X86 specific BaseLib API AsmLfence() was introduced to address the Spectre Variant 1 (CVE-2017-5753) issue. The purpose of this API is to insert barriers to stop speculative execution. However, the API is highly architecture (X86) specific, and thus should be avoided using across generic code.
To address this issue, this series will add a new BaseLib API called SpeculationBarrier(). Different architectures will have different implementations for this API. And the series will replace the usage of AsmLfence() in generic codes with this newly added SpeculationBarrier(). For the implementations of API SpeculationBarrier() among different architectures, this series will: * For IA32 and x64, SpeculationBarrier() will directly call AsmLfence(). * For ARM and EBC architectures, an empty implementation is temporarily added as a placeholder. We hope experts in those domains can help to contribute the actual implementation. Cc: Ard Biesheuvel <[email protected]> Cc: Leif Lindholm <[email protected]> Cc: Liming Gao <[email protected]> Cc: Michael D Kinney <[email protected]> Cc: Jiewen Yao <[email protected]> Cc: Laszlo Ersek <[email protected]> Cc: Jian J Wang <[email protected]> Cc: Star Zeng <[email protected]> Cc: Eric Dong <[email protected]> Cc: Ruiyu Ni <[email protected]> Hao Wu (5): MdePkg/BaseLib: Introduce new SpeculationBarrier API MdeModulePkg/FaultTolerantWrite: Update to consume SpeculationBarrier MdeModulePkg/SmmLockBox: Update to consume SpeculationBarrier MdeModulePkg/Variable: Update to consume SpeculationBarrier UefiCpuPkg/PiSmmCpuDxeSmm: Update to consume SpeculationBarrier MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf | 2 +- MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf | 2 +- MdePkg/Library/BaseLib/BaseLib.inf | 5 +++ MdeModulePkg/Universal/Variable/RuntimeDxe/PrivilegePolymorphic.h | 10 +++--- MdePkg/Include/Library/BaseLib.h | 15 +++++++++ MdeModulePkg/Universal/FaultTolerantWriteDxe/FaultTolerantWriteSmm.c | 8 ++--- MdeModulePkg/Universal/LockBox/SmmLockBox/SmmLockBox.c | 12 ++++---- MdeModulePkg/Universal/Variable/RuntimeDxe/{LoadFenceDxe.c => SpeculationBarrierDxe.c} | 12 +++++--- MdeModulePkg/Universal/Variable/RuntimeDxe/{LoadFenceSmm.c => SpeculationBarrierSmm.c} | 14 +++++---- MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c | 6 ++-- MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c | 24 +++++++-------- MdePkg/Library/BaseLib/Arm/SpeculationBarrier.c | 30 ++++++++++++++++++ MdePkg/Library/BaseLib/Ebc/SpeculationBarrier.c | 30 ++++++++++++++++++ MdePkg/Library/BaseLib/X86SpeculationBarrier.c | 32 ++++++++++++++++++++ UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.c | 6 ++-- 15 files changed, 163 insertions(+), 45 deletions(-) rename MdeModulePkg/Universal/Variable/RuntimeDxe/{LoadFenceDxe.c => SpeculationBarrierDxe.c} (62%) rename MdeModulePkg/Universal/Variable/RuntimeDxe/{LoadFenceSmm.c => SpeculationBarrierSmm.c} (61%) create mode 100644 MdePkg/Library/BaseLib/Arm/SpeculationBarrier.c create mode 100644 MdePkg/Library/BaseLib/Ebc/SpeculationBarrier.c create mode 100644 MdePkg/Library/BaseLib/X86SpeculationBarrier.c -- 2.12.0.windows.1 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
