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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,ray.ni@intel.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: X-Gm-Message-State: 8Av2SmAKcXHdCyRxP5C8Tcgtx7686176AA= Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-GND-Status: LEGIT Authentication-Results: spool.mail.gandi.net; dkim=pass header.d=groups.io header.s=20140610 header.b=HBU3JWCl; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}"); dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=intel.com (policy=none); spf=pass (spool.mail.gandi.net: domain of bounce@groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce@groups.io Reviewed-by: Ray Ni > -----Original Message----- > From: Xie, Yuanhao > Sent: Thursday, July 20, 2023 3:08 PM > To: devel@edk2.groups.io > Cc: Dong, Guo ; Ni, Ray ; Rhodes, S= ean > ; Lu, James ; Guo, Gua > ; Xie, Yuanhao > Subject: [Patch V3 4/4] UefiCpuPkg:Wake up APs after power-up or RESET > through SIPI. >=20 > The implementation of this new behavior aligns with the guidelines > outlined in the Intel SDM. >=20 > Following a power-up or RESET of an MP system, system hardware > dynamically selects one of the processors on the system bus as the BSP. > The remaining processors are designated as APs. The APs complete a > minimal self-configuration, then wait for a startup signal (a SIPI > message) from the BSP processor. >=20 > Additionally, the MP protocol is executed only after > a power-up or RESET. If the MP protocol has completed and a > BSP is chosen, subsequent INITs (either to a specific processor or > system wide) do not cause the MP protocol to be repeated. Instead, each > logical processor examines its BSP flag (in the IA32_APIC_BASE MSR) to > determine whether it should execute the BIOS boot-strap code (if it is > the BSP) or enter a wait-for-SIPI state (if it is an AP). >=20 > Cc: Guo Dong > Cc: Ray Ni > Cc: Sean Rhodes > Cc: James Lu > Cc: Gua Guo > Signed-off-by: Yuanhao Xie > --- > UefiCpuPkg/Library/MpInitLib/MpLib.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) >=20 > diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c > b/UefiCpuPkg/Library/MpInitLib/MpLib.c > index 737e03ffc5..ce94937e30 100644 > --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c > +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c > @@ -1294,7 +1294,14 @@ WakeUpAP ( > if (CpuMpData->SevSnpIsEnabled && (CpuMpData->InitFlag !=3D ApInit= Config)) > { > SevSnpCreateAP (CpuMpData, -1); > } else { > - SendInitSipiSipiAllExcludingSelf ((UINT32)ExchangeInfo->BufferSt= art); > + if ((CpuMpData->InitFlag =3D=3D ApInitConfig) && FixedPcdGetBool > (PcdFirstTimeWakeUpAPsBySipi)) { > + // > + // SIPI can be used for the first time wake up after reset to = reduce boot > time. > + // > + SendStartupIpiAllExcludingSelf ((UINT32)ExchangeInfo->BufferSt= art); > + } else { > + SendInitSipiSipiAllExcludingSelf ((UINT32)ExchangeInfo->Buffer= Start); > + } > } > } >=20 > -- > 2.36.1.windows.1 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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