From 66833b2a87d98be8d81d1337c193bcbf0de47d47 Mon Sep 17 00:00:00 2001 From: Jian J Wang Date: Wed, 24 Jan 2018 09:36:01 +0800 Subject: [PATCH] UefiCpuPkg/MpInitLib: fix issue in wakeup buffer initialization To fix an issue in which enabling NX feature will mark the AP wakeup buffer as non-executable and fail the AP init, the buffer was split into two part: the lower part in memory within 1MB and the higher part within allocated executable memory (EfiBootServicesCode). But the address of higher part memory was stored in lower part memory, which is actually shared with legacy components and will be overwritten by LegacyBiosDxe driver if CSM is enabled. This patch fixes this issue by storing the address of higher part memory in CpuMpData instead of ExchangeInfo. Cc: Ruiyu Ni Cc: Eric Dong Cc: Laszlo Ersek Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jian J Wang Reviewed-by: Laszlo Ersek --- UefiCpuPkg/Library/MpInitLib/MpLib.c | 20 ++++++++++---------- UefiCpuPkg/Library/MpInitLib/MpLib.h | 1 + 2 files changed, 11 insertions(+), 10 deletions(-) diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c index 6231968c74..42011d6231 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c @@ -823,19 +823,20 @@ FillExchangeInfoData ( // Copy all 32-bit code and 64-bit code into memory with type of // EfiBootServicesCode to avoid page fault if NX memory protection is enabled. // - if (ExchangeInfo->ModeTransitionMemory != 0) { + if (CpuMpData->WakeupBufferHigh != 0) { Size = CpuMpData->AddressMap.RendezvousFunnelSize - CpuMpData->AddressMap.ModeTransitionOffset; CopyMem ( - (VOID *)(UINTN)ExchangeInfo->ModeTransitionMemory, + (VOID *)CpuMpData->WakeupBufferHigh, CpuMpData->AddressMap.RendezvousFunnelAddress + CpuMpData->AddressMap.ModeTransitionOffset, Size ); - ExchangeInfo->ModeHighMemory = ExchangeInfo->ModeTransitionMemory; - ExchangeInfo->ModeHighMemory += (UINT32)ExchangeInfo->ModeOffset - - (UINT32)CpuMpData->AddressMap.ModeTransitionOffset; + ExchangeInfo->ModeTransitionMemory = (UINT32)CpuMpData->WakeupBufferHigh; + ExchangeInfo->ModeHighMemory = (UINT32)CpuMpData->WakeupBufferHigh + + (UINT32)ExchangeInfo->ModeOffset - + (UINT32)CpuMpData->AddressMap.ModeTransitionOffset; ExchangeInfo->ModeHighSegment = (UINT16)ExchangeInfo->CodeSegment; } else { ExchangeInfo->ModeTransitionMemory = (UINT32) @@ -916,11 +917,10 @@ AllocateResetVector ( CpuMpData->WakeupBuffer = GetWakeupBuffer (ApResetVectorSize); CpuMpData->MpCpuExchangeInfo = (MP_CPU_EXCHANGE_INFO *) (UINTN) (CpuMpData->WakeupBuffer + CpuMpData->AddressMap.RendezvousFunnelSize); - CpuMpData->MpCpuExchangeInfo->ModeTransitionMemory = (UINT32) - GetModeTransitionBuffer ( - CpuMpData->AddressMap.RendezvousFunnelSize - - CpuMpData->AddressMap.ModeTransitionOffset - ); + CpuMpData->WakeupBufferHigh = GetModeTransitionBuffer ( + CpuMpData->AddressMap.RendezvousFunnelSize - + CpuMpData->AddressMap.ModeTransitionOffset + ); } BackupAndPrepareWakeupBuffer (CpuMpData); } diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h b/UefiCpuPkg/Library/MpInitLib/MpLib.h index 0232fe896a..e7f9a4de0a 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpLib.h +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h @@ -208,6 +208,7 @@ struct _CPU_MP_DATA { UINTN CpuApStackSize; MP_ASSEMBLY_ADDRESS_MAP AddressMap; UINTN WakeupBuffer; + UINTN WakeupBufferHigh; UINTN BackupBuffer; UINTN BackupBufferSize; -- 2.39.2