There are use cases which not all FVs need be migrated from TempRam to
permanent memory before TempRam tears down. This new guid is introduced
to avoid unnecessary FV migration to improve boot performance. Platform
can publish MigrationInfo hob with this guid to customize FV migration
info, and PeiCore will only migrate FVs indicated by this Hob info.

This is a backwards compatible change, PeiCore will check MigrationInfo
hob before migration. If MigrationInfo hobs exists, only migrate FVs
recorded by hobs. If MigrationInfo hobs not exists, migrate all FVs to
permanent memory.

In Tcg driver, when MigratedFvInfo hob is detected, existing code logic
is assuming FV raw data is already copied, and raw data base address is
also recorded. Due to the new PeiCore change, the platform can publish
hob to indicate raw data need be copied or not along with FV migration.

Two cases need be considered to skip copy for boot performance: The first
case is FV is not expected to be measured in post-mem phase, we should
use MeasurementExcludedPpiGuid to skip measurement. The second case is
FV raw data has no need to do rebase operation after migration, then
measurement should calculate hash directly from FV base address.

Fan Wang (2):
  MdeModulePkg: Support customized FV Migration Information
  SecurityPkg: Support customized FV Migration Information

 MdeModulePkg/Core/Pei/Dispatcher/Dispatcher.c | 84 ++++++++++++++-----
 MdeModulePkg/Core/Pei/Memory/MemoryServices.c | 40 ---------
 MdeModulePkg/Core/Pei/PeiMain.h               | 11 ---
 MdeModulePkg/Core/Pei/PeiMain.inf             |  1 +
 MdeModulePkg/Include/Guid/MigratedFvInfo.h    | 42 +++++++++-
 MdeModulePkg/MdeModulePkg.dec                 |  3 +-
 SecurityPkg/Tcg/Tcg2Pei/Tcg2Pei.c             |  7 +-
 SecurityPkg/Tcg/TcgPei/TcgPei.c               |  7 +-
 8 files changed, 116 insertions(+), 79 deletions(-)

-- 
2.29.2.windows.2



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