Add SmmCpuPlatformHookLib IsCpuSyncAlwaysNeeded interface

This patch adds the IsCpuSyncAlwaysNeeded interface to the SmmCpuPlatformHookLib.
This interface will determine whether the first CPU Synchronization should be
executed unconditionally when a SMI occurs.

If the function returns true, it indicates that there is no need to check the
system configuration and status, and the first CPU Synchronization should be
executed unconditionally.

If the function returns false, it indicates that the first CPU Synchronization is
not executed unconditionally, and the decision to synchronize should be based on
the system configuration and status.

Signed-off-by: Khor Swee Aun <[email protected]>

Author: sweeaun

UefiCpuPkg/Include/Library/SmmCpuPlatformHookLib.h

@@ -115,4 +115,24 @@ SmmCpuPlatformHookBeforeMmiHandler (
   VOID
   );
 
+/**
+  This function determines whether the first CPU Synchronization should be executed unconditionally
+  when a SMI occurs.
+
+  If the function returns true, it indicates that there is no need to check the system configuration
+  and status, and the first CPU Synchronization should be executed unconditionally.
+
+  If the function returns false, it indicates that the first CPU Synchronization is not executed
+  unconditionally, and the decision to synchronize should be based on the system configuration and status.
+
+  @retval TRUE   The first CPU Synchronization is executed unconditionally.
+  @retval FALSE  The first CPU Synchronization is not executed unconditionally.
+
+**/
+BOOLEAN
+EFIAPI
+IsCpuSyncAlwaysNeeded (
+  VOID
+  );
+
 #endif

UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.c

@@ -118,3 +118,26 @@ SmmCpuPlatformHookBeforeMmiHandler (
 {
   return EFI_UNSUPPORTED;
 }
+
+/**
+  This function determines whether the first CPU Synchronization should be executed unconditionally
+  when a SMI occurs.
+
+  If the function returns true, it indicates that there is no need to check the system configuration
+  and status, and the first CPU Synchronization should be executed unconditionally.
+
+  If the function returns false, it indicates that the first CPU Synchronization is not executed
+  unconditionally, and the decision to synchronize should be based on the system configuration and status.
+
+  @retval TRUE   The first CPU Synchronization is executed unconditionally.
+  @retval FALSE  The first CPU Synchronization is not executed unconditionally.
+
+**/
+BOOLEAN
+EFIAPI
+IsCpuSyncAlwaysNeeded (
+  VOID
+  )
+{
+  return FALSE;
+}