Re: [edk2-devel] [Patch V3 2/4] UefiCpuPkg: Add PcdFirstTimeWakeUpAPsBySipi

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

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

> -----Original Message-----
> From: Xie, Yuanhao <yuanhao.xie@intel.com>
> Sent: Thursday, July 20, 2023 3:08 PM
> To: devel@edk2.groups.io
> Cc: Dong, Guo <guo.dong@intel.com>; Ni, Ray <ray.ni@intel.com>; Rhodes, Sean
> <sean@starlabs.systems>; Lu, James <james.lu@intel.com>; Guo, Gua
> <gua.guo@intel.com>; Xie, Yuanhao <yuanhao.xie@intel.com>
> Subject: [Patch V3 2/4] UefiCpuPkg: Add PcdFirstTimeWakeUpAPsBySipi
> 
> Add PcdFirstTimeWakeUpAPsBySipi to check if it is in the OVMF environment
>  and necessary to wake up APs by INIT-SIPI-SIPI.
> 
> Cc: Guo Dong <guo.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Sean Rhodes <sean@starlabs.systems>
> Cc: James Lu <james.lu@intel.com>
> Cc: Gua Guo <gua.guo@intel.com>
> Signed-off-by: Yuanhao Xie <yuanhao.xie@intel.com>
> ---
>  UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf |  1 +
>  UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf |  1 +
>  UefiCpuPkg/UefiCpuPkg.dec                     | 11 +++++++++++
>  3 files changed, 13 insertions(+)
> 
> diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> index 7d45d3ad4d..55e46d4a1f 100644
> --- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> +++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
> @@ -81,6 +81,7 @@
>    gUefiCpuPkgTokenSpaceGuid.PcdCpuApStatusCheckIntervalInMicroSeconds  ##
> CONSUMES
>    gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures                  ##
> CONSUMES
>    gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase                       ##
> SOMETIMES_CONSUMES
> +  gUefiCpuPkgTokenSpaceGuid.PcdFirstTimeWakeUpAPsBySipi                ##
> CONSUMES
>    gEfiMdeModulePkgTokenSpaceGuid.PcdCpuStackGuard                      ##
> CONSUMES
>    gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase                           ## CONSUMES
>    gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr           ##
> CONSUMES
> diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> b/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> index 83e9028d0f..bc3d716aa9 100644
> --- a/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> +++ b/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
> @@ -66,6 +66,7 @@
>    gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate                   ##
> SOMETIMES_CONSUMES
>    gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase                   ##
> SOMETIMES_CONSUMES
>    gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures              ##
> CONSUMES
> +  gUefiCpuPkgTokenSpaceGuid.PcdFirstTimeWakeUpAPsBySipi             ##
> CONSUMES
>    gEfiMdeModulePkgTokenSpaceGuid.PcdGhcbBase                       ## CONSUMES
>    gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr       ##
> CONSUMES
> 
> diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> index e7726a605c..cef0cbd43b 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dec
> +++ b/UefiCpuPkg/UefiCpuPkg.dec
> @@ -214,6 +214,17 @@
>    # @Prompt Configure the SEV-ES work area base
> 
> gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaSize|0x0|UINT32|0x30002006
> 
> +  ## INIT is now triggered before BIOS by ucode/hardware. In the OVMF
> +  # environment, QEMU lacks a simulation for the INIT process.
> +  # To address this, PcdFirstTimeWakeUpAPsBySipi is to indicate
> +  # whether to broadcast INIT-SIPI-SIPI or SIPI.
> +  #
> +  #   TRUE  - Broadcast SIPI in the OVMF environment.
> +  #   FALSE - Broadcast INIT-SIPI-SIPI.
> +  #
> +  # @Prompt Ovmf environement Check.
> +
> gUefiCpuPkgTokenSpaceGuid.PcdFirstTimeWakeUpAPsBySipi|TRUE|BOOLEAN|0
> x30002007
> +
>  [PcdsFixedAtBuild, PcdsPatchableInModule]
>    ## This value is the CPU Local APIC base address, which aligns the address on a
> 4-KByte boundary.
>    # @Prompt Configure base address of CPU Local APIC
> --
> 2.36.1.windows.1



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