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From: "Dong, Eric" <eric.dong@intel.com>
To: devel@edk2.groups.io
Cc: "Ni, Ray" <ray.ni@intel.com>, Laszlo Ersek <lersek@redhat.com>
Subject: [Patch v5 2/9] UefiCpuPkg/MpInitLib: Enable 5-level paging for AP when BSP's enabled
Date: Thu,  8 Aug 2019 14:14:41 +0800	[thread overview]
Message-ID: <20190808061448.14684-3-eric.dong@intel.com> (raw)
In-Reply-To: <20190808061448.14684-1-eric.dong@intel.com>

From: "Ni, Ray" <ray.ni@intel.com>

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2008

MpInitLib is the library that's responsible to wake up APs to provide
MP PPI and Protocol services.

The patch synchronizes BSP's CR4.LA57 to each AP's CR4.LA57.
Without this change, AP may enter to GP fault when BSP's 5-level page
table is set to AP during AP wakes up.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Eric Dong <eric.dong@intel.com>
---
 UefiCpuPkg/Library/MpInitLib/MpLib.c          | 13 +++++++++++++
 UefiCpuPkg/Library/MpInitLib/MpLib.h          |  4 ++++
 UefiCpuPkg/Library/MpInitLib/X64/MpEqu.inc    |  3 ++-
 UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm | 14 +++++++++++++-
 4 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index a1ad665564..d6f84c6f45 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -790,6 +790,7 @@ FillExchangeInfoData (
   volatile MP_CPU_EXCHANGE_INFO    *ExchangeInfo;
   UINTN                            Size;
   IA32_SEGMENT_DESCRIPTOR          *Selector;
+  IA32_CR4                         Cr4;
 
   ExchangeInfo                  = CpuMpData->MpCpuExchangeInfo;
   ExchangeInfo->Lock            = 0;
@@ -814,6 +815,18 @@ FillExchangeInfoData (
 
   ExchangeInfo->InitializeFloatingPointUnitsAddress = (UINTN)InitializeFloatingPointUnits;
 
+  //
+  // We can check either CPUID(7).ECX[bit16] or check CR4.LA57[bit12]
+  //  to determin whether 5-Level Paging is enabled.
+  // CPUID(7).ECX[bit16] shows CPU's capability, CR4.LA57[bit12] shows
+  // current system setting.
+  // Using latter way is simpler because it also eliminates the needs to
+  //  check whether platform wants to enable it.
+  //
+  Cr4.UintN = AsmReadCr4 ();
+  ExchangeInfo->Enable5LevelPaging = (BOOLEAN) (Cr4.Bits.LA57 == 1);
+  DEBUG ((DEBUG_INFO, "%a: 5-Level Paging = %d\n", gEfiCallerBaseName, ExchangeInfo->Enable5LevelPaging));
+
   //
   // Get the BSP's data of GDT and IDT
   //
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h b/UefiCpuPkg/Library/MpInitLib/MpLib.h
index effa235778..4b12f91d47 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.h
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h
@@ -185,6 +185,10 @@ typedef struct {
   UINT16                ModeTransitionSegment;
   UINT32                ModeHighMemory;
   UINT16                ModeHighSegment;
+  //
+  // Enable5LevelPaging indicates whether 5-level paging is enabled in long mode.
+  //
+  BOOLEAN               Enable5LevelPaging;
 } MP_CPU_EXCHANGE_INFO;
 
 #pragma pack()
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpEqu.inc b/UefiCpuPkg/Library/MpInitLib/X64/MpEqu.inc
index 467f54a860..58ef369342 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpEqu.inc
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpEqu.inc
@@ -1,5 +1,5 @@
 ;------------------------------------------------------------------------------ ;
-; Copyright (c) 2015 - 2017, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR>
 ; SPDX-License-Identifier: BSD-2-Clause-Patent
 ;
 ; Module Name:
@@ -40,3 +40,4 @@ ModeTransitionMemoryLocation        equ  LockLocation + 94h
 ModeTransitionSegmentLocation       equ  LockLocation + 98h
 ModeHighMemoryLocation              equ  LockLocation + 9Ah
 ModeHighSegmentLocation             equ  LockLocation + 9Eh
+Enable5LevelPagingLocation          equ  LockLocation + 0A0h
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
index cea90f3d4d..87f2523e85 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
@@ -1,5 +1,5 @@
 ;------------------------------------------------------------------------------ ;
-; Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR>
 ; SPDX-License-Identifier: BSD-2-Clause-Patent
 ;
 ; Module Name:
@@ -100,6 +100,18 @@ SkipEnableExecuteDisableBit:
     ;
     mov        eax, cr4
     bts        eax, 5
+
+    mov        esi, Enable5LevelPagingLocation
+    cmp        byte [ebx + esi], 0
+    jz         SkipEnable5LevelPaging
+
+    ;
+    ; Enable 5 Level Paging
+    ;
+    bts        eax, 12                     ; Set LA57=1.
+
+SkipEnable5LevelPaging:
+
     mov        cr4, eax
 
     ;
-- 
2.21.0.windows.1


  parent reply	other threads:[~2019-08-08  6:14 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-08  6:14 [Patch v5 0/9] Support 5-level paging in DXE long mode Dong, Eric
2019-08-08  6:14 ` [Patch v5 1/9] OvmfPkg/PlatformPei: Change referenced MSR name Dong, Eric
2019-08-08  6:14 ` Dong, Eric [this message]
2019-08-08  6:14 ` [Patch v5 3/9] UefiCpuPkg/CpuDxe: Remove unnecessary macros Dong, Eric
2019-08-08  6:14 ` [Patch v5 4/9] UefiCpuPkg/CpuDxe: Support parsing 5-level page table Dong, Eric
2019-08-08  6:14 ` [Patch v5 5/9] MdeModulePkg/DxeIpl: Introduce PCD PcdUse5LevelPageTable Dong, Eric
2019-08-08  6:14 ` [Patch v5 6/9] MdePkg/Cpuid.h: Move Cpuid.h from UefiCpuPkg to MdePkg Dong, Eric
2019-08-08  6:14 ` [Patch v5 7/9] MdeModulePkg/DxeIpl: Create 5-level page table for long mode Dong, Eric
2019-08-08  6:14 ` [Patch v5 8/9] UefiCpuPkg|MdePkg: Move Register/ folder to MdePkg/Include/ Dong, Eric
2019-08-08  6:14 ` [Patch v5 9/9] UefiCpuPkg: Update code to include register definitions from MdePkg Dong, Eric

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