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 <kra...@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 <ler...@redhat.com>
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