In fact, the failure case is like below.
GetWakeupBuffer() could find < 1M range, but it will always fail with the check
in CheckOverlapWithAllocatedBuffer() when there is a memory allocation hob for
a range like base 0xff00000000 with size 0x10000000, the high bits 'ff' in base
0xff00000000 will be truncated when UINTN = UINT32.
The code change is good to me, Reviewed-by: Star Zeng <star.z...@intel.com>
How about updating the commit log? :)
Thanks,
Star
-----Original Message-----
From: Ni, Ruiyu
Sent: Monday, January 22, 2018 5:17 PM
To: edk2-devel@lists.01.org
Cc: Dong, Eric <eric.d...@intel.com>; Zeng, Star <star.z...@intel.com>
Subject: [PATCH] UefiCpuPkg/PeiMpLib: Fix a system hang-in-pei issue.
When HOB contains a system memory resource which is above 4GB, the (UINTN)
typecast truncates the high-32 bits.
It causes a memory range above 4GB be used by CpuMpPei code as the waking up
buffer.
The patch fixes this issue by using UINT64 type.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu...@intel.com>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Star Zeng <star.z...@intel.com>
---
UefiCpuPkg/Library/MpInitLib/PeiMpLib.c | 23 +++++++++++------------
1 file changed, 11 insertions(+), 12 deletions(-)
diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
index ad43bd33f5..791ae9db6e 100644
--- a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
@@ -1,7 +1,7 @@
/** @file
MP initialize support functions for PEI phase.
- Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2016 - 2018, Intel Corporation. All rights
+ reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD
License
which accompanies this distribution. The full text of the license may be
found at @@ -75,15 +75,15 @@ SaveCpuMpData ( **/ BOOLEAN
CheckOverlapWithAllocatedBuffer (
- IN UINTN WakeupBufferStart,
- IN UINTN WakeupBufferEnd
+ IN UINT64 WakeupBufferStart,
+ IN UINT64 WakeupBufferEnd
)
{
EFI_PEI_HOB_POINTERS Hob;
EFI_HOB_MEMORY_ALLOCATION *MemoryHob;
BOOLEAN Overlapped;
- UINTN MemoryStart;
- UINTN MemoryEnd;
+ UINT64 MemoryStart;
+ UINT64 MemoryEnd;
Overlapped = FALSE;
//
@@ -96,9 +96,8 @@ CheckOverlapWithAllocatedBuffer (
while (!END_OF_HOB_LIST (Hob)) {
if (Hob.Header->HobType == EFI_HOB_TYPE_MEMORY_ALLOCATION) {
MemoryHob = Hob.MemoryAllocation;
- MemoryStart = (UINTN) MemoryHob->AllocDescriptor.MemoryBaseAddress;
- MemoryEnd = (UINTN) (MemoryHob->AllocDescriptor.MemoryBaseAddress +
- MemoryHob->AllocDescriptor.MemoryLength);
+ MemoryStart = MemoryHob->AllocDescriptor.MemoryBaseAddress;
+ MemoryEnd = MemoryHob->AllocDescriptor.MemoryBaseAddress +
MemoryHob->AllocDescriptor.MemoryLength;
if (!((WakeupBufferStart >= MemoryEnd) || (WakeupBufferEnd <=
MemoryStart))) {
Overlapped = TRUE;
break;
@@ -123,8 +122,8 @@ GetWakeupBuffer (
)
{
EFI_PEI_HOB_POINTERS Hob;
- UINTN WakeupBufferStart;
- UINTN WakeupBufferEnd;
+ UINT64 WakeupBufferStart;
+ UINT64 WakeupBufferEnd;
WakeupBufferSize = (WakeupBufferSize + SIZE_4KB - 1) & ~(SIZE_4KB - 1);
@@ -149,7 +148,7 @@ GetWakeupBuffer (
//
// Need memory under 1MB to be collected here
//
- WakeupBufferEnd = (UINTN) (Hob.ResourceDescriptor->PhysicalStart +
Hob.ResourceDescriptor->ResourceLength);
+ WakeupBufferEnd = Hob.ResourceDescriptor->PhysicalStart +
+ Hob.ResourceDescriptor->ResourceLength;
if (WakeupBufferEnd > BASE_1MB) {
//
// Wakeup buffer should be under 1MB @@ -174,7 +173,7 @@
GetWakeupBuffer (
}
DEBUG ((DEBUG_INFO, "WakeupBufferStart = %x, WakeupBufferSize =
%x\n",
WakeupBufferStart, WakeupBufferSize));
- return WakeupBufferStart;
+ return (UINTN)WakeupBufferStart;
}
}
}
--
2.15.1.windows.2
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