The purpose is to fix an issue where an exception occurs at the start
of the DXE phase by applying the following patch series on INTEL-based
systems.
UefiCpuPkg: Refactor the logic for placing APs in HltLoop.
UefiCpuPkg: Refactor the logic for placing APs in Mwait/Runloop.
UefiCpuPkg: Create MpHandOff.
UefiCpuPkg: ApWakeupFunction directly use CpuMpData.
UefiCpuPkg: Eliminate the second INIT-SIPI-SIPI sequence.
This series of patches makes changes to the way the APs are
initialized and woken up. It removes the 2nd time INIT-SIPI-SIPI and
introduces a special startup signal to wake up APs. These patches also
create a new HOB identified by the mMpHandOffGuid, which stores only the
minimum information required from the PEI phase to the DXE phase.
As a result, the original HOB (mCpuInitMpLibHobGuid) is now used only
as a global variable in the PEI phase and is no longer necessary in the
DXE phase for INTEL-based systems. The AMD SEV-ES related code
still relies on the OldCpuMpData in the DXE phase.
This patch decouple the SEV-ES functionality of assigning CpuMpData to
OldCpuMpData->NewCpuMpData from the Intel logic.
Cc: Eric Dong <eric.d...@intel.com>
Cc: Rahul Kumar <rahul1.ku...@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Ray Ni <ray...@intel.com>
Signed-off-by: Yuanhao Xie <yuanhao....@intel.com>
---
UefiCpuPkg/Library/MpInitLib/MpLib.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c
b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index 737e03ffc5..4bb9f06edc 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -2160,7 +2160,9 @@ MpInitLibInitialize (
// APs have been wakeup before, just get the CPU Information
// from HOB
//
- AmdSevUpdateCpuMpData (CpuMpData);
+ if(CpuMpData->SevEsIsEnabled){
+ AmdSevUpdateCpuMpData (CpuMpData);
+ }
CpuMpData->CpuCount = MpHandOff->CpuCount;
CpuMpData->BspNumber = GetBspNumber (MpHandOff);
CpuInfoInHob = (CPU_INFO_IN_HOB *)(UINTN)CpuMpData->CpuInfoInHob;
--
2.36.1.windows.1
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