diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c index 5c562d4759..85ca4a2946 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c @@ -217,9 +217,9 @@ RestoreVolatileRegisters ( CPUID_VERSION_INFO_EDX VersionInfoEdx; IA32_TSS_DESCRIPTOR *Tss; - AsmWriteCr0 (VolatileRegisters->Cr0); AsmWriteCr3 (VolatileRegisters->Cr3); AsmWriteCr4 (VolatileRegisters->Cr4); + AsmWriteCr0 (VolatileRegisters->Cr0); if (IsRestoreDr) { AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, &VersionInfoEdx.Uint32); @@ -1558,7 +1558,7 @@ MpInitLibInitialize ( ApLoopMode = GetApLoopMode (&MonitorFilterSize); // - // Save BSP's Control registers for APs + // Save BSP's Control registers for APs. // SaveVolatileRegisters (&VolatileRegisters); @@ -1656,6 +1656,10 @@ MpInitLibInitialize ( // CopyMem ((VOID *)ApIdtBase, (VOID *)VolatileRegisters.Idtr.Base, VolatileRegisters.Idtr.Limit + 1); VolatileRegisters.Idtr.Base = ApIdtBase; + // + // Don't pass BSP's TR to APs to avoid AP init failure. + // + VolatileRegisters.Tr = 0; CopyMem (&CpuMpData->CpuData[0].VolatileRegisters, &VolatileRegisters, sizeof (VolatileRegisters)); // // Set BSP basic information