Re: [edk2-devel] [PATCH v3 5/6] UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SaveCpuMpData()

["Laszlo Ersek" <lersek@redhat.com>]

On 2/22/24 17:01, Gerd Hoffmann wrote:
> Add support for splitting Hand-Off data into multiple HOBs.
> This is required for VMs with thousands of CPUs.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  UefiCpuPkg/Library/MpInitLib/PeiMpLib.c | 44 +++++++++++++++----------
>  1 file changed, 27 insertions(+), 17 deletions(-)
> 
> diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> index f80e00edcff3..00d48c2ab531 100644
> --- a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
> @@ -126,35 +126,45 @@ SaveCpuMpData (
>    IN CPU_MP_DATA  *CpuMpData
>    )
>  {
> +  UINT32           MaxCpusPerHob, CpusInHob;
>    UINT64           Data64;
> -  UINTN            Index;
> +  UINT32           Index, HobBase;
>    CPU_INFO_IN_HOB  *CpuInfoInHob;
>    MP_HAND_OFF      *MpHandOff;
>    UINTN            MpHandOffSize;
>  
> +  MaxCpusPerHob = (0xFFF8 - sizeof (EFI_HOB_GUID_TYPE) - sizeof (MP_HAND_OFF)) / sizeof (PROCESSOR_HAND_OFF);
> +
>    //
>    // When APs are in a state that can be waken up by a store operation to a memory address,
>    // report the MP_HAND_OFF data for DXE to use.
>    //
> -  CpuInfoInHob  = (CPU_INFO_IN_HOB *)(UINTN)CpuMpData->CpuInfoInHob;
> -  MpHandOffSize = sizeof (MP_HAND_OFF) + sizeof (PROCESSOR_HAND_OFF) * CpuMpData->CpuCount;
> -  MpHandOff     = (MP_HAND_OFF *)BuildGuidHob (&mMpHandOffGuid, MpHandOffSize);
> -  ASSERT (MpHandOff != NULL);
> -  ZeroMem (MpHandOff, MpHandOffSize);
> -  MpHandOff->ProcessorIndex = 0;
> +  CpuInfoInHob = (CPU_INFO_IN_HOB *)(UINTN)CpuMpData->CpuInfoInHob;
>  
> -  MpHandOff->CpuCount = CpuMpData->CpuCount;
> -  if (CpuMpData->ApLoopMode != ApInHltLoop) {
> -    MpHandOff->StartupSignalValue    = MP_HAND_OFF_SIGNAL;
> -    MpHandOff->WaitLoopExecutionMode = sizeof (VOID *);
> -  }
> +  for (Index = 0; Index < CpuMpData->CpuCount; Index++) {
> +    if (Index % MaxCpusPerHob == 0) {
> +      HobBase   = Index;
> +      CpusInHob = MIN (CpuMpData->CpuCount - HobBase, MaxCpusPerHob);
>  
> -  for (Index = 0; Index < MpHandOff->CpuCount; Index++) {
> -    MpHandOff->Info[Index].ApicId = CpuInfoInHob[Index].ApicId;
> -    MpHandOff->Info[Index].Health = CpuInfoInHob[Index].Health;
> +      MpHandOffSize = sizeof (MP_HAND_OFF) + sizeof (PROCESSOR_HAND_OFF) * CpusInHob;
> +      MpHandOff     = (MP_HAND_OFF *)BuildGuidHob (&mMpHandOffGuid, MpHandOffSize);
> +      ASSERT (MpHandOff != NULL);
> +      ZeroMem (MpHandOff, MpHandOffSize);
> +
> +      MpHandOff->ProcessorIndex = HobBase;
> +      MpHandOff->CpuCount       = CpusInHob;
> +
> +      if (CpuMpData->ApLoopMode != ApInHltLoop) {
> +        MpHandOff->StartupSignalValue    = MP_HAND_OFF_SIGNAL;
> +        MpHandOff->WaitLoopExecutionMode = sizeof (VOID *);
> +      }
> +    }
> +
> +    MpHandOff->Info[Index-HobBase].ApicId = CpuInfoInHob[Index].ApicId;
> +    MpHandOff->Info[Index-HobBase].Health = CpuInfoInHob[Index].Health;
>      if (CpuMpData->ApLoopMode != ApInHltLoop) {
> -      MpHandOff->Info[Index].StartupSignalAddress    = (UINT64)(UINTN)CpuMpData->CpuData[Index].StartupApSignal;
> -      MpHandOff->Info[Index].StartupProcedureAddress = (UINT64)(UINTN)&CpuMpData->CpuData[Index].ApFunction;
> +      MpHandOff->Info[Index-HobBase].StartupSignalAddress    = (UINT64)(UINTN)CpuMpData->CpuData[Index].StartupApSignal;
> +      MpHandOff->Info[Index-HobBase].StartupProcedureAddress = (UINT64)(UINTN)&CpuMpData->CpuData[Index].ApFunction;
>      }
>    }
>  

Reviewed-by: Laszlo Ersek <lersek@redhat.com>



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