Re: [edk2-devel] [Patch V4 0/5] Eliminate the second INIT-SIPI-SIPI sequence

["Ni, Ray" <ray.ni@intel.com>]

Reviewed-by: Ray Ni <Ray.ni@intel.com>

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Yuanhao Xie
> Sent: Wednesday, June 28, 2023 4:47 PM
> To: devel@edk2.groups.io
> Subject: [edk2-devel] [Patch V4 0/5] Eliminate the second INIT-SIPI-SIPI
> sequence
> 
> To speed up MP initialization, this set of patches replaces the
> time-consuming init-sipi-sipi process in the DXE phase. Instead,
> a start-up signal is used to wake up the APs and switch context
>  from the PEI phase to the DXE phase. This optimization is
>  effective when both PEI and DXE operate in the same bit mode.
> The current HOB characterized by mCpuInitMpLibHobGuid has
> two purposes:
>   Acting as a global variable for the PEI phase.
>   Transferring information from the PEI phase to the DXE phase.
> This series of patches creates a new HOB specifically designed
> to transfer only the minimal necessary information
> (MpHandoff structure) from the PEI phase to the DXE phase.
> 
> YuanhaoXie (5):
>   UefiCpuPkg: Refactor the logic for placing APs in HltLoop.
>   UefiCpuPkg: Refactor the logic for placing APs in Mwait/Runloop.
>   UefiCpuPkg: Create MpHandOff.
>   UefiCpuPkg: ApWakeupFunction directly use CpuMpData.
>   UefiCpuPkg: Eliminate the second INIT-SIPI-SIPI sequence.
> 
>  UefiCpuPkg/Library/MpInitLib/AmdSev.c          |  17 +++++++++++++++++
>  UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf  |   1 +
>  UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm |   4 ++--
>  UefiCpuPkg/Library/MpInitLib/MpHandOff.h       |  47
> +++++++++++++++++++++++++++++++++++++++++++++++
>  UefiCpuPkg/Library/MpInitLib/MpLib.c           | 345
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++++++++++++++++++++-----------------------------------------------------------------
>  UefiCpuPkg/Library/MpInitLib/MpLib.h           |  28
> ++++++++++++++++++++++++++++
>  UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf  |   2 +-
>  UefiCpuPkg/Library/MpInitLib/PeiMpLib.c        |  32
> +++++++++++++++++++++++++++++++-
>  UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm  |   3 +--
>  9 files changed, 408 insertions(+), 71 deletions(-)
>  create mode 100644 UefiCpuPkg/Library/MpInitLib/MpHandOff.h
> 
> --
> 2.36.1.windows.1
> 
> 
> 
> 
>