControlValue\r
      );\r
  }\r
}\r
\r
/**\r
  Notification function called when EFI_PEI_MP_SERVICES_PPI becomes available.\r
\r
  @param[in] PeiServices      Indirect reference to the PEI Services Table.\r
  @param[in] NotifyDescriptor Address of the notification descriptor data\r
                              structure.\r
  @param[in] Ppi              Address of the PPI that was installed.\r
\r
  @return  Status of the notification. The status code returned from this\r
           function is ignored.\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
OnMpServicesAvailable (\r
  IN EFI_PEI_SERVICES           **PeiServices,\r
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,\r
  IN VOID                       *Ppi\r
  )\r
{\r
  EFI_PEI_MP_SERVICES_PPI  *MpServices;\r
  EFI_STATUS               Status;\r
  EFI_HOB_PLATFORM_INFO    *PlatformInfoHob;\r
  EFI_HOB_GUID_TYPE        *GuidHob;\r
\r
  GuidHob = GetFirstGuidHob (&gUefiOvmfPkgPlatformInfoGuid);\r
  if (GuidHob == NULL) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  PlatformInfoHob = (EFI_HOB_PLATFORM_INFO *)GET_GUID_HOB_DATA (GuidHob);\r
\r
  DEBUG ((DEBUG_VERBOSE, "%a: %a\n", gEfiCallerBaseName, __FUNCTION__));\r
\r
  //\r
  // Write the MSR on all the APs in parallel.\r
  //\r
  MpServices = Ppi;\r
  Status     = MpServices->StartupAllAPs (\r
                             (CONST EFI_PEI_SERVICES **)PeiServices,\r
                             MpServices,\r
                             WriteFeatureControl, // Procedure\r
                             FALSE,               // SingleThread\r
                             0,                   // TimeoutInMicroSeconds: inf.\r
                             PlatformInfoHob      // ProcedureArgument\r
                             );\r
  if (EFI_ERROR (Status) && (Status != EFI_NOT_STARTED)) {\r
    DEBUG ((DEBUG_ERROR, "%a: StartupAllAps(): %r\n", __FUNCTION__, Status));\r
    return Status;\r
  }\r
\r
  //\r
  // Now write the MSR on the BSP too.\r
  //\r
  WriteFeatureControl (PlatformInfoHob);\r
  return EFI_SUCCESS;\r
}\r
\r
//\r
// Notification object for registering the callback, for when\r
// EFI_PEI_MP_SERVICES_PPI becomes available.\r
//\r
STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR  mMpServicesNotify = {\r
  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags\r
  EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gEfiPeiMpServicesPpiGuid,               // Guid\r
  OnMpServicesAvailable                    // Notify\r
};\r
\r
VOID\r
InstallFeatureControlCallback (\r
  IN OUT EFI_HOB_PLATFORM_INFO  *PlatformInfoHob\r
  )\r
{\r
  EFI_STATUS            Status;\r
  FIRMWARE_CONFIG_ITEM  FwCfgItem;\r
  UINTN                 FwCfgSize;\r
\r
  Status = QemuFwCfgFindFile (\r
             "etc/msr_feature_control",\r
             &FwCfgItem,\r
             &FwCfgSize\r
             );\r
  if (EFI_ERROR (Status) || (FwCfgSize != sizeof (PlatformInfoHob->FeatureControlValue))) {\r
    //\r
    // Nothing to do.\r
    //\r
    return;\r
  }\r
\r
  QemuFwCfgSelectItem (FwCfgItem);\r
  QemuFwCfgReadBytes (\r
    sizeof (PlatformInfoHob->FeatureControlValue),\r
    &(PlatformInfoHob->FeatureControlValue)\r
    );\r
\r
  Status = PeiServicesNotifyPpi (&mMpServicesNotify);\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((\r
      DEBUG_ERROR,\r
      "%a: failed to set up MP Services callback: %r\n",\r
      __FUNCTION__,\r
      Status\r
      ));\r
  }\r
}\r