Thanks Siyuan and Eric, The patch has been pushed via commit a9e3458ba7.
Best Regards, Hao Wu > -----Original Message----- > From: Dong, Eric > Sent: Tuesday, February 04, 2020 9:47 PM > To: devel@edk2.groups.io; Wu, Hao A > Cc: Ni, Ray; Laszlo Ersek; Fu, Siyuan; Kinney, Michael D > Subject: RE: [edk2-devel] [PATCH v1] UefiCpuPkg/MpInitLib: Always get > CPUID & PlatformID in MicrocodeDetect() > > Reviewed-by: Eric Dong <eric.d...@intel.com> > > -----Original Message----- > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Wu, Hao > A > Sent: Monday, February 3, 2020 8:35 AM > To: devel@edk2.groups.io > Cc: Wu, Hao A <hao.a...@intel.com>; Dong, Eric <eric.d...@intel.com>; > Ni, Ray <ray...@intel.com>; Laszlo Ersek <ler...@redhat.com>; Fu, Siyuan > <siyuan...@intel.com>; Kinney, Michael D <michael.d.kin...@intel.com> > Subject: [edk2-devel] [PATCH v1] UefiCpuPkg/MpInitLib: Always get CPUID & > PlatformID in MicrocodeDetect() > > REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2498 > > Commit fd30b00707 updated the logic in function MicrocodeDetect() that > will directly use the CPUID and PlatformID information from the 'CpuData' > field in the CPU_MP_DATA structure, instead of collecting these information > for each processor via AsmCpuid() and AsmReadMsr64() calls respectively. > > At that moment, this approach worked fine for APs. Since: > a) When the APs are waken up for the 1st time (1st MpInitLibInitialize() > entry at PEI phase), the function InitializeApData() will be called for > each AP and the CPUID and PlatformID information will be collected. > > b) During the 2nd entry of MpInitLibInitialize() at DXE phase, when the > APs are waken up again, the function InitializeApData() will not be > called, which means the CPUID and PlatformID information will not be > collected. However, the below logics in MicrocodeDetect() function: > > CurrentRevision = GetCurrentMicrocodeSignature (); > IsBspCallIn = (ProcessorNumber == (UINTN)CpuMpData->BspNumber) ? > TRUE : FALSE; > if (CurrentRevision != 0 && !IsBspCallIn) { > // > // Skip loading microcode if it has been loaded successfully > // > return; > } > > will ensure that the microcode detection and application will be > skipped due to the fact that such process has already been done in the > PEI phase. > > But after commit 396e791059, which removes the above skip loading logic, > the CPUID and PlatformID information on APs will be used upon the 2nd > entry of the MpInitLibInitialize(). But since the CPUID and PlatformID > information has not been collected, it will bring issue to the microcode > detection process. > > This commit will update the logic in MicrocodeDetect() back to always > collecting the CPUID and PlatformID information explicitly. > > Cc: Eric Dong <eric.d...@intel.com> > Cc: Ray Ni <ray...@intel.com> > Cc: Laszlo Ersek <ler...@redhat.com> > Cc: Siyuan Fu <siyuan...@intel.com> > Cc: Michael D Kinney <michael.d.kin...@intel.com> > Signed-off-by: Hao A Wu <hao.a...@intel.com> > --- > UefiCpuPkg/Library/MpInitLib/Microcode.c | 15 +++++++++++++-- > 1 file changed, 13 insertions(+), 2 deletions(-) > > diff --git a/UefiCpuPkg/Library/MpInitLib/Microcode.c > b/UefiCpuPkg/Library/MpInitLib/Microcode.c > index b6675b9a60..67e214d463 100644 > --- a/UefiCpuPkg/Library/MpInitLib/Microcode.c > +++ b/UefiCpuPkg/Library/MpInitLib/Microcode.c > @@ -93,6 +93,7 @@ MicrocodeDetect ( > UINT32 InCompleteCheckSum32; > BOOLEAN CorrectMicrocode; > VOID *MicrocodeData; > + MSR_IA32_PLATFORM_ID_REGISTER PlatformIdMsr; > UINT32 ThreadId; > BOOLEAN IsBspCallIn; > > @@ -115,8 +116,18 @@ MicrocodeDetect ( > } > > ExtendedTableLength = 0; > - Eax.Uint32 = CpuMpData- > >CpuData[ProcessorNumber].ProcessorSignature; > - PlatformId = CpuMpData->CpuData[ProcessorNumber].PlatformId; > + // > + // Here data of CPUID leafs have not been collected into context > + buffer, so // GetProcessorCpuid() cannot be used here to retrieve CPUID > data. > + // > + AsmCpuid (CPUID_VERSION_INFO, &Eax.Uint32, NULL, NULL, NULL); > + > + // > + // The index of platform information resides in bits 50:52 of MSR > + IA32_PLATFORM_ID // > + PlatformIdMsr.Uint64 = AsmReadMsr64 (MSR_IA32_PLATFORM_ID); > + PlatformId = (UINT8) PlatformIdMsr.Bits.PlatformId; > + > > // > // Check whether AP has same processor with BSP. > -- > 2.12.0.windows.1 > > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#53836): https://edk2.groups.io/g/devel/message/53836 Mute This Topic: https://groups.io/mt/70934372/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-