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UefiCpuPkg/MpInitLib: Reduce the size when loading microcode patches

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REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2429

This commit will attempt to reduce the copy size when loading the
microcode patches data from flash into memory.

Such optimization is done by a pre-process of the microcode patch headers
(on flash). A microcode patch will be loaded into memory only when the
below 3 criteria are met:

A. With a microcode patch header (which means the data is not padding data
   between microcode patches);
B. The 'ProcessorSignature' & 'ProcessorFlags' fields in the header match
   at least one processor within system;
C. If the Extended Signature Table exists in a microcode patch, the
   'ProcessorSignature' & 'ProcessorFlag' fields in the table entries
   match at least one processor within system.

Criterion B and C will require all the processors to be woken up once to
collect their CPUID and Platform ID information. Hence, this commit will
move the copy, detect and apply of microcode patch on BSP and APs after
all the processors have been woken up.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
This commit is contained in:
Hao A Wu
2019-12-19 14:33:44 +08:00
committed by mergify[bot]
parent 999463c865
commit d786a17232
3 changed files with 340 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
UefiCpuPkg/Library/MpInitLib/MpLib.h
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@@ -43,6 +43,20 @@
#define CPU_SWITCH_STATE_STORED 1
#define CPU_SWITCH_STATE_LOADED 2
//
// Default maximum number of entries to store the microcode patches information
//
#define DEFAULT_MAX_MICROCODE_PATCH_NUM 8
//
// Data structure for microcode patch information
//
typedef struct {
UINTN Address;
UINTN Size;
UINTN AlignedSize;
} MICROCODE_PATCH_INFO;
//
// CPU exchange information for switch BSP
//
@@ -575,6 +589,16 @@ MicrocodeDetect (
IN BOOLEAN IsBspCallIn
);
/**
Load the required microcode patches data into memory.
@param[in, out] CpuMpData The pointer to CPU MP Data structure.
**/
VOID
LoadMicrocodePatch (
IN OUT CPU_MP_DATA *CpuMpData
);
/**
Detect whether Mwait-monitor feature is supported.