Re: [edk2-devel] [PATCH 0/6] Fix race condition and add event protocol

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

On 05/24/19 07:04, Gao, Zhichao wrote:
> There is a race condition in CoreWaitForEvent function:
> If an interrupt happens between CheckEvent and gIdleLoopEvent,
> there would be a event pending during cpu sleep. 
> So it is required to check the gEventPending with the interrupt
> disabled.
> Implement a gEfiCpu2ProtocolGuid to fix that. The protocol include
> one interface to enable interrupt and put the cpu to sleep.
> 
> Add a event protocol gEdkiiCommonEventProtocolGuid to support
> all TPL event. It is require for PI drivers that use HW interrput.
> 
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Hao A Wu <hao.a.wu@intel.com>
> cc: Ray Ni <ray.ni@intel.com>
> Cc: Star Zeng <star.zeng@intel.com>
> Cc: Liming gao <liming.gao@intel.com>
> Cc: Sean Brogan <sean.brogan@microsoft.com>
> Cc: Michael Turner <Michael.Turner@microsoft.com>
> Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>

Thanks for the CC; I'll let others review this series.

Thanks
Laszlo

> Sean Brogan (5):
>   MdeModulePkg: Add gEdkiiCommonEventProtocolGuid for event
>   MdePkg/BaseLib.h: Add EnableInterruptsAndSleep function declare
>   MdePkg/BaseLib: Implement EnableInterruptsAndSleep
>   MdePkg: Add gEfiCpu2ProtocolGuid and header file
>   MdeModulePkg/DxeMain: Implement common event protocol
> 
> Zhichao Gao (1):
>   UefiCpuPkg/CpuDxe: Implement Cpu2 protocol
> 
>  MdeModulePkg/Core/Dxe/DxeMain.h               |  64 ++++++++++-
>  MdeModulePkg/Core/Dxe/DxeMain.inf             |   1 +
>  MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c       |  22 ++++
>  .../Core/Dxe/DxeMain/DxeProtocolNotify.c      |   1 +
>  MdeModulePkg/Core/Dxe/Event/Event.c           | 102 ++++++++++++++++--
>  MdeModulePkg/Core/Dxe/Event/Event.h           |   2 +-
>  MdeModulePkg/Include/Protocol/CommonEvent.h   |  18 ++++
>  MdeModulePkg/MdeModulePkg.dec                 |   3 +
>  MdePkg/Include/Library/BaseLib.h              |  11 ++
>  MdePkg/Include/Protocol/Cpu2.h                |  43 ++++++++
>  .../Library/BaseLib/Ia32/EnableInterrupts.c   |  18 +++-
>  .../BaseLib/Ia32/EnableInterrupts.nasm        |  15 ++-
>  .../Library/BaseLib/X64/EnableInterrupts.nasm |  15 ++-
>  MdePkg/MdePkg.dec                             |   3 +
>  UefiCpuPkg/CpuDxe/CpuDxe.c                    |  40 ++++++-
>  UefiCpuPkg/CpuDxe/CpuDxe.h                    |  15 +++
>  UefiCpuPkg/CpuDxe/CpuDxe.inf                  |   3 +-
>  17 files changed, 358 insertions(+), 18 deletions(-)
>  create mode 100644 MdeModulePkg/Include/Protocol/CommonEvent.h
>  create mode 100644 MdePkg/Include/Protocol/Cpu2.h
>