Re: [edk2-devel] [Patch v3 6/6] UefiCpuPkg/RegisterCpuFeaturesLib: Start all processors simultaneously.

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

On 07/24/19 09:07, Dong, Eric wrote:
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1973
> 
> For semaphore type register, it required all processors to do the
> task at the same time.
> Current logic begins BSP's task after all APs have finished their tasks.
> This will caused set semaphore task hang if semaphore has package
> level type.
> This patch use new EDKII_PEI_MP_SERVICES2_PPI to start all processors at
> the same time to fix the potential hang issue.
> 
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Chandana Kumar <chandana.c.kumar@intel.com>
> Cc: Star Zeng <star.zeng@intel.com>
> Signed-off-by: Eric Dong <eric.dong@intel.com>
> ---
>  .../CpuFeaturesInitialize.c                   |  2 +-
>  .../DxeRegisterCpuFeaturesLib.c               |  6 +-
>  .../PeiRegisterCpuFeaturesLib.c               | 66 ++++++++++++++-----
>  .../PeiRegisterCpuFeaturesLib.inf             |  1 +
>  .../RegisterCpuFeatures.h                     |  2 +-
>  5 files changed, 54 insertions(+), 23 deletions(-)

My testing did not cover this patch.

Thanks
Laszlo