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audk/UefiCpuPkg/Library/MpInitLib
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Hao A Wu 348a34d984 UefiCpuPkg/MpInitLib: Not pass microcode info between archs in CPU_MP_DATA 
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2465

Commit 89164babec:
UefiCpuPkg/MpInitLib: don't shadow the microcode patch twice.

attempted to use 'MicrocodePatchRegionSize' and 'MicrocodePatchAddress'
fields to avoid loading the microcode patches data into memory again in
the DXE phase.

However, the CPU_MP_DATA structure has members with type 'UINTN' or
pointer before the microcode patch related fields. This may cause issues
when PEI and DXE are of different archs (e.g. PEI - IA32, DXE - x64),
since the microcode patch related fields will have different offsets in
the CPU_MP_DATA structure.

Commit 88bd066166:
UefiCpuPkg/MpInitLib: Relocate microcode patch fields in CPU_MP_DATA

tried to resolve the above-mentioned issue by relocating the fields
'MicrocodePatchRegionSize' and 'MicrocodePatchAddress' before members with
different size between different archs. But it failed to take the case of
pre-built binaries (e.g. FSP) into consideration.

Binaries can be built when the code base had a different version of the
CPU_MP_DATA structure definition. This may cause issues when accessing
these microcode patch related fields, since their offsets are different
(between PEI phase in the binaries and DXE phase in current code
implementation).

This commit will use the newly introduced EDKII microcode patch HOB
instead for the DXE phase to get the information of the loaded microcode
patches data done in the PEI phase. And the 'MicrocodePatchRegionSize' and
'MicrocodePatchAddress' fields in CPU_MP_DATA will not be used to pass
information between phases.

For pre-built binaries, they can be classified into 3 types with regard to
the time when they are being built:

A. Before commit 89164babec
   (In other words, 'MicrocodePatchRegionSize' and 'MicrocodePatchAddress'
    were not being used to skip microcode load in DXE)

For this case, the EDKII microcode patch HOB will not be produced. This
commit will load the microcode patches data again in DXE. Such behavior is
the same with the code base back then.

B. After commit 89164babec, before commit e1ed55738e
   (In other words, 'MicrocodePatchRegionSize' and 'MicrocodePatchAddress'
    being used to skip microcode load in DXE, but failed to work properly
    between differnt archs.)

For this case, the EDKII microcode patch HOB will not be produced as well.
This commit will also load the microcode patches data again in DXE.

But since commit 89164babec failed to keep the detection and application
of microcode patches working properly in DXE after skipping the load, we
fall back to the origin behavior (that is to load the microcode patches
data again in DXE).

C. After commit e1ed55738e
   (In other words, EDKII microcode patch HOB will be produced.)

For this case, it will have the same behavior with the BIOS built from
the current source codes.

Cc: Michael Kubacki <michael.a.kubacki@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Hao A Wu <hao.a.wu@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
 		2020-02-11 03:50:54 +00:00
..
Ia32 UefiCpuPkg/MpInitLib: increase NumApsExecuting only for ApInitConfig 2019-06-10 10:53:42 +08:00
X64 UefiCpuPkg/MpInitLib: Enable 5-level paging for AP when BSP's enabled 2019-08-09 08:52:08 +08:00
DxeMpInitLib.inf UefiCpuPkg/MpInitLib: Not pass microcode info between archs in CPU_MP_DATA 2020-02-11 03:50:54 +00:00
DxeMpInitLib.uni UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
DxeMpLib.c UefiCpuPkg/MpInitLib: Add MpInitLibStartupAllCPUs API. 2019-07-29 09:25:20 +08:00
Microcode.c UefiCpuPkg/MpInitLib: Not pass microcode info between archs in CPU_MP_DATA 2020-02-11 03:50:54 +00:00
MpLib.c UefiCpuPkg/MpInitLib: Not pass microcode info between archs in CPU_MP_DATA 2020-02-11 03:50:54 +00:00
MpLib.h UefiCpuPkg/MpInitLib: Not pass microcode info between archs in CPU_MP_DATA 2020-02-11 03:50:54 +00:00
PeiMpInitLib.inf UefiCpuPkg: Shadow microcode patch according to FIT microcode entry. 2020-01-10 06:20:42 +00:00
PeiMpInitLib.uni UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00
PeiMpLib.c UefiCpuPkg/MpInitLib: Not pass microcode info between archs in CPU_MP_DATA 2020-02-11 03:50:54 +00:00