The SDM requires only one thread per core to load the microcode. This change enables this solution.
Cc: Laszlo Ersek <[email protected]> Cc: Ruiyu Ni <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Eric Dong <[email protected]> --- UefiCpuPkg/Library/MpInitLib/Microcode.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/UefiCpuPkg/Library/MpInitLib/Microcode.c b/UefiCpuPkg/Library/MpInitLib/Microcode.c index 351975e2a2..122c23469d 100644 --- a/UefiCpuPkg/Library/MpInitLib/Microcode.c +++ b/UefiCpuPkg/Library/MpInitLib/Microcode.c @@ -61,6 +61,7 @@ MicrocodeDetect ( VOID *MicrocodeData; MSR_IA32_PLATFORM_ID_REGISTER PlatformIdMsr; UINT32 ProcessorFlags; + UINT32 ThreadId; if (CpuMpData->MicrocodePatchRegionSize == 0) { // @@ -77,6 +78,14 @@ MicrocodeDetect ( return; } + GetProcessorLocationByApicId (GetInitialApicId (), NULL, NULL, &ThreadId); + if (ThreadId != 0) { + // + // Skip loading microcode if it is not the first thread in one core. + // + return; + } + ExtendedTableLength = 0; // // Here data of CPUID leafs have not been collected into context buffer, so -- 2.15.0.windows.1 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
