Following a power-up or RESET, since all APs are already in the
“wait-for-SIPI state,” the BSP can broadcast just a single SIPI IPI to
the APs to wake them up and initialize them.
Cc: Guo Dong <guo.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Sean Rhodes <sean@starlabs.systems>
Cc: James Lu <james...@intel.com>
Cc: Gua Guo <gua....@intel.com>
Signed-off-by: Yuanhao Xie <yuanhao....@intel.com>
---
UefiCpuPkg/Library/MpInitLib/MpLib.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c
b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index e5dc852ed9..a540b3fe3d 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -1233,7 +1233,14 @@ WakeUpAP (
if (CpuMpData->SevSnpIsEnabled && (CpuMpData->InitFlag != ApInitConfig))
{
SevSnpCreateAP (CpuMpData, -1);
} else {
- SendInitSipiSipiAllExcludingSelf ((UINT32)ExchangeInfo->BufferStart);
+ if (CpuMpData->InitFlag == ApInitConfig) {
+ //
+ // SIPI can be used for the first time wake up after reset to reduce
boot time.
+ //
+ SendStartupIpiAllExcludingSelf ((UINT32)ExchangeInfo->BufferStart);
+ } else {
+ SendInitSipiSipiAllExcludingSelf ((UINT32)ExchangeInfo->BufferStart);
+ }
}
}
--
2.36.1.windows.1
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