Borrow the space below 1MB for AP reset vector

[edk2] [PATCH 0/2] Borrow the space below 1MB for AP reset vector

Posted by Jeff Fan 6 years, 12 months ago

Current, CpuMpPei will find the available memory space below 1MB for AP reset
vector. And CpuMpPei will build resource HOB on this range to prevent other
PEI modules to use this range.

However, on some FSP usage model, this range maybe used by the code out of FSP.
CpuMpPei may change the original memory contents and cause other code crash.

We could update CpuMpPei not to change the original contents of this range
around AP waking up. Thus, it will not impact the other code on FSP usage model.

This updating is tiny and less impact on performance.

https://bugzilla.tianocore.org/show_bug.cgi?id=500

Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>

Jeff Fan (2):
  UefiCpuPkg/MpInitLib: save/restore original contents
  UefiCpuPkg/MpInitLib: needn't to allocate AP reset vector

 UefiCpuPkg/Library/MpInitLib/MpLib.h          |  22 +-----
 UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf |   6 +-
 UefiCpuPkg/Library/MpInitLib/PeiMpLib.c       | 107 +-------------------------
 3 files changed, 5 insertions(+), 130 deletions(-)

-- 
2.9.3.windows.2

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Re: [edk2] [PATCH 0/2] Borrow the space below 1MB for AP reset vector

Posted by Tian, Feng 6 years, 11 months ago

Reviewed-by: Feng Tian <feng.tian@Intel.com>

Thanks
Feng

-----Original Message-----
From: Fan, Jeff 
Sent: Friday, April 21, 2017 2:04 PM
To: edk2-devel@lists.01.org
Cc: Tian, Feng <feng.tian@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: [PATCH 0/2] Borrow the space below 1MB for AP reset vector

Current, CpuMpPei will find the available memory space below 1MB for AP reset vector. And CpuMpPei will build resource HOB on this range to prevent other PEI modules to use this range.

However, on some FSP usage model, this range maybe used by the code out of FSP.
CpuMpPei may change the original memory contents and cause other code crash.

We could update CpuMpPei not to change the original contents of this range around AP waking up. Thus, it will not impact the other code on FSP usage model.

This updating is tiny and less impact on performance.

https://bugzilla.tianocore.org/show_bug.cgi?id=500

Cc: Feng Tian <feng.tian@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>

Jeff Fan (2):
  UefiCpuPkg/MpInitLib: save/restore original contents
  UefiCpuPkg/MpInitLib: needn't to allocate AP reset vector

 UefiCpuPkg/Library/MpInitLib/MpLib.h          |  22 +-----
 UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf |   6 +-
 UefiCpuPkg/Library/MpInitLib/PeiMpLib.c       | 107 +-------------------------
 3 files changed, 5 insertions(+), 130 deletions(-)

--
2.9.3.windows.2

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