Re: [edk2-devel] [PATCH 1/5] UefiCpuPkg: Create MpHandOff to transfer info from PEI to DXE.

["Gerd Hoffmann" <kraxel@redhat.com>]

  Hi,

> +typedef struct {
> +  UINT32    ApicId;
> +  UINT32    Health;
> +  UINT64    StartupSignalAddress;
> +  UINT64    StartupProcedureAddress;
> +} PROCESSOR_HAND_OFF;
> +
> +typedef struct {
> +  //
> +  // The ProcessorIndex indicates the range of processors. If it is set to 0, it signifies
> +  // processors from 0 to CpuCount - 1. Multiple instances in the HOB list describe
> +  // processors from ProcessorIndex to ProcessorIndex + CpuCount - 1.
> +  //
> +  UINT32                ProcessorIndex;
> +  UINT32                CpuCount;
> +  UINT32                WaitLoopExecutionMode;
> +  UINT32                StartupSignalValue;
> +  PROCESSOR_HAND_OFF    Info[];
> +} MP_HAND_OFF;

This works for ~2700 processors, with larger numbers you hit the
hob size limit.  Not a good idea IMHO, we already have systems
that big.

take care,
  Gerd