Hi Zhihao,
gEfiSmmCpuServiceProtocolGuid is defined in the UefiCpuPkg and is already an
EDK II specific feature protocol. Adding an Edkii names version of the
protocol does not make it clear that there is a relationship between the
two versions of this protocol. You have added one new service to the
existing protocol. The existing protocol does not have a Revision field
so we do have to create a new Protocol Name/Protocol GUID. Based on
previous use cases, we have a few options:
1) If Revision field is present, add to end and increase Revision value
2) If Revision field not present
a) Define an _2 or _Ex version of the protocol with new service(s) added
to end of structure and implement original version of the protocol on
top of the _2 version of the protocol.
b) Define a new Protocol with just the new services. (e.g.
gEdkiiSmmCpuRedezvousProtocolGuid)
The patch also changes the DEC default value of
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmSyncMode
from 0x00 to 0x01. Changing the default value of a PCD in a DEC file is a non
backwards compatible change. This should not be done. Instead, platforms that
need
the different sync mode should set that PCD in their DSC file.
Is a new lib class really required at this time. The reason to add a new lib
class is if there are multiple consumers.
I see the lib instance uses a RegisterProtocolNotify in its constructor. Is it
possible to use a Depex instead and eliminate the additional complexity of a
constructor and RegisterProtocolNotify?
Best regards,
Mike
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Li, Zhihao
> Sent: Monday, February 7, 2022 9:36 PM
> To: devel@edk2.groups.io
> Cc: Dong, Eric <eric.d...@intel.com>; Ni, Ray <ray...@intel.com>; Kumar,
> Rahul1 <rahul1.ku...@intel.com>
> Subject: [edk2-devel] [PATCH v1 1/2] UefiCpuPkg: Extend SMM CPU Service with
> rendezvous support.
>
> From: Zhihao Li <zhihao...@intel.com>
>
> REF： https://bugzilla.tianocore.org/show_bug.cgi?id=3815
>
> This patch extends the SMM CPU Service protocol with new interface
> SmmWaitForAllProcessor(), which can be used by SMI handler to optionally
> wait for other APs to complete SMM rendezvous in relaxed AP mode.
>
> A new library SmmCpuRendezvousLib is provided to abstract the service
> into library API to simple SMI handler code.
>
> Cc: Eric Dong <eric.d...@intel.com>
> Cc: Ray Ni <ray...@intel.com>
> Cc: Rahul Kumar <rahul1.ku...@intel.com>
>
> Signed-off-by: Zhihao Li <zhihao...@intel.com>
> ---
> UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.c | 109
> ++++++++++++++++++++
> UefiCpuPkg/PiSmmCpuDxeSmm/CpuService.c | 65
> ++++++++++++
> UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 14 ++-
> UefiCpuPkg/PiSmmCpuDxeSmm/SyncTimer.c | 2 +-
> UefiCpuPkg/Include/Library/SmmCpuRendezvousLib.h | 27 +++++
> UefiCpuPkg/Include/Protocol/SmmCpuService.h | 40 +++++++
> UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf | 32 ++++++
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 28 +++++
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf | 3 +-
> UefiCpuPkg/UefiCpuPkg.dec | 5 +-
> 10 files changed, 318 insertions(+), 7 deletions(-)
>
> diff --git a/UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.c
> b/UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.c
> new file mode 100644
> index 0000000000..3c5cd51d0c
> --- /dev/null
> +++ b/UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.c
> @@ -0,0 +1,109 @@
> +/** @file
>
> +SMM CPU Rendezvous library header file.
>
> +
>
> +Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
>
> +
>
> +**/
>
> +
>
> +
>
> +#include <Base.h>
>
> +#include <Uefi.h>
>
> +#include <Library/BaseLib.h>
>
> +#include <Library/DebugLib.h>
>
> +#include <Library/PcdLib.h>
>
> +#include <Library/SmmServicesTableLib.h>
>
> +#include <Protocol/SmmCpuService.h>
>
> +#include <Library/SmmCpuRendezvousLib.h>
>
> +
>
> +STATIC EDKII_SMM_CPU_SERVICE_PROTOCOL *mSmmCpuService = NULL;
>
> +
>
> +/**
>
> + This routine wait for all AP processors to arrive in SMM.
>
> +
>
> + @param BlockingMode Blocking mode or non-blocking mode.
>
> +
>
> + @retval TRUE All processors checked in to SMM
>
> + @retval FALSE Some processor not checked in to SMM
>
> +
>
> +**/
>
> +EFI_STATUS
>
> +EFIAPI
>
> +SmmWaitForAllProcessor (
>
> + IN BOOLEAN BlockingMode
>
> + )
>
> +{
>
> + EFI_STATUS Status;
>
> +
>
> + if (mSmmCpuService == NULL) {
>
> + return TRUE;
>
> + }
>
> +
>
> + Status = mSmmCpuService->WaitForAllProcessor (
>
> + mSmmCpuService,
>
> + BlockingMode
>
> + );
>
> + return EFI_ERROR(Status) ? FALSE : TRUE;
>
> +}
>
> +
>
> +/**
>
> + Register status code callback function only when Report Status Code
> protocol
>
> + is installed.
>
> +
>
> + @param Protocol Points to the protocol's unique identifier.
>
> + @param Interface Points to the interface instance.
>
> + @param Handle The handle on which the interface was installed.
>
> +
>
> + @retval EFI_SUCCESS Notification runs successfully.
>
> +
>
> +**/
>
> +EFI_STATUS
>
> +EFIAPI
>
> +SmmCpuServiceProtocolNotify (
>
> + IN CONST EFI_GUID *Protocol,
>
> + IN VOID *Interface,
>
> + IN EFI_HANDLE Handle
>
> + )
>
> +{
>
> + EFI_STATUS Status;
>
> +
>
> + Status = gSmst->SmmLocateProtocol (
>
> + &gEdkiiSmmCpuServiceProtocolGuid,
>
> + NULL,
>
> + (VOID **) &mSmmCpuService
>
> + );
>
> + ASSERT_EFI_ERROR (Status);
>
> +
>
> + return EFI_SUCCESS;
>
> +}
>
> +
>
> +/**
>
> + The constructor function
>
> +
>
> + @param[in] ImageHandle The firmware allocated handle for the EFI image.
>
> + @param[in] SystemTable A pointer to the EFI System Table.
>
> +
>
> + @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
>
> +
>
> +**/
>
> +EFI_STATUS
>
> +EFIAPI
>
> +SmmCpuRendezvousLibConstructor (
>
> + IN EFI_HANDLE ImageHandle,
>
> + IN EFI_SYSTEM_TABLE *SystemTable
>
> + )
>
> +{
>
> + EFI_STATUS Status;
>
> + VOID *Registration;
>
> +
>
> + Status = gSmst->SmmLocateProtocol (&gEdkiiSmmCpuServiceProtocolGuid, NULL,
> (VOID **) &mSmmCpuService);
>
> + if (EFI_ERROR (Status)) {
>
> + Status = gSmst->SmmRegisterProtocolNotify (
>
> + &gEdkiiSmmCpuServiceProtocolGuid,
>
> + SmmCpuServiceProtocolNotify,
>
> + &Registration
>
> + );
>
> + ASSERT_EFI_ERROR (Status);
>
> + }
>
> + return EFI_SUCCESS;
>
> +}
> \ No newline at end of file
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuService.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuService.c
> index 5d624f8e9e..34019c24ff 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/CpuService.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/CpuService.c
> @@ -20,6 +20,19 @@ EFI_SMM_CPU_SERVICE_PROTOCOL mSmmCpuService = {
> SmmRegisterExceptionHandler
>
> };
>
>
>
> +//
>
> +// EDKII SMM CPU Service Protocol instance
>
> +//
>
> +EDKII_SMM_CPU_SERVICE_PROTOCOL mEdkiiSmmCpuService = {
>
> + SmmGetProcessorInfo,
>
> + SmmSwitchBsp,
>
> + SmmAddProcessor,
>
> + SmmRemoveProcessor,
>
> + SmmWhoAmI,
>
> + SmmRegisterExceptionHandler,
>
> + SmmWaitForAllProcessor
>
> +};
>
> +
>
> /**
>
> Gets processor information on the requested processor at the instant this
> call is made.
>
>
>
> @@ -365,5 +378,57 @@ InitializeSmmCpuServices (
> &mSmmCpuService
>
> );
>
> ASSERT_EFI_ERROR (Status);
>
> +
>
> + Status = gSmst->SmmInstallProtocolInterface (
>
> + &Handle,
>
> + &gEdkiiSmmCpuServiceProtocolGuid,
>
> + EFI_NATIVE_INTERFACE,
>
> + &mEdkiiSmmCpuService
>
> + );
>
> + ASSERT_EFI_ERROR (Status);
>
> + return Status;
>
> +}
>
> +
>
> +/**
>
> + Wait for all processors enterring SMM until all CPUs are already
> synchronized or not.
>
> +
>
> + @param This A pointer to the
> EDKII_SMM_CPU_SERVICE_PROTOCOL instance.
>
> + @param BlockingMode Blocking mode or non-blocking mode.
>
> +
>
> + @retval EFI_SUCCESS All avaiable APs arrived.
>
> + @retval EFI_TIMEOUT Wait for all APs until timeout.
>
> +**/
>
> +EFI_STATUS
>
> +EFIAPI
>
> +SmmWaitForAllProcessor (
>
> + IN EDKII_SMM_CPU_SERVICE_PROTOCOL *This,
>
> + IN BOOLEAN BlockingMode
>
> + )
>
> +{
>
> + EFI_STATUS Status;
>
> +
>
> + //
>
> + // Return success immediately if all CPUs are already synchronized.
>
> + //
>
> + if (mSmmMpSyncData->AllApArrivedWithException) {
>
> + Status = EFI_SUCCESS;
>
> + goto ON_EXIT;
>
> + }
>
> +
>
> + if (!BlockingMode) {
>
> + Status = EFI_TIMEOUT;
>
> + goto ON_EXIT;
>
> + }
>
> +
>
> + //
>
> + // There are some APs outside SMM, Wait for all avaiable APs to arrive.
>
> + //
>
> + SmmWaitForApArrival (BlockingMode);
>
> + Status = mSmmMpSyncData->AllApArrivedWithException ? EFI_SUCCESS :
> EFI_TIMEOUT;
>
> +
>
> +ON_EXIT:
>
> + if (!mSmmMpSyncData->AllApArrivedWithException){
>
> + DEBUG ((EFI_D_INFO, "EdkiiSmmWaitForAllApArrival: Timeout to wait all
> APs arrival\n"));
>
> + }
>
> return Status;
>
> }
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> index 882dee4fe2..9c7b16728a 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> @@ -261,7 +261,7 @@ IsLmceSignaled (
> **/
>
> VOID
>
> SmmWaitForApArrival (
>
> - VOID
>
> + IN BOOLEAN BlockingMode
>
> )
>
> {
>
> UINT64 Timer;
>
> @@ -270,7 +270,14 @@ SmmWaitForApArrival (
> BOOLEAN LmceSignal;
>
>
>
> ASSERT (*mSmmMpSyncData->Counter <= mNumberOfCpus);
>
> -
>
> +
>
> + //
>
> + // if block is False, do not wait and return immediately.
>
> + //
>
> + if (!BlockingMode){
>
> + return;
>
> + }
>
> +
>
> LmceEn = FALSE;
>
> LmceSignal = FALSE;
>
> if (mMachineCheckSupported) {
>
> @@ -511,7 +518,7 @@ BSPHandler (
> //
>
> // Wait for APs to arrive
>
> //
>
> - SmmWaitForApArrival ();
>
> + SmmWaitForApArrival(TRUE);
>
>
>
> //
>
> // Lock the counter down and retrieve the number of APs
>
> @@ -1886,6 +1893,7 @@ InitializeMpSyncData (
> *mSmmMpSyncData->Counter = 0;
>
> *mSmmMpSyncData->InsideSmm = FALSE;
>
> *mSmmMpSyncData->AllCpusInSync = FALSE;
>
> + mSmmMpSyncData->AllApArrivedWithException = FALSE;
>
>
>
> for (CpuIndex = 0; CpuIndex <
> gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus; CpuIndex++) {
>
> mSmmMpSyncData->CpuData[CpuIndex].Busy =
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/SyncTimer.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/SyncTimer.c
> index 0c070c5736..844263f889 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/SyncTimer.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/SyncTimer.c
> @@ -8,7 +8,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
>
>
> #include "PiSmmCpuDxeSmm.h"
>
>
>
> -UINT64 mTimeoutTicker = 0;
>
> +UINT64 mTimeoutTicker = 0;
>
> //
>
> // Number of counts in a roll-over cycle of the performance counter.
>
> //
>
> diff --git a/UefiCpuPkg/Include/Library/SmmCpuRendezvousLib.h
> b/UefiCpuPkg/Include/Library/SmmCpuRendezvousLib.h
> new file mode 100644
> index 0000000000..f245c3a1c9
> --- /dev/null
> +++ b/UefiCpuPkg/Include/Library/SmmCpuRendezvousLib.h
> @@ -0,0 +1,27 @@
> +/** @file
>
> +SMM CPU Rendezvous library header file.
>
> +
>
> +Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
>
> +
>
> +**/
>
> +
>
> +#ifndef _SMM_CPU_RENDEZVOUS_H_
>
> +#define _SMM_CPU_RENDEZVOUS_H_
>
> +
>
> +/**
>
> + This routine wait for all AP processors to arrive in SMM.
>
> +
>
> + @param BlockingMode Blocking mode or non-blocking mode.
>
> +
>
> + @retval TRUE All processors checked in to SMM
>
> + @retval FALSE Some processor not checked in to SMM
>
> +
>
> +**/
>
> +EFI_STATUS
>
> +EFIAPI
>
> +SmmWaitForAllProcessor (
>
> + IN BOOLEAN BlockingMode
>
> + );
>
> +
>
> +#endif
>
> diff --git a/UefiCpuPkg/Include/Protocol/SmmCpuService.h
> b/UefiCpuPkg/Include/Protocol/SmmCpuService.h
> index 952767afce..0ace5356a9 100644
> --- a/UefiCpuPkg/Include/Protocol/SmmCpuService.h
> +++ b/UefiCpuPkg/Include/Protocol/SmmCpuService.h
> @@ -200,4 +200,44 @@ struct _EFI_SMM_CPU_SERVICE_PROTOCOL {
>
>
> extern EFI_GUID gEfiSmmCpuServiceProtocolGuid;
>
>
>
> +//
>
> +// EDKII_SMM_CPU_SERVICE_PROTOCOL extends the EFI_SMM_CPU_SERVICE_PROTOCOL
>
> +// with rendezvous service support.
>
> +//
>
> +#define EDKII_SMM_CPU_SERVICE_PROTOCOL_GUID \
>
> + { \
>
> + 0xaa00d50b, 0x4911, 0x428f, {0xb9, 0x1a, 0xa5, 0x9d, 0xdb, 0x13, 0xe2,
> 0x4c} \
>
> + }
>
> +
>
> +typedef struct _EDKII_SMM_CPU_SERVICE_PROTOCOL
> EDKII_SMM_CPU_SERVICE_PROTOCOL;
>
> +
>
> +/**
>
> + Wait for all APs to arrive SMM mode in given timeout constraint.
>
> +
>
> + @param This A pointer to the SMM_CPU_SERVICE_PROTOCOL
> instance.
>
> + @param BlockingMode Block or non-block mode.
>
> +
>
> + @retval EFI_SUCCESS All APs have arrived SMM mode except SMI
> disabled APs.
>
> + @retval EFI_TIMEOUT There are APs not in SMM mode in given
> timeout constraint.
>
> +
>
> +**/
>
> +typedef
>
> +EFI_STATUS
>
> +(EFIAPI *EDKII_WAIT_FOR_ALL_PROCESSOR) (
>
> + IN EDKII_SMM_CPU_SERVICE_PROTOCOL *This,
>
> + IN BOOLEAN BlockingMode
>
> + );
>
> +
>
> +struct _EDKII_SMM_CPU_SERVICE_PROTOCOL {
>
> + EFI_SMM_GET_PROCESSOR_INFO GetProcessorInfo;
>
> + EFI_SMM_SWITCH_BSP SwitchBsp;
>
> + EFI_SMM_ADD_PROCESSOR AddProcessor;
>
> + EFI_SMM_REMOVE_PROCESSOR RemoveProcessor;
>
> + EFI_SMM_WHOAMI WhoAmI;
>
> + EFI_SMM_REGISTER_EXCEPTION_HANDLER RegisterExceptionHandler;
>
> + EDKII_WAIT_FOR_ALL_PROCESSOR WaitForAllProcessor;
>
> +};
>
> +
>
> +extern EFI_GUID gEdkiiSmmCpuServiceProtocolGuid;
>
> +
>
> #endif
>
> diff --git a/UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
> b/UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
> new file mode 100644
> index 0000000000..aff77c5a18
> --- /dev/null
> +++ b/UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
> @@ -0,0 +1,32 @@
> +## @file
>
> +# Component description file for CPU SMM Rendezvous check library
>
> +##
>
> +
>
> +[Defines]
>
> + INF_VERSION = 0x00010005
>
> + BASE_NAME = SmmCpuRendezvousLib
>
> + FILE_GUID = 1509Bb36-9Ba4-438B-B195-Ac5914Db14E2
>
> + MODULE_TYPE = DXE_SMM_DRIVER
>
> + VERSION_STRING = 1.0
>
> + LIBRARY_CLASS = SmmCpuRendezvousLib
>
> + CONSTRUCTOR = SmmCpuRendezvousLibConstructor
>
> +
>
> +[Sources]
>
> + SmmCpuRendezvousLib.c
>
> +
>
> +[Packages]
>
> + MdePkg/MdePkg.dec
>
> + UefiCpuPkg/UefiCpuPkg.dec
>
> +
>
> +[LibraryClasses]
>
> + BaseLib
>
> + DebugLib
>
> + PcdLib
>
> + SmmServicesTableLib
>
> +
>
> +[Pcd]
>
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmApSyncTimeout ##
> CONSUMES
>
> +
>
> +[Protocols]
>
> + gEdkiiSmmCpuServiceProtocolGuid
>
> +
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> index 26d07c5b5e..c6f31ace77 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> @@ -428,6 +428,7 @@ typedef struct {
> volatile SMM_CPU_SYNC_MODE EffectiveSyncMode;
>
> volatile BOOLEAN SwitchBsp;
>
> volatile BOOLEAN *CandidateBsp;
>
> + volatile BOOLEAN AllApArrivedWithException;
>
> EFI_AP_PROCEDURE StartupProcedure;
>
> VOID *StartupProcArgs;
>
> } SMM_DISPATCHER_MP_SYNC_DATA;
>
> @@ -1488,4 +1489,31 @@ IsRestrictedMemoryAccess (
> VOID
>
> );
>
>
>
> +/**
>
> + Choose blocking or non-blocking mode to Wait for all APs
>
> +
>
> + @param This A pointer to the SMM_CPU_SERVICE_PROTOCOL
> instance.
>
> + @param BlockingMode Blocking or non-blocking mode
>
> +
>
> + @retval EFI_SUCCESS All APs have arrived SMM mode except SMI
> disabled APs.
>
> + @retval EFI_TIMEOUT There are APs not in SMM mode in given
> timeout constraint.
>
> +
>
> +**/
>
> +EFI_STATUS
>
> +EFIAPI
>
> +SmmWaitForAllProcessor (
>
> + IN EDKII_SMM_CPU_SERVICE_PROTOCOL *This,
>
> + IN BOOLEAN BlockingMode
>
> + );
>
> +
>
> +/**
>
> + Choose blocking or non-blocking mode to wait for all APs. True for
> Blocking and false for not.
>
> + Insure when this function returns, no AP will execute normal mode code
> before entering SMM, except SMI disabled APs.
>
> +
>
> +**/
>
> +VOID
>
> +SmmWaitForApArrival (
>
> + IN BOOLEAN BlockingMode
>
> + );
>
> +
>
> #endif
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> index 0e88071c70..1af7280d18 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> @@ -107,7 +107,8 @@
> gEfiSmmReadyToLockProtocolGuid ## NOTIFY
>
> gEfiSmmCpuServiceProtocolGuid ## PRODUCES
>
> gEdkiiSmmMemoryAttributeProtocolGuid ## PRODUCES
>
> - gEfiMmMpProtocolGuid ## PRODUCES
>
> + gEfiMmMpProtocolGuid ## PRODUCES
>
> + gEdkiiSmmCpuServiceProtocolGuid ## PRODUCES
>
>
>
> [Guids]
>
> gEfiAcpiVariableGuid ## SOMETIMES_CONSUMES ## HOB # it
> is used for S3 boot.
>
> diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> index 7de66fde67..c170e7d75d 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dec
> +++ b/UefiCpuPkg/UefiCpuPkg.dec
> @@ -77,7 +77,8 @@
>
>
> [Protocols]
>
> ## Include/Protocol/SmmCpuService.h
>
> - gEfiSmmCpuServiceProtocolGuid = { 0x1d202cab, 0xc8ab, 0x4d5c, { 0x94,
> 0xf7, 0x3c, 0xfc, 0xc0, 0xd3, 0xd3, 0x35 }}
>
> + gEfiSmmCpuServiceProtocolGuid = { 0x1d202cab, 0xc8ab, 0x4d5c, { 0x94,
> 0xf7, 0x3c, 0xfc, 0xc0, 0xd3, 0xd3, 0x35 }}
>
> + gEdkiiSmmCpuServiceProtocolGuid = { 0xaa00d50b, 0x4911, 0x428f, { 0xb9,
> 0x1a, 0xa5, 0x9d, 0xdb, 0x13, 0xe2, 0x4c }}
>
>
>
> ## Include/Protocol/SmMonitorInit.h
>
> gEfiSmMonitorInitProtocolGuid = { 0x228f344d, 0xb3de, 0x43bb, { 0xa4,
> 0xd7, 0xea, 0x20, 0xb, 0x1b, 0x14, 0x82 }}
>
> @@ -304,7 +305,7 @@
> # 0x00 - Traditional CPU synchronization method.<BR>
>
> # 0x01 - Relaxed CPU synchronization method.<BR>
>
> # @Prompt SMM CPU Synchronization Method.
>
> - gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmSyncMode|0x00|UINT8|0x60000014
>
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmSyncMode|0x01|UINT8|0x60000014
>
>
>
> ## Specifies the On-demand clock modulation duty cycle when ACPI feature
> is enabled.
>
> # @Prompt The encoded values for target duty cycle modulation.
>
> --
> 2.26.2.windows.1
>
>
>
>
>
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